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/*
 * Copyright 2016 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.composite.internal;

import com.google.common.collect.Sets;
import org.gradle.StartParameter;
import org.gradle.api.InvalidUserDataException;
import org.gradle.api.initialization.Settings;
import org.gradle.api.internal.SettingsInternal;
import org.gradle.api.internal.artifacts.ImmutableModuleIdentifierFactory;
import org.gradle.api.initialization.ConfigurableIncludedBuild;
import org.gradle.api.initialization.IncludedBuild;
import org.gradle.initialization.GradleLauncher;
import org.gradle.initialization.NestedBuildFactory;
import org.gradle.internal.Factory;
import org.gradle.internal.concurrent.CompositeStoppable;
import org.gradle.internal.concurrent.Stoppable;
import org.gradle.internal.reflect.Instantiator;
import org.gradle.internal.work.WorkerLeaseService;

import java.io.File;
import java.util.Set;

public class DefaultIncludedBuildFactory implements IncludedBuildFactory, Stoppable {
    private final Instantiator instantiator;
    private final StartParameter startParameter;
    private final NestedBuildFactory nestedBuildFactory;
    private final Set launchers = Sets.newHashSet();
    private final ImmutableModuleIdentifierFactory moduleIdentifierFactory;
    private final WorkerLeaseService workerLeaseService;

    public DefaultIncludedBuildFactory(Instantiator instantiator, StartParameter startParameter, NestedBuildFactory nestedBuildFactory, ImmutableModuleIdentifierFactory moduleIdentifierFactory, WorkerLeaseService workerLeaseService) {
        this.instantiator = instantiator;
        this.startParameter = startParameter;
        this.nestedBuildFactory = nestedBuildFactory;
        this.moduleIdentifierFactory = moduleIdentifierFactory;
        this.workerLeaseService = workerLeaseService;
    }

    private void validateBuildDirectory(File dir) {
        if (!dir.exists()) {
            throw new InvalidUserDataException(String.format("Included build '%s' does not exist.", dir));
        }
        if (!dir.isDirectory()) {
            throw new InvalidUserDataException(String.format("Included build '%s' is not a directory.", dir));
        }
    }

    private void validateIncludedBuild(IncludedBuild includedBuild, SettingsInternal settings) {
        if (!new File(settings.getSettingsDir(), Settings.DEFAULT_SETTINGS_FILE).exists()) {
            throw new InvalidUserDataException(String.format("Included build '%s' must have a '%s' file.", includedBuild.getName(), Settings.DEFAULT_SETTINGS_FILE));
        }
        if (!settings.getIncludedBuilds().isEmpty()) {
            throw new InvalidUserDataException(String.format("Included build '%s' cannot have included builds.", includedBuild.getName()));
        }
    }

    @Override
    public ConfigurableIncludedBuild createBuild(File buildDirectory) {
        validateBuildDirectory(buildDirectory);
        Factory factory = new ContextualGradleLauncherFactory(buildDirectory, nestedBuildFactory, startParameter);
        DefaultIncludedBuild includedBuild = instantiator.newInstance(DefaultIncludedBuild.class, buildDirectory, factory, moduleIdentifierFactory, workerLeaseService.getCurrentWorkerLease());

        SettingsInternal settingsInternal = includedBuild.getLoadedSettings();
        validateIncludedBuild(includedBuild, settingsInternal);
        return includedBuild;
    }

    @Override
    public void stop() {
        CompositeStoppable.stoppable(launchers).stop();
    }

    private class ContextualGradleLauncherFactory implements Factory {
        private final File buildDirectory;
        private final NestedBuildFactory nestedBuildFactory;
        private final StartParameter buildStartParam;

        public ContextualGradleLauncherFactory(File buildDirectory, NestedBuildFactory nestedBuildFactory, StartParameter buildStartParam) {
            this.buildDirectory = buildDirectory;
            this.nestedBuildFactory = nestedBuildFactory;
            this.buildStartParam = buildStartParam;
        }

        @Override
        public GradleLauncher create() {
            StartParameter participantStartParam = createStartParameter(buildDirectory);

            GradleLauncher gradleLauncher = nestedBuildFactory.nestedInstance(participantStartParam);
            launchers.add(gradleLauncher);
            return gradleLauncher;
        }

        private StartParameter createStartParameter(File buildDirectory) {
            StartParameter includedBuildStartParam = buildStartParam.newBuild();
            includedBuildStartParam.setProjectDir(buildDirectory);
            includedBuildStartParam.setSearchUpwards(false);
            includedBuildStartParam.setConfigureOnDemand(false);
            includedBuildStartParam.setInitScripts(buildStartParam.getInitScripts());
            return includedBuildStartParam;
        }
    }
}




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