javax.enterprise.inject.spi.Interceptor Maven / Gradle / Ivy

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 *
 * 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.
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 */

package javax.enterprise.inject.spi;

import java.lang.annotation.Annotation;
import java.util.Set;

import javax.interceptor.InvocationContext;

/**
 * 
 * Represents an enabled {@linkplain javax.interceptor interceptor}.
 * 
 * 
 * @author Gavin King
 * @author Pete Muir
 * @author David Allen
 * 
 * @param  the interceptor bean class
 */
public interface Interceptor extends Bean {

    /**
     * 
     * Obtains the {@linkplain javax.interceptor.InterceptorBinding interceptor bindings} of the interceptor.
     * 
     * 
     * @return the set of {@linkplain javax.interceptor.InterceptorBinding interceptor bindings}
     */
    public Set getInterceptorBindings();

    /**
     * 
     * Determines if the interceptor intercepts the specified {@linkplain InterceptionType kind of lifecycle callback or method
     * invocation}.
     * 
     * 
     * @param type the {@linkplain InterceptionType kind of interception}
     * @return returns true if the interceptor intercepts callbacks or business methods of the given type, and
     *         false otherwise.
     */
    public boolean intercepts(InterceptionType type);

    /**
     * 
     * Invokes the specified {@linkplain InterceptionType kind of lifecycle callback or method invocation interception} upon the
     * given interceptor instance.
     * 
     * 
     * @param type the {@linkplain InterceptionType kind of interception}
     * @param instance the interceptor instance to invoke
     * @param ctx the context for the invocation
     * @return the invocation return value
     * @throws exceptions thrown by the target method and/or the following interceptors in the chain
     */
    public Object intercept(InterceptionType type, T instance, InvocationContext ctx) throws Exception;

}