1 | package com.gs3.testGXT.server.Greenstone;
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2 |
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3 | import java.io.*;
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4 | import java.util.ArrayList;
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5 | import java.util.Enumeration;
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6 |
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7 | import javax.swing.filechooser.*;
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8 | import javax.swing.tree.*;
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9 |
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10 | import org.greenstone.gatherer.DebugStream;
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11 | import org.greenstone.gatherer.file.FileFilter;
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12 | import org.greenstone.gatherer.file.FileSystemModel;
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13 | import org.greenstone.gatherer.metadata.FilenameEncoding;
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14 | import org.greenstone.gatherer.util.ArrayTools;
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15 |
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16 |
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17 | public abstract class BaseFileNode
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18 | implements MutableTreeNode
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19 | {
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20 | protected boolean allows_children = true;
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21 | protected ArrayList<BaseFileNode> child_nodes = null;
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22 | protected ArrayList<BaseFileNode> child_nodes_unfiltered = null;
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23 | protected File file = null;
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24 | protected FileSystemModel model = null;
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25 | protected MutableTreeNode parent = null;
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26 |
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27 | protected String urlEncodedFileName = "";
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28 | protected String urlEncodedFilePath = "";
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29 | protected String filenameEncoding = "";
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30 | /** The string that is displayed as the filename. Attempts to be in the correct encoding. */
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31 | protected String displayFileName = null;
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32 |
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33 |
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34 | public BaseFileNode(File file)
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35 | {
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36 | this.file = file;
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37 |
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38 | if (file != null) {
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39 | // Files cannot have children
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40 | if(file.isFile()) {
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41 | // Cache this result to prevent unceasing missing disk messages being thrown if the
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42 | // removable media was, um, removed after directory mapped
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43 | this.allows_children = false;
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44 | }
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45 | filenameEncoding = "";
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46 | urlEncodedFilePath = FilenameEncoding.calcURLEncodedFilePath(file);
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47 | urlEncodedFileName = FilenameEncoding.calcURLEncodedFileName(urlEncodedFilePath);
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48 |
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49 | // work out the display string (extra special processing for CollectionTreeNodes)
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50 | displayFileName = calcDisplayString();
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51 | }
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52 | }
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53 |
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54 | public String getURLEncodedFileName() { return urlEncodedFileName; }
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55 |
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56 | public String getURLEncodedFilePath() { return urlEncodedFilePath; }
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57 |
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58 | public String getFilenameEncoding() { return filenameEncoding; }
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59 |
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60 |
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61 | /** This method returns a string representation of the filenodes in the tree,
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62 | * that can then be displayed in the tree. Overridden in subclass CollectionTreeNode.
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63 | * Turn FilenameEncoding.DEBUGGING on to see URLEncoded filenames.
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64 | */
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65 | protected String calcDisplayString() {
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66 | if(FilenameEncoding.DEBUGGING) {
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67 | return getURLEncodedFileName();
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68 | } else {
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69 | return file.getName();
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70 | }
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71 | }
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72 |
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73 | /** Returns the children of the node as an Enumeration. */
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74 | public Enumeration<?> children()
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75 | {
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76 | return new FileEnumeration();
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77 | }
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78 |
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79 |
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80 | /** Returns true if the receiver allows children. */
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81 | public boolean getAllowsChildren()
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82 | {
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83 | return allows_children;
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84 | }
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85 |
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86 |
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87 | /** Returns the child TreeNode at index childIndex. */
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88 | public TreeNode getChildAt(int index)
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89 | {
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90 | return (TreeNode) child_nodes.get(index);
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91 | }
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92 |
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93 |
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94 | /** Returns the number of children TreeNodes the receiver contains. */
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95 | public int getChildCount()
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96 | {
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97 | map();
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98 |
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99 | // Use the number of (filtered) child nodes
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100 | if (child_nodes != null) {
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101 | return child_nodes.size();
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102 | }
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103 |
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104 | return 0;
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105 | }
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106 |
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107 |
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108 | /** Returns the index of node in the receivers children. */
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109 | public int getIndex(TreeNode node)
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110 | {
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111 | if (child_nodes != null) {
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112 | return child_nodes.indexOf(node);
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113 | }
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114 |
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115 | return -1;
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116 | }
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117 |
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118 |
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119 | /** Returns the parent TreeNode of the receiver. */
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120 | public TreeNode getParent()
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121 | {
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122 | return parent;
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123 | }
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124 |
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125 |
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126 | /** Adds child to the receiver at index. */
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127 | public void insert(MutableTreeNode child, int index)
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128 | {
