PathHierarchyTokenizerFactory.java

/*
 * Licensed to ElasticSearch and Shay Banon 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.Tokenizer;
import org.apache.lucene.analysis.path.PathHierarchyTokenizer;
import org.apache.lucene.analysis.path.ReversePathHierarchyTokenizer;
import org.elasticsearch.ElasticSearchIllegalArgumentException;
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 java.io.Reader;

public class PathHierarchyTokenizerFactory extends AbstractTokenizerFactory {

    private final int bufferSize;

    private final char delimiter;
    private final char replacement;
    private final int skip;
    private final boolean reverse;

    @Inject
    public PathHierarchyTokenizerFactory(Index index, @IndexSettings Settings indexSettings, @Assisted String name, @Assisted Settings settings) {
        super(index, indexSettings, name, settings);
        bufferSize = settings.getAsInt("buffer_size", 1024);
        String delimiter = settings.get("delimiter");
        if (delimiter == null) {
            this.delimiter = PathHierarchyTokenizer.DEFAULT_DELIMITER;
        } else if (delimiter.length() > 1) {
            throw new ElasticSearchIllegalArgumentException("delimiter can only be a one char value");
        } else {
            this.delimiter = delimiter.charAt(0);
        }

        String replacement = settings.get("replacement");
        if (replacement == null) {
            this.replacement = this.delimiter;
        } else if (replacement.length() > 1) {
            throw new ElasticSearchIllegalArgumentException("replacement can only be a one char value");
        } else {
            this.replacement = replacement.charAt(0);
        }
        this.skip = settings.getAsInt("skip", PathHierarchyTokenizer.DEFAULT_SKIP);
        this.reverse = settings.getAsBoolean("reverse", false);
    }

    @Override
    public Tokenizer create(Reader reader) {
        if (reverse) {
            return new ReversePathHierarchyTokenizer(reader, bufferSize, delimiter, replacement, skip);
        }
        return new PathHierarchyTokenizer(reader, bufferSize, delimiter, replacement, skip);
    }
}