org.apache.pig.builtin.STRSPLIT Maven / Gradle / Ivy
/*
* 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 java.util.Arrays;
import java.util.regex.PatternSyntaxException;
import org.apache.pig.EvalFunc;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.TupleFactory;
/**
* Wrapper around Java's String.split
* input tuple: first column is assumed to have a string to split;
* the optional second column is assumed to have the delimiter or regex to split on;
* if not provided, it's assumed to be '\s' (space)
* the optional third column may provide a limit to the number of results.
* If limit is not provided, 0 is assumed, as per Java's split().
*/
public class STRSPLIT extends EvalFunc {
private final static TupleFactory tupleFactory = TupleFactory.getInstance();
/**
* Wrapper around Java's String.split
* @param input tuple; first column is assumed to have a string to split;
* the optional second column is assumed to have the delimiter or regex to split on;
* if not provided, it's assumed to be '\s' (space)
* the optional third column may provide a limit to the number of results.
* If limit is not provided, 0 is assumed, as per Java's split().
* @exception java.io.IOException
*/
public Tuple exec(Tuple input) throws IOException {
if (input == null || input.size() < 1)
return null;
try {
String source = (String) input.get(0);
String delim = (input.size() > 1 ) ? (String) input.get(1) : "\\s";
int length = (input.size() > 2) ? (Integer) input.get(2) : 0;
if (source == null || delim == null) {
return null;
}
String[] splits = source.split(delim, length);
return tupleFactory.newTuple(Arrays.asList(splits));
} catch (ClassCastException e) {
log.warn("class cast exception at "+e.getStackTrace()[0]);
} catch (PatternSyntaxException e) {
log.warn(e.getMessage());
}
// this only happens if the try block did not complete normally
return null;
}
}