branch-0.23.1/hadoop-hdfs-project/hadoop-hdfs/src/main/java/org/apache/hadoop/hdfs/tools/offlineEditsViewer/TokenizerFactory.java

/**
 * 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.apache.hadoop.hdfs.tools.offlineEditsViewer;

import java.io.IOException;
import org.apache.hadoop.classification.InterfaceAudience;
import org.apache.hadoop.classification.InterfaceStability;

/**
 * TokenizerFactory for different implementations of Tokenizer
 *
 */
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class TokenizerFactory {

  /**
   * Factory function that creates a Tokenizer object, the input format
   * is set based on filename (*.xml is XML, otherwise binary)
   *
   * @param filename input filename
   */
  static public Tokenizer getTokenizer(String filename) throws IOException {
    if(filename.toLowerCase().endsWith("xml")) {
      return new XmlTokenizer(filename);
    } else {
      return new BinaryTokenizer(filename);
    }
  }

}