org.apache.ctakes.core.resource.LuceneIndexReaderResourceImpl.java Source code

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Here is the source code for org.apache.ctakes.core.resource.LuceneIndexReaderResourceImpl.java

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/**
 * 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.ctakes.core.resource;

import java.io.File;

import org.apache.log4j.Logger;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.IOContext;
import org.apache.lucene.store.RAMDirectory;

import org.apache.uima.resource.DataResource;
import org.apache.uima.resource.ResourceInitializationException;
import org.apache.uima.resource.SharedResourceObject;
import org.apache.uima.resource.metadata.ConfigurationParameterSettings;

/**
 * Oct 2010 - convert to lucene 3.0.2
 * @author Mayo Clinic
 */
public class LuceneIndexReaderResourceImpl implements LuceneIndexReaderResource, SharedResourceObject {

    // LOG4J logger based on class name
    private Logger iv_logger = Logger.getLogger(getClass().getName());

    private IndexReader iv_indexReader;

    /**
     * Loads a Lucene index for reading.
     */
    public void load(DataResource dr) throws ResourceInitializationException {

        ConfigurationParameterSettings cps = dr.getMetaData().getConfigurationParameterSettings();
        Boolean useMemoryIndex = (Boolean) cps.getParameterValue("UseMemoryIndex");

        String indexDirStr = (String) cps.getParameterValue("IndexDirectory");
        try {

            File indexDir = FileLocator.locateFile(indexDirStr);

            if (!indexDir.exists())
                iv_logger.info("indexDir=" + indexDirStr + "  does not exist!");
            else
                iv_logger.info("indexDir=" + indexDirStr + "  exists.");

            if (useMemoryIndex.booleanValue()) {

                iv_logger.info("Loading Lucene Index into memory: " + indexDir);
                FSDirectory fsd = FSDirectory.open(indexDir);
                Directory d = new RAMDirectory(fsd, IOContext.DEFAULT);
                iv_indexReader = IndexReader.open(d);
            } else {
                iv_logger.info("Loading Lucene Index: " + indexDir);
                FSDirectory fsd = FSDirectory.open(indexDir);
                iv_indexReader = IndexReader.open(fsd);
            }
            iv_logger.info("Loaded Lucene Index, # docs=" + iv_indexReader.numDocs());
        } catch (Exception e) {
            throw new ResourceInitializationException(e);
        }
    }

    public IndexReader getIndexReader() {
        return iv_indexReader;
    }
}