== Sourcing constraints from another platform

Sometimes the platform you define is an extension of another existing platform.

In order to have your platform include the constraints from that third party platform, it needs to be imported as a `platform` _dependency_:

.Importing a platform
====
include::sample[dir="snippets/java-platform/quickstart/kotlin",files="build.gradle.kts[tags=platform]"]

        flavor: flavor 'default'
        target platform: platform '$currentNative'
        tool chain: Tool chain 'clang' (Clang)
        shared library file: build/libs/someLib/shared/libsomeLib.dylib
    Static library 'someLib:staticLibrary'
        build using task: :someLibStaticLibrary
        build type: build type 'debug'
        flavor: flavor 'default'
        target platform: platform '$currentNative'

package org.jetbrains.kotlin.analysis.api.platform.packages

import com.intellij.openapi.project.Project
import com.intellij.psi.search.GlobalSearchScope
import org.jetbrains.kotlin.analysis.api.platform.utils.forEachNonKotlinPsiElementFinder
import org.jetbrains.kotlin.name.FqName
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.platform.TargetPlatform
import org.jetbrains.kotlin.platform.jvm.isJvm

        run "publishAllPublicationsToMavenRepo", "-Pver=1.1"

        then:
        ['1.0', '1.1'].each { v ->
            def platform = mavenRepo.module("com.acme.foo", "platform", v)
            platform.assertPublished()
            platform.hasGradleMetadataRedirectionMarker()
            platform.parsedModuleMetadata.variant("apiElements") {
                constraint("com.acme.foo:core:$v") {
                    exists()

 */

package org.jetbrains.kotlin.analysis.api.platform.packages

import org.jetbrains.kotlin.analysis.api.platform.KotlinCompositeProvider
import org.jetbrains.kotlin.analysis.api.platform.KotlinCompositeProviderFactory
import org.jetbrains.kotlin.name.FqName
import org.jetbrains.kotlin.name.Name
import org.jetbrains.kotlin.platform.TargetPlatform

public class KotlinCompositePackageProvider private constructor(

import okhttp3.internal.platform.Android10Platform
import okhttp3.internal.platform.AndroidPlatform
import okhttp3.internal.platform.BouncyCastlePlatform
import okhttp3.internal.platform.ConscryptPlatform
import okhttp3.internal.platform.Jdk8WithJettyBootPlatform
import okhttp3.internal.platform.Jdk9Platform
import okhttp3.internal.platform.OpenJSSEPlatform
import okhttp3.internal.platform.Platform

import org.gradle.nativeplatform.platform.NativePlatform;
import org.gradle.nativeplatform.platform.internal.NativePlatformInternal;
import org.gradle.nativeplatform.platform.internal.NativePlatforms;
import org.gradle.platform.base.internal.BinaryNamingScheme;
import org.gradle.platform.base.internal.DefaultBinaryNamingScheme;
import org.gradle.platform.base.internal.DefaultPlatformRequirement;

	} else {
		telemetry.Inc("go/mode:module")
	}
	telemetry.Inc("go/platform/target/goos:" + cfg.Goos)
	telemetry.Inc("go/platform/target/goarch:" + cfg.Goarch)
	switch cfg.Goarch {
	case "386":
		telemetry.Inc("go/platform/target/go386:" + cfg.GO386)
	case "amd64":
		telemetry.Inc("go/platform/target/goamd64:" + cfg.GOAMD64)
	case "arm":
		telemetry.Inc("go/platform/target/goarm:" + cfg.GOARM)
	case "arm64":

// tag::platform[]
plugins {
    `java-platform`
// end::platform[]
    id("myproject.publishing-conventions")
// tag::platform[]
}

dependencies {
    // The platform declares constraints on all components that
    // require alignment
    constraints {
        api(project(":core"))
        api(project(":lib"))
        api(project(":utils"))
    }
}
// end::platform[]

publishing {
    publications {

  }

  /** Guard against the default value changing by accident.  */
  @Test
  fun defaultPrefix() {
    assertThat(Platform().getPrefix()).isEqualTo("OkHttp")
  }

  @Test
  fun testToStringIsClassname() {
    assertThat(Platform().toString()).isEqualTo("Platform")
  }

  @Test
  fun testNotAndroid() {
    platform.assumeNotAndroid()

    // This is tautological so just confirms that it runs.