[4939] | 1 | package org.greenstone.gatherer.util;
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| 2 |
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| 3 | import java.util.*;
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| 4 | import javax.swing.*;
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| 5 | import javax.swing.tree.*;
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| 6 | import org.w3c.dom.*;
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| 7 |
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| 8 | public class DOMTree
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| 9 | extends JTree {
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| 10 |
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| 11 | public DOMTree(Document document) {
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| 12 | super();
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| 13 | setDocument(document);
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| 14 | }
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| 15 |
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| 16 | public void setDocument(Document document) {
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| 17 | setModel(new DefaultTreeModel(new DOMTreeNode(document.getDocumentElement(), null)));
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| 18 | }
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| 19 |
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| 20 | private class DOMTreeNode
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| 21 | implements TreeNode {
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| 22 |
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| 23 | private Node node = null;
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| 24 | private NodeList children = null;
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| 25 | private String text = null;
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| 26 | private TreeNode parent = null;
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| 27 | private TreeNode self = null;
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| 28 |
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| 29 | DOMTreeNode(Node node, TreeNode parent) {
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| 30 | this.node = node;
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| 31 | this.parent = parent;
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| 32 | this.self = this;
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| 33 | }
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| 34 |
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| 35 | /** Returns the children of the receiver as an Enumeration. */
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| 36 | public Enumeration children() {
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| 37 | if(children == null) {
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| 38 | children = node.getChildNodes();
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| 39 | }
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| 40 | return new NodeListEnumeration();
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| 41 | }
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| 42 |
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| 43 | /** Returns true if the receiver allows children. */
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| 44 | public boolean getAllowsChildren() {
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| 45 | return true;
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| 46 | }
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| 47 |
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| 48 | /** Returns the child TreeNode at index childIndex. */
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| 49 | public TreeNode getChildAt(int childIndex) {
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| 50 | if(children == null) {
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| 51 | children = node.getChildNodes();
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| 52 | }
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| 53 | return new DOMTreeNode(children.item(childIndex), this);
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| 54 | }
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| 55 |
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| 56 | /** Returns the number of children TreeNodes the receiver contains. */
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| 57 | public int getChildCount() {
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| 58 | if(children == null) {
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| 59 | children = node.getChildNodes();
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| 60 | }
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| 61 | return children.getLength();
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| 62 | }
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| 63 |
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| 64 | /** Returns the index of node in the receivers children. */
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| 65 | public int getIndex(TreeNode find_node) {
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| 66 | if(children == null) {
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| 67 | children = node.getChildNodes();
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| 68 | }
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| 69 | Node target_node = ((DOMTreeNode)find_node).getNode();
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| 70 | int children_count = children.getLength();
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| 71 | for(int i = 0; i < children_count; i++) {
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| 72 | Node test_node = children.item(i);
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| 73 | if(target_node == test_node) {
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| 74 | test_node = null;
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| 75 | target_node = null;
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| 76 | return i;
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| 77 | }
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| 78 | test_node = null;
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| 79 | }
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| 80 | target_node = null;
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| 81 | return -1;
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| 82 | }
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| 83 |
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| 84 | public Node getNode() {
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| 85 | return node;
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| 86 | }
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| 87 |
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| 88 | /** Returns the parent TreeNode of the receiver. */
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| 89 | public TreeNode getParent() {
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| 90 | return parent;
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| 91 | }
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| 92 |
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| 93 | /** Returns true if the receiver is a leaf. */
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| 94 | public boolean isLeaf() {
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| 95 | return !node.hasChildNodes();
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| 96 | }
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| 97 |
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| 98 | public String toString() {
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| 99 | if(text == null) {
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| 100 | StringBuffer temp = new StringBuffer(node.getNodeName());
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| 101 | String value = node.getNodeValue();
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| 102 | if(value != null && value.length() != 0) {
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| 103 | temp.append("=\"");
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| 104 | temp.append(value);
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| 105 | temp.append("\"");
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| 106 | }
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| 107 | value = null;
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| 108 | if(node instanceof Element) {
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| 109 | Element element = (Element) node;
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| 110 | temp.append(": ");
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| 111 | NamedNodeMap attributes = element.getAttributes();
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| 112 | int attribute_count = attributes.getLength();
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| 113 | for(int i = 0; i < attribute_count; i++) {
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| 114 | Node attribute = attributes.item(i);
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| 115 | temp.append(attribute.getNodeName());
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| 116 | temp.append("=\"");
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| 117 | temp.append(attribute.getNodeValue());
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| 118 | if(i < attribute_count - 1) {
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| 119 | temp.append("\" ");
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| 120 | }
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| 121 | else {
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| 122 | temp.append("\"");
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| 123 | }
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| 124 | }
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| 125 | attributes = null;
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| 126 | element = null;
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| 127 | }
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| 128 | text = temp.toString();
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| 129 | temp = null;
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| 130 | }
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| 131 | return text;
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| 132 | }
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| 133 |
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| 134 | private class NodeListEnumeration
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| 135 | implements Enumeration {
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| 136 | private int index = 0;
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| 137 | /** Tests if this enumeration contains more elements. */
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| 138 | public boolean hasMoreElements() {
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| 139 | return index < children.getLength();
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| 140 | }
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| 141 | /** Returns the next element of this enumeration if this enumeration object has at least one more element to provide. */
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| 142 | public Object nextElement() {
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| 143 | int old_index = index;
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| 144 | index = index + 1;
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| 145 | return new DOMTreeNode(children.item(old_index), self);
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| 146 | }
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| 147 | }
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| 148 | }
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| 149 | }
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