core-integration-tests-support/core-integration-testing-plugins/maven-it-plugin-generate-envar-properties/src/main/java/org/apache/maven/plugin/coreit/InterpolatedEnvarConfigurationMojo.java

package org.apache.maven.plugin.coreit;

import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;

import java.util.Properties;
import java.io.FileOutputStream;
import java.io.File;

/**
 * Interpolate some envars that are embedded in the POM and make sure they pass through
 * the system.
 * 
 * @goal generate-envar-properties
 */
public class InterpolatedEnvarConfigurationMojo
    extends AbstractMojo
{
    /**
     * @parameter expression="${basedir}"
     */
    private String basedir;

    /**
     * @parameter expression="${mavenTestEnvar}"
     */
    private String mavenTestEnvar;

    public void execute()
        throws MojoExecutionException
    {
        if ( mavenTestEnvar == null )
        {
            throw new MojoExecutionException( "The mavenTestEnvar field should not be null! You must run this using the maven-core-it scripts! ");
        }
        
        try
        {
            Properties mojoGeneratedPropeties = new Properties();

            mojoGeneratedPropeties.put( "maven.test.envar", mavenTestEnvar );

            FileOutputStream fos = new FileOutputStream( new File( basedir, "target/mojo-generated.properties" ) );

            mojoGeneratedPropeties.store( fos, "# Properties generated by the execution of a mojo that uses interpolated envar values." );
        }
        catch( Exception e )
        {
            getLog().error( "Error creating mojo generated properties.", e );
        }
    }
}