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com.google.gwt.i18n.rebind.AnnotationUtil Maven / Gradle / Ivy

/*
 * Copyright 2008 Google Inc.
 * 
 * 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 com.google.gwt.i18n.rebind;

import com.google.gwt.core.ext.typeinfo.JClassType;

import java.lang.annotation.Annotation;

/**
 * Utility class for i18n-related annotation manipulation routines.
 */
public class AnnotationUtil {

  /**
   * Find an instance of the specified annotation, walking up the inheritance
   * tree if necessary.  
   * 
   * 

Note that i18n annotations may appear on classes as well as interfaces * (a concrete implementation can be supplied rather than just an interface * and this is the normal way of using generic Localizable interfaces), so * we have to search the super chain as well as other interfaces. * *

The super chain is walked first, so if an ancestor superclass has the * requested annotation, it will be preferred over a directly implemented * interface. * * @param Annotation type to search for * @param clazz root class to search, may be null * @param annotationClass class object of Annotation subclass to search for * @return the requested annotation or null if none */ static T getClassAnnotation(JClassType clazz, Class annotationClass) { if (clazz == null) { return null; } T annot = clazz.getAnnotation(annotationClass); if (annot == null) { annot = getClassAnnotation(clazz.getSuperclass(), annotationClass); if (annot != null) { return annot; } for (JClassType intf : clazz.getImplementedInterfaces()) { annot = getClassAnnotation(intf, annotationClass); if (annot != null) { return annot; } } } return annot; } }





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