Examples of org.mvel2.asm.ClassWriter

org.mvel2.asm.ClassWriter
A {@link ClassVisitor} that generates classes in bytecode form. Moreprecisely this visitor generates a byte array conforming to the Java class file format. It can be used alone, to generate a Java class "from scratch", or with one or more {@link ClassReader ClassReader} and adapter class visitorto generate a modified class from one or more existing Java classes. @author Eric Bruneton


    public byte[] buildClass( ClassDefinition classDef ) {


        init( classDef );


        ClassWriter cw = new ClassWriter( ClassWriter.COMPUTE_MAXS );




        try {
            String cName = BuildUtils.getInternalType(classDef.getClassName());
            String genericTypes = BuildUtils.getGenericTypes( classDef.getInterfaces() );
            String superType = Type.getInternalName( Object.class );
            String[] intfaces = null;
            
            if ( Object.class.getName().equals( classDef.getSuperClass() ) ) {
                String[] tmp = BuildUtils.getInternalTypes( classDef.getInterfaces() );
                intfaces = new String[ tmp.length + 1 ];
                System.arraycopy( tmp, 0, intfaces, 0, tmp.length );
                intfaces[ tmp.length ] = Type.getInternalName( Serializable.class );
            } else {
                String[] tmp = BuildUtils.getInternalTypes( classDef.getInterfaces() );
                intfaces = new String[ tmp.length + 2 ];
                System.arraycopy( tmp, 0, intfaces, 0, tmp.length );
                intfaces[ tmp.length ] = BuildUtils.getInternalType( classDef.getSuperClass() );
                intfaces[ tmp.length + 1 ] = Type.getInternalName( Serializable.class );
            }


            cw.visit( V1_5, ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE,
                    cName,
                    genericTypes,
                    superType,
                    intfaces );


            {
                if ( classDef.getDefinedClass() == null || classDef.getDefinedClass().getAnnotation( Trait.class ) == null ) {
                    AnnotationVisitor av0 = cw.visitAnnotation( Type.getDescriptor( Trait.class ), true);
                    av0.visitEnd();
                }
            }


            for ( FieldDefinition field : classDef.getFieldsDefinitions() ) {
                buildField( cw, field );
            }


            finalizeCreation( classDef );


            cw.visitEnd();
        } catch ( Exception e ) {
            e.printStackTrace();
        }


        return cw.toByteArray();
    }

View Full Code Here

        void write(ClassGenerator cg, ClassWriter cw);
    }


    public byte[] generateBytecode() {
        if (bytecode == null) {
            ClassWriter cw = new InternalClassWriter(classLoader, ClassWriter.COMPUTE_MAXS);
            cw.visit(version, access, getClassDescriptor(), signature, getSuperClassDescriptor(), toInteralNames(interfaces));
            for (int i = 0; i < classParts.size(); i++) { // don't use iterator to allow method visits to add more class fields and methods
                classParts.get(i).write(this, cw);
            }
            if (staticInitializer != null) {
                staticInitializer.write(this, cw);
            }
            cw.visitEnd();
            bytecode = cw.toByteArray();
            if (DUMP_GENERATED_CLASSES) {
                dumpGeneratedClass(bytecode);
            }
        }
        return bytecode;

View Full Code Here

        void write(ClassGenerator cg, ClassWriter cw);
    }


    public byte[] generateBytecode() {
        if (bytecode == null) {
            ClassWriter cw = new InternalClassWriter(classLoader, ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
            cw.visit(version, access, getClassDescriptor(), signature, getSuperClassDescriptor(), toInteralNames(interfaces));
            for (int i = 0; i < classParts.size(); i++) { // don't use iterator to allow method visits to add more class fields and methods
                classParts.get(i).write(this, cw);
            }
            if (staticInitializer != null) {
                staticInitializer.write(this, cw);
            }
            cw.visitEnd();
            bytecode = cw.toByteArray();
            if (DUMP_GENERATED_CLASSES) {
                dumpGeneratedClass(bytecode);
            }
        }
        return bytecode;

View Full Code Here


    public byte[] buildClass( ClassDefinition classDef ) {


        init( classDef );


