/*******************************************************************************
 * Copyright (c) 2000, 2003 IBM Corporation and others.
 * All rights reserved. This program and the accompanying materials 
 * are made available under the terms of the Common Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/cpl-v10.html
 * 
 * Contributors:
 *     IBM Corporation - initial API and implementation
 *     MetaMatrix, Inc - repackaging and updates for use as a metadata store
 *******************************************************************************/
package com.metamatrix.core.index;

/**
 * An <code>IIndexer</code> indexes ONE document at each time. It adds the document names and
 * the words references to an IIndex. Each IIndexer can index certain types of document, and should
 * not index the other files. 
 */
public interface IIndexer {
	/**
	 * Returns the file types the <code>IIndexer</code> handles.
	 */

	String[] getFileTypes();
	/**
	 * Indexes the given document, adding the document name and the word references 
	 * to this document to the given <code>IIndex</code>.The caller should use 
	 * <code>shouldIndex()</code> first to determine whether this indexer handles 
	 * the given type of file, and only call this method if so. 
	 */

	void index(IDocument document, IIndexerOutput output) throws java.io.IOException;
	/**
	 * Sets the document types the <code>IIndexer</code> handles.
	 */

	public void setFileTypes(String[] fileTypes);
	/**
	 * Returns whether the <code>IIndexer</code> can index the given document or not.
	 */

	public boolean shouldIndex(IDocument document);
}