/*
* 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.PigWarning;
import org.apache.pig.data.Tuple;
import org.apache.pig.data.DataType;
import org.apache.pig.impl.logicalLayer.schema.Schema;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.FuncSpec;
/**
* UUID implements Java's UUID.randomUUID(). Any arguments to the function
* ignored.
* Example:
* A = load 'mydata' as (name);
* B = foreach A generate name, UUID();
*/
public class UUID extends EvalFunc<String> {
/**
* @param input tuple; ignored
* @return A unique identifier
* @exception IOException
*/
public String exec(Tuple input) throws IOException {
return java.util.UUID.randomUUID().toString();
}
/**
* This method gives a name to the column.
* @param input - schema of the input data
* @return schema of the input data
*/
@Override
public Schema outputSchema(Schema input) {
return new Schema(new Schema.FieldSchema("uuid", DataType.CHARARRAY));
}
}