        ClassWriter cw = new ClassWriter( ClassWriter.COMPUTE_MAXS );




        try {
            String cName = BuildUtils.getInternalType(classDef.getClassName());
            String genericTypes = BuildUtils.getGenericTypes( classDef.getInterfaces() );
            String superType = Type.getInternalName( Object.class );
            String[] intfaces = null;
            
            if ( Object.class.getName().equals( classDef.getSuperClass() ) ) {
                String[] tmp = BuildUtils.getInternalTypes( classDef.getInterfaces() );
                intfaces = new String[ tmp.length + 2 ];
                System.arraycopy( tmp, 0, intfaces, 0, tmp.length );
                intfaces[ tmp.length ] = Type.getInternalName( Serializable.class );
                intfaces[ tmp.length + 1 ] = Type.getInternalName( GeneratedFact.class );
            } else {
                String[] tmp = BuildUtils.getInternalTypes( classDef.getInterfaces() );
                intfaces = new String[ tmp.length + 3 ];
                System.arraycopy( tmp, 0, intfaces, 0, tmp.length );
                intfaces[ tmp.length ] = BuildUtils.getInternalType( classDef.getSuperClass() );
                intfaces[ tmp.length + 1 ] = Type.getInternalName( Serializable.class );
                intfaces[ tmp.length + 2 ] = Type.getInternalName( GeneratedFact.class );
            }


            cw.visit( V1_5, ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE,
                    cName,
                    genericTypes,
                    superType,
                    intfaces );


            {
                if ( classDef.getDefinedClass() == null || classDef.getDefinedClass().getAnnotation( Trait.class ) == null ) {
                    AnnotationVisitor av0 = cw.visitAnnotation( Type.getDescriptor( Trait.class ), true);
                    av0.visitEnd();
                }
            }


            for ( FieldDefinition field : classDef.getFieldsDefinitions() ) {
                buildField( cw, field );
            }


            finalizeCreation( classDef );


            cw.visitEnd();
        } catch ( Exception e ) {
            e.printStackTrace();
        }


        return cw.toByteArray();
    }

View Full Code Here

                              final String className,
                              final Method getterMethod,
                              final Class< ? > fieldType,
                              final boolean isInterface) throws Exception {


        final ClassWriter cw = new ClassWriter( ClassWriter.COMPUTE_MAXS );


        final Class< ? > superClass = getReaderSuperClassFor( fieldType );
        buildClassHeader( superClass,
                          className,
                          cw );


        //        buildConstructor( superClass,
        //                          className,
        //                          cw );


        build3ArgConstructor( superClass,
                              className,
                              cw );


        buildGetMethod( originalClass,
                        className,
                        superClass,
                        getterMethod,
                        cw );


        cw.visitEnd();


        return cw.toByteArray();
    }

View Full Code Here

                              final String className,
                              final Method getterMethod,
                              final Class< ? > fieldType,
                              final boolean isInterface) throws Exception {


        final ClassWriter cw = new ClassWriter( ClassWriter.COMPUTE_MAXS );


        final Class< ? > superClass = getWriterSuperClassFor( fieldType );
        buildClassHeader( superClass,
                          className,
                          cw );


        build3ArgConstructor( superClass,
                              className,
                              cw );


        buildSetMethod( originalClass,
                        className,
                        superClass,
                        getterMethod,
                        fieldType,
                        cw );


        cw.visitEnd();


        return cw.toByteArray();
    }

View Full Code Here

        void write(ClassGenerator cg, ClassWriter cw);
    }


    public byte[] generateBytecode() {
        if (bytecode == null) {
            ClassWriter cw = new InternalClassWriter(classLoader, ClassWriter.COMPUTE_MAXS);
            cw.visit(version, access, getClassDescriptor(), signature, getSuperClassDescriptor(), toInteralNames(interfaces));
            for (int i = 0; i < classParts.size(); i++) { // don't use iterator to allow method visits to add more class fields and methods
                classParts.get(i).write(this, cw);
            }
            if (staticInitializer != null) {
                staticInitializer.write(this, cw);
            }
            cw.visitEnd();
            bytecode = cw.toByteArray();
            if (DUMP_GENERATED_CLASSES) {
                dumpGeneratedClass(bytecode);
            }
        }
        return bytecode;

View Full Code Here

        void write(ClassGenerator cg, ClassWriter cw);
    }


    public byte[] generateBytecode() {
        if (bytecode == null) {
            ClassWriter cw = new ClassWriter(ClassWriter.COMPUTE_MAXS + ClassWriter.COMPUTE_FRAMES);
            cw.visit(version, access, getClassDescriptor(), signature, getSuperClassDescriptor(), toInteralNames(interfaces));
            for (ClassPartDescr part : classParts) part.write(this, cw);
            cw.visitEnd();
            bytecode = cw.toByteArray();
        }
        return bytecode;
    }

