ValueCollectionPropertyValueModelAdapter.java

/*******************************************************************************
 * Copyright (c) 1998, 2015 Oracle and/or its affiliates. All rights reserved.
 * This program and the accompanying materials are made available under the
 * terms of the Eclipse Public License v1.0 and Eclipse Distribution License v. 1.0
 * which accompanies this distribution.
 * The Eclipse Public License is available at http://www.eclipse.org/legal/epl-v10.html
 * and the Eclipse Distribution License is available at
 * http://www.eclipse.org/org/documents/edl-v10.php.
 *
 * Contributors:
 *     Oracle - initial API and implementation from Oracle TopLink
******************************************************************************/
package org.eclipse.persistence.tools.workbench.uitools.app;

import java.util.Arrays;

import org.eclipse.persistence.tools.workbench.utility.Model;
import org.eclipse.persistence.tools.workbench.utility.events.CollectionChangeEvent;
import org.eclipse.persistence.tools.workbench.utility.events.CollectionChangeListener;


/**
 * Extend ValueAspectPropertyValueModelAdapter to listen to one or more collection
 * aspects of the value in the wrapped value model.
 */
public class ValueCollectionPropertyValueModelAdapter
    extends ValueAspectPropertyValueModelAdapter
{

    /** The names of the value's collections that we listen to. */
    protected final String[] collectionNames;

    /** Listener that listens to the value. */
    protected CollectionChangeListener valueCollectionListener;


    // ********** constructors **********

    /**
     * Construct an adapter for the specified value collection.
     */
    public ValueCollectionPropertyValueModelAdapter(PropertyValueModel valueHolder, String collectionName) {
        this(valueHolder, new String[] {collectionName});
    }

    /**
     * Construct an adapter for the specified value collections.
     */
    public ValueCollectionPropertyValueModelAdapter(PropertyValueModel valueHolder, String collectionName1, String collectionName2) {
        this(valueHolder, new String[] {collectionName1, collectionName2});
    }

    /**
     * Construct an adapter for the specified value collections.
     */
    public ValueCollectionPropertyValueModelAdapter(PropertyValueModel valueHolder, String collectionName1, String collectionName2, String collectionName3) {
        this(valueHolder, new String[] {collectionName1, collectionName2, collectionName3});
    }

    /**
     * Construct an adapter for the specified value collections.
     */
    public ValueCollectionPropertyValueModelAdapter(PropertyValueModel valueHolder, String[] collectionNames) {
        super(valueHolder);
        this.collectionNames = collectionNames;
    }


    // ********** initialization **********

    protected void initialize() {
        super.initialize();
        this.valueCollectionListener = this.buildValueCollectionListener();
    }

    /**
     * All we really care about is the fact that a Collection aspect has
     * changed.  Do the same thing no matter which event occurs.
     */
    protected CollectionChangeListener buildValueCollectionListener() {
        return new CollectionChangeListener() {
            public void itemsAdded(CollectionChangeEvent e) {
                ValueCollectionPropertyValueModelAdapter.this.valueAspectChanged();
            }
            public void itemsRemoved(CollectionChangeEvent e) {
                ValueCollectionPropertyValueModelAdapter.this.valueAspectChanged();
            }
            public void collectionChanged(CollectionChangeEvent e) {
                ValueCollectionPropertyValueModelAdapter.this.valueAspectChanged();
            }
            public String toString() {
                return "value collection listener: " + Arrays.asList(ValueCollectionPropertyValueModelAdapter.this.collectionNames);
            }
        };
    }

    protected void startListeningToValue() {
        Model v = (Model) this.value;
        for (int i = this.collectionNames.length; i-- > 0; ) {
            v.addCollectionChangeListener(this.collectionNames[i], this.valueCollectionListener);
        }
    }

    protected void stopListeningToValue() {
        Model v = (Model) this.value;
        for (int i = this.collectionNames.length; i-- > 0; ) {
            v.removeCollectionChangeListener(this.collectionNames[i], this.valueCollectionListener);
        }
    }

}