org.apache.pig.builtin.RTRIM 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.List;
import java.util.ArrayList;
import org.apache.pig.EvalFunc;
import org.apache.pig.PigWarning;
import org.apache.pig.backend.executionengine.ExecException;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.FuncSpec;
import org.apache.pig.impl.logicalLayer.FrontendException;
/**
* Returns a string, with only tailing whitespace omitted.
* Implements a binding to the Java function {@link java.lang.String#trim() String.trim()}.
*/
public class RTRIM extends EvalFunc {
@Override
public String exec(Tuple input) throws IOException {
if (input == null || input.size() == 0) {
return null;
}
try {
String str = (String) input.get(0);
if (str == null) return null;
if (str.length() == 0) return str;
return str.replaceFirst(" +$", "");
} catch (ExecException e) {
warn("Error reading input: " + e.getMessage(), PigWarning.UDF_WARNING_1);
return null;
}
}
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema(null, DataType.CHARARRAY));
}
/* (non-Javadoc)
* @see org.apache.pig.EvalFunc#getArgToFuncMapping()
*/
@Override
public List getArgToFuncMapping() throws FrontendException {
List funcList = new ArrayList();
funcList.add(new FuncSpec(this.getClass().getName(), new Schema(new Schema.FieldSchema(null, DataType.CHARARRAY))));
return funcList;
}
@Override
public boolean allowCompileTimeCalculation() {
return true;
}
}