Examples of org.objectweb.asm.ClassReader

org.objectweb.asm.ClassReader
A Java class parser to make a {@link ClassVisitor ClassVisitor} visit anexisting class. This class parses a byte array conforming to the Java class file format and calls the appropriate visit methods of a given class visitor for each field, method and bytecode instruction encountered. @author Eric Bruneton


        InputStream inputStream;


        // Use ASM
        inputStream = location.getInputStream(name);
        this.classReader = new ClassReader(inputStream);
        inputStream.close();


        // Use jClassLib
        inputStream = location.getInputStream(name);
        this.classFile = ClassFileReader.readFromInputStream(inputStream);

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    String resource = "/" + name.replace('.', '/') + ".class";
if (DEBUG) System.out.println("Reading class file: " + resource);
    InputStream classStream = class_.getResourceAsStream(resource);
    try {
      ClassReader r = new ClassReader(classStream);
      r.accept(this, ClassReader.SKIP_CODE + ClassReader.SKIP_DEBUG
          + ClassReader.SKIP_FRAMES);


    } catch (IOException e) {
      // Shouldn't generally happen
      throw new TypeNotPresentException(

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  private void readClassStream(final String name, final ClassVisitor cv) {
    String resource = "/" + name.replace('.', '/') + ".class";
    InputStream classStream = class_.getResourceAsStream(resource);
    try {
      ClassReader r = new ClassReader(classStream);
      r.accept(cv, ClassReader.SKIP_CODE + ClassReader.SKIP_DEBUG
          + ClassReader.SKIP_FRAMES);


      Class parent = class_.getSuperclass();
      if (parent != null) {
        AIB parentAib = getAib(parent);

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  private static final boolean COMPACT_CONSTANTS = true;


  protected boolean weave(InputStream sourceStream, String fileName, ByteArrayOutputStream bos)
      throws IOException {


        ClassReader cr = new ClassReader(sourceStream);
        ClassWriter cw = new ClassWriter(true);


        try {
          NameTranslatorClassVisitor translator;
          ConstantPool cp;
            if (COMPACT_CONSTANTS) {
                cp = new ConstantPool();
                ClassConstantsCollector ccc = new ClassConstantsCollector(cw, cp);
                translator = new NameTranslatorClassVisitor(ccc);
            } else {
              translator = new NameTranslatorClassVisitor(cw);
            }
            ClassWeaver classWeaver = new ClassWeaver(translator, lazy, target, listener);
            SignatureStripper sigStripper = new SignatureStripper(classWeaver);
            cr.accept(sigStripper, false);        


            if (COMPACT_CONSTANTS) {
              Set<Constant> constants = new TreeSet<Constant>(new ConstantComparator());
              constants.addAll(cp.values());


              cr = new ClassReader(cw.toByteArray());
                cw = new ClassWriter(false);
                for(Constant c: constants)
                  c.write(cw);
                cr.accept(cw, false);
            }


          bos.write(cw.toByteArray());
          return true;
        } catch (LazyException e) {

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  private void verifyClass(InputStream sourceStream, String classFileName)
      throws IOException {


    failedClasses = new HashSet<String>();


        ClassReader cr = new ClassReader(sourceStream);
        cr.accept(this, false);
  }

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    if (warningCount != 0)
      listener.displaySummary(warningCount);
  }


  private ClassReader getClassReader(String className) throws ClassNotFoundException {
      ClassReader reader = null;
    SoftReference<ClassReader> ref = classReaderCache.get(className);
    if (ref != null)
      reader = ref.get();


    if (reader == null) {
      byte b[] = classLoader.getClassData(className);


      reader = new ClassReader(b);


      classReaderCache.put(className, new SoftReference<ClassReader>(reader));
    }
    return reader;    
  }

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    }


  private boolean findField(String owner, final String name, final String c) throws ClassNotFoundException {
    String javaClassName = owner;
    while (true) {
      ClassReader reader = getClassReader(javaClassName);
      FindFieldOrMethodClassVisitor visitor = new FindFieldOrMethodClassVisitor(false, name, c);
    
      try {
        reader.accept(visitor, false);
      } catch (Success s) {
        return true;
      }
      String[] is = visitor.classInterfaces;
      for (String i : is)

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  }


  private boolean findMethod(final String owner, final String name, final String desc) throws ClassNotFoundException {
    String javaClassName = owner;
    while (true) {
      ClassReader reader = getClassReader(javaClassName);
      FindFieldOrMethodClassVisitor visitor = new FindFieldOrMethodClassVisitor(true, name, desc);
      try {
        reader.accept(visitor, false);
      } catch (Success s) {
        return true;
      }


      if (visitor.isInterface || visitor.isAbstract) {

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  };


  protected boolean weave(InputStream sourceStream, String fileName, ByteArrayOutputStream bos)
      throws IOException {


        ClassReader cr = new ClassReader(sourceStream);
        ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS);


        try {
          // chain class visitors
          ClassVisitor classVisitor = cw;
          ConstantPool cp;
            if (COMPACT_CONSTANTS) {
                cp = new ConstantPool();
                classVisitor = new ClassConstantsCollector(classVisitor, cp);
            }
            classVisitor = new NameTranslatorClassVisitor(classVisitor, NameTranslator.getGeneralTranslator());
          classVisitor = new ClassWeaver(classVisitor,
                        lazy, stripAttributes, target, listener);
          
          // StringBuilder translation will be done before general weaving and
          // mirror translation: trimToSize() calls will be processed correctly
          // and no need to do translations in general weaving process
            classVisitor = new NameTranslatorClassVisitor(classVisitor, NameTranslator.getStringBuilderTranslator());


          if (stripSignatures) {
            classVisitor = new SignatureStripper(classVisitor);
          }


          classVisitor = new AnnotationWeaver(classVisitor);


          cr.accept(classVisitor, CUSTOM_ATTRIBUTES, ClassReader.EXPAND_FRAMES);        


            if (COMPACT_CONSTANTS) {
              Set<Constant> constants = new TreeSet<Constant>(new ConstantComparator());
              constants.addAll(cp.values());


              cr = new ClassReader(cw.toByteArray());
                cw = new ClassWriter(0);
                for(Constant c: constants) {
                  c.write(cw);
                }
                cr.accept(cw, 0);
            }


          bos.write(cw.toByteArray());
          return true;
        } catch (TranslatorException te) {

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  private void verifyClass(InputStream sourceStream)
      throws IOException {


    failedClasses = new HashSet<String>();


        ClassReader cr = new ClassReader(sourceStream);
        cr.accept(this, 0);
  }

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