findnode.html
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<TITLE>Finding a Node in a JTree Component
(Java Developers Almanac Example)
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<META CONTENT="Patrick Chan" NAME="AUTHOR">
<META CONTENT="Code Examples from The Java Developers Almanac 1.4" NAME="DESCRIPTION">
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<A HREF="../index.html">List of Packages</A>
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<B><A HREF="../javax.swing.tree/pkg.html">javax.swing.tree</A></B><font color="#666666" SIZE="-2">
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<B><A HREF="../javax.swing.tree/pkg.html#Nodes">Nodes</A></B><font color="#666666" SIZE="-2">
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<h3>
e1023.
Finding a Node in a JTree Component</h3>
<pre>
// Create tree
JTree tree = new JTree();
// Search forward from first visible row looking for any visible node
// whose name starts with prefix.
int startRow = <font color="#0066ff"><i>0</i></font>;
String prefix = <font color="#0066ff"><i>"b"</i></font>;
TreePath path = tree.getNextMatch(prefix, startRow, Position.Bias.Forward);
// Search backward from last visible row looking for any visible node
// whose name starts with prefix.
startRow = <font color="#0066ff"><i>tree.getRowCount()-1</i></font>;
prefix = <font color="#0066ff"><i>"b"</i></font>;
path = tree.getNextMatch(prefix, startRow, Position.Bias.Backward);
// Find the path (regardless of visibility) that matches the
// specified sequence of names
path = findByName(tree, <font color="#0066ff"><i>new String[]{"JTree", "food", "bananas"}</i></font>);
// Finds the path in tree as specified by the node array.
// The node array is a sequence of nodes where nodes[0]
// is the root and nodes[i] is a child of nodes[i-1].
// Comparison is done using Object.equals().
// Returns null if not found.
public TreePath find(JTree tree, Object[] nodes) {
TreeNode root = (TreeNode)tree.getModel().getRoot();
return find2(tree, new TreePath(root), nodes, 0, false);
}
// Finds the path in tree as specified by the array of names.
// The names array is a sequence of names where names[0]
// is the root and names[i] is a child of names[i-1].
// Comparison is done using String.equals().
// Returns null if not found.
public TreePath findByName(JTree tree, String[] names) {
TreeNode root = (TreeNode)tree.getModel().getRoot();
return find2(tree, new TreePath(root), names, 0, true);
}
private TreePath find2(JTree tree, TreePath parent, Object[] nodes, int depth, boolean byName) {
TreeNode node = (TreeNode)parent.getLastPathComponent();
Object o = node;
// If by name, convert node to a string
if (byName) {
o = o.toString();
}
// If equal, go down the branch
if (o.equals(nodes[depth])) {
// If at end, return match
if (depth == nodes.length-1) {
return parent;
}
// Traverse children
if (node.getChildCount() >= 0) {
for (Enumeration e=node.children(); e.hasMoreElements(); ) {
TreeNode n = (TreeNode)e.nextElement();
TreePath path = parent.pathByAddingChild(n);
TreePath result = find2(tree, path, nodes, depth+1, byName);
// Found a match
if (result != null) {
return result;
}
}
}
}
// No match at this branch
return null;
}
</pre>
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Related Examples
</font></td>
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</table>
e1022. <a class="eglink" href="GetNodes.html?l=rel">
Visiting All the Nodes in a JTree Component
</a>
<br>
e1024. <a class="eglink" href="AddNode.html?l=rel">
Adding a Node to a JTree Component
</a>
<br>
e1025. <a class="eglink" href="RemNode.html?l=rel">
Removing a Node to a JTree Component
</a>
<br>
e1026. <a class="eglink" href="Node2Path.html?l=rel">
Converting a Node in a JTree Component to a TreePath
</a>
<br>
e1027. <a class="eglink" href="Tree2Path.html?l=rel">
Converting All Nodes in a JTree Component to a TreePath Array
</a>
<br>
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See also:
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Events">
Events
</a>
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Layout">
Layout
</a>
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Node%20Expansion">
Node Expansion
</a>
<a class="eglink" href="/egs/javax.swing.tree/pkg.html?l=rel#Selections">
Selections
</a>
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