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Groovy example source code file (PropertyPathFullBinding.java)

This example Groovy source code file (PropertyPathFullBinding.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

abstractfullbinding, bean, bindpath, bindpath, hashset, hashset, javabean, propertychangelistener, propertypathfullbinding, propertypathfullbinding, set, set, util

The Groovy PropertyPathFullBinding.java source code

/*
 * Copyright 2008 the original author or authors.
 *
 * 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.codehaus.groovy.binding;

import java.beans.PropertyChangeListener;
import java.beans.PropertyChangeEvent;
import java.util.Set;
import java.util.HashSet;

/**
 * A property path full binding
 */
public class PropertyPathFullBinding extends AbstractFullBinding implements PropertyChangeListener {

    /**
     * The set of all objects where a property change does incur a listener-re-check
     */
    Set updateObjects = new HashSet();

    /**
     * The root set of bind paths we are initested in
     */
    BindPath[] bindPaths;

    /**
     * If we think we are currently bound
     */
    boolean bound;

    public void bind() {
        updateObjects.clear();
        for (BindPath bp : bindPaths) {
            bp.addAllListeners(this, bp.currentObject, updateObjects);
        }
        bound = true;
    }

    public void unbind() {
        updateObjects.clear();
        for (BindPath path : bindPaths) {
            // we can't just remove from the update set,
            // because we may be local or global, the path knows
            path.removeListeners();
        }
        bound = false;
    }

    public void rebind() {
        if (bound) bind();
    }

    public void propertyChange(PropertyChangeEvent evt) {
        if (updateObjects.contains(evt.getSource())) {
            for (BindPath bp : bindPaths) {
                Set newUpdates = new HashSet();
                bp.updatePath(this, bp.currentObject, newUpdates);
                updateObjects = newUpdates;
            }
        }
        update();
    }
}

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