| /* |
| * Copyright 2002-2006,2009 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 com.opensymphony.xwork2.util; |
| |
| import java.lang.annotation.Annotation; |
| import java.lang.reflect.AnnotatedElement; |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Method; |
| import java.util.Arrays; |
| import java.util.Collection; |
| import java.util.HashSet; |
| import java.util.List; |
| import java.util.regex.Matcher; |
| import java.util.regex.Pattern; |
| |
| /** |
| * <code>AnnotationUtils</code> |
| * |
| * Various utility methods dealing with annotations |
| * |
| * @author Rainer Hermanns |
| * @author Zsolt Szasz, zsolt at lorecraft dot com |
| * @author Dan Oxlade, dan d0t oxlade at gmail d0t c0m |
| * @version $Id$ |
| */ |
| public class AnnotationUtils { |
| |
| private static final Pattern SETTER_PATTERN = Pattern.compile("set([A-Z][A-Za-z0-9]*)$"); |
| private static final Pattern GETTER_PATTERN = Pattern.compile("(get|is|has)([A-Z][A-Za-z0-9]*)$"); |
| |
| |
| |
| /** |
| * Adds all fields with the specified Annotation of class clazz and its superclasses to allFields |
| * |
| * @param annotationClass |
| * @param clazz |
| * @param allFields |
| */ |
| public static void addAllFields(Class<? extends Annotation> annotationClass, Class clazz, List<Field> allFields) { |
| |
| if (clazz == null) { |
| return; |
| } |
| |
| Field[] fields = clazz.getDeclaredFields(); |
| |
| for (Field field : fields) { |
| Annotation ann = field.getAnnotation(annotationClass); |
| if (ann!=null) { |
| allFields.add(field); |
| } |
| } |
| addAllFields(annotationClass, clazz.getSuperclass(), allFields); |
| } |
| |
| /** |
| * Adds all methods with the specified Annotation of class clazz and its superclasses to allFields |
| * |
| * @param annotationClass |
| * @param clazz |
| * @param allMethods |
| */ |
| public static void addAllMethods(Class<? extends Annotation> annotationClass, Class clazz, List<Method> allMethods) { |
| |
| if (clazz == null) { |
| return; |
| } |
| |
| Method[] methods = clazz.getDeclaredMethods(); |
| |
| for (Method method : methods) { |
| Annotation ann = method.getAnnotation(annotationClass); |
| if (ann!=null) { |
| allMethods.add(method); |
| } |
| } |
| addAllMethods(annotationClass, clazz.getSuperclass(), allMethods); |
| } |
| |
| /** |
| * |
| * @param clazz |
| * @param allInterfaces |
| */ |
| public static void addAllInterfaces(Class clazz, List<Class> allInterfaces) { |
| if (clazz == null) { |
| return; |
| } |
| |
| Class[] interfaces = clazz.getInterfaces(); |
| allInterfaces.addAll(Arrays.asList(interfaces)); |
| addAllInterfaces(clazz.getSuperclass(), allInterfaces); |
| } |
| |
| /** |
| * For the given <code>Class</code> get a collection of the the {@link AnnotatedElement}s |
| * that match the given <code>annotation</code>s or if no <code>annotation</code>s are |
| * specified then return all of the annotated elements of the given <code>Class</code>. |
| * Includes only the method level annotations. |
| * |
| * @param clazz The {@link Class} to inspect |
| * @param annotation the {@link Annotation}s to find |
| * @return A {@link Collection}<{@link AnnotatedElement}> containing all of the |
| * method {@link AnnotatedElement}s matching the specified {@link Annotation}s |
| */ |
| public static Collection<Method> getAnnotatedMethods(Class clazz, Class<? extends Annotation>... annotation){ |
| Collection<Method> toReturn = new HashSet<Method>(); |
| |
| for(Method m : clazz.getMethods()){ |
| if( ArrayUtils.isNotEmpty(annotation) && isAnnotatedBy(m, annotation) ){ |
| toReturn.add(m); |
| }else if( ArrayUtils.isEmpty(annotation) && ArrayUtils.isNotEmpty(m.getAnnotations())){ |
| toReturn.add(m); |
| } |
| } |
| |
| return toReturn; |
| } |
| |
| /** |
| * Varargs version of <code>AnnotatedElement.isAnnotationPresent()</code> |
| * @see AnnotatedElement |
| */ |
| public static boolean isAnnotatedBy(AnnotatedElement annotatedElement, Class<? extends Annotation>... annotation) { |
| if(ArrayUtils.isEmpty(annotation)) return false; |
| |
| for( Class<? extends Annotation> c : annotation ){ |
| if( annotatedElement.isAnnotationPresent(c) ) return true; |
| } |
| |
| return false; |
| } |
| |
| /** |
| * Returns the property name for a method. |
| * This method is independent from property fields. |
| * |
| * @param method The method to get the property name for. |
| * @return the property name for given method; null if non could be resolved. |
| */ |
| public static String resolvePropertyName(Method method) { |
| |
| Matcher matcher = SETTER_PATTERN.matcher(method.getName()); |
| if (matcher.matches() && method.getParameterTypes().length == 1) { |
| String raw = matcher.group(1); |
| return raw.substring(0, 1).toLowerCase() + raw.substring(1); |
| } |
| |
| matcher = GETTER_PATTERN.matcher(method.getName()); |
| if (matcher.matches() && method.getParameterTypes().length == 0) { |
| String raw = matcher.group(2); |
| return raw.substring(0, 1).toLowerCase() + raw.substring(1); |
| } |
| |
| return null; |
| } |
| |
| /** |
| * Returns the annotation on the given class or the package of the class. This searchs up the |
| * class hierarchy and the package hierarchy for the closest match. |
| * |
| * @param klass The class to search for the annotation. |
| * @param annotationClass The Class of the annotation. |
| * @return The annotation or null. |
| */ |
| public static <T extends Annotation> T findAnnotation(Class<?> klass, Class<T> annotationClass) { |
| T ann = klass.getAnnotation(annotationClass); |
| while (ann == null && klass != null) { |
| ann = klass.getAnnotation(annotationClass); |
| if (ann == null) |
| ann = klass.getPackage().getAnnotation(annotationClass); |
| if (ann == null) { |
| klass = klass.getSuperclass(); |
| if (klass != null ) { |
| ann = klass.getAnnotation(annotationClass); |
| } |
| } |
| } |
| |
| return ann; |
| } |
| } |