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/*
Copyright (C) 2016 Migeran

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.moe.gradle.tasks;

import org.gradle.api.GradleException;
import org.gradle.api.file.ConfigurableFileCollection;
import org.gradle.api.tasks.Input;
import org.gradle.api.tasks.InputFile;
import org.gradle.api.tasks.InputFiles;
import org.gradle.api.tasks.Internal;
import org.gradle.api.tasks.OutputFile;
import org.gradle.api.tasks.SourceSet;
import org.moe.gradle.MoePlugin;
import org.moe.gradle.MoeSDK;
import org.moe.gradle.anns.IgnoreUnused;
import org.moe.gradle.anns.NotNull;
import org.moe.gradle.anns.Nullable;
import org.moe.gradle.utils.FileUtils;
import org.moe.gradle.utils.Require;

import java.io.File;
import java.io.IOException;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.util.ArrayList;
import java.util.Collection;
import java.util.HashSet;
import java.util.List;
import java.util.Set;
import java.util.stream.Collectors;

public class Dex extends AbstractBaseTask {

    private static final String CONVENTION_DX_JAR = "dxJar";
    private static final String CONVENTION_INPUT_FILES = "inputFiles";
    private static final String CONVENTION_EXTRA_ARGS = "extraArgs";
    private static final String CONVENTION_DEST_JAR = "destJar";

    @Nullable
    private Object dxJar;

    @NotNull
    @InputFile
    public File getDxJar() {
        return getProject().file(getOrConvention(dxJar, CONVENTION_DX_JAR));
    }

    @IgnoreUnused
    public void setDxJar(@Nullable Object dxJar) {
        this.dxJar = dxJar;
    }

    @Nullable
    private Set inputFiles;

    @InputFiles
    @NotNull
    public ConfigurableFileCollection getInputFiles() {
        return getProject().files(getOrConvention(inputFiles, CONVENTION_INPUT_FILES));
    }

    @IgnoreUnused
    public void setInputFiles(@Nullable Collection inputFiles) {
        this.inputFiles = inputFiles == null ? null : new HashSet<>(inputFiles);
    }

    @Nullable
    private List extraArgs;

    @Input
    @NotNull
    public List getExtraArgs() {
        return getOrConvention(extraArgs, CONVENTION_EXTRA_ARGS);
    }

    @IgnoreUnused
    public void setExtraArgs(@Nullable Collection extraArgs) {
        this.extraArgs = extraArgs == null ? null : new ArrayList<>(extraArgs);
    }

    @Nullable
    private Object destJar;

    @OutputFile
    @NotNull
    public File getDestJar() {
        return getProject().file(getOrConvention(destJar, CONVENTION_DEST_JAR));
    }

    @IgnoreUnused
    public void setDestJar(@Nullable Object destJar) {
        this.destJar = destJar;
    }

    @Override
    protected void run() {
        try {
            FileUtils.deleteFileOrFolder(getDestJar());
        } catch (IOException e) {
            throw new GradleException("an IOException occurred", e);
        }

        javaexec(spec -> {
            spec.setMain("-jar");
            spec.args(getDxJar().getAbsolutePath());
            prepareArgumentsList().forEach(spec::args);
        });
    }

    @NotNull
    private List prepareArgumentsList() {
        List args = new ArrayList<>();

        // Set mode
        args.add("--dex");

        args.add("--verbose");
        args.add("--multi-dex");
        args.add("--core-library");

        // Set extra arguments
        args.addAll(getExtraArgs().stream().map(Object::toString).collect(Collectors.toList()));

        // Set output
        args.add("--output=" + getDestJar().getAbsolutePath());

        // Set inputs
        getInputFiles().forEach(it -> args.add(it.getAbsolutePath()));
        return args;
    }

    private Retrolambda retrolambdaTaskDep;

    @NotNull
    @Internal
    public Retrolambda getRetrolambdaTaskDep() {
        return Require.nonNull(retrolambdaTaskDep);
    }

    protected final void setupMoeTask(@NotNull SourceSet sourceSet) {
        Require.nonNull(sourceSet);

        setSupportsRemoteBuild(false);

        final MoeSDK sdk = getMoeSDK();

        // Construct default output path
        final Path out = Paths.get(MoePlugin.MOE, sourceSet.getName(), "dex");

        setDescription("Generates dex files (sourceset: " + sourceSet.getName() + ").");

        // Add dependencies
        final Retrolambda retroTask = getMoePlugin().getTaskBy(Retrolambda.class, sourceSet);
        retrolambdaTaskDep = retroTask;
        dependsOn(retroTask);

        // Update convention mapping
        addConvention(CONVENTION_DX_JAR, sdk::getDxJar);
        addConvention(CONVENTION_INPUT_FILES, () -> {
            final ArrayList files = new ArrayList<>();
            files.add(retroTask.getOutputDir());
            return files;

        });
        addConvention(CONVENTION_EXTRA_ARGS, ArrayList::new);
        addConvention(CONVENTION_DEST_JAR, () -> resolvePathInBuildDir(out, "classes.jar"));
        addConvention(CONVENTION_LOG_FILE, () -> resolvePathInBuildDir(out, "Dex.log"));
    }
}
 















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