/*
* 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.piggybank.evaluation.string;
import java.io.IOException;
import org.apache.pig.data.Tuple;
/**
* <dl>
* Implementation for HashFNV which takes 2 parameter
* </dl>
*/
public class HashFNV2 extends HashFNV {
int mMod=-1;
@Override
public Long exec(Tuple input) throws IOException {
if (input.size()!=2) {
String msg = "HashFNV : Only 2 parameters are allowed.";
throw new IOException(msg);
}
if (input.get(0)==null)
return null;
try {
mMod = (Integer)input.get(1);
} catch (ClassCastException e) {
throw new IOException("HashFNV : 2nd parameter is not Integer",e);
}
long v = hashFnv32((String)input.get(0));
if (v < 0)
v = -v;
if (mMod > 0)
{
v %= mMod;
}
return v;
}
}