1 | /**
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2 | *#########################################################################
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3 | * BrowseDisplay.java - part of the demo-client for Greenstone 3, of the
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4 | * Greenstone digital library suite from the New Zealand Digital Library
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5 | * Project at the * University of Waikato, New Zealand.
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6 | * <BR><BR>
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7 | * Copyright (C) 2008 New Zealand Digital Library Project
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8 | * <BR><BR>
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9 | * This program is free software; you can redistribute it and/or modify
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10 | * it under the terms of the GNU General Public License as published by
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11 | * the Free Software Foundation; either version 2 of the License, or
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12 | * (at your option) any later version.
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13 | * <BR><BR>
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14 | * This program is distributed in the hope that it will be useful,
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15 | * but WITHOUT ANY WARRANTY; without even the implied warranty of
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16 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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17 | * GNU General Public License for more details.
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18 | *########################################################################
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19 | */
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20 | package org.greenstone.gs3client;
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21 |
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22 | import javax.swing.JPopupMenu;
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23 | import javax.swing.JList;
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24 | import javax.swing.JPanel;
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25 | import javax.swing.JScrollPane;
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26 | import javax.swing.JEditorPane;
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27 | import javax.swing.BorderFactory;
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28 | import javax.swing.JButton;
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29 | import javax.swing.JSplitPane;
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30 | import javax.swing.JLabel;
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31 |
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32 | import java.awt.event.ActionListener;
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33 | import java.awt.event.ActionEvent;
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34 |
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35 | import java.awt.Component;
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36 | import java.awt.Container;
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37 | import java.awt.Cursor;
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38 | import java.awt.Dimension;
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39 | import java.awt.BorderLayout;
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40 |
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41 | import org.w3c.dom.Element;
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42 | import org.w3c.dom.NodeList;
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43 |
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44 | import java.net.MalformedURLException;
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45 | import java.net.URL;
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46 | import java.util.Vector;
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47 | import java.util.HashMap;
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48 |
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49 | import javax.swing.JTree;
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50 | import javax.swing.text.html.HTMLDocument;
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51 | import javax.swing.tree.DefaultMutableTreeNode;
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52 | import javax.swing.tree.TreeSelectionModel;
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53 | import javax.swing.tree.DefaultTreeModel;
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54 | import javax.swing.event.TreeWillExpandListener;
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55 | import javax.swing.event.TreeExpansionEvent;
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56 | import javax.swing.event.TreeSelectionEvent;
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57 | import javax.swing.event.TreeSelectionListener;
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58 |
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59 | import org.apache.log4j.Logger;
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60 | import org.greenstone.gs3client.data.BrowseResponseData;
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61 | import org.greenstone.gs3client.data.DocumentNodeData;
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62 | import org.greenstone.gs3client.data.ClassifierNodeData;
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63 | import org.greenstone.gs3client.data.NodeData;
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64 | import org.greenstone.gs3client.data.ParseUtil;
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65 | import org.greenstone.gsdl3.util.GSXML;
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66 |
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67 | /**
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68 | * The Browse panel inside the Java-client's tab pane that's labelled "Browse".
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69 | * This panel contains a tree view for expanding classifiers and their documents.
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70 | * It also contains an area where the metadata is displayed, and a text area where
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71 | * the textual or image content of a selected documentNode is displayed.
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72 | * @author ak19
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73 | */
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74 | public class BrowseDisplay extends JPanel
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75 | implements TreeSelectionListener, TreeWillExpandListener,
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76 | ColourCombo.ColourChangeable
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77 | {
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78 | /** The Logger for this class */
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79 | static Logger LOG = Logger.getLogger(SearchResultsDisplay.class);
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80 |
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81 | /** Access to the running instance of GS3JavaClient */
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82 | protected GS3JavaClient client;
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83 | /** A HashMap to store the displayData for the Browse operation. Usually
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84 | * just 2 elements long at most: displayName and displayDescription. */
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85 | protected HashMap displayData;
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86 |
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87 | /* GUI items of this Browse Panel */
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88 | protected JLabel browseLabel;
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89 | protected JPanel browsePanel;
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90 | protected JSplitPane splitViewPane, structureMetaView;
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91 | protected JPanel browseBar;
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92 | protected ClassifierButton[] classifierList;
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93 | protected JTree browsingTree;
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94 | protected JEditorPane htmlPane;
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95 | protected JList metanames, metavalues;
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96 | /** Context menu that pops up when users right click in the browse tree area */
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97 | protected JPopupMenu popup;
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98 |
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99 | /** Constructor that creates the Browse Panel and its internal GUI items.
