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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.testkit.runner;

import org.gradle.api.Incubating;

import javax.annotation.Nullable;
import java.util.List;

/**
 * The result of executing a build, via the {@link GradleRunner}.
 *
 * @since 2.6
 * @see GradleRunner#build()
 * @see GradleRunner#buildAndFail()
 */
@Incubating
public interface BuildResult {

    /**
     * The textual output produced during the build.
     * 
     * This is equivalent to the console output produced when running a build from the command line.
     * It contains both the standard output, and standard error output, of the build.
     *
     * @return the build output, or an empty string if there was no build output (e.g. ran with {@code -q})
     * @since 2.9
     */
    String getOutput();

    /**
     * The tasks that were part of the build.
     * 

     * The order of the tasks corresponds to the order in which the tasks were started.
     * If executing a parallel enabled build, the order is not guaranteed to be deterministic.
     * 

     * The returned list is an unmodifiable view of items.
     * The returned list will be empty if no tasks were executed.
     * This can occur if the build fails early, due to a build script failing to compile for example.
     *
     * @return the build tasks
     */
    List getTasks();

    /**
     * The subset of {@link #getTasks()} that had the given outcome.
     * 

     * The returned list is an unmodifiable view of items.
     * The returned list will be empty if no tasks were executed with the given outcome.
     *
     * @param outcome the desired outcome
     * @return the build tasks with the given outcome
     */
    List tasks(TaskOutcome outcome);

    /**
     * The paths of the subset of {@link #getTasks()} that had the given outcome.
     * 
     * The returned list is an unmodifiable view of items.
     * The returned list will be empty if no tasks were executed with the given outcome.
     *
     * @param outcome the desired outcome
     * @return the paths of the build tasks with the given outcome
     */
    List taskPaths(TaskOutcome outcome);

    /**
     * Returns the result object for a particular task, or {@code null} if the given task was not part of the build.
     *
     * @param taskPath the path of the target task
     * @return information about the executed task, or {@code null} if the task was not executed
     */
    @Nullable
    BuildTask task(String taskPath);

}