org.apache.xmlbeans.impl.jam.JAnnotation Maven / Gradle / Ivy
/* Copyright 2004 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.xmlbeans.impl.jam;
/**
* Represents a metadata that is associated with a particular
* JElement. Note that JAnnoations are JElements, which means
* that they themselves can have annotations, and can be treated as
* nodes in a JAM hierarchy.
*
* Annotations can be simple or complex. Values of simple
* annotations can be retrieved via the various get...Value() methods.
* Complex attributes can be navigated via the getAnnotations() method
* which exposes nested attributes (which may in turn be either simple
* or complex.
*
* @author Patrick Calahan <email: pcal-at-bea-dot-com>
*/
public interface JAnnotation extends JElement {
// ========================================================================
// Constants
public String getSimpleName();
public static final String SINGLE_VALUE_NAME = "value";
// ========================================================================
// Public methods
/**
* If a typed annotation proxy has been registered for the annotation
* represented by this JAnnotation, returns this object. Note that
* it's usually easier to access proxies by simply calling
* JAnnotatedElement.getAnnotationProxy(proxyClass).
*
* The value returned is guaranteed to be either a user-defined
* subclass of TypedAnnotationProxyBase or null.
*/
public Object getProxy();
/**
* Returns an array of this annotation's member values.
*/
public JAnnotationValue[] getValues();
/**
* Returns a structure which provides untyped, "by-name" access to
* the value of the named annotation member.
*/
public JAnnotationValue getValue(String named);
// we're going to expose these with getArtifact() instead.
/**
*
Use of this method is *strongly* discouraged.
*
* If this JAnnotation represents a javadoc tag, returns the raw,
* untrimmed contents of the tag. Otherwise, returns null. You
* shouldn't use this method without a really good reason - you normally
* should call one of the getMember() methods to get at the tag contents.
* You can call getMember(SINGLE_MEMBER_NAME) to get a JAnnotationValue
* representing the contents of a simple javadoc tag (e.g. @mytag myvalue).
*
*/
//public String getJavadocTagText();
/**
* If this JAnnotation corresponds to metadata that is stored in
* a JSR175 annotation (i.e. an instance of java.lang.annotation.Annotation),
* returns that annotation object. Returns null if the annotation does
* not exist or is otherwise unavailable.
*
* Note that this is done only on a best-effort basis - the annotation
* object not be availble under pre-1.5 JREs and will generally only be
* available if the underlying annotation was view from a class file. Note
* that the retention policy of the annotation type usually must also be
* RUNTIME. Unless you are sure of all of these things, you are better
* off using an AnnotationProxy or the untyped value accessors
* (e.g. getValues()).
*
* If this method does return something other than null, it is guaranteed
* to be an instance of java.lang.annotation.Annotation. It
* is typed here as Object simply to preserve API compatibility
* with Java 1.4.
.
*/
public Object getAnnotationInstance();
}