public static boolean externalCompile()

in src/main/java/org/apache/xmlbeans/impl/tool/CodeGenUtil.java [141:279]
108 lines of code
28 McCabe index (conditional complexity)

    public static boolean externalCompile(List<File> srcFiles, File outdir, File[] cp, boolean debug, String javacPath, String genver, String memStart, String memMax,
                                          boolean quiet, boolean verbose, String sourceCodeEncoding) {
        List<String> args = new ArrayList<>();

        File javac = findJavaTool(javacPath == null ? DEFAULT_COMPILER : javacPath);
        assert (javac.exists()) : "compiler not found " + javac;
        args.add(javac.getAbsolutePath());

        if (outdir == null) {
            outdir = new File(".");
        } else {
            args.add("-d");
            args.add(quoteAndEscapeFilename(outdir.getAbsolutePath()));
        }

        if (cp == null) {
            cp = systemClasspath();
        }

        if(sourceCodeEncoding != null && !sourceCodeEncoding.isEmpty()) {
            args.add("-encoding");
            args.add(sourceCodeEncoding);
        }

        if (cp.length > 0) {
            StringBuilder classPath = new StringBuilder();
            // Add the output directory to the classpath.  We do this so that
            // javac will be able to find classes that were compiled
            // previously but are not in the list of sources this time.
            classPath.append(outdir.getAbsolutePath());

            // Add everything on our classpath.
            for (File file : cp) {
                classPath.append(File.pathSeparator);
                classPath.append(file.getAbsolutePath());
            }

            args.add("-classpath");

            // bizarre.  javac expects backslash escaping if we quote the classpath
            args.add(quoteAndEscapeFilename(classPath.toString()));
        }

        if (genver == null) {
            genver = "1.8";
        }

        args.add("-source");
        args.add(genver);

        args.add("-target");
        args.add(genver);

        args.add(debug ? "-g" : "-g:none");

        if (verbose) {
            args.add("-verbose");
        }

        addAllJavaFiles(srcFiles, args);

        File clFile = null;
        try {
            clFile = Files.createTempFile(IOUtil.getTempDir(), "javac", ".tmp").toFile();
            try (Writer fw = Files.newBufferedWriter(clFile.toPath(), Charset.defaultCharset())) {
                Iterator<String> i = args.iterator();
                for (i.next(); i.hasNext(); ) {
                    String arg = i.next();
                    fw.write(arg);
                    fw.write('\n');
                }
            }
            List<String> newargs = new ArrayList<>();
            newargs.add(args.get(0));

            if (memStart != null && !memStart.isEmpty()) {
                newargs.add("-J-Xms" + memStart);
            }
            if (memMax != null && !memMax.isEmpty()) {
                newargs.add("-J-Xmx" + memMax);
            }

            newargs.add("@" + clFile.getAbsolutePath());
            args = newargs;
        } catch (Exception e) {
            System.err.println("Could not create command-line file for javac");
        }

        try {
            String[] strArgs = args.toArray(new String[0]);

            if (verbose) {
                System.out.print("compile command:");
                for (String strArg : strArgs) {
                    System.out.print(" " + strArg);
                }
                System.out.println();
            }

            final Process proc = Runtime.getRuntime().exec(strArgs);

            StringBuilder errorBuffer = new StringBuilder();
            StringBuilder outputBuffer = new StringBuilder();

            Thread out = copy(proc.getInputStream(), outputBuffer);
            Thread err = copy(proc.getErrorStream(), errorBuffer);

            proc.waitFor();

            if (verbose || proc.exitValue() != 0) {
                if (outputBuffer.length() > 0) {
                    System.out.println(outputBuffer.toString());
                    System.out.flush();
                }
                if (errorBuffer.length() > 0) {
                    System.err.println(errorBuffer.toString());
                    System.err.flush();
                }

                if (proc.exitValue() != 0) {
                    return false;
                }
            }
        } catch (Throwable e) {
            if (ExceptionUtil.isFatal(e)) {
                ExceptionUtil.rethrow(e);
            }
            System.err.println(e.toString());
            System.err.println(e.getCause());
            e.printStackTrace(System.err);
            return false;
        } finally {
            if (!debug && clFile != null) {
                clFile.delete();
            }
        }

        return true;
    }