配置缓存

abstract class SomeTask : DefaultTask() {

    @get:Input lateinit var sourceSet: SourceSet (1)

    @TaskAction
    fun action() {
        val classpathFiles = sourceSet.compileClasspath.files
        // ...
    }
}

abstract class SomeTask extends DefaultTask {

    @Input SourceSet sourceSet (1)

    @TaskAction
    void action() {
        def classpathFiles = sourceSet.compileClasspath.files
        // ...
    }
}

abstract class SomeTask : DefaultTask() {

    @get:InputFiles @get:Classpath
    abstract val classpath: ConfigurableFileCollection (1)

    @TaskAction
    fun action() {
        val classpathFiles = classpath.files
        // ...
    }
}

abstract class SomeTask extends DefaultTask {

    @InputFiles @Classpath
    abstract ConfigurableFileCollection getClasspath() (1)

    @TaskAction
    void action() {
        def classpathFiles = classpath.files
        // ...
    }
}

tasks.register("someTask") {
    doLast {
        val classpathFiles = sourceSets.main.get().compileClasspath.files (1)
    }
}

tasks.register('someTask') {
    doLast {
        def classpathFiles = sourceSets.main.compileClasspath.files (1)
    }
}

tasks.register("someTask") {
    val classpath = sourceSets.main.get().compileClasspath (1)
    doLast {
        val classpathFiles = classpath.files
    }
}

tasks.register('someTask') {
    def classpath = sourceSets.main.compileClasspath (1)
    doLast {
        def classpathFiles = classpath.files
    }
}

abstract class SomeTask : DefaultTask() {
    @TaskAction
    fun action() {
        project.copy { (1)
            from("source")
            into("destination")
        }
    }
}

abstract class SomeTask extends DefaultTask {
    @TaskAction
    void action() {
        project.copy { (1)
            from 'source'
            into 'destination'
        }
    }
}

abstract class SomeTask : DefaultTask() {

    @get:Inject abstract val fs: FileSystemOperations (1)

    @TaskAction
    fun action() {
        fs.copy {
            from("source")
            into("destination")
        }
    }
}

abstract class SomeTask extends DefaultTask {

    @Inject abstract FileSystemOperations getFs() (1)

    @TaskAction
    void action() {
        fs.copy {
            from 'source'
            into 'destination'
        }
    }
}

tasks.register("someTask") {
    doLast {
        project.copy { (1)
            from("source")
            into("destination")
        }
    }
}

tasks.register('someTask') {
    doLast {
        project.copy { (1)
            from 'source'
            into 'destination'
        }
    }
}

interface Injected {
    @get:Inject val fs: FileSystemOperations (1)
}
tasks.register("someTask") {
    val injected = project.objects.newInstance<Injected>() (2)
    doLast {
        injected.fs.copy { (3)
            from("source")
            into("destination")
        }
    }
}

interface Injected {
    @Inject FileSystemOperations getFs() (1)
}
tasks.register('someTask') {
    def injected = project.objects.newInstance(Injected) (2)
    doLast {
        injected.fs.copy { (3)
            from 'source'
            into 'destination'
        }
    }
}

class StateObject {
    // ...
}

abstract class StatefulTask : DefaultTask() {
    @get:Internal
    var stateObject: StateObject? = null

    @get:Internal
    var strings: List<String>? = null
}


tasks.register<StatefulTask>("checkEquality") {
    val objectValue = StateObject()
    val stringsValue = arrayListOf("a", "b")

    stateObject = objectValue
    strings = stringsValue

    doLast { (1)
        println("POJO reference equality: ${stateObject === objectValue}") (2)
        println("Collection reference equality: ${strings === stringsValue}") (3)
        println("Collection equality: ${strings == stringsValue}") (4)
    }
}

class StateObject {
    // ...
}

abstract class StatefulTask extends DefaultTask {
    @Internal
    StateObject stateObject

