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The Object Composition library merges multiple Java objects into a single multi-subject object.
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/*
* Copyright (c) 2007-2008, James Leigh All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions are met:
*
* - Redistributions of source code must retain the above copyright notice, this
* list of conditions and the following disclaimer.
* - Redistributions in binary form must reproduce the above copyright notice,
* this list of conditions and the following disclaimer in the documentation
* and/or other materials provided with the distribution.
* - Neither the name of the openrdf.org nor the names of its contributors may
* be used to endorse or promote products derived from this software without
* specific prior written permission.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
* AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
* ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
* LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
* CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF
* SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS
* INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
* CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
* ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
* POSSIBILITY OF SUCH DAMAGE.
*
*/
package org.openrdf.repository.object.compiler.source;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileWriter;
import java.io.IOException;
import java.io.InputStream;
import java.io.InputStreamReader;
import java.io.InterruptedIOException;
import java.io.OutputStream;
import java.io.PrintWriter;
import java.lang.reflect.InvocationTargetException;
import java.lang.reflect.Method;
import java.util.ArrayList;
import java.util.List;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
/**
* Java Compiler that can detects the present of a JDK.
*
* @author James Leigh
*
*/
public class JavaCompiler {
final Logger logger = LoggerFactory.getLogger(JavaCompiler.class);
private String version = "5";
private boolean useTools = true;
public String getVersion() {
return version;
}
public void setVersion(String version) {
this.version = version;
}
public void compile(Iterable content, File dir, List classpath)
throws IOException {
List source = new ArrayList();
for (String name : content) {
String filename = name.replace('.', File.separatorChar);
source.add(new File(dir.getAbsoluteFile(), filename + ".java"));
}
File argfile = buildJavacArgfile(source, classpath);
try {
String[] args = new String[] { "@" + argfile.getAbsolutePath() };
if (javac(args) != 0)
throw new IOException("Could not compile");
} finally {
argfile.delete();
}
}
/**
* Try and run any available compiler. Try embedded compilers before
* external commands. Only fail if all compilers have be attempted.
*/
private int javac(String[] args) throws IOException {
int result = -1;
if (useTools) {
result = javaCompilerTool(args);
if (result < 0) {
result = javaSunTools(args);
}
}
if (result == 0)
return result;
result = javacCommand(args);
if (result == 0) {
useTools = false;
}
if (result >= 0)
return result;
throw new AssertionError("No Compiler Found");
}
/**
* Requires JDK6. This will sometimes try and write to user.dir and may
* throw an {@link java.security.AccessControlException}.
*/
private int javaCompilerTool(String[] args) {
try {
Class provider = forName("javax.tools.ToolProvider");
Method getJavaCompiler = provider
.getMethod("getSystemJavaCompiler");
Class tool = forName("javax.tools.Tool");
Method run = tool.getMethod("run", InputStream.class,
OutputStream.class, OutputStream.class, args.getClass());
Object compiler = getJavaCompiler.invoke(null);
if (compiler == null) {
return -1;
}
logger.debug("invoke javax.tools.JavaCompiler#run");
Object[] param = new Object[] { null, null, null, args };
Object result = run.invoke(compiler, param);
return ((Number) result).intValue();
} catch (InvocationTargetException e) {
logger.warn(e.toString());
return -1;
} catch (ClassNotFoundException e) {
return -1;
} catch (IllegalArgumentException e) {
return -1;
} catch (IllegalAccessException e) {
return -1;
} catch (SecurityException e) {
return -1;
} catch (NoSuchMethodException e) {
return -1;
}
}
private Class forName(String className) throws ClassNotFoundException {
ClassLoader cl = getClass().getClassLoader();
if (cl == null)
return Class.forName(className);
synchronized (cl) {
return Class.forName(className, true, cl);
}
}
/**
* Requires Sun tools.jar in class-path.
