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 * Copyright (c) 2010-2011 Oracle and/or its affiliates. All rights reserved.
 *
 * The contents of this file are subject to the terms of either the GNU
 * General Public License Version 2 only ("GPL") or the Common Development
 * and Distribution License("CDDL") (collectively, the "License").  You
 * may not use this file except in compliance with the License.  You can
 * obtain a copy of the License at
 * http://glassfish.java.net/public/CDDL+GPL_1_1.html
 * or packager/legal/LICENSE.txt.  See the License for the specific
 * language governing permissions and limitations under the License.
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 * file and include the License file at packager/legal/LICENSE.txt.
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 * GPL Classpath Exception:
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package com.sun.jersey.wadl;

import java.util.ArrayList;
import java.util.Collection;
import java.util.List;

import org.apache.maven.artifact.Artifact;
import org.apache.maven.artifact.DependencyResolutionRequiredException;
import org.apache.maven.artifact.repository.ArtifactRepository;
import org.apache.maven.artifact.resolver.ArtifactNotFoundException;
import org.apache.maven.artifact.resolver.ArtifactResolutionException;
import org.apache.maven.model.Dependency;
import org.apache.maven.plugin.AbstractMojo;
import org.apache.maven.plugin.MojoExecutionException;
import org.apache.maven.project.MavenProject;

import com.sun.jersey.wadl.util.Loader;

/**
 * This is a base class for mojos that need to access the project classpath.
 * 
 */
public abstract class AbstractMojoProjectClasspathSupport extends AbstractMojo {

    /**
     * Additional dependencies that shall be made available when running this
     * goal. Use this when you get e.g. ClassNotFoundExceptions.
     * 
     * @parameter property="dependencies"
     */
    private List _dependencies;
    
    /** @parameter expression="${project}" */
    private org.apache.maven.project.MavenProject mavenProject;
    
    /** @component */
    private org.apache.maven.artifact.factory.ArtifactFactory artifactFactory;

    /** @component */
    private org.apache.maven.artifact.resolver.ArtifactResolver resolver;

    /**@parameter expression="${localRepository}" */
    private org.apache.maven.artifact.repository.ArtifactRepository localRepository;

    /** @parameter expression="${project.remoteArtifactRepositories}" */
    private java.util.List remoteRepositories;

    public final void execute() throws MojoExecutionException {

        final List classpathElements;
        try {
            classpathElements = getClasspathElements( mavenProject, _dependencies );
        } catch ( Exception e ) {
            getLog().error( e );
            throw new MojoExecutionException( "Could not create the list of classpath elements.", e );
        }
        
        final ClassLoader cl = Thread.currentThread().getContextClassLoader();
        final ClassLoader ncl = new Loader( classpathElements.toArray( new String[0] ), this.getClass().getClassLoader() );
        Thread.currentThread().setContextClassLoader(ncl);
        try {
            executeWithClasspath( classpathElements );
        } catch( MojoExecutionException e ) {
            throw e;
        } catch(Exception e) {
            getLog().error( e );
            throw new MojoExecutionException( "Could not execute mojo", e );
        }
        finally {
            Thread.currentThread().setContextClassLoader(cl);
        }
    }
    
    protected abstract void executeWithClasspath( List classpathElements ) throws MojoExecutionException;

    /**
     * Create a list of classpath elements including declared build dependencies, the build
     * output directory and additionally configured dependencies.
     * @param mavenProject
     * @param additionalDependencies
     * @return a list of classpath elements
     * @throws DependencyResolutionRequiredException
     * @throws ArtifactResolutionException
     * @throws ArtifactNotFoundException
     * @author Martin Grotzke
     */
    protected List getClasspathElements( final MavenProject mavenProject,
            final List additionalDependencies )
            throws DependencyResolutionRequiredException,
            ArtifactResolutionException, ArtifactNotFoundException {
        
        final List paths = new ArrayList();
        
        /* Add maven compile classpath elements
         */
        @SuppressWarnings("unchecked")
        final List compileClasspathElements = mavenProject.getCompileClasspathElements();
        paths.addAll( compileClasspathElements );
        
        /* Add build dependencies as classpath elements
         */
        @SuppressWarnings("unchecked")
        final Collection dependencies = mavenProject.getDependencies();
        if ( dependencies != null ) {
            for ( Dependency dependency : dependencies ) {
                if ( dependency.getSystemPath() != null ) {
                    getLog().debug( "Adding dependency with systemPath " + dependency.getSystemPath() );
                    paths.add( dependency.getSystemPath() );
                }
                else {
                    final Artifact artifact = artifactFactory.createArtifactWithClassifier(
                            dependency.getGroupId(), dependency.getArtifactId(),
                            dependency.getVersion(), dependency.getType(), dependency.getClassifier() );
                    resolver.resolve( artifact, remoteRepositories, localRepository );
                    getLog().debug( "Adding artifact " + artifact.getFile().getPath() );
                    paths.add( artifact.getFile().getPath() );
                }
            }
        }
        
        /* Add additional dependencies
         */
        if ( additionalDependencies != null ) {
            for ( com.sun.jersey.wadl.Dependency dependency : additionalDependencies ) {
                if ( dependency.getSystemPath() != null ) {
                    getLog().debug( "Adding additional dependency with systemPath " + dependency.getSystemPath() );
                    paths.add( dependency.getSystemPath() );
                }
                else {
                    final Artifact artifact = artifactFactory.createArtifactWithClassifier(
                            dependency.getGroupId(), dependency.getArtifactId(),
                            dependency.getVersion(), "jar", null );
                    resolver.resolve( artifact, remoteRepositories, localRepository );
                    getLog().debug( "Adding additional artifact " + artifact.getFile().getPath() );
                    paths.add( artifact.getFile().getPath() );
                }
            }
        }
        
        return paths;
    }
    
    /**
     * @param dependencies the dependencies to set
     * @author Martin Grotzke
     */
    public void setDependencies( List dependencies ) {
        _dependencies = dependencies;
    }
    
}




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