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

        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;

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


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


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


        build3ArgConstructor( superClass,
                              className,
                              cw );


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


        cw.visitEnd();


        return cw.toByteArray();
    }

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                              final Class< ? > fieldType,
                              final boolean isInterface) throws Exception {




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


        build3ArgConstructor( superClass,
                              className,
                              cw );


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


        cw.visitEnd();


        return cw.toByteArray();
    }

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     * @param className The extractor class name
     * @param cw
     */
    protected ClassWriter buildClassHeader(Class< ? > superClass, String className) {


        ClassWriter cw = createClassWriter( superClass.getClassLoader(),
                                            Opcodes.ACC_PUBLIC + Opcodes.ACC_SUPER,
                                            className,
                                            null,
                                            Type.getInternalName( superClass ),
                                            null );


        cw.visitSource( null,
                        null );


        return cw;
    }

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 {
                intfaces = BuildUtils.getInternalTypes( classDef.getInterfaces() );
                intfaces = Arrays.copyOf(intfaces, intfaces.length + 1);
                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();
    }

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                                                      IllegalAccessException,
                                                      InvocationTargetException,
                                                      InstantiationException,
                                                      NoSuchFieldException {


        ClassWriter cw = new ClassWriter( ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS );


        this.buildClassHeader( cw,
                               classDef );


        // Building fields
        for ( FieldDefinition fieldDef : classDef.getFieldsDefinitions() ) {
            this.buildField( cw,
                             fieldDef );
        }


        // Building default constructor
        this.buildDefaultConstructor( cw,
                                      classDef );


        // Building methods
        for ( FieldDefinition fieldDef : classDef.getFieldsDefinitions() ) {
            this.buildGetMethod( cw,
                                 classDef,
                                 fieldDef );
            this.buildSetMethod( cw,
                                 classDef,
                                 fieldDef );
        }


        this.buildEquals( cw,
                          classDef );
        this.buildHashCode( cw,
                            classDef );


        this.buildToString( cw,
                            classDef );


        cw.visitEnd();


        return cw.toByteArray();
    }

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


        final ClassWriter cw = new ClassWriter( ClassWriter.COMPUTE_FRAMES | 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_FRAMES | 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();
    }

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            IllegalAccessException,
            InvocationTargetException,
            InstantiationException,
            NoSuchFieldException {


        ClassWriter cw = new ClassWriter( ClassWriter.COMPUTE_FRAMES | ClassWriter.COMPUTE_MAXS );
        //ClassVisitor cw = new CheckClassAdapter(cwr);


        this.buildClassHeader( cw,
                classDef );


        // Building fields
        for ( FieldDefinition fieldDef : classDef.getFieldsDefinitions() ) {
            if (! fieldDef.isInherited())
                this.buildField( cw,
                        fieldDef );
        }


        // Building default constructor
        this.buildDefaultConstructor( cw,
                classDef );


        // Building constructor with all fields
        if (classDef.getFieldsDefinitions().size() > 0) {
            this.buildConstructorWithFields( cw,
                    classDef,
                    classDef.getFieldsDefinitions() );
        }


        // Building constructor with key fields only
        List<FieldDefinition> keys = new LinkedList<FieldDefinition>();
        for ( FieldDefinition fieldDef : classDef.getFieldsDefinitions() ) {
            if ( fieldDef.isKey() ) {
                keys.add( fieldDef );
            }
        }
        if ( !keys.isEmpty() && keys.size() != classDef.getFieldsDefinitions().size() ) {
            this.buildConstructorWithFields( cw,
                    classDef,
                    keys );
        }


        // Building methods
        for ( FieldDefinition fieldDef : classDef.getFieldsDefinitions() ) {
            if (! fieldDef.isInherited()) {
                this.buildGetMethod( cw,
                        classDef,
                        fieldDef );
                this.buildSetMethod( cw,
                        classDef,
                        fieldDef );
            }
        }


        this.buildEquals( cw,
                classDef );
        this.buildHashCode( cw,
                classDef );


        this.buildToString( cw,
                classDef );


        cw.visitEnd();


        byte[] serializedClass = cw.toByteArray();


        return serializedClass;
    }

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

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