/*
 * 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();
    }
}