diff options
Diffstat (limited to 'Geniface.java')
| -rw-r--r-- | Geniface.java | 136 |
1 files changed, 136 insertions, 0 deletions
diff --git a/Geniface.java b/Geniface.java new file mode 100644 index 0000000..c307050 --- /dev/null +++ b/Geniface.java @@ -0,0 +1,136 @@ +/* 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(System.getProperty("java.io.tmpdir")); + } + + 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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