org.jboss.tools.common.editor.AbstractSelectionProvider.java Source code

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Here is the source code for org.jboss.tools.common.editor.AbstractSelectionProvider.java

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/*******************************************************************************
 * Copyright (c) 2007 Exadel, Inc. and Red Hat, Inc.
 * Distributed under license by Red Hat, Inc. All rights reserved.
 * This program is 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:
 *     Exadel, Inc. and Red Hat, Inc. - initial API and implementation
 ******************************************************************************/
package org.jboss.tools.common.editor;

import java.util.*;
import org.eclipse.jface.viewers.*;

import org.jboss.tools.common.model.XModelObject;

public abstract class AbstractSelectionProvider implements ISelectionProvider, IPostSelectionProvider {
    private ArrayList<ISelectionChangedListener> listeners = new ArrayList<ISelectionChangedListener>();

    public void addSelectionChangedListener(ISelectionChangedListener listener) {
        if (!listeners.contains(listener))
            listeners.add(listener);
    }

    public ISelection getSelection() {
        XModelObject o = getSelectedModelObject();
        return (o == null) ? new StructuredSelection() : new StructuredSelection(o);
    }

    public void removeSelectionChangedListener(ISelectionChangedListener listener) {
        listeners.remove(listener);
    }

    public void setSelection(ISelection selection) {
        if (!(selection instanceof StructuredSelection))
            return;
        StructuredSelection ss = (StructuredSelection) selection;
        if (!ss.isEmpty() && (ss.getFirstElement() instanceof XModelObject))
            setSelectedModelObject((XModelObject) ss.getFirstElement());
    }

    public void fireSelectionChanged() {
        if (listeners.isEmpty())
            return;
        ISelection selection = getSelection();
        if (selection == null)
            return;
        SelectionChangedEvent newEvent = new SelectionChangedEvent(this, selection);
        Iterator iterator = listeners.iterator();
        while (iterator.hasNext())
            ((ISelectionChangedListener) iterator.next()).selectionChanged(newEvent);
    }

    protected abstract XModelObject getSelectedModelObject();

    protected abstract void setSelectedModelObject(XModelObject object);

    public void addPostSelectionChangedListener(ISelectionChangedListener listener) {
        // do nothing - workaround for dali
    }

    public void removePostSelectionChangedListener(ISelectionChangedListener listener) {
        // do nothing - workaround for dali
    }

}