/*
 * Licensed to Elasticsearch under one or more contributor
 * license agreements. See the NOTICE file distributed with
 * this work for additional information regarding copyright
 * ownership. Elasticsearch 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.elasticsearch.index.analysis;

import org.apache.lucene.analysis.TokenStream;
import org.apache.lucene.analysis.icu.ICUFoldingFilter;
import org.elasticsearch.common.inject.Inject;
import org.elasticsearch.common.inject.assistedinject.Assisted;
import org.elasticsearch.common.settings.Settings;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.settings.IndexSettings;

import com.ibm.icu.text.FilteredNormalizer2;
import com.ibm.icu.text.Normalizer2;
import com.ibm.icu.text.UnicodeSet;


/**
 * Uses the {@link org.apache.lucene.analysis.icu.ICUFoldingFilter}. 
 * Applies foldings from UTR#30 Character Foldings.
 * <p>
 * Can be filtered to handle certain characters in a specified way (see http://icu-project.org/apiref/icu4j/com/ibm/icu/text/UnicodeSet.html)
 * E.g national chars that should be retained (filter : "[^åäöÅÄÖ]").
 *
 * <p>The <tt>unicodeSetFilter</tt> attribute can be used to provide the UniCodeSet for filtering.
 *
 * @author kimchy (shay.banon)
 */
public class IcuFoldingTokenFilterFactory extends AbstractTokenFilterFactory {
    private final String unicodeSetFilter;

    @Inject public IcuFoldingTokenFilterFactory(Index index, @IndexSettings Settings indexSettings, @Assisted String name, @Assisted Settings settings) {
        super(index, indexSettings, name, settings);
        this.unicodeSetFilter = settings.get("unicodeSetFilter");
    }

    @Override public TokenStream create(TokenStream tokenStream) {
    	
    	// The ICUFoldingFilter is in fact implemented as a ICUNormalizer2Filter.
    	// ICUFoldingFilter lacks a constructor for adding filtering so we implemement it here
    	if (unicodeSetFilter != null) { 
    		Normalizer2 base = Normalizer2.getInstance(
     		       ICUFoldingFilter.class.getResourceAsStream("utr30.nrm"),
     		       "utr30", Normalizer2.Mode.COMPOSE);
    		UnicodeSet unicodeSet = new UnicodeSet(unicodeSetFilter);

    		unicodeSet.freeze();
    		Normalizer2 filtered = new FilteredNormalizer2(base, unicodeSet);
    		return new org.apache.lucene.analysis.icu.ICUNormalizer2Filter(tokenStream, filtered); 
    	}
    	else {
    		 return new ICUFoldingFilter(tokenStream);
    	}
    }
}

@@ -2264,19 +2264,17 @@
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@@ -2347,17 +2347,20 @@
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@@ -2479,26 +2479,32 @@
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@@ -3037,9 +3037,12 @@
     
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