ValueListPropertyValueModelAdapter.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.ListChangeEvent;
import org.eclipse.persistence.tools.workbench.utility.events.ListChangeListener;


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

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

    /** Listener that listens to the value. */
    protected ListChangeListener valueListListener;


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

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

    /**
     * Construct an adapter for the specified value lists.
     */
    public ValueListPropertyValueModelAdapter(PropertyValueModel valueHolder, String listName1, String listName2) {
        this(valueHolder, new String[] {listName1, listName2});
    }

    /**
     * Construct an adapter for the specified value lists.
     */
    public ValueListPropertyValueModelAdapter(PropertyValueModel valueHolder, String listName1, String listName2, String listName3) {
        this(valueHolder, new String[] {listName1, listName2, listName3});
    }

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


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

    protected void initialize() {
        super.initialize();
        this.valueListListener = this.buildValueListListener();
    }

    /**
     * All we really care about is the fact that a List aspect has
     * changed.  Do the same thing no matter which event occurs.
     */
    protected ListChangeListener buildValueListListener() {
        return new ListChangeListener() {
            public void itemsAdded(ListChangeEvent e) {
                ValueListPropertyValueModelAdapter.this.valueAspectChanged();
            }
            public void itemsRemoved(ListChangeEvent e) {
                ValueListPropertyValueModelAdapter.this.valueAspectChanged();
            }
            public void itemsReplaced(ListChangeEvent e) {
                ValueListPropertyValueModelAdapter.this.valueAspectChanged();
            }
            public void listChanged(ListChangeEvent e) {
                ValueListPropertyValueModelAdapter.this.valueAspectChanged();
            }
            public String toString() {
                return "value list listener: " + Arrays.asList(ValueListPropertyValueModelAdapter.this.listNames);
            }
        };
    }

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

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

}