[15222] | 1 | /**
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| 2 | *#########################################################################
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| 3 | * Displays.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 |
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| 21 | package org.greenstone.gs3client;
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| 22 |
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| 23 | import org.greenstone.gs3client.data.Pair;
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| 24 | import java.awt.event.ActionEvent;
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| 25 | import java.awt.event.ActionListener;
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| 26 | import java.awt.event.MouseAdapter;
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| 27 | import java.awt.event.MouseEvent;
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| 28 | import java.util.Collections;
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| 29 | import java.util.Comparator;
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| 30 | import java.util.Iterator;
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| 31 | import java.util.Map;
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| 32 | import java.util.Vector;
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| 33 | import java.util.Map.Entry;
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| 34 |
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| 35 | import javax.swing.JEditorPane;
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| 36 | import javax.swing.JList;
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| 37 | import javax.swing.JMenuItem;
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| 38 | import javax.swing.JPopupMenu;
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| 39 | import javax.swing.JTree;
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| 40 | import javax.swing.tree.DefaultMutableTreeNode;
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| 41 | import javax.swing.tree.TreePath;
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| 42 |
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| 43 | import org.greenstone.gs3client.data.DocumentNodeData;
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| 44 | import org.greenstone.gs3client.data.ClassifierNodeData;
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| 45 | import org.greenstone.gs3client.data.NodeData;
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| 46 |
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| 47 | /**
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| 48 | * Class containing static methods, static variables and inner classes that
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| 49 | * are used by both SearchResultsDisplay and BrowseDisplay.
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| 50 | * @author ak19
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| 51 | */
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| 52 | public class Displays {
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| 53 | /** Static Comparator object for Pair objects of (name, value) Metadata */
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| 54 | protected static final MetadataComparator comparator = new MetadataComparator();
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| 55 |
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| 56 | /* Static methods. */
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| 57 | /** Recursion to add all descendent docnodes into the tree.
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| 58 | * @param docNode - the documentNodeData object for whose children treenodes
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| 59 | * need to be created.
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| 60 | * @param treeNode - the treeNode associated with the docNode parameter. */
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| 61 | public static void createNodesForChildren(DocumentNodeData docNode,
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| 62 | DefaultMutableTreeNode treeNode)
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| 63 | {
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| 64 | if(docNode == null)
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| 65 | return;
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| 66 | DocumentNodeData[] children = docNode.getDescendents();
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| 67 | if(children == null)
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| 68 | return; // base case, the child was a leaf
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| 69 |
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| 70 | for(int i = 0; i < children.length; i++) {
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| 71 | DefaultMutableTreeNode childTreeNode
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| 72 | = new DefaultMutableTreeNode(children[i]);
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| 73 | treeNode.add(childTreeNode);
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| 74 |
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| 75 | // recursion step to add this child node's children to
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| 76 | // the treeNode representing it
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| 77 | createNodesForChildren(children[i], childTreeNode);
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| 78 | }
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| 79 | }
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| 80 |
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| 81 | /** JEditorPane cannot deal with <img src="" />. It can only handle
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| 82 | * it without ending slash: <img src="" >.
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| 83 | * This method constructs complete html (with html, head and body tags) where
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| 84 | * the parameter imgURL is enclosed inside an img src tag.
