# GenerateStubsMojo.java

    /*
     *  Copyright 2013-2016 the original author or authors.
     *
     *  Licensed under the Apache License, Version 2.0 (the "License");
     *  you may not use this file except in compliance with the License.
     *  You may obtain a copy of the License at
     *
     *       http://www.apache.org/licenses/LICENSE-2.0
     *
     *  Unless required by applicable law or agreed to in writing, software
     *  distributed under the License is distributed on an "AS IS" BASIS,
     *  WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
     *  See the License for the specific language governing permissions and
     *  limitations under the License.
     */
    package org.springframework.cloud.contract.maven.verifier;

    import java.io.File;

    import org.apache.maven.plugin.AbstractMojo;
    import org.apache.maven.plugin.MojoExecutionException;
    import org.apache.maven.plugin.MojoFailureException;
    import org.apache.maven.plugins.annotations.Component;
    import org.apache.maven.plugins.annotations.LifecyclePhase;
    import org.apache.maven.plugins.annotations.Mojo;
    import org.apache.maven.plugins.annotations.Parameter;
    import org.apache.maven.project.MavenProject;
    import org.apache.maven.project.MavenProjectHelper;
    import org.codehaus.plexus.archiver.Archiver;
    import org.codehaus.plexus.archiver.jar.JarArchiver;

    @Mojo(name = "generateStubs", defaultPhase = LifecyclePhase.PACKAGE,
    		requiresProject = true)
    public class GenerateStubsMojo extends AbstractMojo {

    	private static final String STUB_MAPPING_FILE_PATTERN = "**/*.json";
    	private static final String CONTRACT_FILE_PATTERN = "**/*.groovy";

    	@Parameter(defaultValue = "${project.build.directory}", readonly = true,
    			required = true)
    	private File projectBuildDirectory;

    	@Parameter(property = "stubsDirectory",
    			defaultValue = "${project.build.directory}/stubs")
    	private File outputDirectory;

    	/**
    	 * Set this to "true" to bypass Verifier execution..
    	 */
    	@Parameter(property = "spring.cloud.contract.verifier.skip", defaultValue = "false")
    	private boolean skip;

    	@Component
    	private MavenProjectHelper projectHelper;

    	@Parameter(defaultValue = "${project}", readonly = true)
    	private MavenProject project;

    	@Component(role = Archiver.class, hint = "jar")
    	private JarArchiver archiver;

    	@Parameter(defaultValue = "true")
    	private boolean attachContracts;

    	@Parameter(defaultValue = "stubs")
    	private String classifier;

    	public void execute() throws MojoExecutionException, MojoFailureException {
    		if (skip) {
    			getLog().info(
    					"Skipping Spring Cloud Contract Verifier execution: spring.cloud.contract.verifier.skip="
    							+ skip);
    			return;
    		}
    		File stubsJarFile = createStubJar(outputDirectory);
    		projectHelper.attachArtifact(project, "jar", classifier, stubsJarFile);
    	}

    	private File createStubJar(File stubsOutputDir)
    			throws MojoFailureException, MojoExecutionException {
    		if (!stubsOutputDir.exists()) {
    			throw new MojoExecutionException(
    					"Stubs could not be found: [" + stubsOutputDir.getAbsolutePath()
    							+ "] .\nPlease make sure that spring-cloud-contract:convert was invoked");
    		}
    		String stubArchiveName =
    				project.getBuild().getFinalName() + "-" + classifier + ".jar";
    		File stubsJarFile = new File(projectBuildDirectory, stubArchiveName);
    		try {
    			if (attachContracts) {
    				archiver.addDirectory(stubsOutputDir,
    						new String[] { STUB_MAPPING_FILE_PATTERN, CONTRACT_FILE_PATTERN },
    						new String[0]);
    			}
    			else {
    				getLog().info(
    						"Skipping attaching Spring Cloud Contract Verifier contracts");
    				archiver.addDirectory(stubsOutputDir,
    						new String[] { STUB_MAPPING_FILE_PATTERN },
    						new String[] { CONTRACT_FILE_PATTERN });
    			}
    			archiver.setCompress(true);
    			archiver.setDestFile(stubsJarFile);
    			archiver.addConfiguredManifest(ManifestCreator.createManifest(project));
    			archiver.createArchive();
    		}
    		catch (Exception e) {
    			throw new MojoFailureException(
    					"Exception while packaging " + classifier + " jar.", e);
    		}
    		return stubsJarFile;
    	}

    }