| /******************************************************************************* |
| * Copyright (c) 2005, 2008 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 |
| * Brad Reynolds - bug 164653 |
| *******************************************************************************/ |
| package org.eclipse.jface.examples.databinding.model; |
| |
| import java.util.StringTokenizer; |
| |
| import org.eclipse.core.databinding.observable.Diffs; |
| import org.eclipse.core.databinding.observable.value.AbstractObservableValue; |
| import org.eclipse.core.databinding.observable.value.IObservableValue; |
| import org.eclipse.core.databinding.observable.value.IValueChangeListener; |
| import org.eclipse.core.databinding.observable.value.ValueChangeEvent; |
| |
| /** |
| * @since 3.2 |
| * |
| */ |
| public class AggregateObservableValue extends AbstractObservableValue { |
| |
| private IObservableValue[] observableValues; |
| |
| private String delimiter; |
| |
| private boolean updating = false; |
| |
| private String currentValue; |
| |
| private IValueChangeListener listener = new IValueChangeListener() { |
| public void handleValueChange(ValueChangeEvent event) { |
| if (!updating) { |
| fireValueChange(Diffs.createValueDiff(currentValue, |
| doGetValue())); |
| } |
| } |
| }; |
| |
| /** |
| * @param observableValues |
| * @param delimiter |
| */ |
| public AggregateObservableValue(IObservableValue[] observableValues, |
| String delimiter) { |
| this.observableValues = observableValues; |
| this.delimiter = delimiter; |
| for (int i = 0; i < observableValues.length; i++) { |
| observableValues[i].addValueChangeListener(listener); |
| } |
| doGetValue(); |
| } |
| |
| public void doSetValue(Object value) { |
| Object oldValue = doGetValue(); |
| StringTokenizer tokenizer = new StringTokenizer((String) value, |
| delimiter); |
| try { |
| updating = true; |
| for (int i = 0; i < observableValues.length; i++) { |
| if (tokenizer.hasMoreElements()) { |
| observableValues[i].setValue(tokenizer.nextElement()); |
| } else { |
| observableValues[i].setValue(null); |
| } |
| } |
| } finally { |
| updating = false; |
| } |
| doGetValue(); |
| fireValueChange(Diffs.createValueDiff(oldValue, value)); |
| } |
| |
| public Object doGetValue() { |
| StringBuffer result = new StringBuffer(); |
| for (int i = 0; i < observableValues.length; i++) { |
| if (i > 0 & i < observableValues.length) { |
| result.append(delimiter); |
| } |
| result.append(observableValues[i].getValue()); |
| } |
| currentValue = result.toString(); |
| return currentValue; |
| } |
| |
| public Object getValueType() { |
| return String.class; |
| } |
| |
| public synchronized void dispose() { |
| for (int i = 0; i < observableValues.length; i++) { |
| observableValues[i].removeValueChangeListener(listener); |
| } |
| super.dispose(); |
| } |
| |
| } |