View Full Code Here


        Class coreKlazz = core.getDefinedClass();
        String coreName = coreKlazz.getName();
        String wrapperName = coreName + "Wrapper";


        ClassWriter cw = new ClassWriter(0);
        FieldVisitor fv;
        MethodVisitor mv;


        cw.visit(V1_5, ACC_PUBLIC + ACC_SUPER,
                BuildUtils.getInternalType(wrapperName),
                BuildUtils.getTypeDescriptor( coreName) +
                        "Lorg/drools/factmodel/traits/CoreWrapper<" + BuildUtils.getTypeDescriptor( coreName ) + ">;",
                BuildUtils.getInternalType( coreName ),
                new String[]{"org/drools/factmodel/traits/CoreWrapper"});


        {
            fv = cw.visitField(ACC_PRIVATE, "core", BuildUtils.getTypeDescriptor( coreName ), null, null);
            fv.visitEnd();
        }
        {
            fv = cw.visitField(ACC_PRIVATE, TraitableBean.MAP_FIELD_NAME, "Ljava/util/Map;", "Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;", null);
            fv.visitEnd();
        }
//        {
//            fv = cw.visitField(ACC_PRIVATE, TraitableBean.TRAITSET_FIELD_NAME, "Ljava/util/Map;", "Ljava/util/Map<Ljava/lang/String;Ljava/lang/Class;>;", null);
//            fv.visitEnd();
//        }


        {
            fv = cw.visitField(ACC_PRIVATE, TraitableBean.TRAITSET_FIELD_NAME, "Ljava/util/Map;", "Ljava/util/Map<Ljava/lang/String;Lorg/drools/factmodel/traits/Thing;>;", null);
            fv.visitEnd();
        }


        {
            mv = cw.visitMethod(ACC_PUBLIC, "<init>", "()V", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKESPECIAL, BuildUtils.getInternalType( coreName ), "<init>", "()V");
            mv.visitVarInsn(ALOAD, 0);
            mv.visitTypeInsn(NEW, "java/util/HashMap");
            mv.visitInsn(DUP);
            mv.visitMethodInsn(INVOKESPECIAL, "java/util/HashMap", "<init>", "()V");
            mv.visitFieldInsn( PUTFIELD,
                    BuildUtils.getInternalType( wrapperName ),
                    TraitableBean.MAP_FIELD_NAME,
                    "Ljava/util/Map;");
            mv.visitVarInsn(ALOAD, 0);
            mv.visitTypeInsn(NEW, "java/util/HashMap");
            mv.visitInsn(DUP);
            mv.visitMethodInsn(INVOKESPECIAL, "java/util/HashMap", "<init>", "()V");
            mv.visitFieldInsn( PUTFIELD,
                    BuildUtils.getInternalType( wrapperName ),
                    TraitableBean.TRAITSET_FIELD_NAME,
                    "Ljava/util/Map;");
            mv.visitInsn(RETURN);
            mv.visitMaxs(3, 1);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC, "getDynamicProperties", "()Ljava/util/Map;", "()Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;", null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn( GETFIELD,
                    BuildUtils.getInternalType( wrapperName ),
                    TraitableBean.MAP_FIELD_NAME,
                    "Ljava/util/Map;");
            mv.visitInsn(ARETURN);
            mv.visitMaxs(1, 1);
            mv.visitEnd();


            mv = cw.visitMethod( ACC_PUBLIC,
                    "setDynamicProperties",
                    "(Ljava/util/Map;)V",
                    "(Ljava/util/Map<Ljava/lang/String;Ljava/lang/Object;>;)V",
                    null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitFieldInsn(PUTFIELD, BuildUtils.getInternalType( wrapperName ), TraitableBean.MAP_FIELD_NAME, "Ljava/util/Map;");
            mv.visitInsn(RETURN);
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }
//        {
//            mv = cw.visitMethod(ACC_PUBLIC, "getTraits", "()Ljava/util/Map;", null, null);
//            mv.visitCode();
//            mv.visitVarInsn(ALOAD, 0);
//            mv.visitFieldInsn( GETFIELD,
//                    BuildUtils.getInternalType( wrapperName ),
//                    TraitableBean.TRAITSET_FIELD_NAME,
//                    "Ljava/util/Map;");
//            mv.visitInsn(ARETURN);
//            mv.visitMaxs(1, 1);
//            mv.visitEnd();
//        }


