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 * Copyright (c) 2005, 2010, Oracle and/or its affiliates. All rights reserved.
 * ORACLE PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
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package javax.xml.ws;

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;

/**
 * The <code>Action</code> annotation allows explicit association of a
 * WS-Addressing <code>Action</code> message addressing property with
 * <code>input</code>, <code>output</code>, and
 * <code>fault</code> messages of the mapped WSDL operation.
 * <p>
 * This annotation can be specified on each method of a service endpoint interface.
 * For such a method, the mapped operation in the generated WSDL's
 * <code>wsam:Action</code> attribute on the WSDL <code>input</code>,
 * <code>output</code> and <code>fault</code> messages of the WSDL <code>operation</code>
 * is based upon which attributes of the <code>Action</code> annotation have been specified.
 * For the exact computation of <code>wsam:Action</code> values for the messages, refer
 * to the algorithm in the JAX-WS specification.
 * <p>
 * <b>Example 1</b>: Specify explicit values for <code>Action</code> message addressing property
 * for <code>input</code> and <code>output</code> messages.
 *
 * <pre>
 * @WebService(targetNamespace="http://example.com/numbers")
 * public class AddNumbersImpl {
 *     <b>@Action(
 *         input="http://example.com/inputAction",
 *         output="http://example.com/outputAction")</b>
 *     public int addNumbers(int number1, int number2) {
 *         return number1 + number2;
 *     }
 * }
 * </pre>
 *
 * The generated WSDL looks like:
 * <pre>
 *   <definitions targetNamespace="http://example.com/numbers" ...>
 *     ...
 *     <portType name="AddNumbersPortType">
 *       <operation name="AddNumbers">
 *         <input message="tns:AddNumbersInput" name="foo"
 *           <b>wsam:Action="http://example.com/inputAction"</b>/>
 *         <output message="tns:AddNumbersOutput" name="bar"
 *           <b>wsam:Action="http://example.com/outputAction"</b>/>
 *       </operation>
 *     </portType>
 *     ...
 *   </definitions>
 * </pre>
 *
 * <p>
 * <b>Example 2</b>: Specify explicit value for <code>Action</code> message addressing property
 * for only the <code>input</code> message. The <code>wsam:Action</code> values for the
 * WSDL <code>output</code> message are computed using the algorithm in the JAX-WS specification.
 *
 * <pre>
 * @WebService(targetNamespace="http://example.com/numbers")
 * public class AddNumbersImpl {
 *     <b>@Action(input="http://example.com/inputAction")</b>
 *     public int addNumbers(int number1, int number2) {
 *         return number1 + number2;
 *     }
 * }
 * </pre>
 *
 * The generated WSDL looks like:
 * <pre>
 *   <definitions targetNamespace="http://example.com/numbers" ...>
 *     ...
 *     <portType name="AddNumbersPortType">
 *       <operation name="AddNumbers">
 *         <input message="tns:AddNumbersInput" name="foo"
 *           <b>wsam:Action="http://example.com/inputAction"</b> />
 *         <output message="tns:AddNumbersOutput" name="bar"
 *           <b>wsam:Action="http://example.com/numbers/AddNumbersPortType/AddNumbersResponse"</b>/>
 *       </operation>
 *     </portType>
 *     ...
 *   </definitions>
 * </pre>
 *
 * It is legitimate to specify an explicit value for <code>Action</code> message addressing property for
 * <code>output</code> message only. In this case, <code>wsam:Action</code> value for the
 * WSDL <code>input</code> message is computed using the algorithm in the JAX-WS specification.
 *
 * <p>
 * <b>Example 3</b>: See {@link FaultAction} annotation for an example of
 * how to specify an explicit value for <code>Action</code> message addressing property for the
 * <code>fault</code> message.
 *
 * @see FaultAction
 *
 * @since JAX-WS 2.1
 */

@Documented
@Retention(RetentionPolicy.RUNTIME)
@Target(ElementType.METHOD)
public @interface Action {
    /**
     * Explicit value of the WS-Addressing <code>Action</code> message addressing property for the <code>input</code>
     * message of the operation.
     */
    String input() default "";

    /**
     * Explicit value of the WS-Addressing <code>Action</code> message addressing property for the <code>output</code>
     * message of the operation.
     */
    String output() default "";

    /**
     * Explicit value of the WS-Addressing <code>Action</code> message addressing property for the <code>fault</code>
     * message(s) of the operation. Each exception that is mapped to a fault and requires an explicit WS-Addressing
     * <code>Action</code> message addressing property, needs to be specified as a value in this property
     * using {@link FaultAction} annotation.
     */
    FaultAction[] fault() default { };
}