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| 85 | * @param imgURL - src URL for a (web) image
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| 86 | * @return the imgURL parameter enclosed in complete html */
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[26180] | 87 | public static String getImgUrlEnclosedInHtml(String baseURL, String imgURL)
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[15222] | 88 | {
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[26180] | 89 | //return "<html><head></head><body><img src=" + imgURL + "></body></html>"; // old Greenstone3
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| 90 |
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| 91 | String htmlStr = "<html><head></head><body>";
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| 92 | int index = imgURL.indexOf("<img src=");
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| 93 | if(index != -1) { // if it already contains an image tag
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| 94 | // check if it's a relative url
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| 95 | index = imgURL.indexOf("://", index + "<img src=".length());
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| 96 | if(index == -1) { // relative, so doesn't have a file:// or http(s):// prefix
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| 97 | imgURL = imgURL.replace("<img src=\"", "<img src=\""+baseURL);
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| 98 | }
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| 99 | htmlStr += imgURL;
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| 100 | }
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| 101 | else { // Old GS3: doesn't yet contain an image tag, embed url in img tag
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| 102 | htmlStr = htmlStr + "<img src=" + imgURL + ">";
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| 103 | }
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| 104 | htmlStr += "</body></html>";
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| 105 | return htmlStr;
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| 106 |
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[15222] | 107 | }
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| 108 |
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| 109 | /** Sorts the metadata of the docNode into the required order and displays
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| 110 | * metadata names in the JList metanames and the associated metadata values
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| 111 | * in the JList metavalues.
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| 112 | * The order is based on metanames: first come all the official metadata
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| 113 | * sets which are recognised by the existence of a period in the metaname
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| 114 | * (eg. dc.creator, dls.title). These are arranged alphabetically.
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| 115 | * Next come all the metadata names that start with a capital letter -
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| 116 | * arranged alphabetically;
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| 117 | * the remainder are organised alphabetically as well, with the last ones
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| 118 | * being those metadata whose names do not start with a letter
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| 119 | * (e.g. "/srclink").
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| 120 | * @param nodeData is the NodeData object (classifierNodeData or
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| 121 | * documentNodeData)
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| 122 | * whose metadata is to be displayed in the metanames and metavalues components.
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| 123 | * @param metanames - a JList to display all the metadata names of nodeData
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| 124 | * @param metavalues - a JList to display all the metadata values of nodeData */
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| 125 | public static void showMeta(NodeData nodeData, JList metanames, JList metavalues)
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| 126 | {
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| 127 | // get the metadata names and values, put them
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| 128 | // into separate arrays and set the contents of
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| 129 | // JLists metanames and metavalues to these arrays.
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| 130 | Map metadata = nodeData.getMetadataList();
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| 131 | if(metadata != null && metadata.size() > 0) {
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| 132 | Iterator i = metadata.entrySet().iterator();
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| 133 | Vector nameValuePairs = new Vector(metadata.size());
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| 134 | while(i.hasNext()) {
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| 135 | Entry entry = (Entry)i.next();
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| 136 | String name = (String)entry.getKey();
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| 137 | Vector values = (Vector)entry.getValue();
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| 138 | for(int j = 0; j < values.size(); j++) {
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| 139 | nameValuePairs.add(new Pair(name, (String)values.get(j)));
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| 140 | }
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| 141 | }
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| 142 | // first sort the Vectors with our comparator:
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| 143 | // see http://java.sun.com/j2se/1.4.2/docs/api/java/util/Collections.html
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| 144 | // method Collections.sort(List l, Comparator c)
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| 145 | // and see http://java.sun.com/j2se/1.4.2/docs/api/java/util/Comparator.html
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| 146 |
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| 147 | // Need to sort the nameValuePairs based on the ordering of the
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| 148 | // *names* portion of each Pair.
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| 149 | // This ordering is defined by the MetadataComparator object
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| 150 | // comparator
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| 151 | // OLD: This ordering is defined by the Comparable interface implemented
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| 152 | // by the vector contents. No comparator was passed into
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| 153 | // Collections.sort(List l) because the vector's contents were Pairs
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| 154 | // which implemented Comparable and therefore the elements were sorted
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| 155 | // based on their "natural ordering".
