Examples of org.apache.tapestry5.ioc.util.BodyBuilder

org.apache.tapestry5.ioc.util.BodyBuilder
Utility class for assembling the body used with Javassist when defining a method or constructor. Basically, assists with formatting and with indentation. This makes the code that assembles a method body much simpler ... and it makes the result neater, which will be easier to debug (debugging dynamically generated code is hard enough that it should be easy to read the input code before worrying about why it doesn't compile or execute properly).
This class is not threadsafe.
Most of the methods return the BodyBuilder, to form a fluent interface. @deprecated In 5.3/0, to be removed in a later release


        private MethodAccess createMethodAccessForTarget(String accessTarget, boolean passInstance)
        {
            boolean isVoid = sig.getReturnType().equals("void");


            BodyBuilder builder = new BodyBuilder().begin();


            builder.addln("%s instance = (%<s) $1;", getClassName());


            builder.addln("try").begin();


            if (!isVoid)
            {
                builder.add("return success(($w) ");
            }


            // Call the target, even if the eventual method is void


            builder.add(accessTarget);
            builder.add("(");


            if (passInstance)
                builder.add("instance");


            int p = 0;


            for (String type : sig.getParameterTypes())
            {
                if (passInstance || p != 0)
                    builder.add(", ");


                String ref = String.format("$2[%d]", p++);
                builder.add(ClassFabUtils.castReference(ref, type));
            }


            // Balance the call to success()
            if (!isVoid)
                builder.add(")");


            builder.addln(");");


            if (isVoid)
                builder.addln("return success(null);");


            builder.end(); // try
            builder.addln("catch (java.lang.RuntimeException ex) { throw ex; }");
            builder.addln("catch (java.lang.Exception ex) { return fail(ex); }");


            builder.end();


            return instantiateMethodAccessFromBody(builder.toString());
        }

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                    + Modifier.STATIC, sig.getReturnType(), methodName, parameterTypes.toArray(new String[0]),
                    sig.getExceptionTypes());


            boolean isVoid = sig.getReturnType().equals("void");


            BodyBuilder builder = new BodyBuilder();


            builder.begin();


            if (!isVoid)
                builder.add("return ");


            builder.add("$1.%s(", sig.getMethodName());


            for (int i = 0; i < sig.getParameterTypes().length; i++)
            {
                if (i > 0)
                    builder.add(", ");


                builder.add("$%d", i + 2);
            }


            builder.addln(");");


            builder.end();


            addNewMethod(accessMethodSignature, builder.toString());


            return methodName;
        }

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            }
        }


        private void addFieldAccessReadMethod(ClassFab cf, TransformMethod readAccess)
        {
            BodyBuilder builder = new BodyBuilder().begin();


            builder.addln("%s instance = (%<s) $1;", getClassName());
            builder.addln("return ($w) instance.%s();", readAccess.getName());


            builder.end();


            cf.addMethod(Modifier.PUBLIC, FIELD_ACCESS_READ_SIGNATURE, builder.toString());
        }

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            cf.addMethod(Modifier.PUBLIC, FIELD_ACCESS_READ_SIGNATURE, builder.toString());
        }


        private void addFieldAccessWriteMethod(ClassFab cf, TransformMethod writeAccess)
        {
            BodyBuilder builder = new BodyBuilder().begin();


            builder.addln("%s instance = (%<s) $1;", getClassName());
            builder.addln("%s value = %s;", type, ClassFabUtils.castReference("$2", type));
            builder.addln("instance.%s(value);", writeAccess.getName());


            builder.end();


            cf.addMethod(Modifier.PUBLIC, FIELD_ACCESS_WRITE_SIGNATURE, builder.toString());
        }

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            values.add(conduitPropertyName);
            values.add(annotationProvider);
            values.add(interner.format("PropertyConduit[%s %s]", rootType.getName(), expression));
            values.add(typeCoercer);


            BodyBuilder builder = new BodyBuilder().begin();


            builder.addln("super($1,$2,$3,$4,$5);");


            int index = 6;


            for (ConstructorParameter p : parameters)
            {
                types.add(p.getType());
                values.add(p.getValue());


                builder.addln("%s = $%d;", p.getFieldName(), index++);
            }


            builder.end();


            Class[] arrayOfTypes = types.toArray(new Class[0]);


            classFab.addConstructor(arrayOfTypes, null, builder.toString());


            return values.toArray();
        }

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            return type != DEREF && type != SAFEDEREF;
        }


        private void createGetRoot()
        {
            BodyBuilder builder = new BodyBuilder().begin();


            builder.addln("%s root = (%<s) $1;", ClassFabUtils.toJavaClassName(rootType));


            builder
                    .addln(
                            "if (root == null) throw new NullPointerException(\"Root object of property expression '%s' is null.\");",
                            expression);


            builder.addln("return root;");


            builder.end();


            MethodSignature sig = new MethodSignature(rootType, "getRoot", new Class[]
            { Object.class }, null);


            classFab.addMethod(Modifier.PRIVATE, sig, builder.toString());
        }

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            }
        }


        private void createRangeOpGetter(Tree node, String rootName)
        {
            BodyBuilder builder = new BodyBuilder().begin();


            addRootVariable(builder);


            builder.addln("return %s;", createMethodInvocation(builder, node, rootName, 0, RANGE));


            builder.end();


            classFab.addMethod(Modifier.PUBLIC, GET_SIGNATURE, builder.toString());
        }

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            classFab.addMethod(Modifier.PUBLIC, GET_SIGNATURE, builder.toString());
        }


        private void createNotOpGetter(Tree node, String rootName)
        {
            BodyBuilder builder = new BodyBuilder().begin();


            addRootVariable(builder);


            builder.addln("return ($w) %s;", createMethodInvocation(builder, node, rootName, 0, INVERT));


            builder.end();


            classFab.addMethod(Modifier.PUBLIC, GET_SIGNATURE, builder.toString());
        }

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            classFab.addMethod(Modifier.PUBLIC, GET_SIGNATURE, builder.toString());
        }


        public void createListGetter(Tree node, String rootName)
        {
            BodyBuilder builder = new BodyBuilder().begin();


            addRootVariable(builder);


            builder.addln("return %s;", createListConstructor(builder, node, rootName));


            builder.end();


            classFab.addMethod(Modifier.PUBLIC, GET_SIGNATURE, builder.toString());
        }

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            {
                createNoOpSetter();
                return;
            }


            BodyBuilder builder = new BodyBuilder().begin();


            addRootVariable(builder);


            builder.addln("%s target = navigate(root);", ClassFabUtils.toJavaClassName(navigateMethod.getReturnType()));


            // I.e. due to ?. operator. The navigate method will already have
            // checked for nulls
            // if they are not allowed.


            builder.addln("if (target == null) return;");


            String propertyTypeName = ClassFabUtils.toJavaClassName(info.getType());


            String reference = ClassFabUtils.castReference("$2", propertyTypeName);


            if (info.isField())
            {
                builder.add("target.%s = %s;", info.getPropertyName(), reference);
            }
            else
            {
                builder.addln("target.%s(%s);", method.getName(), reference);
            }


            builder.end();


            classFab.addMethod(Modifier.PUBLIC, SET_SIGNATURE, builder.toString());
        }

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