/*
* 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.pig.builtin;
import java.io.IOException;
import org.apache.pig.LoadCaster;
import org.apache.pig.PigStreamingBase;
import org.apache.pig.data.WritableByteArray;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.util.StorageUtil;
/**
* The default implementation of {@link PigStreamingBase}.
* It converts tuples into <code>fieldDel</code> separated lines
* and <code>fieldDel</code> separated lines into tuples.
*
*/
public class PigStreaming extends PigStreamingBase {
private byte recordDel = '\n';
private byte fieldDel = '\t';
private WritableByteArray out;
/**
* The constructor that uses the default field delimiter.
*/
public PigStreaming() {
out = new WritableByteArray();
}
/**
* The constructor that accepts a user-specified field
* delimiter.
*
* @param delimiter a <code>String</code> specifying the field
* delimiter.
*/
public PigStreaming(String delimiter) {
this();
fieldDel = StorageUtil.parseFieldDel(delimiter);
}
@Override
public WritableByteArray serializeToBytes(Tuple t) throws IOException {
out.reset();
int sz = t.size();
for (int i=0; i<sz; i++) {
Object field = t.get(i);
StorageUtil.putField(out,field);
if (i == sz - 1) {
// last field in tuple.
out.write(recordDel);
} else {
out.write(fieldDel);
}
}
return out;
}
@Override
public Tuple deserialize(byte[] bytes, int offset, int length) throws IOException {
return StorageUtil.bytesToTuple(bytes, offset, length, fieldDel);
}
@Override
public LoadCaster getLoadCaster() throws IOException {
return new Utf8StorageConverter();
}
}