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100 | * @param client is the running instance of the client application through
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101 | * which its methods can be accessed. */
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102 | public BrowseDisplay(GS3JavaClient client) {
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103 | super(new BorderLayout());
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104 | this.client = client;
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105 | displayData = new HashMap(2); //usual maxsize
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106 |
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107 | browseBar = new JPanel(); // default FlowLayout L to R, centre aligned
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108 | classifierList = null;
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109 | this.add(browseBar, BorderLayout.NORTH);
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110 |
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111 | browsingTree = new JTree(new DefaultMutableTreeNode(null));
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112 | browsingTree.getSelectionModel().setSelectionMode(
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113 | TreeSelectionModel.SINGLE_TREE_SELECTION);
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114 | browsingTree.addTreeSelectionListener(this);
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115 | browsingTree.addTreeWillExpandListener(this);
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116 |
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117 | browsePanel = new JPanel(new BorderLayout());
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118 | // new FlowLayout(FlowLayout.LEFT)); // don't use this,
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119 | // else view of tree is limited to the very minimum
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120 | browsePanel.add(new JScrollPane(browsingTree), BorderLayout.CENTER);
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121 | browseLabel = new JLabel("Browsing by...");
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122 | browsePanel.add(browseLabel, BorderLayout.NORTH);
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123 |
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124 | JPanel metadataPanel = new JPanel(new BorderLayout());
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125 | this.metanames = new JList();
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126 | this.metavalues = new JList();
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127 | metadataPanel.add(metanames, BorderLayout.WEST);
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128 | metadataPanel.add(metavalues, BorderLayout.CENTER);
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129 |
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130 | JPanel metaSuperPanel = new JPanel(new BorderLayout());
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131 | metaSuperPanel.add(new JLabel("Metadata"), BorderLayout.NORTH);
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132 | //metaSuperPanel.add(metadataPanel, BorderLayout.CENTER);
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133 | metaSuperPanel.add(
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134 | new JScrollPane(metadataPanel), BorderLayout.CENTER);
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135 |
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136 | structureMetaView = new JSplitPane(JSplitPane.VERTICAL_SPLIT);
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137 | structureMetaView.setTopComponent(browsePanel);
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138 | structureMetaView.setBottomComponent(new JScrollPane(metaSuperPanel));
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139 | structureMetaView.setOneTouchExpandable(true);
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140 |
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141 | htmlPane = new JEditorPane();
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142 | htmlPane.setEditable(false);
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143 | htmlPane.setContentType("text/html");
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144 |
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145 | // Add the docStructure and metadata panels next to each
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146 | // other within a split pane
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147 | splitViewPane = new JSplitPane(JSplitPane.HORIZONTAL_SPLIT);
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148 | splitViewPane.setLeftComponent(structureMetaView);
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149 | splitViewPane.setRightComponent(new JScrollPane(htmlPane));
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150 | splitViewPane.setOneTouchExpandable(true);
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151 |
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152 | this.add(splitViewPane, BorderLayout.CENTER);
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153 |
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154 |
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155 | // add a (rightclick) popup menu to the browsing tree
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156 | // (can only do this after tree and htmlPane have been instantiated):
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157 | popup = new JPopupMenu();
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158 | browsingTree.setComponentPopupMenu(popup);
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159 | browsingTree.addMouseListener(new Displays.PopupListener(
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160 | popup, browsingTree, client, this.htmlPane));
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161 | }
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162 |
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163 | /** Clears the service-specific buttons in the browseBar and the
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164 | * service-specific display-data. The rest of the GUI (split panes, panels)
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165 | * remain as they are. */
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166 | public void clear() {
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167 | // empty the docStructureTree's popup menu too
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168 | popup.removeAll();
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169 |
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170 | browseBar.removeAll();
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171 | displayData.clear();
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172 |
