1 | package org.greenstone.gatherer.file;
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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 | import javax.swing.*;
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7 | import javax.swing.filechooser.*;
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8 | import javax.swing.tree.*;
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9 | import org.greenstone.gatherer.DebugStream;
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10 | import org.greenstone.gatherer.util.ArrayTools;
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11 |
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12 |
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13 | public abstract class FileNode
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14 | implements MutableTreeNode
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15 | {
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16 | protected boolean allows_children = true;
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17 | protected ArrayList child_nodes = null;
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18 | protected ArrayList child_nodes_unfiltered = null;
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19 | protected File file = null;
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20 | protected FileSystemModel model = null;
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21 | protected MutableTreeNode parent = null;
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22 |
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23 |
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24 | public FileNode(File file)
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25 | {
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26 | this.file = file;
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27 |
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28 | // Files cannot have children
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29 | if (file != null && file.isFile()) {
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30 | // Cache this result to prevent unceasing missing disk messages being thrown if the
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31 | // removable media was, um, removed after directory mapped
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32 | this.allows_children = false;
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33 | }
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34 | }
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35 |
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36 |
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37 | /** Returns the children of the node as an Enumeration. */
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38 | public Enumeration children()
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39 | {
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40 | return new FileEnumeration();
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41 | }
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42 |
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43 |
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44 | /** Returns true if the receiver allows children. */
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45 | public boolean getAllowsChildren()
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46 | {
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47 | return allows_children;
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48 | }
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49 |
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50 |
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51 | /** Returns the child TreeNode at index childIndex. */
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52 | public TreeNode getChildAt(int index)
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53 | {
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54 | return (TreeNode) child_nodes.get(index);
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55 | }
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56 |
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57 |
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58 | /** Returns the number of children TreeNodes the receiver contains. */
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59 | public int getChildCount()
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60 | {
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61 | int size = 0;
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62 |
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63 | // We don't map if this is a system root, or we risk the 50,000 Disk not found error messages of death
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64 | if (isFileSystemRoot()) {
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65 | size = 1; // Size is always non-zero for a system root
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66 | }
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67 | else {
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68 | map();
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69 | }
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70 |
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71 | // Use the number of (filtered) child nodes
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72 | if (child_nodes != null) {
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73 | size = child_nodes.size();
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74 | }
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75 |
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76 | return size;
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77 | }
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78 |
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79 |
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80 | /** Returns the index of node in the receivers children. */
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81 | public int getIndex(TreeNode node)
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82 | {
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83 | if (child_nodes != null) {
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84 | return child_nodes.indexOf(node);
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85 | }
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86 |
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87 | return -1;
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88 | }
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89 |
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90 |
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91 | /** Returns the parent TreeNode of the receiver. */
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92 | public TreeNode getParent()
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93 | {
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94 | return parent;
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95 | }
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96 |
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97 |
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98 | /** Adds child to the receiver at index. */
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99 | public void insert(MutableTreeNode child, int index)
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100 | {
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101 | DebugStream.println("Insert " + child + " in " + this + " at index " + index + " [Model: " + model + "]");
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102 | if (child == null) {
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103 | return;
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104 | }
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105 |
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106 | try {
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107 | FileNode child_node = (FileNode) child;
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108 | child_nodes.add(index, child_node);
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109 | child_node.model = model;
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110 | child_node.parent = this;
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111 | }
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112 | catch (Exception exception) {
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113 | DebugStream.printStackTrace(exception);
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114 | }
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115 | }
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116 |
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117 |
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118 | /** Returns true if the receiver is a leaf. */
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119 | public boolean isLeaf()
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120 | {
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121 | return (allows_children == false);
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122 | }
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123 |
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124 |
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125 | /** Removes the child at index from the receiver. */
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126 | public void remove(int index)
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127 | {
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128 | if (index >= 0 && index < child_nodes.size()) {
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129 | child_nodes.remove(index);
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130 | }
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131 | }
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132 |
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133 |
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134 | /** Removes node from the receiver. */
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135 | public void remove(MutableTreeNode node)
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136 | {
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137 | remove(getIndex(node));
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138 | }
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139 |
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140 |
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141 | /** Removes the receiver from its parent. */
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142 | public void removeFromParent()
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143 | {
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144 | parent.remove(this);
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145 | parent = null;
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146 | }
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147 |
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148 |
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149 | /** Resets the user object of the receiver to object. */
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150 | public void setUserObject(Object object) {
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151 | try {
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152 | file = (File) object;
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153 | }
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154 | catch (Exception exception) {
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155 | DebugStream.printStackTrace(exception);
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156 | }
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157 | }
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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 |
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163 | public void add(MutableTreeNode child)
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164 | {
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165 | insert(child, child_nodes.size());
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166 | }
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167 |
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168 |
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169 | protected abstract FileNode addChildNode(File file);
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170 |
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171 |
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172 | /** Compare two FileNodes for equality. */
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173 | public boolean equals(FileNode node)
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174 | {
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175 | if (node == null) {
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176 | // Definitely not a match
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177 | return false;
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178 | }
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179 |
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180 | if (file != null) {
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181 | return file.equals(node.getFile());
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182 | }
