protected void buildConstructors()

in drools-mvel/src/main/java/org/drools/mvel/asm/DefaultEnumClassBuilder.java [143:286]
121 lines of code
7 McCabe index (conditional complexity)

    protected void buildConstructors(ClassWriter cw, EnumClassDefinition classDef) {
        MethodVisitor mv;
        final StringBuilder argTypesBuilder = new StringBuilder();
        int size = 0;
        for ( FieldDefinition fld : classDef.getFieldsDefinitions() ) {
            argTypesBuilder.append(BuildUtils.getTypeDescriptor( fld.getTypeName() ));
            size += BuildUtils.sizeOf( fld.getTypeName() );
        }


        {
            int ofs = 3;

            mv = cw.visitMethod( ACC_PRIVATE,
                                 "<init>",
                                 "(Ljava/lang/String;I" + argTypesBuilder.toString() +")V",
                                 "(" + argTypesBuilder.toString() + ")V",
                                 null );
            mv.visitCode();
            mv.visitVarInsn( ALOAD, 0 );
            mv.visitVarInsn( ALOAD, 1 );
            mv.visitVarInsn( ILOAD, 2 );
            mv.visitMethodInsn( INVOKESPECIAL,
                                "java/lang/Enum",
                                "<init>",
                                "(Ljava/lang/String;I)V" );
            for ( FieldDefinition fld : classDef.getFieldsDefinitions() ) {
                mv.visitVarInsn( ALOAD, 0 );
                mv.visitVarInsn( AsmUtil.varType( fld.getTypeName() ), ofs );
                mv.visitFieldInsn( PUTFIELD,
                                   BuildUtils.getInternalType( classDef.getName() ),
                                   fld.getName(),
                                   BuildUtils.getTypeDescriptor( fld.getTypeName() ) );
                ofs += BuildUtils.sizeOf( fld.getTypeName() );
            }
            mv.visitInsn( RETURN );
            mv.visitMaxs( 3, ofs );
            mv.visitEnd();
        }


        {


            mv = cw.visitMethod( ACC_STATIC,
                                 "<clinit>",
                                 "()V",
                                 null,
                                 null);
            mv.visitCode();

            int N = classDef.getEnumLiterals().size();

            mv.visitTypeInsn( NEW,
                              BuildUtils.getInternalType( classDef.getClassName() ) );

            for ( int j = 0; j < N; j++ ) {
                EnumLiteralDefinition lit = classDef.getEnumLiterals().get( j );
                mv.visitInsn( DUP );
                mv.visitLdcInsn( lit.getName() );
                AsmUtil.pushInt( mv, j );

                List<String> args = lit.getConstructorArgs();
                for ( int k = 0; k < args.size(); k++ ) {
                    String argType = classDef.getField( k ).getTypeName();

                    mv.visitLdcInsn( args.get( k ) );
                    mv.visitMethodInsn( INVOKESTATIC,
                                        "org/mvel2/MVEL",
                                        "eval",
                                        "(Ljava/lang/String;)Ljava/lang/Object;");

                    if ( BuildUtils.isPrimitive( argType ) ) {
                        mv.visitTypeInsn( CHECKCAST,
                                          BuildUtils.getInternalType( BuildUtils.box( argType ) ) );
                        mv.visitMethodInsn( INVOKEVIRTUAL,
                                            BuildUtils.getInternalType( BuildUtils.box( argType ) ),
                                            BuildUtils.numericMorph( BuildUtils.box( argType ) ),
                                            "()" + BuildUtils.getTypeDescriptor( argType ) );
                    } else {
                        mv.visitTypeInsn( CHECKCAST,
                                          BuildUtils.getInternalType( argType ) );
                    }
                }

                mv.visitMethodInsn( INVOKESPECIAL,
                                    BuildUtils.getInternalType( classDef.getClassName() ),
                                    "<init>",
                                    "(Ljava/lang/String;I" + argTypesBuilder.toString() + ")V" );
                mv.visitFieldInsn(PUTSTATIC,
                                  BuildUtils.getInternalType(classDef.getClassName()),
                                  lit.getName(),
                                  BuildUtils.getTypeDescriptor(classDef.getClassName()));
                mv.visitTypeInsn( NEW, BuildUtils.getInternalType( classDef.getClassName() ) );
            }


            AsmUtil.pushInt( mv, N );
            mv.visitTypeInsn( ANEWARRAY, BuildUtils.getInternalType( classDef.getClassName() ));

            for ( int j = 0; j < N; j++ ) {
                EnumLiteralDefinition lit = classDef.getEnumLiterals().get( j );
                mv.visitInsn(DUP);
                AsmUtil.pushInt( mv, j );
                mv.visitFieldInsn( GETSTATIC,
                                   BuildUtils.getInternalType( classDef.getClassName() ),
                                   lit.getName(),
                                   BuildUtils.getTypeDescriptor( classDef.getClassName() ) );
                mv.visitInsn(AASTORE);
            }


            mv.visitFieldInsn( PUTSTATIC,
                               BuildUtils.getInternalType( classDef.getClassName() ),
                               "$VALUES",
                               "[" + BuildUtils.getTypeDescriptor( classDef.getClassName() ));

            mv.visitInsn( RETURN );
            mv.visitMaxs( 4 + size, 0 );
            mv.visitEnd();
        }



        {
            mv = cw.visitMethod( ACC_PUBLIC + ACC_STATIC,
                                 "valueOf",
                                 "(Ljava/lang/String;)" + BuildUtils.getTypeDescriptor( classDef.getClassName() ),
                                 null,
                                 null );
            mv.visitCode();
            mv.visitLdcInsn( Type.getType( BuildUtils.getTypeDescriptor( classDef.getClassName() ) ) );
            mv.visitVarInsn( ALOAD, 0 );
            mv.visitMethodInsn( INVOKESTATIC,
                                "java/lang/Enum",
                                "valueOf",
                                "(Ljava/lang/Class;Ljava/lang/String;)Ljava/lang/Enum;" );
            mv.visitTypeInsn( CHECKCAST,
                              BuildUtils.getInternalType( classDef.getClassName() ) );
            mv.visitInsn( ARETURN );
            mv.visitMaxs( 2, 1 );
            mv.visitEnd();
        }
    }