// COPIED FROM MAVEN: DO NOT MODIFY
package org.kohsuke.stapler;

/*
 * Copyright 2001-2005 The Apache Software Foundation.
 *
 * 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.
 */

import org.apache.maven.artifact.Artifact;
import org.apache.maven.plugin.CompilationFailureException;
import org.apache.maven.plugin.MojoExecutionException;
import org.codehaus.plexus.compiler.util.scan.SimpleSourceInclusionScanner;
import org.codehaus.plexus.compiler.util.scan.SourceInclusionScanner;
import org.codehaus.plexus.compiler.util.scan.StaleSourceScanner;

import java.io.File;
import java.util.Collections;
import java.util.HashSet;
import java.util.List;
import java.util.Set;

/**
 * Compiles application sources
 *
 * @author <a href="mailto:jason@maven.org">Jason van Zyl </a>
 * @version $Id: CompilerMojo.java 383 2007-08-19 17:12:03Z kohsuke $
 * @phase compile
 * @requiresDependencyResolution compile
 */
public class CompilerMojo
    extends AbstractCompilerMojo {
    /**
     * The source directories containing the sources to be compiled.
     *
     * @parameter expression="${project.compileSourceRoots}"
     * @required
     * @readonly
     */
    private List compileSourceRoots;

    /**
     * Project classpath.
     *
     * @parameter expression="${project.compileClasspathElements}"
     * @required
     * @readonly
     */
    private List classpathElements;

    /**
     * The directory for compiled classes.
     *
     * @parameter expression="${project.build.outputDirectory}"
     * @required
     * @readonly
     */
    private File outputDirectory;

    /**
     * Project artifacts.
     *
     * @parameter expression="${project.artifact}"
     * @required
     * @readonly
     * @todo this is an export variable, really
     */
    private Artifact projectArtifact;

    /**
     * A list of inclusion filters for the compiler.
     *
     * @parameter
     */
    private Set includes = new HashSet();

    /**
     * A list of exclusion filters for the compiler.
     *
     * @parameter
     */
    private Set excludes = new HashSet();

    protected List getCompileSourceRoots()
    {
        return compileSourceRoots;
    }

    protected List getClasspathElements()
    {
        return classpathElements;
    }

    protected File getOutputDirectory()
    {
        return outputDirectory;
    }

    public void execute()
        throws MojoExecutionException, CompilationFailureException {
        super.execute();

        projectArtifact.setFile( outputDirectory );
    }

    protected SourceInclusionScanner getSourceInclusionScanner( int staleMillis )
    {
        SourceInclusionScanner scanner = null;

        if ( includes.isEmpty() && excludes.isEmpty() )
        {
            scanner = new StaleSourceScanner( staleMillis );
        }
        else
        {
            if ( includes.isEmpty() )
            {
                includes.add( "**/*.java" );
            }
            scanner = new StaleSourceScanner( staleMillis, includes, excludes );
        }

        return scanner;
    }

    protected SourceInclusionScanner getSourceInclusionScanner( String inputFileEnding )
    {
        SourceInclusionScanner scanner = null;

        if ( includes.isEmpty() && excludes.isEmpty() )
        {
            includes = Collections.singleton( "**/*." + inputFileEnding );
            scanner = new SimpleSourceInclusionScanner( includes, Collections.EMPTY_SET );
        }
        else
        {
            if ( includes.isEmpty() )
            {
                includes.add( "**/*." + inputFileEnding );
            }
            scanner = new SimpleSourceInclusionScanner( includes, excludes );
        }

        return scanner;
    }

}