Examples of org.drools.util.asm.ClassFieldInspector

org.drools.util.asm.ClassFieldInspector
Visit a POJO user class, and extract the property getter methods that are public, in the order in which they are declared actually in the class itself (not using introspection). This may be enhanced in the future to allow annotations or perhaps external meta data configure the order of the indexes, as this may provide fine tuning options in special cases. @author Michael Neale

     * @param fieldName
     */
    public BaseClassFieldWriter(final Class< ? > clazz,
                                final String fieldName) {
        try {
            final ClassFieldInspector inspector = new ClassFieldInspector( clazz );
            this.index = ((Integer) inspector.getFieldNames().get( fieldName )).intValue();
            this.fieldType = (Class< ? >) inspector.getFieldTypes().get( fieldName );
            this.valueType = ValueType.determineValueType( this.fieldType );
        } catch ( final Exception e ) {
            throw new RuntimeDroolsException( e );
        }
    }

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     * @param fieldName
     */
    public BaseClassFieldReader(final Class< ? > clazz,
                                final String fieldName) {
        try {
            final ClassFieldInspector inspector = new ClassFieldInspector( clazz );
            this.index = ((Integer) inspector.getFieldNames().get( fieldName )).intValue();
            this.fieldType = (Class< ? >) inspector.getFieldTypes().get( fieldName );
            this.valueType = ValueType.determineValueType( this.fieldType );
        } catch ( final Exception e ) {
            throw new RuntimeDroolsException( e );
        }
    }

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                                 final String shortTypeName) throws IOException {
        if (clazz == null) {
            return;
        }


        final ClassFieldInspector inspector = new ClassFieldInspector(clazz);
        Set<String> fieldSet = new HashSet<String>();
        fieldSet.addAll(inspector.getFieldNames().keySet());
        // add the "this" field. This won't come out from the inspector
        fieldSet.add("this");


        String [] fields = fieldSet.toArray(new String []{});
        Arrays.sort(fields);


        fields = removeIrrelevantFields(fields);


        this.builder.addFieldsForType(shortTypeName, fields);
        
        Method[] methods = clazz.getMethods();
        List<String> modifierStrings = new ArrayList<String>();
        for (Method method : methods) {
            modifierStrings.add(method.getName());
        }
        String[] modifiers = new String[modifierStrings.size()];
        modifierStrings.toArray(modifiers);


        this.builder.addModifiersForType(shortTypeName, modifiers);


        // remove this back out because there is no type for it. We add it explicity
        fieldSet.remove("this");
        this.builder.addFieldType(shortTypeName + ".this", SuggestionCompletionEngine.TYPE_OBJECT);


        for (String field : fieldSet) {
            final Class type = inspector.getFieldTypes().get(field);
            final String fieldType = getFieldType(type);
            this.builder.addFieldType(shortTypeName + "." + field, fieldType);
        }
        
        ClassMethodInspector methodInspector = new ClassMethodInspector(clazz);

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     * @param fieldName
     */
    public BaseClassFieldReader(final Class clazz,
                                   final String fieldName) {
        try {
            final ClassFieldInspector inspector = new ClassFieldInspector( clazz );
            this.index = ((Integer) inspector.getFieldNames().get( fieldName )).intValue();
            this.fieldType = (Class) inspector.getFieldTypes().get( fieldName );
            this.valueType = ValueType.determineValueType( this.fieldType );
        } catch ( final Exception e ) {
            throw new RuntimeDroolsException( e );
        }
    }

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                                 final String shortTypeName) throws IOException {
        if (clazz == null) {
            return;
        }


        final ClassFieldInspector inspector = new ClassFieldInspector(clazz);
        Set<String> fieldSet = new HashSet<String>();
        fieldSet.addAll(inspector.getFieldNames().keySet());
        // add the "this" field. This won't come out from the inspector
        fieldSet.add("this");


        String [] fields = fieldSet.toArray(new String []{});
        Arrays.sort(fields);


        fields = removeIrrelevantFields(fields);


        this.builder.addFieldsForType(shortTypeName, fields);


        Method[] methods = clazz.getMethods();
        List<String> modifierStrings = new ArrayList<String>();
        for (Method method : methods) {
            modifierStrings.add(method.getName());
        }
        String[] modifiers = new String[modifierStrings.size()];
        modifierStrings.toArray(modifiers);


        this.builder.addModifiersForType(shortTypeName, modifiers);


        // remove this back out because there is no type for it. We add it explicity
        fieldSet.remove("this");
        this.builder.addFieldType(shortTypeName + ".this", SuggestionCompletionEngine.TYPE_OBJECT);


        for (String field : fieldSet) {
            final Class type = inspector.getFieldTypes().get(field);
            final String fieldType = getFieldType(type);
            this.builder.addFieldType(shortTypeName + "." + field, fieldType);
        }


    }

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                                 final String shortTypeName) throws IOException {
        if (clazz == null) {
            return;
        }


        final ClassFieldInspector inspector = new ClassFieldInspector(clazz);
        Set<String> fieldSet = new HashSet<String>();
        fieldSet.addAll(inspector.getFieldNames().keySet());
        // add the "this" field. This won't come out from the inspector
        fieldSet.add("this");


        String [] fields = fieldSet.toArray(new String []{});
        Arrays.sort(fields);


        fields = removeIrrelevantFields(fields);


        this.builder.addFieldsForType(shortTypeName, fields);
        
