/* * Copyright 2002-2005 the original author or authors. * * 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. */ using System; namespace Spring.Util { /// <summary> /// General utility methods for working with annotations /// </summary> public class AttributeUtils { /// <summary> /// Find a single Attribute of the type 'attributeType' from the supplied class, /// traversing it interfaces and super classes if no attribute can be found on the /// class iteslf. /// </summary> /// <remarks> /// This method explicitly handles class-level attributes which are not declared as /// inherited as well as attributes on interfaces. /// </remarks> /// <param name="type">The class to look for attributes on .</param> /// <param name="attributeType">Type of the attribibute to look for.</param> /// <returns>the attribute of the given type found, or <code>null</code></returns> public static Attribute FindAttribute(Type type, Type attributeType) { Attribute[] attributes = Attribute.GetCustomAttributes(type, attributeType, false); // we will traverse hierarchy ourselves. if (attributes.Length > 0) { return attributes[0]; } foreach (Type interfaceType in type.GetInterfaces()) { Attribute attrib = FindAttribute(interfaceType, attributeType); if (attrib != null) { return attrib; } } if (type.BaseType == null) { return null; } return FindAttribute(type.BaseType, attributeType); } } }