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/*
* 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.sysml.runtime.matrix.data.hadoopfix;
import java.io.DataInput;
import java.io.DataOutput;
import java.io.IOException;
import org.apache.hadoop.conf.Configurable;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapred.InputFormat;
import org.apache.hadoop.mapred.InputSplit;
import org.apache.hadoop.mapred.Mapper;
import org.apache.hadoop.util.ReflectionUtils;
/**
* An {@link InputSplit} that tags another InputSplit with extra data for use by
* {@link DelegatingInputFormat}s and {@link DelegatingMapper}s.
*/
@SuppressWarnings("rawtypes")
class TaggedInputSplit implements Configurable, InputSplit {
private Class inputSplitClass;
private InputSplit inputSplit;
private Class inputFormatClass;
private Class mapperClass;
private Configuration conf;
public TaggedInputSplit() {
// Default constructor.
}
/**
* Creates a new TaggedInputSplit.
*
* @param inputSplit The InputSplit to be tagged
* @param conf The configuration to use
* @param inputFormatClass The InputFormat class to use for this job
* @param mapperClass The Mapper class to use for this job
*/
public TaggedInputSplit(InputSplit inputSplit, Configuration conf,
Class inputFormatClass,
Class mapperClass) {
this.inputSplitClass = inputSplit.getClass();
this.inputSplit = inputSplit;
this.conf = conf;
this.inputFormatClass = inputFormatClass;
this.mapperClass = mapperClass;
}
/**
* Retrieves the original InputSplit.
*
* @return The InputSplit that was tagged
*/
public InputSplit getInputSplit() {
return inputSplit;
}
/**
* Retrieves the InputFormat class to use for this split.
*
* @return The InputFormat class to use
*/
public Class getInputFormatClass() {
return inputFormatClass;
}
/**
* Retrieves the Mapper class to use for this split.
*
* @return The Mapper class to use
*/
public Class getMapperClass() {
return mapperClass;
}
public long getLength() throws IOException {
return inputSplit.getLength();
}
public String[] getLocations() throws IOException {
return inputSplit.getLocations();
}
@SuppressWarnings("unchecked")
public void readFields(DataInput in) throws IOException {
inputSplitClass = (Class) readClass(in);
inputSplit = (InputSplit) ReflectionUtils
.newInstance(inputSplitClass, conf);
inputSplit.readFields(in);
inputFormatClass = (Class) readClass(in);
mapperClass = (Class) readClass(in);
}
private Class readClass(DataInput in) throws IOException {
String className = Text.readString(in);
try {
return conf.getClassByName(className);
} catch (ClassNotFoundException e) {
throw new RuntimeException("readObject can't find class", e);
}
}
public void write(DataOutput out) throws IOException {
Text.writeString(out, inputSplitClass.getName());
inputSplit.write(out);
Text.writeString(out, inputFormatClass.getName());
Text.writeString(out, mapperClass.getName());
}
public Configuration getConf() {
return conf;
}
public void setConf(Configuration conf) {
this.conf = conf;
}
}