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/***************************************************************************
* Copyright (c) 2004-2007 Eike Stepper, Germany.
* 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:
* Eike Stepper - initial API and implementation
**************************************************************************/
package org.eclipse.net4j.util.ui;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.Viewer;
/**
* @author Eike Stepper
*/
public class DelegatingContentProvider implements IStructuredContentProvider
{
public static final String NONE = "";
private IStructuredContentProvider delegate;
private boolean optional;
public DelegatingContentProvider(IStructuredContentProvider delegate, boolean optional)
{
this.delegate = delegate;
this.optional = optional;
}
public DelegatingContentProvider(IStructuredContentProvider delegate)
{
this(delegate, false);
}
public IStructuredContentProvider getDelegate()
{
return delegate;
}
public boolean isOptional()
{
return optional;
}
public void dispose()
{
delegate.dispose();
}
public Object[] getElements(Object inputElement)
{
Object[] elements = delegate.getElements(inputElement);
if (optional)
{
Object[] newElements = new Object[elements.length + 1];
newElements[0] = NONE;
System.arraycopy(elements, 0, newElements, 1, elements.length);
elements = newElements;
}
return elements;
}
public void inputChanged(Viewer viewer, Object oldInput, Object newInput)
{
delegate.inputChanged(viewer, oldInput, newInput);
}
}
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