/*
* 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 org.apache.pig.EvalFunc;
import java.util.Iterator;
import org.apache.pig.data.DataBag;
import org.apache.pig.data.DataType;
import org.apache.pig.data.DefaultBagFactory;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import java.util.HashMap;
import org.apache.pig.PigException;
import org.apache.pig.backend.executionengine.ExecException;
public class TOMAP extends EvalFunc<HashMap<String,Object>> {
@Override
public HashMap<String, Object> exec(Tuple input) throws IOException {
try {
HashMap<String, Object> map = new HashMap<String, Object>();
if ( input == null || input.size()== 0) {
return map; //an empty map
}
for (int i = 0; i < input.size(); i=i+2) {
String key= input.get(i).toString();
if ( null!=key && ( i+1 < input.size() )) {
map.put( key , input.get(i+1));
}
}
return map;
} catch (Exception e) {
int errCode = 2106;
String msg = "Error while creating map with" + this.getClass().getSimpleName();
throw new ExecException(msg, errCode, PigException.BUG, e);
}
}
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema(null, DataType.MAP));
}
}