NoxiusCompiler.java

package org.jboss.noxius.bootstrap;

import javax.tools.DiagnosticCollector;
import javax.tools.JavaCompiler;
import javax.tools.JavaFileObject;
import javax.tools.StandardJavaFileManager;
import javax.tools.ToolProvider;
import java.io.Writer;
import java.net.URISyntaxException;
import java.net.URL;
import java.util.Arrays;

/**
 * @author <a href="mailto:[email protected]">Carlo de Wolf</a>
 */
public class NoxiusCompiler {
    static final JavaCompiler COMPILER = ToolProvider.getSystemJavaCompiler();

    public Class<?> compile(final URL resource, final String className) throws URISyntaxException, ClassNotFoundException, NoxiusCompileException {
        return compile(resource, className, null);
    }

    public Class<?> compile(final URL resource, final String className, final Iterable<String> options) throws URISyntaxException, ClassNotFoundException, NoxiusCompileException {
        final DiagnosticCollector<JavaFileObject> diagnostics = new DiagnosticCollector<JavaFileObject>();
        final StandardJavaFileManager standardJavaFileManager = COMPILER.getStandardFileManager(diagnostics, null, null);
        final Iterable<URLJavaFileObject> compilationUnits = Arrays.asList(new URLJavaFileObject(resource, className));
        final NoxiusFileManager fileManager = new NoxiusFileManager(standardJavaFileManager, compilationUnits);
        final Writer out = null; // System.err
        final Iterable<String> classes = null;
//        System.out.println("options = " + options);
        final boolean result = ToolProvider.getSystemJavaCompiler().getTask(out, fileManager, diagnostics, options, classes, compilationUnits).call();
        if (!result)
            throw new NoxiusCompileException("compilation failed", diagnostics.getDiagnostics());
        final ClassLoader parent = Thread.currentThread().getContextClassLoader();
        final NoxiusClassLoader classLoader = new NoxiusClassLoader(parent, fileManager);
        return Class.forName(className, true, classLoader);
    }
}