*/
private int javaSunTools(String[] args) {
try {
Class sun;
try {
sun = forName("com.sun.tools.javac.Main");
} catch (ClassNotFoundException e) {
return -1;
}
Method method = sun.getMethod("compile", args.getClass());
logger.debug("invoke com.sun.tools.javac.Main#compile");
Object result = method.invoke(null, new Object[] { args });
return ((Number) result).intValue();
} catch (InvocationTargetException e) {
logger.warn(e.toString());
return -1;
} catch (IllegalArgumentException e) {
return -1;
} catch (IllegalAccessException e) {
return -1;
} catch (SecurityException e) {
return -1;
} catch (NoSuchMethodException e) {
return -1;
}
}
/**
* Requires JDK installation.
*
* @throws IOException
*/
private int javacCommand(String[] args) throws IOException {
String javac = findJavac();
if (javac == null)
return -1;
return exec(javac, args);
}
private String findJavac() {
String javac = findJavac(System.getProperty("jdk.home"));
if (javac == null)
javac = findJavac(System.getProperty("java.home"));
if (javac == null)
javac = findJavac(System.getenv("JAVA_HOME"));
if (javac == null) {
String systemPath = System.getenv("PATH");
for (String path : systemPath.split(File.pathSeparator)) {
File file = new File(path, "javac");
if (exists(file))
return file.getPath();
}
}
return javac;
}
private String findJavac(String home) {
if (home == null)
return null;
File javac = new File(new File(home, "bin"), "javac");
if (exists(javac))
return javac.getPath();
javac = new File(new File(home, "bin"), "javac.exe");
if (exists(javac))
return javac.getPath();
File parent = new File(home).getParentFile();
javac = new File(new File(parent, "bin"), "javac");
if (exists(javac))
return javac.getPath();
javac = new File(new File(parent, "bin"), "javac.exe");
if (exists(javac))
return javac.getPath();
for (File dir : parent.listFiles()) {
javac = new File(new File(dir, "bin"), "javac");
if (exists(javac))
return javac.getPath();
javac = new File(new File(dir, "bin"), "javac.exe");
if (exists(javac))
return javac.getPath();
}
return null;
}
private boolean exists(File javac) {
try {
return javac.exists();
} catch (SecurityException e) {
logger.warn(e.getMessage());
return false;
}
}
private int exec(String cmd, String[] args) throws IOException {
logger.debug("exec {}", cmd);
String[] cmdArray = new String[1 + args.length];
cmdArray[0] = cmd;
System.arraycopy(args, 0, cmdArray, 1, args.length);
File wd = File.createTempFile("javac", "dir");
wd.delete();
wd = wd.getParentFile();
final Process exec = Runtime.getRuntime().exec(cmdArray, null, wd);
try {
Thread gobbler = new Thread() {
@Override
public void run() {
try {
InputStream in = exec.getInputStream();
try {
InputStreamReader isr = new InputStreamReader(in);
BufferedReader br = new BufferedReader(isr);
String line = null;
while ((line = br.readLine()) != null) {
System.out.println(line);
}
} finally {
in.close();
}
} catch (IOException ioe) {
logger.error(ioe.getMessage(), ioe);
}
}
};
gobbler.start();
InputStream stderr = exec.getErrorStream();
try {
exec.getOutputStream().close();
InputStreamReader isr = new InputStreamReader(stderr);
BufferedReader br = new BufferedReader(isr);
String line = null;
while ((line = br.readLine()) != null) {
System.err.println(line);
}
} finally {
stderr.close();
}
try {
return exec.waitFor();
} catch (InterruptedException cause) {
InterruptedIOException e = new InterruptedIOException(cause.getMessage());
e.initCause(cause);
throw e;
}
} finally {
exec.destroy();
}
}
private File buildJavacArgfile(List sources, List classpath) throws IOException {
File args = File.createTempFile("javac", "args");
PrintWriter w = new PrintWriter(new FileWriter(args));
try {
w.println("-nowarn");
w.println("-source");
w.println(version);
w.println("-target");
w.println(version);
w.println("-classpath");
w.print("\"");
for (File jar : classpath) {
w.print(jar.getAbsolutePath().replace("\\", "\\\\"));
w.print(File.pathSeparatorChar);
}
w.println("\"");
for (int i = 0, n = sources.size(); i < n; i++) {
w.print("\"");
w.print(sources.get(i).getAbsolutePath().replace("\\", "\\\\"));
w.println("\"");
}
} finally {
w.close();
}
return args;
}
}