如何从org.apache.maven.artifact.Artifact中获取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遍历插件中的主pom的依赖关系图。

但是，一旦使用特定的groupId到达依赖项，就需要访问在其pom中声明的maven属性。如何通过工件或DependencyNode对象访问pom？

Answer 1

让我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，在该依赖项中，我希望阅读requirejs属性(不幸的是，正如我刚刚发现的那样)。

/**
 * 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
}

同样，我不能充分强调对PlexusContainer的访问是如何节省时间的，除了MavenProjectBuilder组件存在于某个地方的知识之外。注意，这个组件是不推荐的，并且可以通过maven-compat工件获得。