Examples with MethodInfo javassist.bytecode.MethodInfo used on opensource projects

Example 51 with MethodInfo

use of javassist.bytecode.MethodInfo in project coprhd-controller by CoprHD.

the class DbSchemaChanger method removeAnnotation.

/**
 * remove an annotation from a method
 *
 * @param methodName the method to which the annotation to be removed
 * @param annotationName the annotation name, it should be a full name
 */
public DbSchemaChanger removeAnnotation(String methodName, String annotationName) throws Exception {
    // looking for the method to apply the annotation on
    CtMethod methodDescriptor = cc.getDeclaredMethod(methodName);
    // create the annotation
    ClassFile ccFile = cc.getClassFile();
    ccFile.setVersionToJava5();
    ConstPool constpool = ccFile.getConstPool();
    MethodInfo minfo = methodDescriptor.getMethodInfo();
    AnnotationsAttribute attr = (AnnotationsAttribute) minfo.getAttribute(AnnotationsAttribute.visibleTag);
    Annotation[] annotations = attr.getAnnotations();
    List<Annotation> list = new ArrayList();
    for (Annotation annotation : annotations) {
        if (!annotation.getTypeName().equals(annotationName)) {
            list.add(annotation);
        }
    }
    Annotation[] newAnnotations = list.toArray(new Annotation[0]);
    attr.setAnnotations(newAnnotations);
    minfo.addAttribute(attr);
    return this;
}

Example 52 with MethodInfo

use of javassist.bytecode.MethodInfo in project tutorials by eugenp.

the class JavasisstUnitTest method givenLoadedClass_whenAddConstructorToClass_shouldCreateClassWithConstructor.

@Test
public void givenLoadedClass_whenAddConstructorToClass_shouldCreateClassWithConstructor() throws NotFoundException, CannotCompileException, BadBytecode {
    // given
    ClassFile cf = ClassPool.getDefault().get("com.baeldung.javasisst.Point").getClassFile();
    Bytecode code = new Bytecode(cf.getConstPool());
    code.addAload(0);
    code.addInvokespecial("java/lang/Object", MethodInfo.nameInit, "()V");
    code.addReturn(null);
    // when
    MethodInfo minfo = new MethodInfo(cf.getConstPool(), MethodInfo.nameInit, "()V");
    minfo.setCodeAttribute(code.toCodeAttribute());
    cf.addMethod(minfo);
    // then
    CodeIterator ci = code.toCodeAttribute().iterator();
    List<String> operations = new LinkedList<>();
    while (ci.hasNext()) {
        int index = ci.next();
        int op = ci.byteAt(index);
        operations.add(Mnemonic.OPCODE[op]);
    }
    assertEquals(operations, Arrays.asList("aload_0", "invokespecial", "return"));
}

Example 53 with MethodInfo

use of javassist.bytecode.MethodInfo in project hibernate-orm by hibernate.

the class BulkAccessorFactory method addDefaultConstructor.

/**
 * Declares a constructor that takes no parameter.
 *
 * @param classfile The class descriptor
 *
 * @throws CannotCompileException Indicates trouble with the underlying Javassist calls
 */
private void addDefaultConstructor(ClassFile classfile) throws CannotCompileException {
    final ConstPool constPool = classfile.getConstPool();
    final String constructorSignature = "()V";
    final MethodInfo constructorMethodInfo = new MethodInfo(constPool, MethodInfo.nameInit, constructorSignature);
    final Bytecode code = new Bytecode(constPool, 0, 1);
    // aload_0
    code.addAload(0);
    // invokespecial
    code.addInvokespecial(BulkAccessor.class.getName(), MethodInfo.nameInit, constructorSignature);
    // return
    code.addOpcode(Opcode.RETURN);
    constructorMethodInfo.setCodeAttribute(code.toCodeAttribute());
    constructorMethodInfo.setAccessFlags(AccessFlag.PUBLIC);
    classfile.addMethod(constructorMethodInfo);
}

Example 54 with MethodInfo

use of javassist.bytecode.MethodInfo in project reflections by ronmamo.

the class MethodParameterNamesScanner method scan.

@Override
public List<Map.Entry<String, String>> scan(ClassFile classFile) {
    List<Map.Entry<String, String>> entries = new ArrayList<>();
    for (MethodInfo method : classFile.getMethods()) {
        String key = JavassistHelper.methodName(classFile, method);
        String value = getString(method);
        if (!value.isEmpty()) {
            entries.add(entry(key, value));
        }
    }
    return entries;
}