| /* |
| * 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.wayang.java.compiler; |
| |
| import java.util.function.BinaryOperator; |
| import java.util.function.Function; |
| import java.util.function.Predicate; |
| import org.apache.wayang.core.api.Configuration; |
| import org.apache.wayang.core.function.FlatMapDescriptor; |
| import org.apache.wayang.core.function.MapPartitionsDescriptor; |
| import org.apache.wayang.core.function.PredicateDescriptor; |
| import org.apache.wayang.core.function.ReduceDescriptor; |
| import org.apache.wayang.core.function.TransformationDescriptor; |
| |
| /** |
| * A compiler translates Wayang functions into executable Java functions. |
| */ |
| public class FunctionCompiler { |
| |
| private final Configuration configuration; |
| |
| public FunctionCompiler(Configuration configuration) { |
| this.configuration = configuration; |
| } |
| |
| /** |
| * Compile a transformation. |
| * |
| * @param descriptor describes the transformation |
| * @param <I> input type of the transformation |
| * @param <O> output type of the transformation |
| * @return a compiled function |
| */ |
| public <I, O> Function<I, O> compile(TransformationDescriptor<I, O> descriptor) { |
| // This is a dummy method but shows the intention of having something compilable in the descriptors. |
| return descriptor.getJavaImplementation(); |
| } |
| |
| /** |
| * Compile a partition transformation. |
| * |
| * @param descriptor describes the transformation |
| * @param <I> input type of the transformation |
| * @param <O> output type of the transformation |
| * @return a compiled function |
| */ |
| public <I, O> Function<Iterable<I>, Iterable<O>> compile(MapPartitionsDescriptor<I, O> descriptor) { |
| // This is a dummy method but shows the intention of having something compilable in the descriptors. |
| return descriptor.getJavaImplementation(); |
| } |
| |
| /** |
| * Compile a transformation. |
| * |
| * @param descriptor describes the transformation |
| * @param <I> input type of the transformation |
| * @param <O> output type of the transformation |
| * @return a compiled function |
| */ |
| public <I, O> Function<I, Iterable<O>> compile(FlatMapDescriptor<I, O> descriptor) { |
| return descriptor.getJavaImplementation(); |
| } |
| |
| /** |
| * Compile a reduction. |
| * |
| * @param descriptor describes the transformation |
| * @param <Type> input/output type of the transformation |
| * @return a compiled function |
| */ |
| public <Type> BinaryOperator<Type> compile(ReduceDescriptor<Type> descriptor) { |
| // This is a dummy method but shows the intention of having something compilable in the descriptors. |
| return descriptor.getJavaImplementation(); |
| } |
| |
| public <Type> Predicate<Type> compile(PredicateDescriptor<Type> predicateDescriptor) { |
| return predicateDescriptor.getJavaImplementation(); |
| } |
| |
| public Configuration getConfiguration() { |
| return this.configuration; |
| } |
| } |