/*******************************************************************************
 * Copyright (c) 2004, 2006 IBM 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:
 *     IBM Corporation - initial API and implementation
 * Port to the D programming language:
 *     Frank Benoit <benoit@tionex.de>
 *******************************************************************************/
module dwtx.jface.viewers.deferred.SetModel;

import dwtx.jface.viewers.deferred.AbstractConcurrentModel;
import dwtx.jface.viewers.deferred.IConcurrentModelListener;

import tango.util.collection.HashSet;
import tango.util.collection.model.View;

import dwtx.core.runtime.Assert;

import dwt.dwthelper.utils;

/**
 * Trivial implementation of an <code>IConcurrentModel</code>. Implements
 * an unordered set of elements that fires off change notifications whenever
 * elements are added or removed from the set. All notifications are sent
 * synchronously.
 *
 * @since 3.1
 */
public class SetModel : AbstractConcurrentModel {

    private HashSet!(Object) data;

    public this(){
        data = new HashSet!(Object);
    }

    /**
     * Return the contents of the model.
     * @return the array of elements
     *
     */
    public Object[] getElements() {
        return data.toArray();
    }

    /**
     * Sets the contents to the given array of elements
     *
     * @param newContents new contents of this set
     */
    public void set(Object[] newContents) {
//         Assert.isNotNull(newContents);
        data.clear();
        for (int i = 0; i < newContents.length; i++) {
            Object object = newContents[i];

            data.add(object);
        }

        IConcurrentModelListener[] listeners = getListeners();
        foreach( listener; listeners ){
            listener.setContents(newContents);
        }
    }

    /**
     * Empties the set
     */
    public void clear() {
        Object[] removed = data.toArray();
        data.clear();
        fireRemove(removed);
    }

    /**
     * Adds the given elements to the set
     *
     * @param toAdd elements to add
     */
    public void addAll(Object[] toAdd) {
//         Assert.isNotNull(toAdd);
        for (int i = 0; i < toAdd.length; i++) {
            Object object = toAdd[i];

            data.add(object);
        }

        fireAdd(toAdd);
    }

    /**
     * Adds the given elements to the set. Duplicate elements are ignored.
     *
     * @param toAdd elements to add
     */
    public void addAll(View!(Object) toAdd) {
        Assert.isNotNull(cast(Object)toAdd);
        addAll(toAdd.toArray());
    }

    /**
     * Fires a change notification for all elements in the given array
     *
     * @param changed array of elements that have changed
     */
    public void changeAll(Object[] changed) {
//         Assert.isNotNull(changed);
        fireUpdate(changed);
    }

    /**
     * Removes all of the given elements from the set.
     *
     * @param toRemove elements to remove
     */
    public void removeAll(Object[] toRemove) {
//         Assert.isNotNull(toRemove);
        for (int i = 0; i < toRemove.length; i++) {
            Object object = toRemove[i];

            data.remove(object);
        }

        fireRemove(toRemove);
    }

    /* (non-Javadoc)
     * @see dwtx.jface.viewers.deferred.IConcurrentModel#requestUpdate(dwtx.jface.viewers.deferred.IConcurrentModelListener)
     */
    public void requestUpdate(IConcurrentModelListener listener) {
        Assert.isNotNull(cast(Object)listener);
        listener.setContents(getElements());
    }
}