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| 156 | // see http://java.sun.com/j2se/1.4.2/docs/api/java/lang/Comparable.html
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| 157 | // Collections.sort(nameValuePairs);
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| 158 | Collections.sort(nameValuePairs, comparator);
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| 159 | metanames.setListData(Pair.getFirst(nameValuePairs));
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| 160 | metavalues.setListData(Pair.getSecond(nameValuePairs));
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| 161 |
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| 162 | nameValuePairs.clear();
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| 163 | nameValuePairs = null;
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| 164 | }
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| 165 | }
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| 166 |
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| 167 | /** Handles rightclicks on a treeview of documentNodeData objects by showing
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| 168 | * the popupMenu with associated files that, when selected, can be displayed
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| 169 | * in the htmlPane. Listens to rightclick events, but also handles clicks on
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| 170 | * popup menu items.
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| 171 | * @see <a href="http://java.sun.com/docs/books/tutorial/uiswing/components/menu.html">Java tutorial on menus</a>
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| 172 | */
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| 173 | static class PopupListener extends MouseAdapter implements ActionListener
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| 174 | {
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| 175 | /** Handle to the running GS3JavaClient object to have access to its
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| 176 | * methods */
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| 177 | final GS3JavaClient client;
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| 178 | /** A popup component */
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| 179 | final JPopupMenu popupMenu;
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| 180 | /** The treeView component on which the rightclicks occurred */
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| 181 | final JTree tree;
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| 182 | /** The htmlPane wherein associated files are to be displayed */
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| 183 | final JEditorPane htmlArea;
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| 184 |
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| 185 | /** Package access inner class. Not static, so it depends on outer class'
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| 186 | * PopupListener instance.
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| 187 | * Represents a popup MenuItem that appears on rightclick and contains the
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| 188 | * name(s) of associated files which will be displayed - if any are selected
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| 189 | * - in the main htmlpane. */
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| 190 | class AssocFilePopupItem extends JMenuItem {
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| 191 | /** The documentNodeData that was rightclicked upon */
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| 192 | final DocumentNodeData docNode;
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| 193 |
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| 194 | /** Constructor that creates an AssocFilePopupItem (popup menu item)
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| 195 | * instance for each associated file of a documentNodeData that's been
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| 196 | * rightclicked on. This popupitem displays the name of the associated
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| 197 | * file as a menu item of the popup.
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| 198 | * The outer PopupListener object is set to listen to mouseEvents on
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| 199 | * this PopupMenuItem. It will listen to clicks on this menuItem to
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| 200 | * then display the image. */
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| 201 | public AssocFilePopupItem(DocumentNodeData docNode, String name)
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| 202 | {
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| 203 | super(name);
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| 204 | this.docNode = docNode;
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| 205 | // PopupListener will also process clicks on this shortcut menuitem
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| 206 | this.addActionListener(PopupListener.this);
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| 207 | }
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| 208 | }
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| 209 |
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| 210 | /** Constructor for the PopupListener.
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| 211 | * @param popupMenu - the JPopupMenu object this PopupListener
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| 212 | * will handle mouseEvents for
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| 213 | * @param tree - the JTree object whose documentNodeData was clicked
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| 214 | * @param client - handle to the running GS3JavaClient instance
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| 215 | * @param htmlArea - the html editor pane in which to display the
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| 216 | * associated file chosen from the popupMenu. */
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| 217 | public PopupListener(JPopupMenu popupMenu, JTree tree,
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| 218 | GS3JavaClient client, JEditorPane htmlArea)
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| 219 | {
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| 220 | this.client = client;
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| 221 | this.popupMenu = popupMenu;
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| 222 | this.tree = tree;
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| 223 | this.htmlArea = htmlArea;
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| 224 | }
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| 225 |
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| 226 | /** Called when one of the popup's menuItems was clicked.
