org.hibernate.search.reader.CacheableMultiReader.java Source code

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Here is the source code for org.hibernate.search.reader.CacheableMultiReader.java

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/*
 * Copyright (C) 2007-2010 Castafiore
 *
 * This program is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Affero General Public License
 * as published by the Free Software Foundation; either version 3
 * of the License, or (at your option) any later version.
 *
 * This program 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 General Public License for more details.
 *
 * You should have received a copy of the GNU General Public License
 * along with this program; if not, see<http://www.gnu.org/licenses/>.
 */
// $Id: CacheableMultiReader.java 14888 2008-07-08 10:26:50Z hardy.ferentschik $
package org.hibernate.search.reader;

import java.io.IOException;

import org.apache.lucene.index.IndexReader;
import org.apache.lucene.index.MultiReader;

/**
 * MultiReader ensuring equals returns true if the underlying readers are the same (and in the same order)
 * Especially useful when using {@link org.apache.lucene.search.CachingWrapperFilter}
 *
 * @author Emmanuel Bernard
 */
public class CacheableMultiReader extends MultiReader {

    // This is package private as the intention of the Lucene team seems to be to not 
    // expose this publically (it's a protected member in Lucene 2.3)
    final IndexReader[] subReaders;

    public CacheableMultiReader(IndexReader[] subReaders) throws IOException {
        super(subReaders);
        this.subReaders = subReaders;
    }

    /**
     * only available since 2.3
     */
    /*
    public CacheableMultiReader(IndexReader[] subReaders, boolean closeSubReaders) {
       super( subReaders, closeSubReaders );
       this.subReaders = subReaders;
    }
     */
    @Override
    public boolean equals(Object obj) {
        if (this == obj)
            return true;
        if (!(obj instanceof CacheableMultiReader))
            return false;
        CacheableMultiReader that = (CacheableMultiReader) obj;
        int length = this.subReaders.length;
        if (length != that.subReaders.length)
            return false;
        for (int index = 0; index < length; index++) {
            if (!this.subReaders[index].equals(that.subReaders[index]))
                return false;
        }
        return true;
    }

    @Override
    public int hashCode() {
        int result = 0;
        for (Object reader : this.subReaders) {
            result = 31 * result + reader.hashCode();
        }
        return result;
    }
}