/*
* 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.test.udf.evalfunc;
import java.io.IOException;
import java.util.Iterator;
import org.apache.pig.Accumulator;
import org.apache.pig.EvalFunc;
import org.apache.pig.PigException;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.Tuple;
public class AllFirstLetter extends EvalFunc<String> implements Accumulator<String>
{
// @Override
public String exec(Tuple input) throws IOException {
result = "";
DataBag bag = (DataBag) input.get(0);
Iterator<Tuple> it = bag.iterator();
while (it.hasNext()) {
Tuple t = it.next();
if (t != null && t.size() > 0 && t.get(0) != null)
result += t.get(0).toString().substring(0, 1);
}
return result;
}
/* Accumulator interface implementation */
String result = "";
@Override
public void accumulate(Tuple b) throws IOException {
try {
DataBag bag = (DataBag) b.get(0);
Iterator it = bag.iterator();
while (it.hasNext()) {
Tuple t = (Tuple) it.next();
if (t != null && t.size() > 0 && t.get(0) != null) {
result += t.get(0).toString().substring(0, 1);
}
}
} catch (ExecException ee) {
throw ee;
} catch (Exception e) {
int errCode = 2106;
String msg = "Error while computing AllFirstLetter in "
+ this.getClass().getSimpleName();
throw new ExecException(msg, errCode, PigException.BUG, e);
}
}
@Override
public void cleanup() {
result = "";
}
@Override
public String getValue() {
return result;
}
}