org.genemania.completion.lucene.IndexBuilder.java Source code

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Here is the source code for org.genemania.completion.lucene.IndexBuilder.java

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/**
 * This file is part of GeneMANIA.
 * Copyright (C) 2010 University of Toronto.
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301  USA
 */

package org.genemania.completion.lucene;

import java.io.File;
import java.io.IOException;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.IndexWriter;
import org.apache.lucene.index.IndexWriter.MaxFieldLength;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.FSDirectory;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;
import org.genemania.exception.ApplicationException;
import org.genemania.util.ProgressReporter;

public abstract class IndexBuilder {
    protected Analyzer createAnalyzer() {
        return new StandardAnalyzer(Version.LUCENE_29);
    }

    void write(String path, Directory source, Analyzer analyzer, MaxFieldLength length) throws IOException {
        FSDirectory directory = FSDirectory.open(new File(path));
        try {
            IndexReader reader = IndexReader.open(source, true);
            try {
                IndexWriter writer = new IndexWriter(directory, analyzer, length);
                try {
                    writer.addIndexes(new IndexReader[] { reader });
                } finally {
                    writer.close();
                }
            } finally {
                reader.close();
            }
        } finally {
            directory.close();
        }
    }

    protected void createIndex(String indexPath, Analyzer analyzer, ProgressReporter progress)
            throws ApplicationException {
        try {
            RAMDirectory directory = new RAMDirectory();
            IndexWriter writer = new IndexWriter(directory, analyzer, MaxFieldLength.LIMITED);
            try {
                createIndex(writer, progress);
            } finally {
                writer.close();
            }
            if (progress.isCanceled()) {
                return;
            }
            write(indexPath, directory, analyzer, MaxFieldLength.LIMITED);
        } catch (IOException e) {
            throw new ApplicationException(e);
        }
    }

    protected abstract void createIndex(IndexWriter writer, ProgressReporter progress) throws ApplicationException;
}