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173 | htmlPane.setText("");
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174 | // empty any classification/document metadata
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175 | final String[] empty = {};
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176 | BrowseDisplay.this.metanames.setListData(empty);
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177 | BrowseDisplay.this.metavalues.setListData(empty);
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178 | //metanames.removeAll(); // doesn't work
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179 | //metavalues.removeAll(); // doesn't work
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180 |
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181 | // empty the tree:
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182 | ((DefaultTreeModel)browsingTree.getModel()).setRoot(null);
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183 |
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184 | classifierList = null;
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185 | System.gc();
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186 |
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187 | this.validate();
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188 | }
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189 |
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190 | /** Changes the colour of the query form and its controls to the
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191 | * current colours set in class ColourCombo. Specified by
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192 | * the ColourCombo.ColourChangeable interface. */
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193 | public void changeUIColour() {
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194 | Component[] comps = { this, this.browseBar, this.browsePanel,
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195 | browsingTree, metanames, metavalues, popup };
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196 | ColourCombo.changeColor(comps);
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197 | // ensures that the "metadata" JLabel (not an instance variable)
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198 | // is coloured appropriately as well
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199 | ColourCombo.changeAncestorColor(metanames);
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200 |
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201 | }
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202 |
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203 | /** For some reason, the overriden getPreferredSize() is not
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204 | * called upon resize of this panel, so I am calling it manually
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205 | * whenever there's a call to paint this Panel. Painting will
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206 | * be done when the parent container is resized (and this panel
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207 | * made visible) anyway, so it might as well work out what size
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208 | * the interior panels will have on every resize.
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209 | * @param g is the Graphics object
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210 | * @see "JPanel's paint(Graphics g)"
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211 | */
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212 | public void paint(java.awt.Graphics g) {
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213 | super.paint(g); // let the usual JPanel paint event happen
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214 | this.getPreferredSize();
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215 | }
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216 |
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217 | // FIX ME: The following problem was 'fixed' by overriding paint:
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218 | // Strangely, this method is called only once! Even though it should
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219 | // always be called on resize as indeed happens correctly in
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220 | // SearchResultsDisplay.java.
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221 | // Reason might be because components are arranged differently in the
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222 | // JSplitPanes nested in this JPanel (they're arranged different from
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223 | // SearchResultsDisplay.java)
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224 | /** Overrode this method to resize the splitpanes within, upon resize.
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225 | * It calculates the size of this panel, as well as setting those of
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226 | * the splitpanes it contains based on the size of the parent container.
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227 | * @return the preferred dimensions of this JPanel. */
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228 | public Dimension getPreferredSize() {
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229 | Dimension size = this.getParent().getSize();
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230 | int x = (int)size.getWidth() / 3; // WHY DOES THIS NOT WORK?????
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231 | int y = (int)(size.getHeight() / 5 * 3); // WHY DOES THIS NOT WORK?????
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232 | structureMetaView.setDividerLocation(y); // 400
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233 | // structureMetaView.setDividerLocation(1.0); // as far down as
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234 | // possible to give more space to browse structure and less to meta
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235 | splitViewPane.setDividerLocation(x); // 300
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236 | splitViewPane.setPreferredSize(size);
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237 | //System.err.println("SIZE: " + this.getSize() + "y: " + y);
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238 | return size;
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239 | }
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240 |
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241 | /** Will clear previous browse service's classification options and widgets,
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242 | * and redisplay browse options as specified by the describe Response Message
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243 | * XML returned from the browse Service.
