com.jaeksoft.searchlib.cache.SpellCheckerCache.java Source code

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Here is the source code for com.jaeksoft.searchlib.cache.SpellCheckerCache.java

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/**   
 * License Agreement for OpenSearchServer
 *
 * Copyright (C) 2008-2011 Emmanuel Keller / Jaeksoft
 * 
 * http://www.open-search-server.com
 * 
 * This file is part of OpenSearchServer.
 *
 * OpenSearchServer is free software: you can redistribute it and/or
 * modify it under the terms of the GNU General Public License as published by
 * the Free Software Foundation, either version 3 of the License, or
 *  (at your option) any later version.
 *
 * OpenSearchServer 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 OpenSearchServer. 
 *  If not, see <http://www.gnu.org/licenses/>.
 **/

package com.jaeksoft.searchlib.cache;

import java.io.IOException;

import org.apache.lucene.index.IndexWriterConfig;
import org.apache.lucene.search.spell.LuceneDictionary;
import org.apache.lucene.search.spell.SpellChecker;
import org.apache.lucene.store.RAMDirectory;
import org.apache.lucene.util.Version;

import com.jaeksoft.searchlib.index.ReaderLocal;

public class SpellCheckerCache extends LRUCache<FieldNameKey, SpellChecker> {

    public SpellCheckerCache(int maxSize) {
        super("Spellchecker cache", maxSize);
    }

    public SpellChecker get(ReaderLocal reader, String field) throws IOException {
        rwl.w.lock();
        try {
            FieldNameKey key = new FieldNameKey(field);
            SpellChecker spellChecker = getAndPromote(key);
            if (spellChecker != null)
                return spellChecker;
            LuceneDictionary dict = reader.getLuceneDirectionary(key.getFieldName());
            SpellChecker spellchecker = new SpellChecker(new RAMDirectory());
            spellchecker.indexDictionary(dict, new IndexWriterConfig(Version.LUCENE_36, null), true);

            put(key, spellchecker);
            return spellchecker;
        } finally {
            rwl.w.unlock();
        }
    }

}