        {
            mv = cw.visitMethod(ACC_PROTECTED, "getTraitMap", "()Ljava/util/Map;", "()Ljava/util/Map<Ljava/lang/String;Lorg/drools/factmodel/traits/Thing;>;", null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, BuildUtils.getInternalType( wrapperName ), TraitableBean.TRAITSET_FIELD_NAME, "Ljava/util/Map;");
            Label l0 = new Label();
            mv.visitJumpInsn(IFNONNULL, l0);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitTypeInsn(NEW, "java/util/HashMap");
            mv.visitInsn(DUP);
            mv.visitMethodInsn(INVOKESPECIAL, "java/util/HashMap", "<init>", "()V");
            mv.visitFieldInsn(PUTFIELD, BuildUtils.getInternalType( wrapperName ), TraitableBean.TRAITSET_FIELD_NAME, "Ljava/util/Map;");
            mv.visitLabel(l0);
            mv.visitVarInsn(ALOAD, 0);
            mv.visitFieldInsn(GETFIELD, BuildUtils.getInternalType( wrapperName ), TraitableBean.TRAITSET_FIELD_NAME, "Ljava/util/Map;");
            mv.visitInsn(ARETURN);
            mv.visitMaxs(3, 1);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC, "setTraitMap", "(Ljava/util/Map;)V", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitFieldInsn(PUTFIELD, BuildUtils.getInternalType( wrapperName ), TraitableBean.TRAITSET_FIELD_NAME, "Ljava/util/Map;");
            mv.visitInsn(RETURN);
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC, "addTrait", "(Ljava/lang/String;Lorg/drools/factmodel/traits/Thing;)V", "(Ljava/lang/String;Lorg/drools/factmodel/traits/Thing;)V", null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKEVIRTUAL, BuildUtils.getInternalType( wrapperName ), "getTraitMap", "()Ljava/util/Map;");
            mv.visitVarInsn(ALOAD, 1);
            mv.visitVarInsn(ALOAD, 2);
            mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "put", "(Ljava/lang/Object;Ljava/lang/Object;)Ljava/lang/Object;");
            mv.visitInsn(POP);
            mv.visitInsn(RETURN);
            mv.visitMaxs(3, 3);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC, "getTrait", "(Ljava/lang/String;)Lorg/drools/factmodel/traits/Thing;", "(Ljava/lang/String;)Lorg/drools/factmodel/traits/Thing;", null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKEVIRTUAL, BuildUtils.getInternalType( wrapperName ), "getTraitMap", "()Ljava/util/Map;");
            mv.visitVarInsn(ALOAD, 1);
            mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "get", "(Ljava/lang/Object;)Ljava/lang/Object;");
            mv.visitTypeInsn(CHECKCAST, "org/drools/factmodel/traits/Thing");
            mv.visitInsn(ARETURN);
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC, "hasTrait", "(Ljava/lang/String;)Z", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKEVIRTUAL, BuildUtils.getInternalType( wrapperName ), "getTraitMap", "()Ljava/util/Map;");
            mv.visitVarInsn(ALOAD, 1);
            mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "containsKey", "(Ljava/lang/Object;)Z");
            mv.visitInsn(IRETURN);
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC, "removeTrait", "(Ljava/lang/String;)Lorg/drools/factmodel/traits/Thing;", "(Ljava/lang/String;)Lorg/drools/factmodel/traits/Thing;", null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKEVIRTUAL, BuildUtils.getInternalType( wrapperName ), "getTraitMap", "()Ljava/util/Map;");
            mv.visitVarInsn(ALOAD, 1);
            mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "remove", "(Ljava/lang/Object;)Ljava/lang/Object;");
            mv.visitTypeInsn(CHECKCAST, "org/drools/factmodel/traits/Thing");
            mv.visitInsn(ARETURN);
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }
        {
            mv = cw.visitMethod(ACC_PUBLIC, "getTraits", "()Ljava/util/Collection;", "()Ljava/util/Collection<Ljava/lang/String;>;", null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitMethodInsn(INVOKEVIRTUAL, BuildUtils.getInternalType( wrapperName ), "getTraitMap", "()Ljava/util/Map;");
            mv.visitMethodInsn(INVOKEINTERFACE, "java/util/Map", "keySet", "()Ljava/util/Set;");
            mv.visitInsn(ARETURN);
            mv.visitMaxs(1, 1);
            mv.visitEnd();
        }