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244 | * @param describeRespMsgTag - the (Classifier)Browse Service's describe
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245 | * response message element, used to reset the classifier buttons in the
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246 | * browseBar of this panel. */
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247 | public void displayBrowseOptions(Element describeRespMsgTag){
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248 | this.clear();
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249 | // First set the displayItems
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250 | Element service = ParseUtil.getFirstDescElementCalled(
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251 | describeRespMsgTag, GSXML.SERVICE_ELEM);
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252 |
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253 | Vector displayItems = ParseUtil.getAllChildElementsCalled(
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254 | service, GSXML.DISPLAY_TEXT_ELEM);
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255 | if(displayItems != null) {
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256 | for(int i = 0; i < displayItems.size(); i++) {
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257 | Element e = (Element)displayItems.get(i);
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258 | if(!e.hasAttribute(GSXML.NAME_ATT))
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259 | continue;
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260 | // we are looking for <displayItem name="">value</displayItem>
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261 | String name = e.getAttribute(GSXML.NAME_ATT);
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262 | String value = ParseUtil.getBodyTextValue(e);
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263 | this.displayData.put(name, value);
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264 | }
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265 |
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266 | // get <displayItem name="description">descr</displayItem>
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267 | String descr = (String)displayData.get(
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268 | GSXML.DISPLAY_TEXT_DESCRIPTION);
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269 | if(descr != null)
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270 | this.setBorder(BorderFactory.createTitledBorder(descr));
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271 | }
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272 |
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273 | // Now, process all <classifier> items inside <classifierList>
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274 | NodeList nl = describeRespMsgTag.getElementsByTagName(
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275 | GSXML.CLASSIFIER_ELEM+GSXML.LIST_MODIFIER);
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276 | // There will be only one, as far as I can tell from the describe
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277 | // response returned from gs2mgppdemo's ClassifierBrowse service
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278 | if(nl.getLength() <= 0)
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279 | return; // nothing to do; but this should not happen
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280 | Element classifierListTag = (Element)nl.item(0);
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281 |
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282 | // now get the <classifier>s children from <classifierList>
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283 | nl = classifierListTag.getElementsByTagName(GSXML.CLASSIFIER_ELEM);
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284 | int size = nl.getLength();
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285 | if(size > 0)
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286 | classifierList = new ClassifierButton[size];
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287 |
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288 | for(int i = 0; i < size; i++) {
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289 | Element classifier = (Element)nl.item(i);
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290 | classifierList[i] = new ClassifierButton(
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291 | new ClassifierData(classifier));
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292 | this.browseBar.add(classifierList[i]);
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293 | }
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294 | }
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295 |
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296 | /** Called to populate the browsing tree with browse data. Only the
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297 | * data for the top-level classifier and its direct descendants are
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298 | * retrieved.
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299 | * @param browseResponseObj - stores the data of the response XML
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300 | * message returned by the (Classifier)Browse service.
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301 | * @param rootName - the title/name of the root classifier */
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302 | public void displayBrowseResults(
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303 | BrowseResponseData browseResponseObj, String rootName)
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304 | {
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305 | browsingTree.removeAll();
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306 | DefaultTreeModel model = (DefaultTreeModel)browsingTree.getModel();
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307 |
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308 | ClassifierNodeData rootClassNode
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309 | = browseResponseObj.getRootClassifier();
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310 | rootClassNode.setTitle(rootName);
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311 | DefaultMutableTreeNode newRoot
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312 | = new DefaultMutableTreeNode(rootClassNode);
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313 |
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314 | NodeData[] childNodes = rootClassNode.getChildren();
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315 | // First set their titles:
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316 | client.retrieveTitledStructureFor(rootClassNode);
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317 |
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318 | if(childNodes != null) {
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319 | for(int i = 0; i < childNodes.length; i++) {
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320 | DefaultMutableTreeNode child
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321 | = new DefaultMutableTreeNode(childNodes[i]);
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322 | newRoot.add(child);
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323 | if(childNodes[i].hasChildren)
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324 | child.add(new DefaultMutableTreeNode(null));
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325 | //browsingTree.setRootVisible(false); //No, because it
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326 | // has a root: the root classifierNode
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327 | }
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328 | model.setRoot(newRoot);
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329 | }
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330 | }
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331 |
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332 | /** This method of the TreeWillExpandListener interface is called when
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333 | * the user clicked on an expandable node in the browsingTree.
