SerializableStreamAssets.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 io.dstream;

import java.io.Serializable;
import java.util.Comparator;
import java.util.Objects;
import java.util.function.BiFunction;
import java.util.function.BinaryOperator;
import java.util.function.Consumer;
import java.util.function.Function;
import java.util.function.Predicate;
import java.util.function.Supplier;
import java.util.stream.Stream;
/**
 * Defines {@link Serializable} equivalents to strategies used by the {@link Stream} API.
 */
public interface SerializableStreamAssets {
	
	/**
	 * {@link Serializable} version of {@link Function}
	 */
	public static interface SerFunction<T,R> extends Function<T, R>, Serializable{
		default <V> SerFunction<V, R> compose(SerFunction<? super V, ? extends T> before) {
	        Objects.requireNonNull(before);
	        return new SerFunction<V, R>() {
				private static final long serialVersionUID = -8429315342325486066L;
				@Override
				public R apply(V t) {
					return (R) SerFunction.this.apply((T) before.apply(t));
				}	
	        };
	    }
			
		default <V> SerFunction<T, V> andThen(SerFunction<? super R, ? extends V> after) {
	        Objects.requireNonNull(after);
	        return new SerFunction<T,V>() {
				private static final long serialVersionUID = -559880927330709790L;
				@Override
				public V apply(T t) {
					return after.apply(SerFunction.this.apply(t));
				}	
	        };
	    }
	}
	
	/**
	 * {@link Serializable} version of {@link BinaryOperator}
	 */
	public static interface SerBinaryOperator<T> extends BinaryOperator<T>, Serializable {}
	
	/**
	 * {@link Serializable} version of {@link Supplier}
	 */
	public static interface SerSupplier<T> extends Supplier<T>, Serializable{}
	
	/**
	 * {@link Serializable} version of {@link BiFunction}
	 */
	public static interface SerBiFunction<T, U, R> extends BiFunction<T, U, R>, Serializable{}
	
	/**
	 * {@link Serializable} version of {@link Predicate}
	 */
	public static interface SerPredicate<T> extends Predicate<T>, Serializable{}
	
	/**
	 * {@link Serializable} version of {@link Comparator}
	 */
	public static interface SerComparator<T> extends Comparator<T>, Serializable{}

	/**
	 * {@link Serializable} version of {@link Consumer}
	 */
	public static interface SerConsumer<T> extends Consumer<T>, Serializable{}
}