/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You 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 javax.servlet.annotation;

import java.lang.annotation.Documented;
import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

import javax.servlet.DispatcherType;

The annotation used to declare a Servlet Filter. 


 This annotation will be processed by the container during deployment, the Filter class in which it is found will be created as per the configuration and applied to the URL patterns, Servlets and DispatcherTypes.



If the name attribute is not defined, the fully qualified name of the class
is used.


 At least one URL pattern MUST be declared in either the value or urlPattern attribute of the annotation, but not both.


 The value attribute is recommended for use when the URL pattern is the only attribute being set, otherwise the urlPattern attribute should be used.


 The annotated class MUST implement Filter. E.g. @WebFilter("/path/*")

public class AnExampleFilter implements Filter { ... 

Since:
Servlet 3.0 (Section 8.1.2)/**
 * The annotation used to declare a Servlet {@link javax.servlet.Filter}. <br>
 * <br>
 *
 * This annotation will be processed by the container during deployment, the
 * Filter class in which it is found will be created as per the configuration
 * and applied to the URL patterns, {@link javax.servlet.Servlet}s and
 * {@link javax.servlet.DispatcherType}s.<br>
 * <br>
 *
 * If the name attribute is not defined, the fully qualified name of the class
 * is used.<br>
 * <br>
 *
 * At least one URL pattern MUST be declared in either the {@code value} or
 * {@code urlPattern} attribute of the annotation, but not both.<br>
 * <br>
 *
 * The {@code value} attribute is recommended for use when the URL pattern is
 * the only attribute being set, otherwise the {@code urlPattern} attribute
 * should be used.<br>
 * <br>
 *
 * The annotated class MUST implement {@link javax.servlet.Filter}.
 *
 * E.g.
 *
 * <code>@WebFilter("/path/*")</code><br>
 * <code>public class AnExampleFilter implements Filter { ... </code><br>
 *
 * @since Servlet 3.0 (Section 8.1.2)
 *
 */
@Target(ElementType.TYPE)
@Retention(RetentionPolicy.RUNTIME)
@Documented
public @interface WebFilter {

    
Returns:
description of the Filter, if present/**
     * @return description of the Filter, if present
     */
    String description() default "";

    
Returns:
display name of the Filter, if present/**
     * @return display name of the Filter, if present
     */
    String displayName() default "";

    
Returns:
array of initialization params for this Filter/**
     * @return array of initialization params for this Filter
     */
    WebInitParam[] initParams() default {};

    
Returns:
name of the Filter, if present/**
     * @return name of the Filter, if present
     */
    String filterName() default "";

    
Returns:
small icon for this Filter, if present/**
     * @return small icon for this Filter, if present
     */
    String smallIcon() default "";

    
Returns:
the large icon for this Filter, if present/**
     * @return the large icon for this Filter, if present
     */
    String largeIcon() default "";

    
Returns:
array of Servlet names to which this Filter applies/**
     * @return array of Servlet names to which this Filter applies
     */
    String[] servletNames() default {};

    
A convenience method, to allow extremely simple annotation of a class.
See Also:
urlPatterns()
Returns:
array of URL patterns/**
     * A convenience method, to allow extremely simple annotation of a class.
     *
     * @return array of URL patterns
     * @see #urlPatterns()
     */
    String[] value() default {};

    
Returns:
array of URL patterns to which this Filter applies/**
     * @return array of URL patterns to which this Filter applies
     */
    String[] urlPatterns() default {};

    
Returns:
array of DispatcherTypes to which this filter applies/**
     * @return array of DispatcherTypes to which this filter applies
     */
    DispatcherType[] dispatcherTypes() default {DispatcherType.REQUEST};

    
Returns:
asynchronous operation supported by this Filter/**
     * @return asynchronous operation supported by this Filter
     */
    boolean asyncSupported() default false;
}