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334 | * Since we are loading substructures in the tree lazily (i.e. loading
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335 | * childnodes lazily) we have dummy/null childTreeNodes that make
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336 | * expandable parentNodes look like folders (make the parents look
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337 | * expandable).
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338 | * Therefore, when the user clicks on an expandable node, we first check
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339 | * whether we already have loaded the datastructure/subtree or whether
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340 | * its child is a dummy (null). If a dummy (null child), then we work
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341 | * out whether it's a classifierNodeData or a documentNodeData that the
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342 | * expanding treeNode represents. Based on that, we retrieve the sub-
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343 | * structure for the treeNode that's expanding.
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344 | */
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345 | public void treeWillExpand(TreeExpansionEvent e)
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346 | {
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347 | DefaultMutableTreeNode node = null;
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348 |
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349 | // Don't use browsingTree.getLastSelectedPathComponent(). That
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350 | // method doesn't deal with the case when someone clicked on the
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351 | // expand/collapse knob next to folders.
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352 | // Use e.getPath().getLastPathComponent() instead:
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353 | node = (DefaultMutableTreeNode)e.getPath().getLastPathComponent();
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354 | if(node == null || node.isLeaf())
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355 | return; // leafnode, shouldn't happen: we're in Expansion method!
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356 |
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357 | Object nodeInfo = node.getUserObject();
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358 |
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359 | // First check whether this expanding/folder node's child contains
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360 | // a dummy object (null) or is already set:
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361 | DefaultMutableTreeNode child
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362 | = (DefaultMutableTreeNode)node.getFirstChild();
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363 | Object childNodeInfo = child.getUserObject();
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364 | // if the child is null (therefore not a NodeData object), it was a
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365 | // dummy we added for delayed lazy-loading - so remove child
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366 | if(childNodeInfo != null) {
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367 | return; // we've already retrieved the structure for
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368 | // this node, don't need to process it any further
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369 | }
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370 |
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371 | // Child is null: not a NodeData object, so we change the dummy child.
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372 | // This is done by populating the node's children with the actual
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373 | // document node/classifier node structure:
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374 | node.removeAllChildren(); // first remove the dummy child
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375 |
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376 | // now, construct the structure of the treenode that's expanding
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377 | // based on whether it represents a classifierNodeData or
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378 | // documentNodeData object:
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379 | NodeData nodeData = (NodeData)nodeInfo;
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380 | if(nodeData instanceof ClassifierNodeData) {
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381 | ClassifierNodeData classNode = (ClassifierNodeData)nodeData;
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382 | this.client.retrieveTitledStructureFor((classNode));
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383 |
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384 | // The above will have set the expanding classNode's children.
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385 | // Now, we add a treeNode for each child of classNode -
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386 | // and for each childclassNode that's expandable, add a dummy
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387 | // child for them to make them expandable:
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388 | NodeData[] children = classNode.getChildren();
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389 | for(int i = 0; i < children.length; i++) {
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390 | DefaultMutableTreeNode childTreeNode
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391 | = new DefaultMutableTreeNode(children[i]);
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392 | node.add(childTreeNode);
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393 | // If the classifier node has children (expands further), make
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394 | // it a folder by adding in a null child to allow lazy tree-
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395 | // expansion as when required
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396 | if(children[i].hasChildren)
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397 | childTreeNode.add(new DefaultMutableTreeNode(null));
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398 | }
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399 | } else { // if instanceof DocumentNodeData
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400 | DocumentNodeData docNode = (DocumentNodeData)nodeData;
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401 | if(docNode.nodeType.equals(GSXML.NODE_TYPE_ROOT)) {
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402 | this.client.retrieveTitledStructureFor(docNode);
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403 |
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404 | Displays.createNodesForChildren(docNode, node);
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405 | } //else { document can't be a leaf node *and* expand at the
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406 | // same time. So shouldn't ever be here!
