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/*
 * Licensed to Elastic Search and Shay Banon under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Elastic Search 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.StopAnalyzer;
import org.apache.lucene.util.Version;
import org.elasticsearch.index.Index;
import org.elasticsearch.index.settings.IndexSettings;
import org.elasticsearch.util.collect.ImmutableSet;
import org.elasticsearch.util.collect.Iterators;
import org.elasticsearch.util.inject.Inject;
import org.elasticsearch.util.inject.assistedinject.Assisted;
import org.elasticsearch.util.settings.Settings;

import java.util.Set;

/**
 * @author kimchy (Shay Banon)
 */
public class StopAnalyzerProvider extends AbstractAnalyzerProvider {

    private final Set stopWords;

    private final StopAnalyzer stopAnalyzer;

    @Inject public StopAnalyzerProvider(Index index, @IndexSettings Settings indexSettings, @Assisted String name, @Assisted Settings settings) {
        super(index, indexSettings, name);
        String[] stopWords = settings.getAsArray("stopwords");
        if (stopWords.length > 0) {
            this.stopWords = ImmutableSet.copyOf(Iterators.forArray(stopWords));
        } else {
            this.stopWords = ImmutableSet.copyOf((Iterable) StopAnalyzer.ENGLISH_STOP_WORDS_SET);
        }
        this.stopAnalyzer = new StopAnalyzer(Version.LUCENE_CURRENT, this.stopWords);
    }

    @Override public StopAnalyzer get() {
        return this.stopAnalyzer;
    }
}