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/* just an experiment - should be implemented in clojure later */
import java.io.*;
import javax.tools.*;
import java.nio.charset.Charset;
import java.util.Locale;
import java.util.UUID;
import java.util.Properties;
public class Geniface {
class ByteClassLoader extends ClassLoader{
String name; byte[] b;
ByteClassLoader (String name, byte[] b) {
this.b=b;
this.name=name;
}
Class getTheClass() {
return defineClass(name, b, 0, b.length);
}
}
private String temp_prefix;
private String my_uuid;
private String GeneratedText;
public Geniface (String temp_prefix) {
this.temp_prefix = temp_prefix;
this.my_uuid = "myuid" + UUID.randomUUID().toString().replace('-', '_');
this.GeneratedText =
"public interface " + my_uuid + " {";
}
public Geniface () {
this("/tmp");
}
public void addMethod (String name, int ObjectArgCount, boolean ret) {
/* Add a Method with ObjectArgCount arguments which either
* returns void if !ret, or returns an Object if ret */
GeneratedText +=
(ret ? "\n\tObject " : "\n\tvoid ") + name + "(";
for (int i = 0; i < ObjectArgCount; i++) {
GeneratedText += (i == 0 ? "" : ", ") + "Object arg" + i;
}
GeneratedText += ");";
}
public String getSourceString () {
return GeneratedText + "}";
}
public static byte[] getBytesFromFile(File file) throws IOException {
InputStream is = new FileInputStream(file);
// Get the size of the file
long length = file.length();
if (length > Integer.MAX_VALUE) {
// File is too large
}
// Create the byte array to hold the data
byte[] bytes = new byte[(int)length];
// Read in the bytes
int offset = 0;
int numRead = 0;
while (offset < bytes.length
&& (numRead=is.read(bytes, offset, bytes.length-offset)) >= 0) {
offset += numRead;
}
// Ensure all the bytes have been read in
if (offset < bytes.length) {
throw new IOException("Could not completely read file "+file.getName());
}
// Close the input stream and return bytes
is.close();
return bytes;
}
public Class compileToClass () {
try {
String javaname = temp_prefix + "/" + my_uuid + ".java";
String classname = temp_prefix + "/" + my_uuid + ".class";
FileOutputStream out = new FileOutputStream(javaname);
out.write(getSourceString().getBytes());
out.close();
File [] files1 = new File[]
{ new File(javaname) };
JavaCompiler compiler = ToolProvider.getSystemJavaCompiler();
DiagnosticCollector<JavaFileObject> diagnostics = new
DiagnosticCollector<JavaFileObject>();
StandardJavaFileManager fileManager =
compiler.getStandardFileManager(diagnostics, Locale.GERMANY,
Charset.forName("UTF-8"));
Iterable<? extends JavaFileObject> compilationUnits1 =
fileManager.getJavaFileObjectsFromFiles(java.util.Arrays.asList(files1));
compiler.getTask(null, fileManager, diagnostics, null, null,
compilationUnits1).call();
for (Diagnostic diagnostic : diagnostics.getDiagnostics())
{
System.out.println(diagnostic);
}
fileManager.close();
return new ByteClassLoader(my_uuid, getBytesFromFile (new File(classname))).getTheClass();
}
catch (IOException exn1) {
System.out.println("IOExn");
}
return null;
}
public static void main (String[] args) {
Geniface iface1 = new Geniface();
iface1.addMethod("Hallo", 10, false);
iface1.addMethod("Fuck", 2, true);
iface1.addMethod("valuesofbetawillgiverisetodom", 1, true);
iface1.addMethod("nilpferd", 0, false);
System.out.println(iface1.getSourceString());
System.out.println(iface1.compileToClass());
}
}
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