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407 | // After all, this is the method that's called when a node
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408 | // is expanding, and leaf nodes should not expand.
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409 | //}
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410 | }
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411 | }
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412 |
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413 | /** Part of the TreeWillExpandListener interface. Nothing to do here. */
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414 | public void treeWillCollapse(TreeExpansionEvent e) {}
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415 |
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416 | /* THE FOLLOWING DOES NOT APPLY ANYMORE:
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417 | * In this method, we are not dealing with expandable nodes
|
---|
418 | * (we check for whether the clicked node is a leaf), but with document-
|
---|
419 | * NodeData objects that are leaves: for these, we display the document. */
|
---|
420 | /**
|
---|
421 | * Whenever an item is clicked in the browsingTree, this method is called.
|
---|
422 | * We display the document associated with a documentNode that is clicked,
|
---|
423 | * or "" for classifierNodes.
|
---|
424 | */
|
---|
425 | public void valueChanged(TreeSelectionEvent e) {
|
---|
426 | // remove any menuItems in the popup from the previously
|
---|
427 | // selected docNode
|
---|
428 | popup.removeAll();
|
---|
429 |
|
---|
430 | DefaultMutableTreeNode node = null;
|
---|
431 | node = (DefaultMutableTreeNode)
|
---|
432 | browsingTree.getLastSelectedPathComponent();
|
---|
433 |
|
---|
434 | if(node == null) return;
|
---|
435 | Object nodeInfo = node.getUserObject();
|
---|
436 | // after construction there's nothing in the trees, so check for that:
|
---|
437 | if(nodeInfo == null) return;
|
---|
438 |
|
---|
439 | // We need to change to a Wait cursor while we load the documentNode
|
---|
440 | Container c = client.getContentPane();
|
---|
441 | c.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
|
---|
442 |
|
---|
443 |
|
---|
444 | if(nodeInfo instanceof DocumentNodeData) {
|
---|
445 | //whether leaf or folder, the document element may contain text
|
---|
446 | DocumentNodeData docNode = (DocumentNodeData)nodeInfo;
|
---|
447 | client.retrieveContentFor(docNode);
|
---|
448 | // for docNodes, there's more than title metadata, so ensure
|
---|
449 | // all metadata has been retrieved
|
---|
450 | client.retrieveAllMetadataFor(docNode);
|
---|
451 |
|
---|
452 | if(docNode.hasNoText()) { //NoText field is 1, meaning it's an img
|
---|
453 | // now display the image
|
---|
454 | this.htmlPane.setText(
|
---|
455 | Displays.getImgUrlEnclosedInHtml(docNode.getImgURL()));
|
---|
456 | } else { // it has text
|
---|
457 | // Java's htmlpane does not recognise justified alignment.
|
---|
458 | // It displays them all centred.
|
---|
459 | // So here we replace all ALIGN="JUSTIFY" with ALIGN="LEFT"
|
---|
460 | // (we don't do this in the DocumentNodeData class itself,
|
---|
461 | // because our nodeContent should not be transformed: it will
|
---|
462 | // display properly in browsers and other html displays).
|
---|
463 | //System.err.println("docNode can not be an image");
|
---|
464 | String docContent = docNode.getContent().replaceAll(
|
---|
465 | "ALIGN=\"JUSTIFY\"", "ALIGN=\"LEFT\"");
|
---|
466 | String baseURL = client.getBaseURL();
|
---|
467 | // TODO: make the docNode itself work out its URL by passing
|
---|
468 | // baseURL to the docNode?
