final Statement throwCaughtExceptionStatement = new ThrowStatement(caughtExceptionVariableExpression);
final Statement ifExceptionHandlerMethodExistsStatement = new IfStatement(new BooleanExpression(exceptionHandlerMethodExpression), returnStatement, throwCaughtExceptionStatement);
catchBlockCode.addStatement(new ExpressionStatement(declareExceptionHandlerMethod));
catchBlockCode.addStatement(ifExceptionHandlerMethodExistsStatement);
final CatchStatement catchStatement = new CatchStatement(new Parameter(new ClassNode(Exception.class), caughtExceptionArgumentName), catchBlockCode);
final Statement methodBody = methodNode.getCode();
BlockStatement tryBlock = new BlockStatement();
BlockStatement codeToHandleAllowedMethods = getCodeToHandleAllowedMethods(controllerClassNode, methodNode.getName());
tryBlock.addStatement(codeToHandleAllowedMethods);
tryBlock.addStatement(methodBody);
final TryCatchStatement tryCatchStatement = new TryCatchStatement(tryBlock, new EmptyStatement());
tryCatchStatement.addCatch(catchStatement);
final ArgumentListExpression argumentListExpression = new ArgumentListExpression();
argumentListExpression.addExpression(new ConstantExpression(ALLOWED_METHODS_HANDLED_ATTRIBUTE_NAME));
final PropertyExpression requestPropertyExpression = new PropertyExpression(new VariableExpression("this"), "request");
final Expression removeAttributeMethodCall = new MethodCallExpression(requestPropertyExpression, "removeAttribute", argumentListExpression);
final Expression getAttributeMethodCall = new MethodCallExpression(requestPropertyExpression, "getAttribute", new ArgumentListExpression(new ConstantExpression(ALLOWED_METHODS_HANDLED_ATTRIBUTE_NAME)));
final VariableExpression attributeValueExpression = new VariableExpression("$allowed_methods_attribute_value", ClassHelper.make(Object.class));
final Expression initializeAttributeValue = new DeclarationExpression(
attributeValueExpression, Token.newSymbol(Types.EQUALS, 0, 0), getAttributeMethodCall);
final Expression attributeValueMatchesMethodNameExpression = new BinaryExpression(new ConstantExpression(methodNode.getName()),
Token.newSymbol(Types.COMPARE_EQUAL, 0, 0),
attributeValueExpression);
final Statement ifAttributeValueMatchesMethodName =
new IfStatement(new BooleanExpression(attributeValueMatchesMethodNameExpression),
new ExpressionStatement(removeAttributeMethodCall), new EmptyStatement());
final BlockStatement blockToRemoveAttribute = new BlockStatement();
blockToRemoveAttribute.addStatement(new ExpressionStatement(initializeAttributeValue));
blockToRemoveAttribute.addStatement(ifAttributeValueMatchesMethodName);
final TryCatchStatement tryCatchToRemoveAttribute = new TryCatchStatement(blockToRemoveAttribute, new EmptyStatement());
tryCatchToRemoveAttribute.addCatch(new CatchStatement(new Parameter(ClassHelper.make(Exception.class), "$exceptionRemovingAttribute"), new EmptyStatement()));
tryCatchStatement.setFinallyStatement(tryCatchToRemoveAttribute);
methodNode.setCode(tryCatchStatement);
}