groovyc.java

大名鼎鼎的java动态脚本语言。已经通过了sun的认证

     */
    public void setClasspath(Path classpath) {
        if (compileClasspath == null) {
            compileClasspath = classpath;
        }
        else {
            compileClasspath.append(classpath);
        }
    }

    /**
     * Gets the classpath to be used for this compilation.
     * @return the class path
     */
    public Path getClasspath() {
        return compileClasspath;
    }

    /**
     * Adds a path to the classpath.
     * @return a class path to be configured
     */
    public Path createClasspath() {
        if (compileClasspath == null) {
            compileClasspath = new Path(getProject());
        }
        return compileClasspath.createPath();
    }

    /**
     * Adds a reference to a classpath defined elsewhere.
     * @param r a reference to a classpath
     */
    public void setClasspathRef(Reference r) {
        createClasspath().setRefid(r);
    }

    public String createEncoding() {
        if (encoding == null) {
            encoding = System.getProperty("file.encoding");
        }
        return encoding;
    }

    public void setEncoding(String encoding) {
        this.encoding = encoding;
    }

    public String getEncoding() {
        return encoding;
    }

    /**
     * If true, list the source files being handed off to the compiler.
     * @param list if true list the source files
     */
    public void setListfiles(boolean list) {
        listFiles = list;
    }

    /**
     * Get the listfiles flag.
     * @return the listfiles flag
     */
    public boolean getListfiles() {
        return listFiles;
    }

    /**
     * Indicates whether the build will continue
     * even if there are compilation errors; defaults to true.
     * @param fail if true halt the build on failure
     */
    public void setFailonerror(boolean fail) {
        failOnError = fail;
    }

    /**
     * @ant.attribute ignore="true"
     * @param proceed inverse of failoferror
     */
    public void setProceed(boolean proceed) {
        failOnError = !proceed;
    }

    /**
     * Gets the failonerror flag.
     * @return the failonerror flag
     */
    public boolean getFailonerror() {
        return failOnError;
    }

    /**
     * Executes the task.
     * @exception BuildException if an error occurs
     */
    public void execute() throws BuildException {
        checkParameters();
        resetFileLists();

        // scan source directories and dest directory to build up
        // compile lists
        String[] list = src.list();
        for (int i = 0; i < list.length; i++) {
            File srcDir = getProject().resolveFile(list[i]);
            if (!srcDir.exists()) {
                throw new BuildException("srcdir \"" + srcDir.getPath() + "\" does not exist!", getLocation());
            }

            DirectoryScanner ds = this.getDirectoryScanner(srcDir);
            String[] files = ds.getIncludedFiles();

            scanDir(srcDir, destDir != null ? destDir : srcDir, files);
        }

        compile();
    }

    /**
     * Clear the list of files to be compiled and copied..
     */
    protected void resetFileLists() {
        compileList = new File[0];
    }

    /**
     * Scans the directory looking for source files to be compiled.
     * The results are returned in the class variable compileList
     *
     * @param srcDir   The source directory
     * @param destDir  The destination directory
     * @param files    An array of filenames
     */
    protected void scanDir(File srcDir, File destDir, String[] files) {
        GlobPatternMapper m = new GlobPatternMapper();
        m.setFrom("*.groovy");
        m.setTo("*.class");
        SourceFileScanner sfs = new SourceFileScanner(this);
        File[] newFiles = sfs.restrictAsFiles(files, srcDir, destDir, m);

        if (newFiles.length > 0) {
            File[] newCompileList = new File[compileList.length + newFiles.length];
            System.arraycopy(compileList, 0, newCompileList, 0, compileList.length);
            System.arraycopy(newFiles, 0, newCompileList, compileList.length, newFiles.length);
            compileList = newCompileList;
        }
    }

    /**
     * Gets the list of files to be compiled.
     * @return the list of files as an array
     */
    public File[] getFileList() {
        return compileList;
    }

    protected void checkParameters() throws BuildException {
        if (src == null) {
            throw new BuildException("srcdir attribute must be set!", getLocation());
        }
        if (src.size() == 0) {
            throw new BuildException("srcdir attribute must be set!", getLocation());
        }

        if (destDir != null && !destDir.isDirectory()) {
            throw new BuildException(
                "destination directory \"" + destDir + "\" does not exist " + "or is not a directory",
                getLocation());
        }

        if (encoding != null && !Charset.isSupported(encoding)) {
            throw new BuildException("encoding \"\" not supported");
        }
    }

    protected void compile() {

        if (compileList.length > 0) {
            log(
                "Compiling "
                    + compileList.length
                    + " source file"
                    + (compileList.length == 1 ? "" : "s")
                    + (destDir != null ? " to " + destDir : ""));

            if (listFiles) {
                for (int i = 0; i < compileList.length; i++) {
                    String filename = compileList[i].getAbsolutePath();

                    // TODO this logging does not seem to appear in the maven build??
                    // COMMENT Hein: This is not ant's problem;
                    // fix it in maven instead if you really need this from maven!
                    log(filename);
//                    System.out.println("compiling: " + filename);
                }
            }

            try {
                Path classpath = getClasspath();
                if (classpath != null) {
                    configuration.setClasspath(classpath.toString());
                }
                configuration.setTargetDirectory(destDir);

                if (encoding != null) {
                    configuration.setSourceEncoding(encoding);
                }

                CompilationUnit unit = new CompilationUnit(configuration, null, buildClassLoaderFor());
                unit.addSources(compileList);
                unit.compile();
            }
            catch (Exception e) {

                StringWriter writer = new StringWriter();
                new ErrorReporter( e, false ).write( new PrintWriter(writer) );
                String message = writer.toString();

                if (failOnError) {
                    throw new BuildException(message, e, getLocation());
                }
                else {
                    log(message, Project.MSG_ERR);
                }

            }
        }
    }

    private GroovyClassLoader buildClassLoaderFor() {
        ClassLoader parent = this.getClass().getClassLoader();
        if (parent instanceof AntClassLoader) {
            AntClassLoader antLoader = (AntClassLoader) parent;
            String[] pathElm = antLoader.getClasspath().split(File.pathSeparator);
            List classpath = configuration.getClasspath();
            /*
             * Iterate over the classpath provided to groovyc, and add any missing path
             * entries to the AntClassLoader.  This is a workaround, since for some reason
             * 'directory' classpath entries were not added to the AntClassLoader' classpath. 
             */
            for (Iterator iter = classpath.iterator(); iter.hasNext();) {
                String cpEntry = (String) iter.next();
                boolean found = false;
                for (int i = 0; i < pathElm.length; i++) {
                    if (cpEntry.equals(pathElm[i])) {
                        found = true;
                        break;
                    }
                }
                if (!found)
                    antLoader.addPathElement(cpEntry);
            }
        }
        return new GroovyClassLoader(parent, configuration);
    }

}