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Java Source Code / Java Documentation » Rule Engine » drolls Rule Engine » org.drools.asm.util 
Source Cross Reference  Class Diagram Java Document (Java Doc) 


java.lang.Object
   org.drools.asm.util.AbstractVisitor
      org.drools.asm.util.ASMifierAbstractVisitor
         org.drools.asm.util.ASMifierClassVisitor

ASMifierClassVisitor
public class ASMifierClassVisitor extends ASMifierAbstractVisitor implements ClassVisitor(Code)
A ClassVisitor that prints the ASM code that generates the classes it visits. This class visitor can be used to quickly write ASM code to generate some given bytecode:
  • write the Java source code equivalent to the bytecode you want to generate;
  • compile it with javac;
  • make a ASMifierClassVisitor visit this compiled class (see the ASMifierClassVisitor.main main method);
  • edit the generated source code, if necessary.
The source code printed when visiting the Hello class is the following:

 import org.objectweb.asm.*;
 public class HelloDump implements Opcodes {
 public static byte[] dump() throws Exception {
 ClassWriter cw = new ClassWriter(false);
 FieldVisitor fv;
 MethodVisitor mv;
 AnnotationVisitor av0;
 cw.visit(49,
 ACC_PUBLIC + ACC_SUPER,
 "Hello",
 null,
 "java/lang/Object",
 null);
 cw.visitSource("Hello.java", null);
 {
 mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
 mv.visitVarInsn(ALOAD, 0);
 mv.visitMethodInsn(INVOKESPECIAL,
 "java/lang/Object",
 "<init>",
 "()V");
 mv.visitInsn(RETURN);
 mv.visitMaxs(1, 1);
 mv.visitEnd();
 }
 {
 mv = cw.visitMethod(ACC_PUBLIC + ACC_STATIC,
 "main",
 "([Ljava/lang/String;)V",
 null,
 null);
 mv.visitFieldInsn(GETSTATIC,
 "java/lang/System",
 "out",
 "Ljava/io/PrintStream;");
 mv.visitLdcInsn("hello");
 mv.visitMethodInsn(INVOKEVIRTUAL,
 "java/io/PrintStream",
 "println",
 "(Ljava/lang/String;)V");
 mv.visitInsn(RETURN);
 mv.visitMaxs(2, 1);
 mv.visitEnd();
 }
 cw.visitEnd();
 return cw.toByteArray();
 }
 }
 
where Hello is defined by:

 public class Hello {
 public static void main(String[] args) {
 System.out.println("hello");
 }
 }
 

author:
   Eric Bruneton
author:
   Eugene Kuleshov


Field Summary
final protected  PrintWriterpw
     The print writer to be used to print the class.

Constructor Summary
public  ASMifierClassVisitor(PrintWriter pw)
     Constructs a new ASMifierClassVisitor object.

Method Summary
 voidappendAccess(int access)
     Appends a string representation of the given access modifiers to ASMifierClassVisitor.buf buf .
static  voidappendConstant(StringBuffer buf, Object cst)
     Appends a string representation of the given constant to the given buffer.
public static  voidmain(String[] args)
     Prints the ASM source code to generate the given class to the standard output.
public  voidvisit(int version, int access, String name, String signature, String superName, String[] interfaces)
    
public  AnnotationVisitorvisitAnnotation(String desc, boolean visible)
    
public  voidvisitEnd()
    
public  FieldVisitorvisitField(int access, String name, String desc, String signature, Object value)
    
public  voidvisitInnerClass(String name, String outerName, String innerName, int access)
    
public  MethodVisitorvisitMethod(int access, String name, String desc, String signature, String[] exceptions)
    
public  voidvisitOuterClass(String owner, String name, String desc)
    
public  voidvisitSource(String file, String debug)
    

Field Detail
pw
final protected PrintWriter pw(Code)
The print writer to be used to print the class.




Constructor Detail
ASMifierClassVisitor
public ASMifierClassVisitor(PrintWriter pw)(Code)
Constructs a new ASMifierClassVisitor object.
Parameters:
  pw - the print writer to be used to print the class.




Method Detail
appendAccess
void appendAccess(int access)(Code)
Appends a string representation of the given access modifiers to ASMifierClassVisitor.buf buf .
Parameters:
  access - some access modifiers.



appendConstant
static void appendConstant(StringBuffer buf, Object cst)(Code)
Appends a string representation of the given constant to the given buffer.
Parameters:
  buf - a string buffer.
Parameters:
  cst - an java.lang.Integer Integer, java.lang.FloatFloat, java.lang.Long Long,java.lang.Double Double or String String object.May be null.



main
public static void main(String[] args) throws Exception(Code)
Prints the ASM source code to generate the given class to the standard output.

Usage: ASMifierClassVisitor [-debug] <fully qualified class name or class file name>
Parameters:
  args - the command line arguments.
throws:
  Exception - if the class cannot be found, or if an IO exceptionoccurs.




visit
public void visit(int version, int access, String name, String signature, String superName, String[] interfaces)(Code)



visitAnnotation
public AnnotationVisitor visitAnnotation(String desc, boolean visible)(Code)



visitEnd
public void visitEnd()(Code)



visitField
public FieldVisitor visitField(int access, String name, String desc, String signature, Object value)(Code)



visitInnerClass
public void visitInnerClass(String name, String outerName, String innerName, int access)(Code)



visitMethod
public MethodVisitor visitMethod(int access, String name, String desc, String signature, String[] exceptions)(Code)



visitOuterClass
public void visitOuterClass(String owner, String name, String desc)(Code)



visitSource
public void visitSource(String file, String debug)(Code)



Fields inherited from org.drools.asm.util.ASMifierAbstractVisitor
HashMap labelNames(Code)(Java Doc)
protected String name(Code)(Java Doc)

Methods inherited from org.drools.asm.util.ASMifierAbstractVisitor
void appendConstant(Object cst)(Code)(Java Doc)
static void appendConstant(StringBuffer buf, Object cst)(Code)(Java Doc)
public AnnotationVisitor visitAnnotation(String desc, boolean visible)(Code)(Java Doc)
public void visitAttribute(Attribute attr)(Code)(Java Doc)
public void visitEnd()(Code)(Java Doc)

Fields inherited from org.drools.asm.util.AbstractVisitor
final public static String[] OPCODES(Code)(Java Doc)
final public static String[] TYPES(Code)(Java Doc)
final protected StringBuffer buf(Code)(Java Doc)
final public List text(Code)(Java Doc)

Methods inherited from org.drools.asm.util.AbstractVisitor
public static void appendString(StringBuffer buf, String s)(Code)(Java Doc)
public static Attribute[] getDefaultAttributes()(Code)(Java Doc)
public List getText()(Code)(Java Doc)
void printList(PrintWriter pw, List l)(Code)(Java Doc)

Methods inherited from java.lang.Object
native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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