/*
* 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.EvalFunc;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.data.DataType;
/**
* ABS implements a binding to the Java function
* {@link java.lang.Math#abs(double) Math.abs(int)} for computing the
* absolute value of the argument. The returned value will be an int which is
* absolute value of the input.
*/
public class IntAbs extends EvalFunc<Integer>{
/**
* java level API
* @param input expects a single numeric value
* @return output returns a single numeric value, absolute value of the argument
*/
public Integer exec(Tuple input) throws IOException {
if (input == null || input.size() == 0)
return null;
Integer d;
try{
d = (Integer)input.get(0);
} catch (Exception e){
throw new IOException("Caught exception processing input row ", e);
}
return Math.abs(d);
}
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema(getSchemaName(this.getClass().getName().toLowerCase(), input), DataType.INTEGER));
}
}