如何从 org.apache.maven.artifact.Artifact 获取 POM 属性

Question

我正在使用 org.apache.maven.shared.dependency.graph.DependencyGraphBuilder.buildDependencyGraph() 和生成的 org.apache.maven.shared.dependency.graph.DependencyNode 在插件中遍历我的主 pom 的依赖关系图

但是，一旦我到达具有特定 groupId 的依赖项，我需要访问在其 pom.xml 中声明的 maven 属性。如何通过 Artifact 或 DependencyNode 对象访问 pom？

Answer 1

让我来回答这个时髦的风格....（使用为GMaven 编写的脚本）

我将使用 webjars.org 提供的 Javascript 依赖项作为示例，我想在其中读取（不幸的是，可选，正如我刚刚发现的）requirejs 属性。

/**
 * Read the requirejs property in pom (if possible) or in file (if not available in pom)
 * @param log the logger injected into the groovy script
 * @param project the MavenProject object (well, not really, but anyway a good implementor)
 * @param session the MavenSession
 * @param artifact the artifact in which we want to read the requirejs property
 */
def readRequireJSPropertyOf(def log, def project, def session, def artifact) {
    // This is the hardest part : the session gives access (through MavenSession#getContainer()) to the PlexusContainer, which allows lookup of various components
    MavenProjectBuilder projectBuilder = session.container.lookup(MavenProjectBuilder.class);
    // Now we have a MavenProjectBuilder, just build a MavenProject object
    MavenProject artifactProject = projectBuilder.buildFromRepository(artifact, project.remoteArtifactRepositories, session.localRepository);
    log.debug "loaded project ${artifactProject}. Now reading its requirejs property"
    // And read that property from artifact POM
    def requireValue = artifactProject.properties["requirejs"];
    return requireValue
}

再一次，我不能足够强调对PlexusContainer 的访问如何节省一天，除了知道MavenProjectBuilder 组件存在于某处。请注意，此组件已弃用，可通过 maven-compat 工件获得。