|
---|
469 | if(!baseURL.equals("") && docNode.getRoot() != null) {
|
---|
470 | // "" is the case where dlAPIA = gs3
|
---|
471 | // where the _httpdocimg_ macro will deal with
|
---|
472 | // resolving the relative urls into their full ones
|
---|
473 | // We don't want to set the base and meddle with macro
|
---|
474 | // for those cases.
|
---|
475 | // For Fedora's case:
|
---|
476 | HTMLDocument doc
|
---|
477 | = (HTMLDocument)this.htmlPane.getDocument();
|
---|
478 | try{
|
---|
479 | URL url = new URL(baseURL+docNode.getRoot().nodeID+"/");
|
---|
480 | //System.err.println("url: " + url.toString());
|
---|
481 | doc.setBase(url);
|
---|
482 | //docContent = docContent.replaceAll("_httpdocimg_/", "");
|
---|
483 | LOG.debug(docContent);
|
---|
484 | }catch(MalformedURLException mex) {
|
---|
485 | ; //nothing to be done, leave the base as it is
|
---|
486 | }
|
---|
487 | }
|
---|
488 | this.htmlPane.setText(docContent);
|
---|
489 | }
|
---|
490 | this.htmlPane.setCaretPosition(0);
|
---|
491 | } else // treenode is a ClassifierNodeData, clear the html Pane
|
---|
492 | this.htmlPane.setText("");
|
---|
493 |
|
---|
494 | // In any case -- whatever kind of nodedata it may be -- we display
|
---|
495 | // the metadata for this NodeData:
|
---|
496 | Displays.showMeta((NodeData)nodeInfo, metanames, metavalues);
|
---|
497 |
|
---|
498 | c.setCursor(Cursor.getDefaultCursor()); // set the cursor back to normal
|
---|
499 | }
|
---|
500 |
|
---|
501 | /** Inner class (not static, as it needs access to outerclass' this object.
|
---|
502 | * This class represents a button that encapsulates a ClassifierData
|
---|
503 | * object and sets its own name and tooltip text based on the displayName
|
---|
504 | * and displayDescription of that ClassifierData object. */
|
---|
505 | public class ClassifierButton
|
---|
506 | extends JButton implements ActionListener
|
---|
507 | {
|
---|
508 | /** Encapsulated classifierData obj */
|
---|
509 | public ClassifierData classifier;
|
---|
510 |
|
---|
511 | /** Constructor that creates a button to visually represent
|
---|
512 | * the classifier.
|
---|
513 | * @param classifier - the ClassifierData object for which to
|
---|
514 | * create a button, using its display data. */
|
---|
515 | public ClassifierButton(ClassifierData classifier) {
|
---|
516 | super(classifier.displayName);
|
---|
517 | this.classifier = classifier;
|
---|
518 | this.setToolTipText(classifier.displayDescription);
|
---|
519 | this.addActionListener(this);
|
---|
520 | }
|
---|
521 |
|
---|
522 | /** Called when someone presses the ClassifierButton: when pressed,
|
---|
523 | * perform the browse request associated with the classifier. */
|
---|
524 | public void actionPerformed(ActionEvent e) {
|
---|
525 | Container c = client.getContentPane();
|
---|
526 | c.setCursor(Cursor.getPredefinedCursor(Cursor.WAIT_CURSOR));
|
---|
527 | // empty the previous classification's/document's metadata
|
---|
528 | // and any text in the html pane
|
---|
529 | final String[] empty = {};
|
---|
530 | BrowseDisplay.this.metanames.setListData(empty);
|
---|
531 | BrowseDisplay.this.metavalues.setListData(empty);
|
---|
532 | BrowseDisplay.this.htmlPane.setText("");
|
---|
533 |
|
---|
534 | // Now use the outerclass' MessagerClient object to perform the
|
---|
535 | // browse request:
|
---|
536 | BrowseDisplay.this.client.doBrowse(this.classifier);
|
---|
537 | BrowseDisplay.this.browseLabel.setText("Browsing by "
|
---|
538 | + classifier.displayName);
|
---|
539 | c.setCursor(Cursor.getDefaultCursor());
|
---|
540 | }
|
---|
541 | }
|
---|
542 |
|
---|
543 | /** Static inner class that represents the data in a <classifier>
|
---|
544 | * element - itself nested inside a list (<classifierList>) of them.