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| 227 | * The associated file represented by the menuItem is displayed in the
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| 228 | * html editor pane. */
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| 229 | public void actionPerformed(ActionEvent e) {
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| 230 | // TODO: later, when all gsdlassocfiles are available for each docNode,
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| 231 | // need to change the setText below to make use of imageName and
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| 232 | // the docNode's root's assocFilePath
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| 233 | AssocFilePopupItem menuItem = (AssocFilePopupItem)e.getSource();
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| 234 | DocumentNodeData docNode = menuItem.docNode;
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| 235 |
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| 236 | if(docNode.canBeImage())
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| 237 | htmlArea.setText(
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[26180] | 238 | getImgUrlEnclosedInHtml(client.getBaseURL(), docNode.getImgURL()));
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[15222] | 239 | // JEditorPane does not understand <img />! So use only <img>
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| 240 | else {
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| 241 | String filename = menuItem.getText();
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| 242 | String filepath = client.getFilePath(docNode);
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| 243 | // for the latest exported greenstone colllections
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| 244 | // into fedora, Greenstone prefixes FG in front of image name...
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[26180] | 245 | htmlArea.setText(getImgUrlEnclosedInHtml(client.getBaseURL(), filepath+filename));
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[15222] | 246 | }
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| 247 |
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| 248 | htmlArea.setCaretPosition(0);
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| 249 | popupMenu.removeAll();
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| 250 | }
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| 251 |
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| 252 | /** Possibly a popupEvent */
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| 253 | public void mouseReleased(MouseEvent e) {
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| 254 | // for some reason the popup is visible in miniature, make it
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| 255 | // invisible, then decide whether it needs to be shown again
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| 256 | popupMenu.setVisible(false);
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| 257 | maybeShowPopup(e);
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| 258 | }
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| 259 |
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| 260 | /** Possibly a popupEvent */
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| 261 | public void mousePressed(MouseEvent e) {
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| 262 | maybeShowPopup(e);
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| 263 | }
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| 264 |
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| 265 | /** If the mouseEvent was a trigger (rightclick), displays the popup
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| 266 | * context menu. */
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| 267 | protected void maybeShowPopup(MouseEvent e) {
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| 268 | // For some reason e.isPopupTrigger() does not work. (Probably
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| 269 | // because the rightclick sometimes happens on the tiny popup
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| 270 | // which is visible but too small to see.)
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| 271 | // The rightclick appears to only be registered on the popup:
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| 272 | // and popup.isPopupTrigger(e) responds even when the popup
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| 273 | // is already visible
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| 274 | if(popupMenu.isPopupTrigger(e)) {
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| 275 | // remove old rightclick menu items
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| 276 | popupMenu.removeAll();
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| 277 |
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| 278 | // get the closest node in the docStructureTree to that which
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| 279 | // was rightclicked
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| 280 | TreePath path = tree.getClosestPathForLocation(
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| 281 | e.getX(), e.getY());
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| 282 | // the following line will select this nearest node and trigger
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| 283 | // TreeSelectionListener by calling valueChanged(), which will
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| 284 | // retrieve the structure and display the metadata:
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| 285 | (tree.getSelectionModel()).setSelectionPath(path);
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| 286 | DefaultMutableTreeNode node
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| 287 | = (DefaultMutableTreeNode)path.getLastPathComponent();
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| 288 | if(node.getUserObject() instanceof ClassifierNodeData) //
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| 289 | return; //
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| 290 | DocumentNodeData docNode = (DocumentNodeData)node.getUserObject();
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| 291 | // We need the root and the image url part of the metadata, so
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| 292 | // ensure we have that:
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| 293 | if(docNode.getRoot() == null) //
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| 294 | client.retrieveTitledStructureFor(docNode); //
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| 295 |
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| 296 | Vector v = docNode.getAssociatedFileNames();
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| 297 | if(v.size() > 0) { // there are associated files
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| 298 | for(int i = 0; i < v.size(); i++) {
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| 299 | Pair p = (Pair)v.get(i);
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| 300 | JMenuItem menuItem
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| 301 | = new AssocFilePopupItem(docNode, p.first);
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| 302 | popupMenu.add(menuItem);
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| 303 | }
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| 304 | popupMenu.show(e.getComponent(), e.getX(), e.getY());
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| 305 | } else if(docNode.canBeImage()) { // add rightclick popup menu that will
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| 306 | // display image upon click
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| 307 | JMenuItem menuItem = new AssocFilePopupItem(docNode, docNode.getImgName());
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| 308 | popupMenu.add(menuItem);
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| 309 | popupMenu.show(e.getComponent(), e.getX(), e.getY());
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| 310 | }
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| 311 | }
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| 312 | }
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| 313 | }
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| 314 |
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| 315 | /** Static inner class MetadataComparator is a Comparator for the metadata
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| 316 | * fields stored as a list of Pair objects (name, values).
