/*******************************************************************************
 * Copyright (c) 2006-2008 Cerner 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:
 *     Brad Reynolds - initial API and implementation
 *     Matthew Hall - bug 208332
 ******************************************************************************/

module org.eclipse.core.internal.databinding.observable.UnmodifiableObservableList;

import java.lang.all;

import org.eclipse.core.databinding.observable.IStaleListener;
import org.eclipse.core.databinding.observable.StaleEvent;
import org.eclipse.core.databinding.observable.list.IListChangeListener;
import org.eclipse.core.databinding.observable.list.IObservableList;
import org.eclipse.core.databinding.observable.list.ListChangeEvent;
import org.eclipse.core.databinding.observable.list.ObservableList;

/**
 * ObservableList implementation that prevents modification by consumers. Events
 * in the originating wrapped list are propagated and thrown from this instance
 * when appropriate.  All mutators throw an UnsupportedOperationException.
 * 
 * @since 1.0
 */
/*
 * Implementation makes the assumption that the superclass cast(ObservableList) is
 * unmodifiable and that all modify methods throw an
 * UnsupportedOperationException.
 */
public class UnmodifiableObservableList : ObservableList {
    /**
     * List that is being made unmodifiable.
     */
    private IObservableList wrappedList;

    private IListChangeListener listChangeListener = new class() IListChangeListener {
        public void handleListChange(ListChangeEvent event) {
            // Fires a Change and then ListChange event.
            fireListChange(event.diff);
        }
    };

    private IStaleListener staleListener = new class() IStaleListener {
        public void handleStale(StaleEvent event) {
            fireStale();
        }
    };

    /**
     * @param wrappedList
     */
    public this(IObservableList wrappedList) {
        super(wrappedList.getRealm(), wrappedList, wrappedList.getElementType());
        this.wrappedList = wrappedList;

        wrappedList.addListChangeListener(listChangeListener);

        wrappedList.addStaleListener(staleListener);
    }

    /**
     * Because this instance is immutable staleness cannot be changed.
     * 
     * @throws UnsupportedOperationException
     *             because this instance is unmodifiable.
     */
    public void setStale(bool stale) {
        throw new UnsupportedOperationException();
    }

    public bool isStale() {
        getterCalled();
        return wrappedList is null ? false : wrappedList.isStale();
    }

    public synchronized void dispose() {
        if (wrappedList !is null) {
            wrappedList.removeListChangeListener(listChangeListener);
            wrappedList.removeStaleListener(staleListener);
            wrappedList = null;
        }
        listChangeListener = null;
        staleListener = null;
        super.dispose();
    }
}