|
---|
545 | * These elements are to be found in the response returned for a describe
|
---|
546 | * request sent to a collection's BrowseService. */
|
---|
547 | public static class ClassifierData {
|
---|
548 | /** The content attribute of the <classifier> */
|
---|
549 | public final String content;
|
---|
550 | /** The name attribute of the <classifier> */
|
---|
551 | public final String name;
|
---|
552 | /** The display name attribute of the <classifier> */
|
---|
553 | public final String displayName;
|
---|
554 | /** The description attribute of the <classifier> */
|
---|
555 | public final String displayDescription;
|
---|
556 |
|
---|
557 | /** Constructor.
|
---|
558 | * @param classifierTag - creates a ClassifierData object from the
|
---|
559 | * data stored in a <classifier> element */
|
---|
560 | public ClassifierData(Element classifierTag) {
|
---|
561 | content = classifierTag.hasAttribute(GSXML.CLASSIFIER_CONTENT_ATT) ?
|
---|
562 | classifierTag.getAttribute(GSXML.CLASSIFIER_CONTENT_ATT) : "";
|
---|
563 | name = classifierTag.hasAttribute(GSXML.NAME_ATT) ?
|
---|
564 | classifierTag.getAttribute(GSXML.NAME_ATT) : "";
|
---|
565 |
|
---|
566 | // now get <displayItem name="name">value</displayItem>
|
---|
567 | // and <displayItem name="description">descr</displayItem>
|
---|
568 | HashMap displayData = new HashMap(2); //size = 2, because
|
---|
569 | // generally expecting only display Name and Description
|
---|
570 | NodeList nl = classifierTag.getElementsByTagName(
|
---|
571 | GSXML.DISPLAY_TEXT_ELEM);
|
---|
572 | for(int i = 0; i < nl.getLength(); i++) {
|
---|
573 | Element displayItem = (Element)nl.item(0);
|
---|
574 | if(displayItem.hasAttribute(GSXML.NAME_ATT)) {
|
---|
575 | String nameAtt = displayItem.getAttribute(GSXML.NAME_ATT);
|
---|
576 | String value = ParseUtil.getBodyTextValue(displayItem);
|
---|
577 | displayData.put(nameAtt, value);
|
---|
578 | }
|
---|
579 | }
|
---|
580 | String dName = (String)displayData.get(GSXML.DISPLAY_TEXT_NAME);
|
---|
581 | String dDescr = (String)displayData.get(
|
---|
582 | GSXML.DISPLAY_TEXT_DESCRIPTION);
|
---|
583 | this.displayName = (dName == null) ? "" : dName;
|
---|
584 | this.displayDescription = (dDescr == null) ? "" : dDescr;
|
---|
585 |
|
---|
586 | // Can get rid of HashMap now:
|
---|
587 | displayData.clear();
|
---|
588 | displayData = null;
|
---|
589 | }
|
---|
590 |
|
---|
591 | /** The displayName can be used as a label in any widget.
|
---|
592 | * @return the displayName of this ClassifierData object */
|
---|
593 | public String toString() { return this.displayName; }
|
---|
594 |
|
---|
595 | /** @return a display String with the data stored in this ClassifierData
|
---|
596 | * object. Useful for debugging purposes. */
|
---|
597 | public String show() {
|
---|
598 | StringBuffer buf = new StringBuffer(this.name);
|
---|
599 | buf.append(" ");
|
---|
600 | buf.append(this.content);
|
---|
601 | buf.append(" ");
|
---|
602 | buf.append(this.displayName);
|
---|
603 | buf.append(" ");
|
---|
604 | buf.append(this.displayDescription);
|
---|
605 |
|
---|
606 | return buf.toString();
|
---|
607 | }
|
---|
608 | }
|
---|
609 | } |
---|