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/*
 * (c) Copyright BEA Systems, Inc., Cape Clear Software, International Business Machines Corp, Interface21, IONA Technologies,
 * Oracle, Primeton Technologies, Progress Software, Red Hat, Rogue Wave Software, SAP AG., Siemens AG., Software AG., Sybase
 * Inc., TIBCO Software Inc., 2005, 2007. All rights reserved.
 * 
 * see http://www.osoa.org/display/Main/Service+Component+Architecture+Specifications
 */
package org.osoa.sca.annotations;

import static java.lang.annotation.ElementType.FIELD;
import static java.lang.annotation.ElementType.METHOD;
import static java.lang.annotation.ElementType.PARAMETER;
import static java.lang.annotation.ElementType.TYPE;
import static java.lang.annotation.RetentionPolicy.RUNTIME;
import static org.osoa.sca.Constants.SCA_PREFIX;

import java.lang.annotation.Inherited;
import java.lang.annotation.Retention;
import java.lang.annotation.Target;

/**
 * Annotation denoting the intent that service operations require authentication.
 * <p/>
 * Applied to the injection site (field, method or constructor parameter) for a reference,
 * it indicates that all invocations through that reference require authentication.
 * <p/>
 * Applied to a interface method on a service contract, it indicates that all invocations
 * of that service operation require authentication; applied to the type of a service contract,
 * it indicates that all service operations on that interface require authentication.
 * <p/>
 * Applied to a method on an implementation class, it indicates that all invocations that
 * are dispatched to that implementation method (through any service) require authentication.
 * Applied to a interface implemented by an implementation class, it indicates that all
 * invocations that are dispatched to the implementation method for that interface operation
 * require authentication.
 * <p/>
 * Applied to an implementation class, it indicates that all invocations of that implementation
 * and that all invocations made by that implementation require authentication.
 *
 * @version $Rev$ $Date$
 */
@Inherited
@Target({TYPE, FIELD, METHOD, PARAMETER})
@Retention(RUNTIME)
@Intent(Authentication.AUTHENTICATION)
public @interface Authentication {
    String AUTHENTICATION = SCA_PREFIX + "authentication";
    String AUTHENTICATION_MESSAGE = AUTHENTICATION + "message";
    String AUTHENTICATION_TRANSPORT = AUTHENTICATION + "transport";

    /**
     * List of authentication qualifiers (such as "message" or "transport").
     *
     * @return authentication qualifiers
     */
    @Qualifier
    String[] value() default "";
}