        {
            mv = cw.visitMethod(ACC_PUBLIC, "init", "("+ BuildUtils.getTypeDescriptor( coreName ) +")V", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitFieldInsn( PUTFIELD,
                    BuildUtils.getInternalType( wrapperName ),
                    "core",
                    BuildUtils.getTypeDescriptor( coreName ) );
            mv.visitInsn(RETURN);
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }




        Method[] ms = coreKlazz.getMethods();
        for ( Method method : ms ) {
            if ( Modifier.isFinal(method.getModifiers()) ) {
                continue;
            }


            String signature = TraitFactory.buildSignature(method);
            {
                mv = cw.visitMethod( ACC_PUBLIC,
                        method.getName(),
                        signature,
                        null,
                        null );
                mv.visitCode();
                mv.visitVarInsn( ALOAD, 0 );
                mv.visitFieldInsn( GETFIELD, BuildUtils.getInternalType( wrapperName ), "core", BuildUtils.getTypeDescriptor( coreName ) );
                int j = 1;
                for ( Class arg : method.getParameterTypes() ) {
                    mv.visitVarInsn( BuildUtils.varType( arg.getName() ), j++ );
                }
                mv.visitMethodInsn( INVOKEVIRTUAL,
                        BuildUtils.getInternalType( coreName ),
                        method.getName(),
                        signature );


                mv.visitInsn( BuildUtils.returnType( method.getReturnType().getName() ) );
                int stack = TraitFactory.getStackSize(method);
                mv.visitMaxs(stack, stack);
                mv.visitEnd();
            }


        }


        {
            mv = cw.visitMethod(ACC_PUBLIC + ACC_BRIDGE + ACC_SYNTHETIC, "init", "(Ljava/lang/Object;)V", null, null);
            mv.visitCode();
            mv.visitVarInsn(ALOAD, 0);
            mv.visitVarInsn(ALOAD, 1);
            mv.visitTypeInsn(CHECKCAST, BuildUtils.getInternalType( coreName ) );
            mv.visitMethodInsn( INVOKEVIRTUAL,
                    BuildUtils.getInternalType( wrapperName ),
                    "init",
                    "(" + BuildUtils.getTypeDescriptor( coreName ) + ")V");
            mv.visitInsn(RETURN);
            mv.visitMaxs(2, 2);
            mv.visitEnd();
        }
        cw.visitEnd();


        return cw.toByteArray();
    }

View Full Code Here

public class TraitClassBuilderImpl implements TraitClassBuilder {




    public byte[] buildClass( ClassDefinition classDef ) {


        ClassWriter cw = new ClassWriter(0);
        MethodVisitor mv;




        try {
            String cName = BuildUtils.getInternalType(classDef.getClassName());
            String genericTypes = BuildUtils.getGenericTypes( classDef.getInterfaces() );
            String superType = BuildUtils.getInternalType( "java.lang.Object" );
            String[] intfaces = null;
            if ( Object.class.getName().equals( classDef.getSuperClass() ) ) {
                intfaces = BuildUtils.getInternalTypes( classDef.getInterfaces() );
            } else {
                String[] tmp = BuildUtils.getInternalTypes( classDef.getInterfaces() ); 
                intfaces = new String[ tmp.length + 1 ];
                System.arraycopy( tmp, 0, intfaces, 0, tmp.length );
                intfaces[ intfaces.length - 1 ] = BuildUtils.getInternalType( classDef.getSuperClass() );
            }


            cw.visit(V1_5, ACC_PUBLIC + ACC_ABSTRACT + ACC_INTERFACE,
                    cName,
                    genericTypes,
                    superType,
                    intfaces );


            for ( FieldDefinition field : classDef.getFieldsDefinitions() ) {
                String name = field.getName();
                name = name.substring(0,1).toUpperCase() + name.substring(1);
                String target = BuildUtils.getTypeDescriptor(field.getTypeName());


                String prefix = BuildUtils.isBoolean( field.getTypeName() ) ? "is" : "get";


                mv = cw.visitMethod(ACC_PUBLIC + ACC_ABSTRACT, prefix + name, "()" + target, null, null);
                mv.visitEnd();


                mv = cw.visitMethod(ACC_PUBLIC + ACC_ABSTRACT, "set" + name, "(" + target + ")V", null, null);
                mv.visitEnd();
            }


            cw.visitEnd();
        } catch (Exception e) {
            e.printStackTrace();
        }


        return cw.toByteArray();
    }

View Full Code Here

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