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/*
* 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.spark.api.java.function;
import scala.Tuple2;
import scala.reflect.ClassManifest;
import scala.reflect.ClassManifest$;
import scala.runtime.AbstractFunction1;
import java.io.Serializable;
/**
* A function that returns key-value pairs (Tuple2<K, V>), and can be used to construct PairRDDs.
*/
// PairFunction does not extend Function because some UDF functions, like map,
// are overloaded for both Function and PairFunction.
public abstract class PairFunction<T, K, V>
extends WrappedFunction1<T, Tuple2<K, V>>
implements Serializable {
public abstract Tuple2<K, V> call(T t) throws Exception;
public ClassManifest<K> keyType() {
return (ClassManifest<K>) ClassManifest$.MODULE$.fromClass(Object.class);
}
public ClassManifest<V> valueType() {
return (ClassManifest<V>) ClassManifest$.MODULE$.fromClass(Object.class);
}
}
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