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| 317 | * We want to display them alphabetised, grouped by prefix (dls.title, dls.x;
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| 318 | * dc.title; dc.creator; greenstone's ex metadata does not have a prefix)
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| 319 | * and in order of alphabet BUT all those starting with capital letters come
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| 320 | * first, then come those starting with lowercase letters.
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| 321 | * Those with prefixes come first of all.
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| 322 | * @see http://java.sun.com/j2se/1.4.2/docs/api/java/util/Comparator.html
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| 323 | * Comparators can be passed to a sort method (such as Collections.sort) to
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| 324 | * allow precise control over the sort order. Comparators can also be used to
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| 325 | * control the order of certain data structures (such as TreeSet or TreeMap). */
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| 326 | public static class MetadataComparator implements Comparator {
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| 327 | public int compare(Object nodeID1, Object nodeID2) {
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| 328 | if(nodeID1 == null && nodeID2 == null)
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| 329 | return 0;
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| 330 | if(nodeID1 == null)
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| 331 | return 1;
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| 332 | if(nodeID2 == null)
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| 333 | return -1;
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| 334 |
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| 335 | String metaName1 = ((Pair)nodeID1).first;
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| 336 | String metaName2 = ((Pair)nodeID2).first;
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| 337 |
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| 338 | if(metaName1.equals(metaName2))
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| 339 | return 0; // same
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| 340 |
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| 341 | if(metaName1.indexOf('.') != -1 && metaName2.indexOf('.') == -1)
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| 342 | return -1; // only c1 has a period, so c1 comes before c2
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| 343 | if(metaName2.indexOf('.') != -1 && metaName1.indexOf('.') == -1)
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| 344 | return 1; // only c2 has a period, so c2 comes before c1
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| 345 |
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| 346 | // we're going to inspect the first letters, so store these
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| 347 | char c1 = metaName1.charAt(0);
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| 348 | char c2 = metaName2.charAt(0);
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| 349 |
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| 350 | if(Character.isUpperCase(c1) && Character.isLowerCase(c2))
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| 351 | return -1; // only c1 starts with uppercase, so c1 comes before c2
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| 352 | if(Character.isUpperCase(c2) && Character.isLowerCase(c1))
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| 353 | return 1; // only c2 starts with uppercase, so c2 comes before c1
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| 354 |
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| 355 | // we want metadatanames like "/srclink" to come at the end, because
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| 356 | // they don't start with a letter
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| 357 | if(!Character.isLetter(c2) && Character.isLetter(c1))
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| 358 | return -1; // if c2 starts with some strange character,
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| 359 | // c1 comes before c2 in the ordering
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| 360 | if(!Character.isLetter(c1) && Character.isLetter(c2))
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| 361 | return 1; // if c1 starts with some strange character,
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| 362 | // c2 comes before c1 in the ordering
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| 363 |
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| 364 | // otherwise, all else being equal (both start with
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| 365 | // uppercase/lowercase or both contain/don't contain periods or
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| 366 | // both start with/don't start with letters): so sort them in
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| 367 | // alphabetic order.
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| 368 | return metaName1.compareTo(metaName2);
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| 369 | }
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| 370 |
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| 371 | //public boolean equals(Object obj) {
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| 372 | // return obj.equals(this);
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| 373 | //}
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| 374 | }
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| 375 | }
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