org.springframework.ide.eclipse.boot.dash.model.AbstractDisposable.java Source code

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Here is the source code for org.springframework.ide.eclipse.boot.dash.model.AbstractDisposable.java

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/*******************************************************************************
 * Copyright (c) 2015 Pivotal, Inc.
 * 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
 * https://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Pivotal, Inc. - initial API and implementation
 *******************************************************************************/
package org.springframework.ide.eclipse.boot.dash.model;

import org.eclipse.core.runtime.ListenerList;
import org.springsource.ide.eclipse.commons.livexp.core.DisposeListener;
import org.springsource.ide.eclipse.commons.livexp.core.OnDispose;
import org.springsource.ide.eclipse.commons.livexp.ui.Disposable;

public abstract class AbstractDisposable implements Disposable, OnDispose {

    private ListenerList<DisposeListener> disposeListeners = new ListenerList<>();

    public boolean isDisposed() {
        return disposeListeners == null;
    }

    @Override
    public synchronized void onDispose(DisposeListener l) {
        if (disposeListeners != null) {
            this.disposeListeners.add(l);
        } else {
            //already disposed. Call listener right away!
            l.disposed(this);
        }
    }

    @Override
    public void dispose() {
        ListenerList<DisposeListener> listeners;
        synchronized (this) {
            listeners = disposeListeners;
            disposeListeners = null;
        }
        if (listeners != null) {
            for (Object _l : listeners.getListeners()) {
                DisposeListener l = (DisposeListener) _l;
                l.disposed(this);
            }
        }
    }

    /**
     * Convenience method to declare that a given {@link Disposable} is an 'owned' child of
     * this element and should also be disposed when this element itself is disposed.
     */
    public <C extends Disposable> C addDisposableChild(final C child) {
        onDispose(new DisposeListener() {
            public void disposed(Disposable disposed) {
                child.dispose();
            }
        });
        return child;
    }
}