AggregateUpdatableValue.java
上传用户:hengxinggs
上传日期:2008-01-15
资源大小:212k
文件大小:3k
源码类别:
PlugIns编程
开发平台:
Java
- /*******************************************************************************
- * Copyright (c) 2005 IBM Corporation and others.
- * All rights reserved. This program and the accompanying materials
- * are made available under the terms of the Eclipse Public License v1.0
- * which accompanies this distribution, and is available at
- * http://www.eclipse.org/legal/epl-v10.html
- *
- * Contributors:
- * IBM Corporation - initial API and implementation
- *******************************************************************************/
- package org.eclipse.jface.examples.databinding.model;
- import java.util.StringTokenizer;
- import org.eclipse.jface.databinding.ChangeEvent;
- import org.eclipse.jface.databinding.IChangeListener;
- import org.eclipse.jface.databinding.IUpdatableValue;
- import org.eclipse.jface.databinding.UpdatableValue;
- public class AggregateUpdatableValue extends UpdatableValue {
- private IUpdatableValue[] updatableValues;
- private String delimiter;
- private boolean updating = false;
- private IChangeListener listener = new IChangeListener() {
- public void handleChange(ChangeEvent changeEvent) {
- if (!updating)
- fireChangeEvent(ChangeEvent.CHANGE, null, null);
- }
- };
- public AggregateUpdatableValue(IUpdatableValue[] updatableValues,
- String delimiter) {
- this.updatableValues = updatableValues;
- this.delimiter = delimiter;
- for (int i = 0; i < updatableValues.length; i++) {
- updatableValues[i].addChangeListener(listener);
- }
- }
- public void setValue(Object value) {
- Object oldValue = getValue();
- StringTokenizer tokenizer = new StringTokenizer((String) value,
- delimiter);
- try {
- updating=true;
- for (int i = 0; i < updatableValues.length; i++) {
- if (tokenizer.hasMoreElements()) {
- updatableValues[i].setValue(tokenizer.nextElement());
- }
- else {
- updatableValues[i].setValue(null);
- }
- }
- } finally {
- updating = false;
- }
- fireChangeEvent(ChangeEvent.CHANGE, oldValue, getValue());
- }
- public Object getValue() {
- StringBuffer result = new StringBuffer();
- for (int i = 0; i < updatableValues.length; i++) {
- if (i > 0 & i < updatableValues.length) {
- result.append(delimiter);
- }
- result.append(updatableValues[i].getValue());
- }
- return result.toString();
- }
- public Class getValueType() {
- return String.class;
- }
- public void dispose() {
- for (int i = 0; i < updatableValues.length; i++) {
- updatableValues[i].removeChangeListener(listener);
- }
- super.dispose();
- }
- }