Jenkins injector for maven project version

MavenPropertiesInjectorBuildWrapper.java

package jenkinsci.plugins.mavenpropsinject;

import hudson.Extension;
import hudson.Launcher;
import hudson.maven.AbstractMavenProject;
import hudson.maven.MavenModule;
import hudson.maven.MavenModuleSet;
import hudson.model.AbstractBuild;
import hudson.model.AbstractProject;
import hudson.model.BuildListener;
import hudson.tasks.BuildWrapper;
import hudson.tasks.BuildWrapperDescriptor;
import org.kohsuke.stapler.DataBoundConstructor;
import java.io.IOException;
import java.util.Map;

/**
 * This wrapper injects a the {@code MAVEN_PROJECT_VERSION} property containing the maven project 
 * version (root module version for multi-module projects).
 *
 * @author Jean-Christophe Sirot
 */
public class MavenPropertiesInjectorBuildWrapper extends BuildWrapper
{
	@DataBoundConstructor
	public MavenPropertiesInjectorBuildWrapper()
	{
	}
	
	@Override
	public Environment setUp(AbstractBuild build, final Launcher launcher, BuildListener listener) 
		throws IOException, InterruptedException
	{
		AbstractMavenProject project = (AbstractMavenProject)build.getProject();
		final String version;
		if (project instanceof MavenModuleSet) {
			MavenModule module = ((MavenModuleSet)project).getRootModule();
			version = module.getVersion();
		} else if (project instanceof MavenModule) {
			version = ((MavenModule)project).getVersion();
		} else {
			throw new RuntimeException("Not a maven project");
		}
		launcher.getListener().getLogger().append("Injected project version: ").append(version).append("\n");
		return new Environment() {
			@Override
			public void buildEnvVars(Map<String, String> env)
			{
				launcher.getListener().getLogger().append(env.toString()).append("\n");
				env.put("MAVEN_PROJECT_VERSION", version);
			}
		};
	}
	
	@Extension
	public static final class DescriptorImpl extends BuildWrapperDescriptor
	{
		@Override
		public boolean isApplicable(AbstractProject<?, ?> item)
		{
			return item instanceof AbstractMavenProject;
		}

		@Override
		public String getDisplayName()
		{
			return "Maven Properties Injector";
		}
	}
}