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'databene commons' is an open source Java library by Volker Bergmann. It provides extensions to the Java core library by utility classes, abstract concepts and concrete implementations.

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/*
 * Copyright (C) 2004-2015 Volker Bergmann ([email protected]).
 * All rights reserved.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * http://www.apache.org/licenses/LICENSE-2.0
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.databene.commons.ui.swing;

import java.util.ArrayList;
import java.util.List;

import javax.swing.event.TreeModelEvent;
import javax.swing.event.TreeModelListener;
import javax.swing.tree.TreeModel;

/**
 * Provides handling for {@link TreeModelListener}s.
 * Created: 22.08.2012 17:13:08
 * @since 0.5.18
 * @author Volker Bergmann
 */
public abstract class AbstractTreeModel implements TreeModel {

	private List listeners;
	
	public AbstractTreeModel() {
		this.listeners = new ArrayList();
	}
	
	@Override
	public void addTreeModelListener(TreeModelListener listener) {
		listeners.add(listener);
	}

	@Override
	public void removeTreeModelListener(TreeModelListener listener) {
		listeners.remove(listener);
	}
	
	protected void fireTreeStructureChanged(Object source, Object[] path) {
		TreeModelEvent event = new TreeModelEvent(source, path);
		for (int i = listeners.size() - 1; i >= 0; i--)
			listeners.get(i).treeStructureChanged(event);
	}
	
	protected void fireTreeNodesChanged(Object source, Object[] path, int[] childIndices, Object[] children) {
		TreeModelEvent event = new TreeModelEvent(source, path, childIndices, children);
		for (int i = listeners.size() - 1; i >= 0; i--)
			listeners.get(i).treeNodesChanged(event);
	}

	protected void fireTreeNodesInserted(Object source, Object[] path, int[] childIndices, Object[] children) {
		TreeModelEvent e = new TreeModelEvent(source, path, childIndices, children);
		for (int i = listeners.size() - 1; i >= 0; i--) {
			listeners.get(i).treeNodesInserted(e);
		}
	}
    
	protected void fireTreeNodesRemoved(Object source, Object[] path, int[] childIndices, Object[] children) {
		TreeModelEvent e = new TreeModelEvent(source, path, childIndices, children);
		for (int i = listeners.size() - 1; i >= 0; i --)
			listeners.get(i).treeNodesRemoved(e);
	}
	
}