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/*
 * Copyright 2015 the original author or authors.
 *
 * Licensed 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.gradle.tooling.internal.consumer;

import com.google.common.collect.*;
import org.gradle.api.Transformer;
import org.gradle.tooling.ResultHandler;
import org.gradle.tooling.TestExecutionException;
import org.gradle.tooling.TestLauncher;
import org.gradle.tooling.events.test.TestOperationDescriptor;
import org.gradle.tooling.internal.consumer.async.AsyncConsumerActionExecutor;
import org.gradle.tooling.internal.consumer.connection.ConsumerAction;
import org.gradle.tooling.internal.consumer.connection.ConsumerConnection;
import org.gradle.tooling.internal.consumer.parameters.ConsumerOperationParameters;
import org.gradle.tooling.internal.protocol.test.InternalJvmTestRequest;
import org.gradle.util.CollectionUtils;

import java.util.*;

public class DefaultTestLauncher extends AbstractLongRunningOperation implements TestLauncher {

    private final AsyncConsumerActionExecutor connection;
    private final Set operationDescriptors = new LinkedHashSet();
    private final Set testClassNames = new LinkedHashSet();
    private final Set internalJvmTestRequests = new LinkedHashSet();

    public DefaultTestLauncher(AsyncConsumerActionExecutor connection, ConnectionParameters parameters) {
        super(parameters);
        operationParamsBuilder.setTasks(Collections.emptyList());
        operationParamsBuilder.setEntryPoint("TestLauncher API");
        this.connection = connection;
    }

    @Override
    protected DefaultTestLauncher getThis() {
        return this;
    }

    @Override
    public TestLauncher withTests(TestOperationDescriptor... testDescriptors) {
        withTests(Arrays.asList(testDescriptors));
        return this;
    }

    @Override
    public TestLauncher withTests(Iterable descriptors) {
        operationDescriptors.addAll(CollectionUtils.toList(descriptors));
        return this;
    }

    @Override
    public TestLauncher withJvmTestClasses(String... classNames) {
        withJvmTestClasses(Arrays.asList(classNames));
        return this;
    }

    @Override
    public TestLauncher withJvmTestClasses(Iterable testClasses) {
        List newRequests = CollectionUtils.collect(testClasses, new Transformer() {
            @Override
            public InternalJvmTestRequest transform(String testClass) {
                return new DefaultInternalJvmTestRequest(testClass, null);
            }
        });
        internalJvmTestRequests.addAll(newRequests);
        testClassNames.addAll(CollectionUtils.toList(testClasses));
        return this;
    }

    @Override
    public TestLauncher withJvmTestMethods(String testClass, String... methods) {
        withJvmTestMethods(testClass, Arrays.asList(methods));
        return this;
    }

    @Override
    public TestLauncher withJvmTestMethods(final String testClass, Iterable methods) {
        List newRequests = CollectionUtils.collect(methods, new Transformer() {
            @Override
            public InternalJvmTestRequest transform(String methodName) {
                return new DefaultInternalJvmTestRequest(testClass, methodName);
            }
        });
        this.internalJvmTestRequests.addAll(newRequests);
        this.testClassNames.add(testClass);
        return this;
    }

    public void run() {
        BlockingResultHandler handler = new BlockingResultHandler(Void.class);
        run(handler);
        handler.getResult();
    }

    public void run(final ResultHandler handler) {
        if (operationDescriptors.isEmpty() && internalJvmTestRequests.isEmpty()) {
            throw new TestExecutionException("No test declared for execution.");
        }
        final ConsumerOperationParameters operationParameters = getConsumerOperationParameters();
        final TestExecutionRequest testExecutionRequest = new TestExecutionRequest(operationDescriptors, ImmutableList.copyOf(testClassNames), ImmutableSet.copyOf(internalJvmTestRequests));
        connection.run(new ConsumerAction() {
            public ConsumerOperationParameters getParameters() {
                return operationParameters;
            }

            public Void run(ConsumerConnection connection) {
                connection.runTests(testExecutionRequest, getParameters());
                return null;
            }
        }, new ResultHandlerAdapter(handler));
    }

    private class ResultHandlerAdapter extends org.gradle.tooling.internal.consumer.ResultHandlerAdapter {
        public ResultHandlerAdapter(ResultHandler handler) {
            super(handler, new ExceptionTransformer(new Transformer() {
                @Override
                public String transform(Throwable throwable) {
                    return String.format("Could not execute tests using %s.", connection.getDisplayName());
                }
            }));
        }
    }
}