        Method[] methods = clazz.getMethods();
        List<String> modifierStrings = new ArrayList<String>();
        for (Method method : methods) {
            modifierStrings.add(method.getName());
        }
        String[] modifiers = new String[modifierStrings.size()];
        modifierStrings.toArray(modifiers);


        this.builder.addModifiersForType(shortTypeName, modifiers);


        // remove this back out because there is no type for it. We add it explicity
        fieldSet.remove("this");
        this.builder.addFieldType(shortTypeName + ".this", SuggestionCompletionEngine.TYPE_OBJECT);


        for (String field : fieldSet) {
            final Class type = inspector.getFieldTypes().get(field);
            final String fieldType = getFieldType(type);
            this.builder.addFieldType(shortTypeName + "." + field, fieldType);
            Field f = inspector.getFieldTypesField().get(field);
            this.builder.addFieldTypeField(shortTypeName + "." + field,f);
        }
        
        ClassMethodInspector methodInspector = new ClassMethodInspector(clazz);

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                                 final String shortTypeName) throws IOException {
        if (clazz == null) {
            return;
        }


        final ClassFieldInspector inspector = new ClassFieldInspector(clazz);
        Set<String> fieldSet = new HashSet<String>();
        fieldSet.addAll(inspector.getFieldNames().keySet());
        // add the "this" field. This won't come out from the inspector
        fieldSet.add("this");


        String [] fields = fieldSet.toArray(new String []{});
        Arrays.sort(fields);


        fields = removeIrrelevantFields(fields);


        this.builder.addFieldsForType(shortTypeName, fields);


        Method[] methods = clazz.getMethods();
        List<String> modifierStrings = new ArrayList<String>();
        for (Method method : methods) {
            modifierStrings.add(method.getName());
        }
        String[] modifiers = new String[modifierStrings.size()];
        modifierStrings.toArray(modifiers);


        this.builder.addModifiersForType(shortTypeName, modifiers);


        // remove this back out because there is no type for it. We add it explicity
        fieldSet.remove("this");
        this.builder.addFieldType(shortTypeName + ".this", SuggestionCompletionEngine.TYPE_OBJECT);


        for (String field : fieldSet) {
            final Class type = inspector.getFieldTypes().get(field);
            final String fieldType = getFieldType(type);
            this.builder.addFieldType(shortTypeName + "." + field, fieldType);
        }


    }

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                return new MVELClassFieldExtractor( clazz,
                                                    fieldName,
                                                    classLoader );
            } else {
                // otherwise, bytecode generate a specific extractor
                ClassFieldInspector inspector = (ClassFieldInspector) inspectors.get( clazz );
                if ( inspector == null ) {
                    inspector = new ClassFieldInspector( clazz );
                    inspectors.put( clazz,
                                    inspector );
                }
                final Class fieldType = (Class) inspector.getFieldTypes().get( fieldName );
                final Method getterMethod = (Method) inspector.getGetterMethods().get( fieldName );
                if( fieldType != null && getterMethod != null ) {
                    final String className = ClassFieldExtractorFactory.BASE_PACKAGE + "/" + Type.getInternalName( clazz ) + "$" + getterMethod.getName();


                    // generating byte array to create target class
                    final byte[] bytes = dump( clazz,
                                               className,
                                               getterMethod,
                                               fieldType,
                                               clazz.isInterface() );
                    // use bytes to get a class 


                    final Class newClass = byteArrayClassLoader.defineClass( className.replace( '/',
                                                                                                '.' ),
                                                                             bytes,
                                                                             PROTECTION_DOMAIN );
                    // instantiating target class
                    final Integer index = (Integer) inspector.getFieldNames().get( fieldName );
                    final ValueType valueType = ValueType.determineValueType( fieldType );
                    final Object[] params = {index, fieldType, valueType};
                    return (BaseClassFieldExtractor) newClass.getConstructors()[0].newInstance( params );
                } else {
                    throw new RuntimeDroolsException("Field/method '"+fieldName+"' not found for class '"+clazz.getName()+"'" );

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    private void loadClassFields(final Class clazz,
                                 final String shortTypeName) throws IOException {
        if ( clazz == null ) {
            return;
        }
        final ClassFieldInspector inspector = new ClassFieldInspector( clazz );
        String[] fields = (String[]) inspector.getFieldNames().keySet().toArray( new String[inspector.getFieldNames().size()] );
        Arrays.sort(fields);


        fields = removeIrrelevantFields( fields );


        this.builder.addFieldsForType( shortTypeName,
                                       fields );


        Method[] methods = clazz.getMethods();
        List modifierStrings = new ArrayList();
        for (int i = 0; i < methods.length; i++) {
            Method method = methods[i];
            modifierStrings.add((String) method.getName());
        }
        String[] modifiers = new String[modifierStrings.size()];
        modifierStrings.toArray(modifiers);


        this.builder.addModifiersForType( shortTypeName,
                                       modifiers);


        for ( int i = 0; i < fields.length; i++ ) {
            final Class type = (Class) inspector.getFieldTypes().get( fields[i] );
            final String fieldType = getFieldType( type );
            this.builder.addFieldType( shortTypeName + "." + fields[i],
                                       fieldType );
        }
    }

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org.drools.asm.ClassReader

org.drools.base.BaseClassFieldExtractor

org.drools.base.BaseClassFieldReader

org.drools.base.BaseClassFieldWriter

org.drools.base.ClassFieldAccessorFactory

org.drools.base.ClassFieldExtractorFactory

org.drools.brms.server.rules.SuggestionCompletionLoader

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java.lang.reflect.Field

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