Examples with JavaCodeCompiler org.knime.ext.sun.nodes.script.compile.JavaCodeCompiler used on opensource projects

Example 1 with JavaCodeCompiler

use of org.knime.ext.sun.nodes.script.compile.JavaCodeCompiler in project knime-core by knime.

the class Expression method createClass.

/* Called from the constructor. */
@SuppressWarnings("unchecked")
private Class<? extends AbstractSnippetExpression> createClass(final String body, final JavaScriptingSettings settings) throws CompilationFailedException {
    Class<?> rType = settings.getReturnType();
    int version = settings.getExpressionVersion();
    boolean isArrayReturn = settings.isArrayReturn();
    String header = settings.getHeader();
    String source;
    String name = "Expression" + COUNTER.getAndIncrement();
    String[] imports = null != settings.getImports() ? settings.getImports() : getDefaultImports();
    // Generate the well known source of the Expression
    switch(version) {
        case VERSION_1X:
            source = generateSourceVersion1(name, body, rType, imports);
            break;
        case VERSION_2X:
            source = generateSourceVersion2(name, body, header, rType, imports, isArrayReturn);
            break;
        default:
            throw new CompilationFailedException("Unknown snippet version number: " + version);
    }
    try {
        ensureTempClassPathExists();
    } catch (IOException e1) {
        throw new CompilationFailedException("Unable to copy required class path files", e1);
    }
    File[] additionalJarFiles;
    try {
        additionalJarFiles = settings.getJarFilesAsFiles();
    } catch (InvalidSettingsException e1) {
        throw new CompilationFailedException(e1.getMessage(), e1);
    }
    File[] classPathFiles = new File[additionalJarFiles.length + 1];
    classPathFiles[0] = tempClassPath;
    System.arraycopy(additionalJarFiles, 0, classPathFiles, 1, additionalJarFiles.length);
    JavaCodeCompiler compiler = new JavaCodeCompiler();
    compiler.setSources(new InMemorySourceJavaFileObject(name, source));
    compiler.setClasspaths(classPathFiles);
    compiler.compile();
    ClassLoader loader = compiler.createClassLoader(compiler.getClass().getClassLoader());
    try {
        return (Class<? extends AbstractSnippetExpression>) loader.loadClass(name);
    } catch (ClassNotFoundException e) {
        throw new CompilationFailedException("Could not load generated class", e);
    }
}