/*******************************************************************************
 * Copyright (c) 2006, 2011 IBM Corporation 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:
 *     IBM Corporation - initial API and implementation
 *******************************************************************************/
package org.eclipse.jdt.internal.debug.ui.monitors;

import org.eclipse.core.runtime.CoreException;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext;
import org.eclipse.debug.internal.ui.viewers.model.provisional.IViewerUpdate;

/**
 * Content provider for an 'owning thread' in a monitor tree.
 *
 * @since 3.3
 */
public class OwningThreadContentProvider extends JavaElementContentProvider {

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.model.elements.ElementContentProvider#getChildCount(java.lang.Object, org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext, org.eclipse.core.runtime.IProgressMonitor)
	 */
	@Override
	protected int getChildCount(Object element, IPresentationContext context, IViewerUpdate monitor) throws CoreException {
		if (((JavaOwningThread)element).getContendedMonitor() != null) {
			return 1;
		}
		return 0;
	}

	/* (non-Javadoc)
	 * @see org.eclipse.debug.internal.ui.model.elements.ElementContentProvider#getChildren(java.lang.Object, int, int, org.eclipse.debug.internal.ui.viewers.model.provisional.IPresentationContext, org.eclipse.core.runtime.IProgressMonitor)
	 */
	@Override
	protected Object[] getChildren(Object parent, int index, int length, IPresentationContext context, IViewerUpdate monitor) throws CoreException {
		JavaContendedMonitor contendedMonitor= ((JavaOwningThread)parent).getContendedMonitor();
		if (contendedMonitor == null) {
		    return EMPTY;
		}
		return new Object[]{contendedMonitor};
	}

}