/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.cocoon.samples;

import java.io.File;
import java.io.IOException;
import java.net.MalformedURLException;
import java.net.URL;

import org.apache.avalon.framework.context.Context;
import org.apache.avalon.framework.context.ContextException;
import org.apache.avalon.framework.context.Contextualizable;
import org.apache.avalon.framework.service.ServiceException;
import org.apache.avalon.framework.service.ServiceManager;
import org.apache.avalon.framework.service.Serviceable;
import org.apache.cocoon.Constants;
import org.apache.cocoon.ProcessingException;
import org.apache.cocoon.components.search.LuceneCocoonHelper;
import org.apache.cocoon.components.search.LuceneCocoonIndexer;
import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.store.Directory;

/**
 * This is a sample helper class that can be used from flow to 
 * create an index.
 * @version $Id$
 */
public class LuceneUtil 
    implements Contextualizable, Serviceable {

    private File workDir;
    private ServiceManager manager;

    /* (non-Javadoc)
     * @see org.apache.avalon.framework.context.Contextualizable#contextualize(org.apache.avalon.framework.context.Context)
     */
    public void contextualize(Context context) throws ContextException {
        this.workDir = (File) context.get(Constants.CONTEXT_WORK_DIR);
    }
    
    /* (non-Javadoc)
     * @see org.apache.avalon.framework.service.Serviceable#service(org.apache.avalon.framework.service.ServiceManager)
     */
    public void service(ServiceManager manager) throws ServiceException {
        this.manager = manager;
    }

    public void createIndex(String baseURL, boolean create)
    throws ProcessingException {
        LuceneCocoonIndexer lcii = null;
        Analyzer analyzer = LuceneCocoonHelper.getAnalyzer( "org.apache.lucene.analysis.standard.StandardAnalyzer" );
        
        try {
        
            lcii = (LuceneCocoonIndexer)this.manager.lookup( LuceneCocoonIndexer.ROLE );
            Directory directory = LuceneCocoonHelper.getDirectory( new File( workDir, "index" ), create );
            lcii.setAnalyzer( analyzer );
            URL base_url = new URL( baseURL );
            lcii.index( directory, create, base_url );
        } catch (MalformedURLException mue) {
            throw new ProcessingException( "MalformedURLException in createIndex()!", mue );
        } catch (IOException ioe) {
            // ignore ??
            throw new ProcessingException( "IOException in createIndex()!", ioe );
        } catch (ServiceException ce) {
            // ignore ??
            throw new ProcessingException( "ServiceException in createIndex()!", ce );
        } finally {
            this.manager.release( lcii );
        }
    }
    
}