Overview

Experiment to see how Maven Java DSL could look like. Main goal is to explore possible syntax options and get feedback on pom.java syntax.

Example

Simple example

public class pom extends org.sonatype.maven.polyglot.java.dsl.ModelFactory {

	@SuppressWarnings({ "unchecked" })
	public void project() {

		modelVersion = "4.0.0";
		groupId = "org.sample1";
		artifactId = "project1";
		packaging = "jar";
		version = "1.0-SNAPSHOT";

		properties(
			property(name1 -> "property_1"),
			property(name2 -> "property_2")
		);

		dependencies(
			dependency(groupId -> "junit", artifactId -> "junit", version -> "3.8.1", scope -> "test")
		);
		
	}
}

Configuration

To use Polyglot for Maven you need to edit ${maven.multiModuleProjectDirectory}/.mvn/extensions.xml and add the appropriate language extension.

There is sample project in polyglot-maven-examples project.

Update extensions.xml

Edit the extensions.xml file and add the following, replacing VERSION with the latest stable version of current artifact.

<?xml version="1.0" encoding="UTF-8"?>
<extensions>
  <extension>
    <groupId>io.takari.polyglot</groupId>
    <artifactId>polyglot-java</artifactId>
    <version>VERSION</version>
  </extension>
</extensions>

Convert existing POM

Use simple Maven Plugin that will help you convert any existing pom.xml files:

mvn io.takari.polyglot:polyglot-translate-plugin:translate -Dinput=pom.xml -Doutput=pom.java

Model Interpolation

Model Interpolation consists in replacing ${...} with calculated value. This mechanism works for Java DSL as well. For example, if you can change output directory for compiled classes by adding

build(outputDirectory -> "${project.build.directory}/classes_1");

to you Java based POM definition. For more information about Model Interpolation please refer to http://maven.apache.org/ref/3.5.3/maven-model-builder/#Model_Interpolation

Other ways to get value of ${basedir} property are standard Java ways:

String baseDir = System.getProperty("user.dir")

or

String baseDir = java.nio.file.Paths.get("").toAbsolutePath().toString();

Limitations

Currently not supported:

• Convenience methods for private org.apache.maven.model.Organization organization;
• Convenience methods for private java.util.List licenses;
• Convenience methods for private java.util.List developers;
• Convenience methods for private java.util.List contributors;
• Convenience methods for private java.util.List mailingLists;
• Convenience methods for private org.apache.maven.model.Prerequisites prerequisites;
• Convenience methods for private org.apache.maven.model.Scm scm;
• Convenience methods for private org.apache.maven.model.IssueManagement issueManagement;
• Convenience methods for private org.apache.maven.model.CiManagement ciManagement;
• Convenience methods for private org.apache.maven.model.DistributionManagement distributionManagement;
• Convenience methods for private java.lang.Object reports;
• Convenience methods for private org.apache.maven.model.Reporting reporting;

To deal with these temporary limitations you have access to model variable from parent class. And you can use it's methods to add configuration for any entities. For example:

Contributor contributor = new Contributor();
contributor.setName("John Smith");
model.addContributor(contributor);