org.eclipse.jface.databinding.swt.DisplayRealm.java Source code

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Here is the source code for org.eclipse.jface.databinding.swt.DisplayRealm.java

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/*******************************************************************************
 * Copyright (c) 2014, 2018 vogella GmbH and others.
 *
 * This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License 2.0
 * which accompanies this distribution, and is available at
 * https://www.eclipse.org/legal/epl-2.0/
 *
 * SPDX-License-Identifier: EPL-2.0
 *
 * Contributors:
 *     Simon Scholz <simon.scholz@vogella.com> - initial API and implementation based on SWTObservable.getRealm
 *******************************************************************************/
package org.eclipse.jface.databinding.swt;

import java.util.ArrayList;
import java.util.List;
import java.util.Objects;

import org.eclipse.core.databinding.observable.Realm;
import org.eclipse.swt.widgets.Display;

/**
 * This class is used to get a {@link Realm} for a certain {@link Display}.
 *
 * @since 1.7
 *
 */
public class DisplayRealm extends Realm {

    private static List<DisplayRealm> realms = new ArrayList<>();

    /**
     * Returns the realm representing the UI thread for the given display.
     *
     * @param display the display to get realm for
     * @return the realm representing the UI thread for the given display
     */
    public static Realm getRealm(final Display display) {
        synchronized (realms) {
            for (DisplayRealm element : realms) {
                if (element.display == display) {
                    return element;
                }
            }
            DisplayRealm result = new DisplayRealm(display);
            realms.add(result);
            return result;
        }
    }

    private Display display;

    /**
     * @param display
     */
    private DisplayRealm(Display display) {
        this.display = display;
    }

    @Override
    public boolean isCurrent() {
        return Display.getCurrent() == display;
    }

    @Override
    public void asyncExec(final Runnable runnable) {
        Runnable safeRunnable = () -> safeRun(runnable);
        if (!display.isDisposed()) {
            display.asyncExec(safeRunnable);
        }
    }

    @Override
    public void timerExec(int milliseconds, final Runnable runnable) {
        if (!display.isDisposed()) {
            Runnable safeRunnable = () -> safeRun(runnable);
            display.timerExec(milliseconds, safeRunnable);
        }
    }

    @Override
    public int hashCode() {
        return Objects.hashCode(display);
    }

    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (obj == null)
            return false;
        if (getClass() != obj.getClass())
            return false;
        final DisplayRealm other = (DisplayRealm) obj;
        return Objects.equals(display, other.display);
    }
}