    @Internal
    List<String> strings
}


tasks.register("checkEquality", StatefulTask) {
    def objectValue = new StateObject()
    def stringsValue = ["a", "b"] as ArrayList<String>

    stateObject = objectValue
    strings = stringsValue

    doLast { (1)
        println("POJO reference equality: ${stateObject === objectValue}") (2)
        println("Collection reference equality: ${strings === stringsValue}") (3)
        println("Collection equality: ${strings == stringsValue}") (4)
    }
}

val gitVersion = providers.exec {
    commandLine("git", "--version")
}.standardOutput.asText.get()

def gitVersion = providers.exec {
    commandLine("git", "--version")
}.standardOutput.asText.get()

abstract class GitVersionValueSource : ValueSource<String, ValueSourceParameters.None> {
    @get:Inject
    abstract val execOperations: ExecOperations

    override fun obtain(): String {
        val output = ByteArrayOutputStream()
        execOperations.exec {
            commandLine("git", "--version")
            standardOutput = output
        }
        return String(output.toByteArray(), Charset.defaultCharset())
    }
}

abstract class GitVersionValueSource implements ValueSource<String, ValueSourceParameters.None> {
    @Inject
    abstract ExecOperations getExecOperations()

    String obtain() {
        ByteArrayOutputStream output = new ByteArrayOutputStream()
        execOperations.exec {
            it.commandLine "git", "--version"
            it.standardOutput = output
        }
        return new String(output.toByteArray(), Charset.defaultCharset())
    }
}

val gitVersionProvider = providers.of(GitVersionValueSource::class) {}
val gitVersion = gitVersionProvider.get()

def gitVersionProvider = providers.of(GitVersionValueSource.class) {}
def gitVersion = gitVersionProvider.get()

val jdkLocations = System.getenv().filterKeys {
    it.startsWith("JDK_")
}

def jdkLocations = System.getenv().findAll {
    key, _ -> key.startsWith("JDK_")
}

val jdkVariables = listOf("JDK_8", "JDK_11", "JDK_17")
val jdkLocations = jdkVariables.filter { v ->
    System.getenv(v) != null
}.associate { v ->
    v to System.getenv(v)
}

def jdkVariables = ["JDK_8", "JDK_11", "JDK_17"]
def jdkLocations = jdkVariables.findAll { v ->
    System.getenv(v) != null
}.collectEntries { v ->
    [v, System.getenv(v)]
}

val jdkLocationsProvider = providers.environmentVariablesPrefixedBy("JDK_")

def jdkLocationsProvider = providers.environmentVariablesPrefixedBy("JDK_")

abstract class EnvVarsWithSubstringValueSource : ValueSource<Map<String, String>, EnvVarsWithSubstringValueSource.Parameters> {
    interface Parameters : ValueSourceParameters {
        val substring: Property<String>
    }

    override fun obtain(): Map<String, String> {
        return System.getenv().filterKeys { key ->
            key.contains(parameters.substring.get())
        }
    }
}
val jdkLocationsProvider = providers.of(EnvVarsWithSubstringValueSource::class) {
    parameters {
        substring = "JDK"
    }
}

abstract class EnvVarsWithSubstringValueSource implements ValueSource<Map<String, String>, Parameters> {
    interface Parameters extends ValueSourceParameters {
        Property<String> getSubstring()
    }

    Map<String, String> obtain() {
        return System.getenv().findAll { key, _ ->
            key.contains(parameters.substring.get())
        }
    }
}
def jdkLocationsProvider = providers.of(EnvVarsWithSubstringValueSource.class) {
    parameters {
        substring = "JDK"
    }
}

val config = file("some.conf").readText()

def config = file('some.conf').text

val config = providers.fileContents(layout.projectDirectory.file("some.conf"))
    .asText

def config = providers.fileContents(layout.projectDirectory.file('some.conf'))
    .asText

def dir = file('data')

def listFiles(File dir) {
    dir.listFiles({ file -> file.isFile() } as FileFilter).name.sort()
}

tasks.register('listFiles') {
    doLast {
        println listFiles(dir)
    }
}

def dir = file('data')

class Files {
    static def listFiles(File dir) {
        dir.listFiles({ file -> file.isFile() } as FileFilter).name.sort()
    }
}

tasks.register('listFilesFixed') {
    doLast {
        println Files.listFiles(dir)
    }
}

val dir = file("data")

fun listFiles(dir: File): List<String> =
    dir.listFiles { file: File -> file.isFile }.map { it.name }.sorted()

tasks.register("listFiles") {
    doLast {
        println(listFiles(dir))
    }
}

object Files { (1)
    fun listFiles(dir: File): List<String> =
        dir.listFiles { file: File -> file.isFile }.map { it.name }.sorted()
}

tasks.register("listFilesFixed") {
    val dir = file("data") (2)
    doLast {
        println(Files.listFiles(dir))
    }
}