Example usage for javax.tools ToolProvider getSystemJavaCompiler

Introduction

In this page you can find the example usage for javax.tools ToolProvider getSystemJavaCompiler.

Prototype

public static JavaCompiler getSystemJavaCompiler()

Source Link

Document

Returns the Java™ programming language compiler provided with this platform.

Usage

From source file:org.wso2.carbon.kernel.annotationprocessor.AnnotationProcessorTest.java

@BeforeClass
public void initClass() {
    //get the java compiler.
    compiler = ToolProvider.getSystemJavaCompiler();
    //configure the diagnostics collector.
    collector = new DiagnosticCollector<>();
    fileManager = compiler.getStandardFileManager(collector, Locale.US, Charset.forName("UTF-8"));
    packagePath = Paths.get("src", "test", "java", "org", "wso2", "carbon", "kernel", "annotationprocessor")
            .toString();//ww  w. j  a  v  a2s . co m
    classesToCompile = new String[] { Paths.get(packagePath, "Configurations.java").toString() };
}

From source file:plaid.compilerjava.CompilerCore.java

private void generateCode(List<CompilationUnit> cus, final PackageRep plaidpath) throws Exception {
    if (cc.isVerbose()) {
        System.out.println("Generating code.");
    }//from www.j  a v a  2  s .  c  o m

    final List<File> allFiles = new ArrayList<File>();
    ExecutorService taskPool = Executors.newFixedThreadPool(Runtime.getRuntime().availableProcessors());
    for (final CompilationUnit cu : cus) {
        if (!cc.forceRecompile()) {
            boolean rebuild = false;
            for (Decl d : cu.getDecls()) {
                //System.out.println(d);
                StringBuilder packageName = new StringBuilder();
                for (String s : cu.getPackageName()) {
                    packageName.append(s);
                    packageName.append(System.getProperty("file.separator"));
                }
                File targetFile = new File(cc.getTempDir() + System.getProperty("file.separator") + packageName
                        + d.getName() + ".java");
                if (!targetFile.exists() || targetFile.lastModified() < cu.getSourceFile().lastModified()) {
                    rebuild = true;
                    break;
                }
            }
            if (!rebuild) {
                if (cc.isVerbose()) {
                    System.out.println("file up-to-date : " + cu.getSourceFile());
                }
                continue;
            }
            if (cc.isVerbose()) {
                System.out.println("Rebuild: " + cu.getSourceFile());
            }
        }
        Callable<Object> task = new Callable<Object>() {
            @Override
            public Object call() throws Exception {
                try {
                    if (cc.isVerbose())
                        System.out.println("Generating code for:\n" + cu);
                    List<File> fileList = cu.codegen(cc, plaidpath);

                    synchronized (allFiles) {
                        allFiles.addAll(fileList);
                    }
                } catch (PlaidException p) {
                    System.err.println("Error while compiling " + cu.getSourceFile().toString() + ":");
                    System.err.println("");
                    printExceptionInformation(p);
                }
                return null;
            }
        };
        taskPool.submit(task);
    }
    taskPool.shutdown();
    while (!taskPool.isTerminated()) {
        taskPool.awaitTermination(1, TimeUnit.MINUTES);
    }

    if (!cc.isKeepTemporaryFiles()) {
        for (File f : allFiles) {
            f.deleteOnExit();
        }
    }

    if (cc.isVerbose()) {
        System.out.println("invoke Java compiler");
    }
    if (cc.isInvokeCompiler() && allFiles.size() > 0) {
        JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
        StandardJavaFileManager fileManager = compiler.getStandardFileManager(null, null, null);
        Iterable<? extends JavaFileObject> fileObjects = fileManager.getJavaFileObjectsFromFiles(allFiles);

        List<String> optionList = new ArrayList<String>();
        optionList.addAll(Arrays.asList("-target", "1.5"));
        // Set compiler's classpath to be same as the runtime's
        optionList.addAll(Arrays.asList("-classpath", System.getProperty("java.class.path")));
        // TODO: Add a separate compiler flag for this.
        optionList.addAll(Arrays.asList("-d", cc.getOutputDir()));
        //         optionList.add("-verbose");

        // Invoke the compiler
        CompilationTask task = compiler.getTask(null, null, null, optionList, null, fileObjects);
        Boolean resultCode = task.call();
        if (!resultCode.booleanValue())
            throw new RuntimeException("Error while compiling generated Java files.");
    }
}