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package com.sun.xml.internal.ws.client.sei;

import javax.jws.WebParam.Mode;
import javax.xml.ws.Holder;

Gets a value from an object that represents a parameter passed
as a method argument.
 This abstraction hides the handling of Holder. 
 ValueGetter is a stateless behavior encapsulation. 
Author:
Kohsuke Kawaguchi/**
 * Gets a value from an object that represents a parameter passed
 * as a method argument.
 *
 * <p>
 * This abstraction hides the handling of {@link Holder}.
 *
 * <p>
 * {@link ValueGetter} is a stateless behavior encapsulation.
 *
 * @author Kohsuke Kawaguchi
 */
enum ValueGetter {
    
ValueGetter that works for Mode.IN parameter. 
 Since it's the IN mode, the parameter is not a Holder, therefore the parameter itself is a value. /**
     * {@link ValueGetter} that works for {@link Mode#IN}  parameter.
     *
     * <p>
     * Since it's the IN mode, the parameter is not a {@link Holder},
     * therefore the parameter itself is a value.
     */
    PLAIN() {
        Object get(Object parameter) {
            return parameter;
        }
    },
    
Creates ValueGetter that works for Holder, which is Mode.INOUT or Mode.OUT. 
 In those Modes, the parameter is a Holder, so the value to be sent is obtained by getting the value of the holder. /**
     * Creates {@link ValueGetter} that works for {@link Holder},
     * which is  {@link Mode#INOUT} or  {@link Mode#OUT}.
     *
     * <p>
     * In those {@link Mode}s, the parameter is a {@link Holder},
     * so the value to be sent is obtained by getting the value of the holder.
     */
    HOLDER() {
        Object get(Object parameter) {
            if(parameter==null)
                // the user is allowed to pass in null where a Holder is expected.
                return null;
            return ((Holder)parameter).value;
        }
    };

    
Gets the value to be sent, from a parameter given as a method argument.
Params:
parameter – that is passed by proxy
Returns:
if it holder then its value, otherise parameter itself/**
     * Gets the value to be sent, from a parameter given as a method argument.
     * @param parameter that is passed by proxy
     * @return if it holder then its value, otherise parameter itself
     */
    abstract Object get(Object parameter);

}