com.marklogic.contentpump.RDFInputFormat Maven / Gradle / Ivy
/*
* Copyright (c) 2019 MarkLogic Corporation
*
* Licensed 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 com.marklogic.contentpump;
import java.io.IOException;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.apache.hadoop.conf.Configuration;
import org.apache.hadoop.fs.Path;
import org.apache.hadoop.io.DefaultStringifier;
import org.apache.hadoop.io.Text;
import org.apache.hadoop.mapreduce.InputSplit;
import org.apache.hadoop.mapreduce.JobContext;
import org.apache.hadoop.mapreduce.RecordReader;
import org.apache.hadoop.mapreduce.TaskAttemptContext;
import com.marklogic.mapreduce.DocumentURIWithSourceInfo;
import com.marklogic.mapreduce.LinkedMapWritable;
/**
* InputFormat for RDF.
*/
public class RDFInputFormat extends
FileAndDirectoryInputFormat {
public static final Log LOG = LogFactory.getLog(RDFInputFormat.class);
@Override
protected boolean isSplitable(JobContext context, Path filename) {
return false;
}
@Override
public RecordReader createRecordReader(InputSplit is,
TaskAttemptContext context) throws IOException, InterruptedException {
String version = null;
LinkedMapWritable roleMap = null;
try {
version = getServerVersion(context);
roleMap = getRoleMap(context);
} catch (IOException e) {
throw new IOException("Error creating RecordReader:" + e.getMessage());
}
return new RDFReader(version,roleMap);
}
protected LinkedMapWritable getRoleMap(TaskAttemptContext context) throws IOException{
//Restores the object from the configuration.
Configuration conf = context.getConfiguration();
LinkedMapWritable fhmap = null;
if(conf.get(ConfigConstants.CONF_ROLE_MAP)!=null) {
fhmap = DefaultStringifier.load(conf, ConfigConstants.CONF_ROLE_MAP,
LinkedMapWritable.class);
}
return fhmap;
}
protected String getServerVersion(TaskAttemptContext context) throws IOException{
//Restores the object from the configuration.
Configuration conf = context.getConfiguration();
Text version = DefaultStringifier.load(conf, ConfigConstants.CONF_ML_VERSION,
Text.class);
return version.toString();
}
}