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/*******************************************************************************
* Copyright (c) 2012 Oracle. 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:
* Oracle - initial API and implementation
******************************************************************************/
package org.eclipse.jpt.common.ui.internal.jface;
import org.eclipse.jface.resource.ImageDescriptor;
import org.eclipse.jpt.common.ui.jface.ItemLabelProvider;
import org.eclipse.jpt.common.utility.internal.ObjectTools;
import org.eclipse.swt.graphics.Image;
/**
* Item label provider that contains unchanging image and text.
*/
public abstract class AbstractStaticItemLabelProvider<M extends ItemLabelProvider.Manager>
implements ItemLabelProvider
{
protected final ImageDescriptor imageDescriptor;
protected final String text;
protected final M manager;
/**
* Construct an item label provider that returns the specified text but
* no image.
*/
protected AbstractStaticItemLabelProvider(String text) {
this(null, text, null);
}
/**
* Construct an item label provider that returns the specified image
* and text. The manager need only be specified if the specified image
* descriptor is not <code>null</code>.
*/
protected AbstractStaticItemLabelProvider(ImageDescriptor imageDescriptor, String text, M manager) {
super();
this.imageDescriptor = imageDescriptor;
this.text = text;
if ((imageDescriptor != null) && (manager == null)) {
throw new NullPointerException();
}
this.manager = manager;
}
public Image getImage() {
return (this.imageDescriptor == null) ? null : this.getImage_();
}
/**
* Pre-condition: the image descriptor is not <code>null</code>.
*/
protected Image getImage_() {
return this.manager.getResourceManager().createImage(this.imageDescriptor);
}
public String getText() {
return this.text;
}
public void dispose() {
if (this.imageDescriptor != null) {
this.manager.getResourceManager().destroyImage(this.imageDescriptor);
}
}
@Override
public String toString() {
return ObjectTools.toString(this, this.text);
}
}
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