Example usage for org.aspectj.apache.bcel Repository lookupClass

Introduction

In this page you can find the example usage for org.aspectj.apache.bcel Repository lookupClass.

Prototype

public static JavaClass lookupClass(String class_name) 

Source Link

Document

Lookup class somewhere found on your CLASSPATH, or whereever the repository instance looks for it.

Usage

From source file:br.jabuti.instrumenter.bytecode.bcel.ASMInstrumenter.java

License:Open Source License

/**
 * This is a test driver. It takes a class name on args[0], inserts
 * some instructions in several points of each method in the class
 * and then dump the instrumented class to "new_"<original_name> 
 * file//from  w  w w. j  av  a  2 s  .c  o m
 */

public static void main(String args[]) throws Exception {
    // o melhor eh chamar com java ... ASMInstrumenter samples\arquivo.class
    // assim ele vai criar um novo arquivo new_samples\arquivo.class que
    // se pode testar

    JavaClass java_class;

    if ((java_class = Repository.lookupClass(args[0])) == null) {
        java_class = new ClassParser(args[0]).parse();
    } // May throw IOException

    ClassGen cg = new ClassGen(java_class);
    ConstantPoolGen cp = cg.getConstantPool();
    Method[] methods = cg.getMethods();

    for (int i = 0; i < methods.length; i++) {
        try {
            System.out.println("\n\n--------------------------");
            System.out.println(methods[i].getName());
            System.out.println("--------------------------");
            MethodGen mg = new MethodGen(methods[i], cg.getClassName(), cp);
            ASMInstrumenter gi = new ASMInstrumenter(mg, cg, cp);
            int nvars = mg.getMaxLocals() + 10;

            String s = "GETSTATIC java.lang.System out \"Ljava/io/PrintStream;\"  " + "astore " + nvars + " ";
            String s2 = "aload " + nvars + " ";
            String s3 = "LDC \"Entrando no metodo " + mg.getName() + "\" ";
            String s4 = "LDC \"Saindo do metodo " + mg.getName() + "\\n \" ";
            String s5 = "invokevirtual java.io.PrintStream println " + "\"(Ljava/lang/Object;)V\" ";

            gi.insertBefore(mg.getInstructionList().getStart(), s + s2 + s3 + s5);
            gi.insertBefore(mg.getInstructionList().getEnd(), s2 + s4 + s5);
            methods[i] = mg.getMethod();
        } catch (ParseException e) {
            System.err.println("Parser error " + e.getMessage());
        }
    }
    cg.setMethods(methods);
    java_class = cg.getJavaClass();
    java_class.dump("new_" + args[0]);
}

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