/**
* 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;
/**
* EditsVisitorFactory for different implementations of EditsVisitor
*
*/
@InterfaceAudience.Private
@InterfaceStability.Unstable
public class EditsVisitorFactory {
/**
* Factory function that creates an EditsVisitor object
*
* @param filename output filename
* @param tokenizer input tokenizer
* @return EditsVisitor for appropriate output format (binary, XML etc.)
*/
static public EditsVisitor getEditsVisitor(String filename,
String processor,
Tokenizer tokenizer,
boolean printToScreen) throws IOException {
if(processor.toLowerCase().equals("xml")) {
return new XmlEditsVisitor(filename, tokenizer, printToScreen);
} else if(processor.toLowerCase().equals("stats")) {
return new StatisticsEditsVisitor(filename, tokenizer, printToScreen);
} else if(processor.toLowerCase().equals("binary")) {
return new BinaryEditsVisitor(filename, tokenizer, printToScreen);
} else {
throw new IOException("Unknown proccesor " + processor +
" (valid processors: xml, binary, stats)");
}
}
}