me.tatarka.RetrolambdaPluginJava.groovy Maven / Gradle / Ivy

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A gradle plugin for getting java lambda support in java 6, 7 and android
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/**
 Copyright 2014 Evan Tatarka

 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 me.tatarka

import groovy.transform.CompileStatic
import org.gradle.api.Plugin
import org.gradle.api.Project
import org.gradle.api.ProjectConfigurationException
import org.gradle.api.Task
import org.gradle.api.plugins.JavaPluginConvention
import org.gradle.api.tasks.SourceSet
import org.gradle.api.tasks.compile.JavaCompile
import org.gradle.api.tasks.testing.Test

import static me.tatarka.RetrolambdaPlugin.checkIfExecutableExists

@CompileStatic
public class RetrolambdaPluginJava implements Plugin {
    @Override
    void apply(Project project) {
        project.afterEvaluate {
            def retrolambda = project.extensions.getByType(RetrolambdaExtension)
            def javaPlugin = project.convention.getPlugin(JavaPluginConvention)

            javaPlugin.sourceSets.all { SourceSet set ->
                if (retrolambda.isIncluded(set.name)) {
                    def name = RetrolambdaUtil.capitalize(set.name)
                    def taskName = "compileRetrolambda$name"
                    def oldOutputDir = RetrolambdaUtil.javaOutputDir(set)
                    def newOutputDir = project.file("$project.buildDir/retrolambda/$set.name")

                    def compileJavaTask = project.tasks.getByName(set.compileJavaTaskName) as JavaCompile
                    compileJavaTask.destinationDir = newOutputDir

                    def retrolambdaTask = project.task(taskName, dependsOn: compileJavaTask, type: RetrolambdaTask) { Task task ->
                        RetrolambdaTask t = task as RetrolambdaTask
                        t.inputDir = newOutputDir
                        t.outputDir = oldOutputDir
                        t.classpath = set.compileClasspath + project.files(newOutputDir)
                        t.javaVersion = retrolambda.javaVersion
                        t.jvmArgs = retrolambda.jvmArgs
                        t.enabled = !set.allJava.isEmpty()
                    }

                    // enable retrolambdaTask dynamically, based on up-to-date source set before running 
                    project.gradle.taskGraph.beforeTask { Task task ->
                        if (task == retrolambdaTask) {
                            retrolambdaTask.setEnabled(!set.allJava.isEmpty())
                        }
                    }

                    project.tasks.findByName(set.classesTaskName).dependsOn(retrolambdaTask)

                    if (!retrolambda.onJava8) {
                        // Set JDK 8 for compiler task
                        compileJavaTask.doFirst {
                            compileJavaTask.options.fork = true
                            compileJavaTask.options.forkOptions.executable = "${retrolambda.tryGetJdk()}/bin/javac"
                        }
                    }
                }
            }

            project.tasks.getByName("test").doFirst { Test task ->
                if (retrolambda.onJava8) {
                    //Run tests on java6/7 if the property is defined.
                    String oldJdkPath = retrolambda.oldJdk
                    if (oldJdkPath != null) {
                        def oldJava = "$oldJdkPath/bin/java"
                        if (!checkIfExecutableExists(oldJava)) {
                            throw new ProjectConfigurationException("Cannot find executable: $oldJava", (Throwable) null)
                        }
                        task.executable oldJava
                    }
                }
            }
        }
    }
}