| // Copyright 2007, 2008, 2010 The Apache Software Foundation |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package org.apache.tapestry5.internal.transform; |
| |
| import java.util.List; |
| import java.util.Map; |
| import java.util.TreeMap; |
| |
| import org.apache.tapestry5.annotations.ApplicationState; |
| import org.apache.tapestry5.annotations.SessionState; |
| import org.apache.tapestry5.func.Predicate; |
| import org.apache.tapestry5.internal.services.ComponentClassCache; |
| import org.apache.tapestry5.ioc.services.FieldValueConduit; |
| import org.apache.tapestry5.model.MutableComponentModel; |
| import org.apache.tapestry5.services.ApplicationStateManager; |
| import org.apache.tapestry5.services.ClassTransformation; |
| import org.apache.tapestry5.services.ComponentClassTransformWorker; |
| import org.apache.tapestry5.services.TransformField; |
| |
| /** |
| * Looks for the {@link ApplicationState} and {@link org.apache.tapestry5.annotations.SessionState} annotations and |
| * converts read and write access on such fields into calls to the {@link ApplicationStateManager}. |
| */ |
| public class ApplicationStateWorker implements ComponentClassTransformWorker |
| { |
| private final ApplicationStateManager applicationStateManager; |
| |
| private final ComponentClassCache componentClassCache; |
| |
| public ApplicationStateWorker(ApplicationStateManager applicationStateManager, |
| ComponentClassCache componentClassCache) |
| { |
| this.applicationStateManager = applicationStateManager; |
| this.componentClassCache = componentClassCache; |
| } |
| |
| public void transform(ClassTransformation transformation, MutableComponentModel model) |
| { |
| Map<TransformField, Boolean> fields = new TreeMap<TransformField, Boolean>(); |
| |
| for (TransformField field : transformation.matchFieldsWithAnnotation(ApplicationState.class)) |
| { |
| ApplicationState annotation = field.getAnnotation(ApplicationState.class); |
| |
| fields.put(field, annotation.create()); |
| |
| field.claim(annotation); |
| } |
| |
| for (TransformField field : transformation.matchFieldsWithAnnotation(SessionState.class)) |
| { |
| SessionState annotation = field.getAnnotation(SessionState.class); |
| |
| fields.put(field, annotation.create()); |
| |
| field.claim(annotation); |
| } |
| |
| for (Map.Entry<TransformField, Boolean> e : fields.entrySet()) |
| { |
| transform(transformation, e.getKey(), e.getValue()); |
| } |
| } |
| |
| @SuppressWarnings("unchecked") |
| private void transform(ClassTransformation transformation, TransformField field, final boolean create) |
| { |
| final Class fieldClass = componentClassCache.forName(field.getType()); |
| |
| field.replaceAccess(new FieldValueConduit() |
| { |
| public void set(Object newValue) |
| { |
| applicationStateManager.set(fieldClass, newValue); |
| } |
| |
| public Object get() |
| { |
| return create ? applicationStateManager.get(fieldClass) : applicationStateManager |
| .getIfExists(fieldClass); |
| } |
| }); |
| |
| final String expectedName = field.getName() + "Exists"; |
| |
| List<TransformField> fields = transformation.matchFields(new Predicate<TransformField>() |
| { |
| public boolean accept(TransformField field) |
| { |
| return field.getType().equals("boolean") && field.getName().equalsIgnoreCase(expectedName); |
| } |
| }); |
| |
| for (TransformField existsField : fields) |
| { |
| existsField.claim(this); |
| |
| String className = transformation.getClassName(); |
| |
| String fieldName = existsField.getName(); |
| |
| existsField.replaceAccess(new ReadOnlyFieldValueConduit(className, fieldName) |
| { |
| public Object get() |
| { |
| return applicationStateManager.exists(fieldClass); |
| } |
| }); |
| } |
| } |
| } |