/*******************************************************************************
 * Copyright (c) 2001, 2004 IBM Corporation and others.
 * 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:
 *     IBM Corporation - initial API and implementation
 *     Jens Lukowski/Innoopract - initial renaming/restructuring
 *     
 *******************************************************************************/
package org.eclipse.wst.sse.ui.internal.search;

import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;

/**
 * @author pavery
 */
public class OccurrencesContentProvider implements IStructuredContentProvider {

	protected final Object[] EMPTY_ARRAY = new Object[0];
	private OccurrencesSearchResult fResult = null;
	private TableViewer fTableViewer = null;

	public void clear() {
		if (this.fResult != null)
			this.fResult.clearMatches();
		if (this.fTableViewer != null)
			this.fTableViewer.refresh();
	}

	/*
	 * (non-Javadoc)
	 * 
	 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
	 */
	public void dispose() {
		// do nothing
	}

	public void elementsChanged(Object[] updatedElements) {

		//TODO: copied from JavaSearchTableContentProvider
		int addCount = 0;
		int removeCount = 0;
		for (int i = 0; i < updatedElements.length; i++) {
			if (this.fResult.getMatchCount(updatedElements[i]) > 0) {
				if (this.fTableViewer.testFindItem(updatedElements[i]) != null)
					this.fTableViewer.refresh(updatedElements[i]);
				else
					this.fTableViewer.add(updatedElements[i]);
				addCount++;
			} else {
				this.fTableViewer.remove(updatedElements[i]);
				removeCount++;
			}
		}
	}


	/**
	 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
	 */
	public Object[] getElements(Object inputElement) {

		this.fResult = (OccurrencesSearchResult) inputElement;
		return this.fResult.getMatches();
	}

	/**
	 * @see org.eclipse.jface.viewers.IContentProvider#inputChanged(org.eclipse.jface.viewers.Viewer,
	 *      java.lang.Object, java.lang.Object)
	 */
	public void inputChanged(Viewer viewer, Object oldInput, Object newInput) {

		if (viewer instanceof TableViewer)
			this.fTableViewer = (TableViewer) viewer;
		this.fResult = (OccurrencesSearchResult) newInput;
	}

	public void refresh() {

		if (this.fTableViewer != null)
			this.fTableViewer.refresh();
	}
}