Java example source code file (SampleTreeModel.java)

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Java - Java tags/keywords

awt, defaultmutabletreenode, defaulttreemodel, jtree, object, override, sampledata, sampletreemodel, suppresswarnings, tree

The SampleTreeModel.java Java example source code

/*
 * Copyright (c) 1997, 2011, Oracle and/or its affiliates. All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 *   - Redistributions of source code must retain the above copyright
 *     notice, this list of conditions and the following disclaimer.
 *
 *   - Redistributions in binary form must reproduce the above copyright
 *     notice, this list of conditions and the following disclaimer in the
 *     documentation and/or other materials provided with the distribution.
 *
 *   - Neither the name of Oracle nor the names of its
 *     contributors may be used to endorse or promote products derived
 *     from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS
 * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO,
 * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR
 * PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL THE COPYRIGHT OWNER OR
 * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL,
 * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
 * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
 * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
 * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
 * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 */

/*
 * This source code is provided to illustrate the usage of a given feature
 * or technique and has been deliberately simplified. Additional steps
 * required for a production-quality application, such as security checks,
 * input validation and proper error handling, might not be present in
 * this sample code.
 */



import javax.swing.tree.DefaultTreeModel;
import javax.swing.tree.TreeNode;
import javax.swing.tree.TreePath;
import javax.swing.tree.DefaultMutableTreeNode;
import java.awt.Color;


/**
 * SampleTreeModel extends JTreeModel to extends valueForPathChanged.
 * This method is called as a result of the user editing a value in
 * the tree.  If you allow editing in your tree, are using TreeNodes
 * and the user object of the TreeNodes is not a String, then you're going
 * to have to subclass JTreeModel as this example does.
 *
 * @author Scott Violet
 */
@SuppressWarnings("serial")
public class SampleTreeModel extends DefaultTreeModel {

    /**
     * Creates a new instance of SampleTreeModel with newRoot set
     * to the root of this model.
     */
    public SampleTreeModel(TreeNode newRoot) {
        super(newRoot);
    }

    /**
     * Subclassed to message setString() to the changed path item.
     */
    @Override
    public void valueForPathChanged(TreePath path, Object newValue) {
        /* Update the user object. */
        DefaultMutableTreeNode aNode = (DefaultMutableTreeNode) path.
                getLastPathComponent();
        SampleData sampleData = (SampleData) aNode.getUserObject();

        sampleData.setString((String) newValue);
        /* UUUhhhhh, pretty colors. */
        sampleData.setColor(Color.green);

        /* Since we've changed how the data is to be displayed, message
        nodeChanged. */
        nodeChanged(aNode);
    }
}