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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.flink.test.util;

import org.apache.flink.api.common.JobExecutionResult;
import org.apache.flink.api.java.CollectionEnvironment;
import org.apache.flink.api.java.ExecutionEnvironment;
import org.apache.flink.api.java.ExecutionEnvironmentFactory;

/**
 * A {@link CollectionEnvironment} to be used in tests. The predominant feature of this class is
 * that it allows setting it as a context environment, causing it to be returned by {@link
 * ExecutionEnvironment#getExecutionEnvironment()}. This also allows retrieving the {@link
 * JobExecutionResult} outside the actual program.
 */
public class CollectionTestEnvironment extends CollectionEnvironment {

    private CollectionTestEnvironment lastEnv = null;

    @Override
    public JobExecutionResult getLastJobExecutionResult() {
        if (lastEnv == null) {
            return this.lastJobExecutionResult;
        } else {
            return lastEnv.getLastJobExecutionResult();
        }
    }

    @Override
    public JobExecutionResult execute(String jobName) throws Exception {
        JobExecutionResult result = super.execute(jobName);
        this.lastJobExecutionResult = result;
        return result;
    }

    protected void setAsContext() {
        ExecutionEnvironmentFactory factory =
                new ExecutionEnvironmentFactory() {
                    @Override
                    public ExecutionEnvironment createExecutionEnvironment() {
                        lastEnv = new CollectionTestEnvironment();
                        return lastEnv;
                    }
                };

        initializeContextEnvironment(factory);
    }

    protected static void unsetAsContext() {
        resetContextEnvironment();
    }
}