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129 | DebugStream.println("Insert " + child + " in " + this + " at index " + index + " [Model: " + model + "]");
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130 | if (child == null) {
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131 | return;
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132 | }
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133 |
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134 | try {
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135 | BaseFileNode child_node = (BaseFileNode) child;
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136 | child_nodes.add(index, child_node);
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137 | child_node.model = model;
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138 | child_node.parent = this;
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139 | }
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140 | catch (Exception exception) {
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141 | DebugStream.printStackTrace(exception);
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142 | }
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143 | }
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144 |
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145 |
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146 | /** Returns true if the receiver is a leaf. */
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147 | public boolean isLeaf()
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148 | {
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149 | return (allows_children == false);
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150 | }
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151 |
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152 |
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153 | /** Removes the child at index from the receiver. */
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154 | public void remove(int index)
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155 | {
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156 | if (index >= 0 && index < child_nodes.size()) {
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157 | child_nodes.remove(index);
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158 | }
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159 | }
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160 |
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161 |
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162 | /** Removes node from the receiver. */
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163 | public void remove(MutableTreeNode node)
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164 | {
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165 | remove(getIndex(node));
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166 | }
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167 |
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168 |
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169 | /** Removes the receiver from its parent. */
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170 | public void removeFromParent()
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171 | {
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172 | parent.remove(this);
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173 | parent = null;
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174 | }
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175 |
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176 |
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177 | /** Resets the user object of the receiver to object. */
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178 | public void setUserObject(Object object) {
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179 | try {
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180 | file = (File) object;
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181 | }
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182 | catch (Exception exception) {
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183 | DebugStream.printStackTrace(exception);
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184 | }
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185 | }
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186 |
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187 |
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188 | // -------------------------------------------------------------------------------
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189 |
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190 |
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191 | public void add(MutableTreeNode child)
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192 | {
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193 | insert(child, child_nodes.size());
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194 | }
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195 |
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196 |
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197 | protected abstract BaseFileNode addChildNode(File file);
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198 |
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199 |
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200 | /** Compare two FileNodes for equality. */
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201 | public boolean equals(BaseFileNode node)
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202 | {
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203 | if (node == null) {
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204 | // Definitely not a match
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205 | return false;
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206 | }
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207 |
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208 | if (file != null) {
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209 | return file.equals(node.getFile());
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210 | }
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211 | else {
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212 | return toString().equals(node.toString());
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213 | }
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214 | }
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215 |
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216 |
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217 | /** Retrieve the file node at the given index, regardless of filters set. */
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218 | public BaseFileNode getChildAtUnfiltered(int index)
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219 | {
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220 | if (index >= 0 && index < size()) {
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221 | return (BaseFileNode) child_nodes_unfiltered.get(index);
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222 | }
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223 | return null;
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224 | }
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225 |
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226 |
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227 | public File getFile() {
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228 | return file;
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229 | }
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230 |
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231 |
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232 | /** Retrieves the tree path from the root node to this node. */
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233 | public TreeNode[] getPath() {
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234 | int count = 0;
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235 | TreeNode current = this;
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236 | while(current != null) {
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237 | count++;
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238 | current = current.getParent();
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239 | }
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240 | TreeNode[] path = new TreeNode[count];
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241 | current = this;
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242 | while(current != null) {
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243 | path[count - 1] = current;
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244 | count--;
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245 | current = current.getParent();
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246 | }
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247 | return path;
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248 | }
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249 |
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250 |
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251 | public boolean isFileSystemRoot() {
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252 | if (file != null) {
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253 | return FileSystemView.getFileSystemView().isFileSystemRoot(file);
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254 | }
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255 | else {
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256 | return false;
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257 | }
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258 | }
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259 |
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260 |
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261 | /** Overridden if necessary by subclasses. */
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262 | public boolean isInLoadedCollection()
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263 | {
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264 | return false;
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265 | }
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266 |
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267 |