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183 | else {
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184 | return toString().equals(node.toString());
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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 | /** Retrieve the file node at the given index, regardless of filters set. */
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190 | public FileNode getChildAtUnfiltered(int index)
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191 | {
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192 | if (index >= 0 && index < size()) {
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193 | return (FileNode) child_nodes_unfiltered.get(index);
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194 | }
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195 | return null;
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196 | }
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197 |
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198 |
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199 | public File getFile() {
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200 | return file;
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201 | }
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202 |
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203 |
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204 | /** Retrieves the tree path from the root node to this node. */
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205 | public TreeNode[] getPath() {
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206 | int count = 0;
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207 | TreeNode current = this;
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208 | while(current != null) {
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209 | count++;
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210 | current = current.getParent();
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211 | }
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212 | TreeNode[] path = new TreeNode[count];
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213 | current = this;
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214 | while(current != null) {
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215 | path[count - 1] = current;
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216 | count--;
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217 | current = current.getParent();
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218 | }
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219 | return path;
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220 | }
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221 |
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222 |
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223 | public boolean isFileSystemRoot() {
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224 | if (file != null) {
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225 | return FileSystemView.getFileSystemView().isFileSystemRoot(file);
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226 | }
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227 | else {
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228 | return false;
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229 | }
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230 | }
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231 |
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232 |
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233 | /** Overridden if necessary by subclasses. */
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234 | public boolean isInLoadedCollection()
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235 | {
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236 | return false;
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237 | }
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238 |
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239 |
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240 | /** Overridden if necessary by subclasses. */
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241 | public boolean isReadOnly()
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242 | {
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243 | return false;
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244 | }
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245 |
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246 |
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247 | public void map()
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248 | {
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249 | // If this node has already been mapped, don't bother doing it again
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250 | if (child_nodes != null) {
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251 | return;
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252 | }
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253 | child_nodes = new ArrayList();
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254 |
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255 | // General case, only map if children are allowed
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256 | if (file != null && getAllowsChildren()) {
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257 | File[] files = file.listFiles();
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258 | if (files != null && files.length > 0) {
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259 | // Sort the child files
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260 | ArrayTools.sort(files);
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261 |
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262 | // Now add them to child_nodes_unfiltered
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263 | child_nodes_unfiltered = new ArrayList();
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264 | for (int i = 0; i < files.length; i++) {
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265 | FileNode child_node = this.addChildNode(files[i]);
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266 | child_nodes_unfiltered.add(child_node);
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267 | }
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268 |
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269 | // Apply the filters set in the model
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270 | FileFilter[] filters = model.getFilters();
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271 | for (int i = 0; filters != null && i < filters.length; i++) {
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272 | files = ArrayTools.filter(files, filters[i].filter, filters[i].exclude);
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273 | }
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274 |
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275 | // Add the files left after filtering to child_nodes
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276 | for (int i = 0; i < files.length; i++) {
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277 | // Use the FileNode object in child_nodes_unfiltered rather than creating another
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278 | for (int j = 0; j < child_nodes_unfiltered.size(); j++) {
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279 | if (((FileNode) child_nodes_unfiltered.get(j)).getFile().equals(files[i])) {
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280 | child_nodes.add(child_nodes_unfiltered.get(j));
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281 | break;
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282 | }
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283 | }
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284 | }
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285 | }
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286 |
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287 | model.nodeStructureChanged(this);
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288 | }
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289 | }
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290 |
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291 |
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292 | public void refresh()
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293 | {
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294 | unmap();
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295 | map();
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296 | }
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297 |
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298 |
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299 | public void setModel(FileSystemModel model) {
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300 | this.model = model;
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301 | }
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302 |
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303 | public void setParent(MutableTreeNode parent) {
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304 | this.parent = parent;
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305 | }
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306 |
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307 |
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308 | /** Return the total number of child files for the file this node represents, irrespective of filters set. */
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309 | public int size() {
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310 | if (child_nodes_unfiltered != null) {
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311 | return child_nodes_unfiltered.size();
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312 | }
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313 | return 0;
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314 | }
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315 |
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316 |
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317 | public String toString()
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318 | {
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319 | if (isFileSystemRoot()) {
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320 | return file.getAbsolutePath();
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321 | }
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322 | else {
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323 | return file.getName();
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324 | }
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325 | }
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326 |
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327 |
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328 | /** Unmap this node's children. */
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329 | public void unmap()
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330 | {
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331 | DebugStream.println("Unmapping " + this + "...");
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332 | child_nodes_unfiltered = null;
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333 | child_nodes = null;
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334 | }
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335 |
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336 |
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337 | private class FileEnumeration
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338 | implements Enumeration
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339 | {
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340 | private int index = 0;
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341 |
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342 | /** Tests if this enumeration contains more elements. */
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343 | public boolean hasMoreElements() {
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344 | return (index < child_nodes.size());
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345 | }
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346 |
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347 | /** Returns the next element of this enumeration if this enumeration object has at least one more element to provide. */
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348 | public Object nextElement() {
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349 | Object result = null;
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350 | if (index < child_nodes.size()) {
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351 | result = child_nodes.get(index);
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352 | index++;
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353 | }
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354 | return result;
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355 | }
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356 | }
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357 | }
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