Examples of javassist.bytecode.MethodInfo.addAttribute()

javassist.bytecode.MethodInfo.addAttribute()
Appends an attribute. If there is already an attribute with the same name, the new one substitutes for it. @see #getAttributes()

      SignatureAttribute ai = (SignatureAttribute) field.getFieldInfo2().getAttribute(SignatureAttribute.tag);
      if (ai != null)
      {
         MethodInfo wrapperInfo = wmethod.getMethodInfo2();
         SignatureAttribute methodAtt = new SignatureAttribute(wrapperInfo.getConstPool(), "(" + ai.getSignature() + ")V");
         wrapperInfo.addAttribute(methodAtt);
      }
      
      return wmethod;
   }

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                    if (m.getName().equals("<init>")) {
                        try {
                            Constructor<?> meth = i.getConstructor(oldClass);
                            AnnotationDataStore.recordConstructorAnnotations(meth, (AnnotationsAttribute) m.getAttribute(AnnotationsAttribute.visibleTag));
                            // now revert the annotations:
                            m.addAttribute(AnnotationReplacer.duplicateAnnotationsAttribute(file.getConstPool(), meth));
                            m.addAttribute(AnnotationReplacer.duplicateParameterAnnotationsAttribute(file.getConstPool(), meth));
                        } catch (Exception e) {
                            throw new RuntimeException(e);
                        }
                    } else if (!m.getName().equals("<clinit>")) {

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                        try {
                            Constructor<?> meth = i.getConstructor(oldClass);
                            AnnotationDataStore.recordConstructorAnnotations(meth, (AnnotationsAttribute) m.getAttribute(AnnotationsAttribute.visibleTag));
                            // now revert the annotations:
                            m.addAttribute(AnnotationReplacer.duplicateAnnotationsAttribute(file.getConstPool(), meth));
                            m.addAttribute(AnnotationReplacer.duplicateParameterAnnotationsAttribute(file.getConstPool(), meth));
                        } catch (Exception e) {
                            throw new RuntimeException(e);
                        }
                    } else if (!m.getName().equals("<clinit>")) {
                        // other methods

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                        try {
                            Method meth = i.getMethod(oldClass);
                            AnnotationDataStore.recordMethodAnnotations(meth, (AnnotationsAttribute) m.getAttribute(AnnotationsAttribute.visibleTag));
                            AnnotationDataStore.recordMethodParameterAnnotations(meth, (ParameterAnnotationsAttribute) m.getAttribute(ParameterAnnotationsAttribute.visibleTag));
                            // now revert the annotations:
                            m.addAttribute(AnnotationReplacer.duplicateAnnotationsAttribute(file.getConstPool(), meth));
                            m.addAttribute(AnnotationReplacer.duplicateParameterAnnotationsAttribute(file.getConstPool(), meth));
                        } catch (Exception e) {
                            throw new RuntimeException(e);
                        }
                    }

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                            Method meth = i.getMethod(oldClass);
                            AnnotationDataStore.recordMethodAnnotations(meth, (AnnotationsAttribute) m.getAttribute(AnnotationsAttribute.visibleTag));
                            AnnotationDataStore.recordMethodParameterAnnotations(meth, (ParameterAnnotationsAttribute) m.getAttribute(ParameterAnnotationsAttribute.visibleTag));
                            // now revert the annotations:
                            m.addAttribute(AnnotationReplacer.duplicateAnnotationsAttribute(file.getConstPool(), meth));
                            m.addAttribute(AnnotationReplacer.duplicateParameterAnnotationsAttribute(file.getConstPool(), meth));
                        } catch (Exception e) {
                            throw new RuntimeException(e);
                        }
                    }

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            try {
                meth = md.getConstructor(oldClass);
            } catch (Exception e) {
                throw new RuntimeException("Error accessing existing constructor via reflection in not found", e);
            }
            m.addAttribute(AnnotationReplacer.duplicateAnnotationsAttribute(file.getConstPool(), meth));
        } else {
            Method meth;
            try {
                meth = md.getMethod(oldClass);
            } catch (Exception e) {

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            try {
                meth = md.getMethod(oldClass);
            } catch (Exception e) {
                throw new RuntimeException("Error accessing existing method via reflection in not found", e);
            }
            m.addAttribute(AnnotationReplacer.duplicateAnnotationsAttribute(file.getConstPool(), meth));
        }
        Bytecode b = new Bytecode(file.getConstPool(), 5, 3);
        b.addNew("java.lang.NoSuchMethodError");
        b.add(Opcode.DUP);
        b.addInvokespecial("java.lang.NoSuchMethodError", "<init>", "()V");

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                // ClassDataStore.addFinalMethod(file.getName(), m.getName(),
                // m.getDescriptor());
                AnnotationsAttribute at = (AnnotationsAttribute) m.getAttribute(AnnotationsAttribute.visibleTag);
                if (at == null) {
                    at = new AnnotationsAttribute(file.getConstPool(), AnnotationsAttribute.visibleTag);
                    m.addAttribute(at);
                }
                at.addAnnotation(new Annotation(ModifiedMethod.class.getName(), file.getConstPool()));
                m.addAttribute(new AttributeInfo(file.getConstPool(), Constants.FINAL_METHOD_ATTRIBUTE, new byte[0]));
                modified = true;
            }

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                if (at == null) {
                    at = new AnnotationsAttribute(file.getConstPool(), AnnotationsAttribute.visibleTag);
                    m.addAttribute(at);
                }
                at.addAnnotation(new Annotation(ModifiedMethod.class.getName(), file.getConstPool()));
                m.addAttribute(new AttributeInfo(file.getConstPool(), Constants.FINAL_METHOD_ATTRIBUTE, new byte[0]));
                modified = true;
            }
        }
        return modified;
    }

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        b.add(Opcode.RETURN);
        method.setAccessFlags(AccessFlag.PUBLIC);
        method.setCodeAttribute(b.toCodeAttribute());
        method.getCodeAttribute().setMaxLocals(paramCount + 1);
        AttributeInfo an = annotations.copy(proxy.getConstPool(), Collections.EMPTY_MAP);
        method.addAttribute(an);


        try {
            proxy.addMethod(method);
            method.getCodeAttribute().computeMaxStack();
            ByteArrayOutputStream bytes = new ByteArrayOutputStream();

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