/*
 * 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.exoplatform.services.jcr.impl.core.query.lucene;

import org.apache.lucene.analysis.Analyzer;
import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.standard.StandardAnalyzer;
import org.apache.lucene.util.Version;
import org.exoplatform.commons.utils.SecurityHelper;

import java.io.Reader;
import java.security.PrivilegedAction;
import java.util.Set;

/**
 * This is the global jackrabbit lucene analyzer. By default, all
 * properties are indexed with the <code>StandardAnalyzer(new String[]{})</code>,
 * unless in the SearchIndex configuration a global analyzer is defined.
 *
 * In the indexing configuration, properties can be configured to be
 * indexed with a specific analyzer. If configured, this analyzer is used to
 * index the text of the property and to parse searchtext for this property.
 */

public final class JcrStandartAnalyzer extends Analyzer
{

   /**
    * The default Jackrabbit analyzer if none is configured in <code><SearchIndex></code>
    * configuration.
    */
   private Analyzer defaultAnalyzer = SecurityHelper.doPrivilegedAction(new PrivilegedAction<Analyzer>()
   {
      public Analyzer run()
      {
         return new StandardAnalyzer(Version.LUCENE_30, (Set<?>)null);
      }
   });

   /**
    * The indexing configuration.
    */
   private IndexingConfiguration indexingConfig;

   /**
    * A param indexingConfig the indexing configuration.
    */
   protected void setIndexingConfig(IndexingConfiguration indexingConfig)
   {
      this.indexingConfig = indexingConfig;
   }

   /**
    * @param analyzer the default jackrabbit analyzer
    */
   protected void setDefaultAnalyzer(Analyzer analyzer)
   {
      defaultAnalyzer = analyzer;
   }

   /**
    * Creates a TokenStream which tokenizes all the text in the provided
    * Reader. If the fieldName (property) is configured to have a different
    * analyzer than the default, this analyzer is used for tokenization
    */
   @Override
   public TokenStream tokenStream(String fieldName, Reader reader)
   {
      if (indexingConfig != null)
      {
         Analyzer propertyAnalyzer = indexingConfig.getPropertyAnalyzer(fieldName);
         if (propertyAnalyzer != null)
         {
            return propertyAnalyzer.tokenStream(fieldName, reader);
         }
      }
      return defaultAnalyzer.tokenStream(fieldName, reader);
   }

}