/*
 * 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.flink.api.common.operators;

import static org.junit.Assert.*;

import java.util.ArrayList;
import java.util.List;

import org.apache.flink.api.common.functions.RichCrossFunction;
import org.apache.flink.api.common.functions.RichMapFunction;
import org.apache.flink.api.java.DataSet;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.io.LocalCollectionOutputFormat;
import org.apache.flink.configuration.Configuration;
import org.junit.Test;

@SuppressWarnings("serial")
public class CollectionExecutionWithBroadcastVariableTest {

	private static final String BC_VAR_NAME = "BC";
	
	private final String[] TEST_DATA = { "A", "B", "C", "D" };
	private final String SUFFIX = "-suffixed";
	
	@Test
	public void testUnaryOp() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.createCollectionsEnvironment();
			
			DataSet<String> bcData = env.fromElements(SUFFIX);
			
			List<String> result = new ArrayList<String>();
			
			env.fromElements(TEST_DATA)
					.map(new SuffixAppender()).withBroadcastSet(bcData, BC_VAR_NAME)
					.output(new LocalCollectionOutputFormat<String>(result));
			
			env.execute();
			
			assertEquals(TEST_DATA.length, result.size());
			for (String s : result) {
				assertTrue(s.indexOf(SUFFIX) > 0);
			}
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
	
	@Test
	public void testBinaryOp() {
		try {
			ExecutionEnvironment env = ExecutionEnvironment.createCollectionsEnvironment();
			
			DataSet<String> bcData = env.fromElements(SUFFIX);
			DataSet<String> inData = env.fromElements(TEST_DATA);
			
			List<String> result = new ArrayList<String>();
			
			inData.cross(inData).with(new SuffixCross()).withBroadcastSet(bcData, BC_VAR_NAME)
					.output(new LocalCollectionOutputFormat<String>(result));
			
			env.execute();
			
			assertEquals(TEST_DATA.length * TEST_DATA.length, result.size());
			for (String s : result) {
				assertTrue(s.indexOf(SUFFIX) == 2);
			}
		}
		catch (Exception e) {
			e.printStackTrace();
			fail(e.getMessage());
		}
	}
	
	public static final class SuffixAppender extends RichMapFunction<String, String> {
		
		private String suffix;
		
		@Override
		public void open(Configuration parameters) {
			suffix = getRuntimeContext().<String>getBroadcastVariable(BC_VAR_NAME).get(0);
		}
		
		@Override
		public String map(String value) {
			return value + suffix;
		}
	}
	
	public static final class SuffixCross extends RichCrossFunction<String, String, String> {
		
		private String suffix;
		
		@Override
		public void open(Configuration parameters) {
			suffix = getRuntimeContext().<String>getBroadcastVariable(BC_VAR_NAME).get(0);
		}
		
		@Override
		public String cross(String s1, String s2) {
			return s1 + s2 + suffix;
		}
	}
}