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* Licensed to Elasticsearch 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.hadoop.cascading;
import org.elasticsearch.hadoop.mr.WritableBytesConverter;
import org.elasticsearch.hadoop.util.Assert;
import org.elasticsearch.hadoop.util.BytesArray;
import cascading.scheme.SinkCall;
import cascading.tuple.Tuple;
public class CascadingLocalBytesConverter extends WritableBytesConverter {
@Override
public void convert(Object from, BytesArray to) {
// expect a tuple holding one field - chararray or bytearray
Assert.isTrue(from instanceof SinkCall,
String.format("Unexpected object type, expecting [%s], given [%s]", SinkCall.class, from.getClass()));
// handle common cases
SinkCall sinkCall = (SinkCall) from;
Tuple rawTuple = sinkCall.getOutgoingEntry().getTuple();
if (rawTuple == null || rawTuple.isEmpty()) {
to.bytes("{}");
return;
}
Assert.isTrue(rawTuple.size() == 1, "When using JSON input, only one field is expected");
// postpone the coercion
Tuple tuple = CascadingUtils.coerceToString(sinkCall);
super.convert(tuple.getObject(0), to);
}
}