MatchesContentProvider.java

/**
 * This file Copyright (c) 2005-2008 Aptana, Inc. This program is
 * dual-licensed under both the Aptana Public License and the GNU General
 * Public license. You may elect to use one or the other of these licenses.
 * 
 * This program is distributed in the hope that it will be useful, but
 * AS-IS and WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE, TITLE, or
 * NONINFRINGEMENT. Redistribution, except as permitted by whichever of
 * the GPL or APL you select, is prohibited.
 *
 * 1. For the GPL license (GPL), you can redistribute and/or modify this
 * program under the terms of the GNU General Public License,
 * Version 3, as published by the Free Software Foundation.  You should
 * have received a copy of the GNU General Public License, Version 3 along
 * with this program; if not, write to the Free Software Foundation, Inc., 51
 * Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
 * 
 * Aptana provides a special exception to allow redistribution of this file
 * with certain other free and open source software ("FOSS") code and certain additional terms
 * pursuant to Section 7 of the GPL. You may view the exception and these
 * terms on the web at http://www.aptana.com/legal/gpl/.
 * 
 * 2. For the Aptana Public License (APL), this program and the
 * accompanying materials are made available under the terms of the APL
 * v1.0 which accompanies this distribution, and is available at
 * http://www.aptana.com/legal/apl/.
 * 
 * You may view the GPL, Aptana's exception and additional terms, and the
 * APL in the file titled license.html at the root of the corresponding
 * plugin containing this source file.
 * 
 * Any modifications to this file must keep this entire header intact.
 */
package com.aptana.ide.search;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.HashMap;
import java.util.HashSet;
import java.util.Iterator;

import org.eclipse.jface.viewers.IContentProvider;
import org.eclipse.jface.viewers.IStructuredContentProvider;
import org.eclipse.jface.viewers.StructuredViewer;
import org.eclipse.jface.viewers.TableViewer;
import org.eclipse.jface.viewers.Viewer;
import org.eclipse.search.ui.text.AbstractTextSearchResult;
import org.eclipse.search.ui.text.Match;


/**
 * @author Pavel Petrochenko
 * Content provider for a matches in work space
 */
final class MatchesContentProvider implements IStructuredContentProvider
{

	//private int limit = Compatibility.getTableLimit();
	/**
	 * 
	 */
	private final AptanaFileSearchPage aptanaFileSearchPage;
	private final IContentProvider contentProvider;

	/**
	 * constructor
	 * @param aptanaFileSearchPage
	 * @param contentProvider base content provider
	 */
	MatchesContentProvider(AptanaFileSearchPage aptanaFileSearchPage, IContentProvider contentProvider)
	{
		this.aptanaFileSearchPage = aptanaFileSearchPage;
		this.contentProvider = contentProvider;
	}

	HashMap mmap = new HashMap();

	/**
	 * @param input
	 * @param limit
	 * @return matches for a given input (search result)
	 */
	protected Object[] getMathes(AbstractTextSearchResult input, int limit)
	{
		ArrayList result = new ArrayList();
		Object[] elements = input.getElements();
		l2: for (int b = 0; b < elements.length; b++)
		{
			Match[] matches = this.aptanaFileSearchPage.getInput().getMatches(elements[b]);
			this.mmap.put(elements[b], matches);
			for (int a = 0; a < matches.length; a++)
			{
				result.add(matches[a]);
				if ((result.size() == limit))
				{
					break l2;
				}
			}
		}
		return result.toArray();
	}

	/**
	 * @see org.eclipse.jface.viewers.IStructuredContentProvider#getElements(java.lang.Object)
	 */
	public Object[] getElements(Object inputElement)
	{
		if (inputElement instanceof AbstractTextSearchResult)
		{
			return this.getMathes((AbstractTextSearchResult) inputElement, getElementLimit());
		}
		return AptanaFileSearchPage.NO_ELEMENTS;
	}

	private int getElementLimit()
	{
		return this.aptanaFileSearchPage.getElementLimit1().intValue();
	}

	/**
	 * @see org.eclipse.jface.viewers.IContentProvider#dispose()
	 */
	public void dispose()
	{
		this.contentProvider.dispose();
	}

	/**
	 * @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)
	{
		this.mmap = new HashMap(1000);		
		this.contentProvider.inputChanged(viewer, oldInput, newInput);
	}

	/**
	 * handles updates
	 * @param updatedElements
	 * updates elements 
	 */
	public void elementsChanged(Object[] updatedElements)
	{
		StructuredViewer viewer2 = this.aptanaFileSearchPage.getViewer();
		TableViewer viewer = (TableViewer) viewer2;
		int elementLimit = this.getElementLimit();
		boolean tableLimited = getElementLimit()==-1;
		AbstractTextSearchResult input = this.aptanaFileSearchPage.getInput();
		for (int i = 0; i < updatedElements.length; i++)
		{
			Object element = updatedElements[i];

			Match[] matchs = (Match[]) this.mmap.get(element);
			if (matchs == null)
			{
				matchs = AptanaFileSearchPage.NO_MATCH;
			}
			if (input.getMatchCount(element) > 0)
			{
				Match[] matches = input.getMatches(element);
				HashSet set = new HashSet(Arrays.asList(matches));
				for (int a = 0; a < matchs.length; a++)
				{
					Match m = matchs[a];
					if (!set.contains(m))
					{
						viewer.remove(m);
					}
					else
					{
						set.remove(m);
					}
				}
				this.mmap.put(element, matches);
				for (Iterator iterator = set.iterator(); iterator.hasNext();)
				{
					Match name = (Match) iterator.next();
					if (!tableLimited || (viewer.getTable().getItemCount() < elementLimit))
					{
						viewer.add(name);
					}
					else
					{
						break;
					}
				}
			}
			else
			{
				viewer.remove(matchs);
			}
		}
	}
}