test/org/apache/pig/test/utils/Identity.java

/*
 * 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.utils;

import org.apache.pig.EvalFunc;
import org.apache.pig.data.DataType;
import org.apache.pig.data.Tuple;
import org.apache.pig.impl.logicalLayer.FrontendException;
import org.apache.pig.impl.logicalLayer.schema.Schema;


/**
 * Returns the input
 */
public class Identity extends EvalFunc<Tuple> {

    @Override
    public Tuple exec(Tuple input) {
        return input;
    }

    @Override
    public Schema outputSchema(Schema input) {
        try {
            return new Schema(new Schema.FieldSchema(null, input, DataType.TUPLE));
        } catch (FrontendException e) {
            throw new RuntimeException(e);
        }
    }
}