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268 | /** Overridden if necessary by subclasses. */
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269 | public boolean isReadOnly()
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270 | {
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271 | return false;
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272 | }
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273 |
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274 |
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275 | public void map()
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276 | {
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277 | // If this node has already been mapped, don't bother doing it again
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278 | if (child_nodes != null) {
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279 | return;
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280 | }
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281 | child_nodes = new ArrayList<BaseFileNode>();
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282 |
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283 | // General case, only map if children are allowed
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284 | if (file != null && getAllowsChildren()) {
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285 | File[] files = file.listFiles();
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286 | if (files != null && files.length > 0) {
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287 | // Sort the child files
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288 | ArrayTools.sort(files);
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289 |
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290 | // Now add them to child_nodes_unfiltered
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291 | child_nodes_unfiltered = new ArrayList<BaseFileNode>();
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292 | for (int i = 0; i < files.length; i++) {
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293 | BaseFileNode child_node = this.addChildNode(files[i]);
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294 | child_nodes_unfiltered.add(child_node);
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295 | }
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296 |
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297 | // Apply the filters set in the model
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298 | FileFilter[] filters = model.getFilters();
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299 | for (int i = 0; filters != null && i < filters.length; i++) {
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300 | files = ArrayTools.filter(files, filters[i].filter, filters[i].exclude);
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301 | }
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302 |
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303 | // Add the files left after filtering to child_nodes
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304 | for (int i = 0, j = 0; (i < child_nodes_unfiltered.size() && j < files.length); i++) {
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305 | // Use the FileNode object in child_nodes_unfiltered rather than creating another
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306 | BaseFileNode file_node = (BaseFileNode) child_nodes_unfiltered.get(i);
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307 | if (file_node.getFile().equals(files[j])) {
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308 | child_nodes.add(file_node);
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309 | j++;
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310 | }
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311 | }
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312 |
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313 | // in case any filename encodings had gone stale,
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314 | // (recalculate these and) refresh the display name
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315 | refreshDescendantEncodings();
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316 |
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317 | }
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318 |
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319 | model.nodeStructureChanged(this);
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320 | }
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321 | }
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322 |
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323 |
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324 | public void refresh()
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325 | {
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326 | unmap();
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327 | map();
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328 | }
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329 |
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330 | // overridden in subclass CollectionTreeNode to reset and reencode display strings
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331 | public void resetDescendantEncodings() {}
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332 | public void refreshDescendantEncodings() {}
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333 |
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334 |
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335 | public void setModel(FileSystemModel model) {
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336 | this.model = model;
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337 | }
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338 |
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339 | public void setParent(MutableTreeNode parent) {
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340 | this.parent = parent;
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341 | }
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342 |
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343 |
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344 | /** Return the total number of child files for the file this node represents, irrespective of filters set. */
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345 | public int size() {
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346 | if (child_nodes_unfiltered != null) {
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347 | return child_nodes_unfiltered.size();
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348 | }
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349 | return 0;
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350 | }
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351 |
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352 |
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353 | public String toString()
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354 | {
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355 | if (isFileSystemRoot()) {
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356 | return file.getAbsolutePath();
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357 | }
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358 | else {
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359 | if(displayFileName == null) {
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360 | displayFileName = calcDisplayString();
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361 | }
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362 | return displayFileName; //return file.getName();
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363 | }
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364 | }
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365 |
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366 |
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367 | /** Unmap this node's children. */
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368 | public void unmap()
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369 | {
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370 | DebugStream.println("Unmapping " + this + "...");
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371 | child_nodes_unfiltered = null;
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372 | child_nodes = null;
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373 | }
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374 |
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375 |
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376 | private class FileEnumeration
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377 | implements Enumeration<Object>
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378 | {
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379 | private int index = 0;
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380 |
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381 | /** Tests if this enumeration contains more elements. */
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382 | public boolean hasMoreElements() {
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383 | return (index < child_nodes.size());
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384 | }
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385 |
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386 | /** Returns the next element of this enumeration if this enumeration object has at least one more element to provide. */
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387 | public Object nextElement() {
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388 | Object result = null;
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389 | if (index < child_nodes.size()) {
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390 | result = child_nodes.get(index);
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391 | index++;
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392 | }
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393 | return result;
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394 | }
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395 | }
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396 | }
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