biospectra.utils.IndexUtil.java Source code

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Here is the source code for biospectra.utils.IndexUtil.java

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/*
 * Copyright 2015 iychoi.
 *
 * Licensed 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 biospectra.utils;

import java.io.Closeable;
import java.io.File;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.lucene.index.DirectoryReader;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.store.Directory;
import org.apache.lucene.store.MMapDirectory;

/**
 *
 * @author iychoi
 */
public class IndexUtil implements Closeable {
    private static final Log LOG = LogFactory.getLog(IndexUtil.class);

    private File indexPath;
    private IndexReader indexReader;

    public IndexUtil(String indexPath) throws Exception {
        if (indexPath == null) {
            throw new IllegalArgumentException("indexPath is null");
        }

        initialize(new File(indexPath));
    }

    public IndexUtil(File indexPath) throws Exception {
        initialize(indexPath);
    }

    private void initialize(File indexPath) throws Exception {
        if (indexPath == null) {
            throw new IllegalArgumentException("indexPath is null");
        }

        this.indexPath = indexPath;
        Directory dir = new MMapDirectory(this.indexPath.toPath());
        this.indexReader = DirectoryReader.open(dir);
    }

    public int countDocs() throws Exception {
        return this.indexReader.numDocs();
    }

    @Override
    public void close() throws IOException {
        this.indexReader.close();
    }
}