sdks/java/bom/build.gradle

/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you 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.
 */

// beam-sdks-java-bom generates a BOM (Bill of Materials) in the form of
// a pom.xml file, which enables users to easily import multiple modules
// from Beam at the same version. See
// https://github.com/GoogleCloudPlatform/cloud-opensource-java/blob/master/library-best-practices/JLBP-15.md
// for more details on BOMs.

plugins {
  id 'org.apache.beam.module'
  id 'java'
  id 'maven-publish'
}

def isRelease(Project project) {
  return project.hasProperty('isRelease')
}

ext {
  mavenJavaDir = "$project.buildDir/publications/mavenJava"
  mavenJavaBomOutputFile = file(mavenJavaDir + "/pom-default.xml")
}

for (p in rootProject.subprojects) {
  if (!p.path.equals(project.path)) {
    evaluationDependsOn(p.path)
  }
}

def bomModuleNames = new ArrayList<>()
for (p in rootProject.subprojects) {
  def subproject = p // project(':' + p.name)
  if (subproject.ext.properties.containsKey('includeInJavaBom') &&
      subproject.ext.properties.includeInJavaBom) {
    bomModuleNames.add(subproject.archivesBaseName)
  }
}

// Copy our pom.xml to the location where a generated POM would go
task copyPom(type: Copy) {
  from 'pom.xml.template'
  into mavenJavaDir
  rename 'pom.xml.template', 'pom-default.xml'
  expand(version: project.version, modules: bomModuleNames)
}

assemble.dependsOn copyPom

// We want to use our own pom.xml instead of the generated one, so we disable
// the pom.xml generation and have the publish tasks depend on `copyPom` instead.
tasks.whenTaskAdded { task ->
  if (task.name == 'generatePomFileForMavenJavaPublication') {
    // Ensures the pom file is signed later if we are performing a release (see BEAM-11068)
    task.doLast {
      copy {
        from 'pom.xml.template'
        into mavenJavaDir
        rename 'pom.xml.template', 'pom-default.xml'
        expand(version: project.version, modules: bomModuleNames)
      }
    }
  } else if (task.name.startsWith('publishMavenJavaPublication')) {
    task.dependsOn copyPom
  }
}

jar.enabled = false

// Remove the default jar archive which is added by the 'java' plugin.
configurations.archives.artifacts.with { archives ->
  def artifacts = []
  archives.each {
    if (it.file =~ 'jar') {
      // We can't just call `archives.remove(it)` here because it triggers
      // a `ConcurrentModificationException`, so we add matching artifacts
      // to another list, then remove those elements outside of this iteration.
      artifacts.add(it)
    }
  }
  artifacts.each {
    archives.remove(it)
  }
}

artifacts {
  archives(mavenJavaBomOutputFile) {
    builtBy copyPom
  }
}

afterEvaluate {
  // We can't use the `publishing` section from applyJavaNature because
  // we don't want all the Java artifacts, and we want to use our own pom.xml
  // instead of the generated one.
  publishing {
    publications {
      mavenJava(MavenPublication) {
        groupId = project.mavenGroupId
        artifactId = archivesBaseName
        version = project.version
      }
    }
    repositories project.ext.repositories
  }

  // Only sign artifacts if we are performing a release
  if (isRelease(project) && !project.hasProperty('noSigning')) {
    apply plugin: "signing"
    signing {
      useGpgCmd()
      sign publishing.publications
    }
  }
}