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Groovy: A powerful, dynamic language for the JVM
/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.codehaus.groovy.tools.javac;
import groovy.lang.GroovyClassLoader;
import java.io.File;
import java.io.PrintWriter;
import java.io.StringWriter;
import java.lang.reflect.Method;
import java.lang.reflect.InvocationTargetException;
import java.util.*;
import java.net.URLClassLoader;
import java.net.URL;
import java.net.URISyntaxException;
import org.codehaus.groovy.control.CompilationUnit;
import org.codehaus.groovy.control.CompilerConfiguration;
import org.codehaus.groovy.control.messages.ExceptionMessage;
import org.codehaus.groovy.control.messages.SimpleMessage;
import org.codehaus.groovy.runtime.DefaultGroovyMethods;
public class JavacJavaCompiler implements JavaCompiler {
private CompilerConfiguration config;
public JavacJavaCompiler(CompilerConfiguration config) {
this.config = config;
}
public void compile(List files, CompilationUnit cu) {
String[] javacParameters = makeParameters(files, cu.getClassLoader());
StringWriter javacOutput = null;
int javacReturnValue = 0;
try {
Class javac = findJavac(cu);
Method method = null;
try {
method = javac.getMethod("compile", new Class[]{String[].class, PrintWriter.class});
javacOutput = new StringWriter();
PrintWriter writer = new PrintWriter(javacOutput);
Object ret = method.invoke(null, javacParameters, writer);
javacReturnValue = (Integer) ret;
} catch (NoSuchMethodException e) { }
if (method == null) {
method = javac.getMethod("compile", new Class[]{String[].class});
Object ret = method.invoke(null, new Object[]{javacParameters});
javacReturnValue = (Integer) ret;
}
} catch (InvocationTargetException ite) {
cu.getErrorCollector().addFatalError(new ExceptionMessage((Exception) ite.getCause(), true, cu));
} catch (Exception e) {
cu.getErrorCollector().addFatalError(new ExceptionMessage(e, true, cu));
}
if (javacReturnValue != 0) {
switch (javacReturnValue) {
case 1: addJavacError("Compile error during compilation with javac.", cu, javacOutput); break;
case 2: addJavacError("Invalid commandline usage for javac.", cu, javacOutput); break;
case 3: addJavacError("System error during compilation with javac.", cu, javacOutput); break;
case 4: addJavacError("Abnormal termination of javac.", cu, javacOutput); break;
default: addJavacError("unexpected return value by javac.", cu, javacOutput); break;
}
} else {
// print warnings if any
System.out.print(javacOutput);
}
}
private static void addJavacError(String header, CompilationUnit cu, StringWriter msg) {
if (msg != null) {
header = header + "\n" + msg.getBuffer().toString();
} else {
header = header +
"\nThis javac version does not support compile(String[],PrintWriter), " +
"so no further details of the error are available. The message error text " +
"should be found on System.err.\n";
}
cu.getErrorCollector().addFatalError(new SimpleMessage(header, cu));
}
private String[] makeParameters(List files, GroovyClassLoader parentClassLoader) {
Map options = config.getJointCompilationOptions();
LinkedList paras = new LinkedList();
File target = config.getTargetDirectory();
if (target == null) target = new File(".");
// defaults
paras.add("-d");
paras.add(target.getAbsolutePath());
paras.add("-sourcepath");
paras.add(((File) options.get("stubDir")).getAbsolutePath());
// add flags
String[] flags = (String[]) options.get("flags");
if (flags != null) {
for (String flag : flags) {
paras.add('-' + flag);
}
}
boolean hadClasspath = false;
// add namedValues
String[] namedValues = (String[]) options.get("namedValues");
if (namedValues != null) {
for (int i = 0; i < namedValues.length; i += 2) {
String name = namedValues[i];
if (name.equals("classpath")) hadClasspath = true;
paras.add('-' + name);
paras.add(namedValues[i + 1]);
}
}
// append classpath if not already defined
if (!hadClasspath) {
// add all classpaths that compilation unit sees
StringBuilder resultPath = new StringBuilder(DefaultGroovyMethods.join((Iterable)config.getClasspath(), File.pathSeparator));
ClassLoader cl = parentClassLoader;
while (cl != null) {
if (cl instanceof URLClassLoader) {
for (URL u : ((URLClassLoader) cl).getURLs()) {
try {
resultPath.append(File.pathSeparator);
resultPath.append(new File(u.toURI()).getPath());
} catch (URISyntaxException e) {
// ignore it
}
}
}
cl = cl.getParent();
}
paras.add("-classpath");
paras.add(resultPath.toString());
}
// files to compile
paras.addAll(files);
return paras.toArray(new String[paras.size()]);
}
private Class findJavac(CompilationUnit cu) throws ClassNotFoundException {
String main = "com.sun.tools.javac.Main";
try {
return Class.forName(main);
} catch (ClassNotFoundException e) {}
try {
ClassLoader cl = this.getClass().getClassLoader();
return cl.loadClass(main);
} catch (ClassNotFoundException e) {}
try {
return ClassLoader.getSystemClassLoader().loadClass(main);
} catch (ClassNotFoundException e) {}
try {
return cu.getClassLoader().getParent().loadClass(main);
} catch (ClassNotFoundException e3) {}
// couldn't find compiler - try to find tools.jar
// based on java.home setting
String javaHome = System.getProperty("java.home");
if (javaHome.toLowerCase(Locale.US).endsWith("jre")) {
javaHome = javaHome.substring(0, javaHome.length() - 4);
}
File toolsJar = new File((javaHome + "/lib/tools.jar"));
if (toolsJar.exists()) {
GroovyClassLoader loader = cu.getClassLoader();
loader.addClasspath(toolsJar.getAbsolutePath());
return loader.loadClass(main);
}
throw new ClassNotFoundException("unable to locate the java compiler com.sun.tools.javac.Main, please change your classloader settings");
}
}