Maven 库的可选 Gradle 依赖项 [英] Optional Gradle dependencies for Maven libraries

问题描述

我正在开发一个 Android 库，并且仅当使用我的库的项目也包含该依赖项时才希望使用该依赖项.类似于 Picasso 对 OkHttp 的作用>.

I'm working on an Android library and would like to use a dependency only if the project using my library includes that dependency as well. Similar to what Picasso does with OkHttp.

我已经通过检查 ClassNotFoundExceptions 在主代码中解决了这个问题，但在将其部署到 Maven Central 时它仍然包含依赖项.如何生成诸如 Maven 的 <optional>true</optional> 标记之类的东西?

I already took care of this on the main code by checking for ClassNotFoundExceptions but it still includes the dependencies upon deploying it to Maven Central. How do I generate something such as Maven's <optional>true</optional> tag?

我正在使用 gradle-mvn-push 通过 Gradle 部署我的工件.

I'm using gradle-mvn-push to deploy my artifacts via Gradle.

推荐答案

投票给 GRADLE-1749.

同时你可以使用pom.withXml的方式来修改生成的pom文件，例如添加标签或者修改<;范围>值:

In the mean time you can use pom.withXml approach to modify the generated pom file, for example to add <optional> tags or change <scope>values:

apply plugin: 'java'
apply plugin: 'maven-publish'

configurations {
  optional
  compile.extendsFrom optional
}

dependencies {
  compile 'com.some.group:artifact:1.0';
  optional 'com.another.group:optional-artifact:1.0'
}

publishing {
  publications {
    maven( MavenPublication ) {
      from components.java

      pom.withXml {
        asNode().dependencies.dependency.findAll { xmlDep ->
          // mark optional dependencies
          if ( project.configurations.optional.allDependencies.findAll { dep ->
            xmlDep.groupId.text() == dep.group && xmlDep.artifactId.text() == dep.name
          } ) {
            def xmlOptional = xmlDep.optional[ 0 ];
            if ( !xmlOptional ) {
              xmlOptional = xmlDep.appendNode( 'optional' )
            }
            xmlOptional.value = 'true';
          }

          // fix maven-publish issue when all maven dependencies are placed into runtime scope
          if ( project.configurations.compile.allDependencies.findAll { dep ->
            xmlDep.groupId.text() == dep.group && xmlDep.artifactId.text() == dep.name
          } ) {
            def xmlScope = xmlDep.scope[ 0 ];
            if ( !xmlScope ) {
              xmlScope = xmlDep.appendNode( 'scope' )
            }
            xmlScope.value = 'compile';
          }
        }
      }
    }
  }
}

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