/*******************************************************************************
 * Copyright (c) 2007, 2008 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
 *     Bob Smith - bug 198880
 *******************************************************************************/

module org.eclipse.core.databinding.ObservablesManager;
import org.eclipse.core.databinding.DataBindingContext;
import org.eclipse.core.databinding.Binding;

import java.lang.all;

import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Map;
import java.util.Set;

import org.eclipse.core.databinding.observable.IObservable;
import org.eclipse.core.internal.databinding.Pair;

/**
 * An observables manager can be used for lifecycle management of
 * {@link IObservable} objects.
 *
 * @noextend This class is not intended to be subclassed by clients.
 *
 * @since 1.0
 *
 */
public class ObservablesManager {

    private Set managedObservables = new HashSet();
    private Set excludedObservables = new HashSet();
    private Map contexts = new HashMap();

    /**
     * Create a new observables manager.
     */
    public this() {
    }

    /**
     * Adds the given observable to this manager.
     *
     * @param observable
     *            the observable
     */
    public void addObservable(IObservable observable) {
        managedObservables.add(observable);
    }

    /**
     * Adds the given observable to this manager's exclusion list. The given
     * observable will not be disposed of by this manager.
     *
     * @param observable
     *            the observable
     */
    public void excludeObservable(IObservable observable) {
        excludedObservables.add(observable);
    }

    /**
     * Adds the given data binding context's target and/or model observables to
     * this manager.
     *
     * @param context
     *            the data binding context
     * @param trackTargets
     *            <code>true</code> if the target observables of the context
     *            should be managed
     * @param trackModels
     *            <code>true</code> if the model observables of the context
     *            should be managed
     */
    public void addObservablesFromContext(DataBindingContext context,
            bool trackTargets, bool trackModels) {
        if (trackTargets || trackModels) {
            contexts.put(context, new Pair(new Boolean(trackTargets),
                    new Boolean(trackModels)));
        }
    }

    /**
     * Disposes of this manager and all observables that it manages.
     */
    public void dispose() {
        Set observables = new HashSet();
        observables.addAll(managedObservables);
        for (Iterator it = contexts.keySet().iterator(); it.hasNext();) {
            DataBindingContext context = cast(DataBindingContext) it.next();
            Pair trackModelsOrTargets = cast(Pair) contexts.get(context);
            bool disposeTargets = (cast(Boolean) trackModelsOrTargets.a)
                    .booleanValue();
            bool disposeModels = (cast(Boolean) trackModelsOrTargets.b)
                    .booleanValue();
            for (Iterator it2 = context.getBindings().iterator(); it2.hasNext();) {
                Binding binding = cast(Binding) it2.next();
                if (disposeTargets) {
                    observables.add(binding.getTarget());
                }
                if (disposeModels) {
                    observables.add(binding.getModel());
                }
            }
        }
        observables.removeAll(excludedObservables);
        for (Iterator it = observables.iterator(); it.hasNext();) {
            IObservable observable = cast(IObservable) it.next();
            observable.dispose();
        }
    }
}