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1   /*
2    * Copyright (c) 1997, 2012, Oracle and/or its affiliates. All rights reserved.
3    * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
4    *
5    * This code is free software; you can redistribute it and/or modify it
6    * under the terms of the GNU General Public License version 2 only, as
7    * published by the Free Software Foundation.  Oracle designates this
8    * particular file as subject to the "Classpath" exception as provided
9    * by Oracle in the LICENSE file that accompanied this code.
10   *
11   * This code is distributed in the hope that it will be useful, but WITHOUT
12   * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
13   * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
14   * version 2 for more details (a copy is included in the LICENSE file that
15   * accompanied this code).
16   *
17   * You should have received a copy of the GNU General Public License version
18   * 2 along with this work; if not, write to the Free Software Foundation,
19   * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
20   *
21   * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
22   * or visit www.oracle.com if you need additional information or have any
23   * questions.
24   */
25  
26  package com.sun.xml.internal.ws.server.sei;
27  
28  import com.sun.xml.internal.ws.api.model.Parameter;
29  import com.sun.xml.internal.ws.model.ParameterImpl;
30  
31  import javax.xml.ws.Holder;
32  
33  /**
34   * Moves a Java value unmarshalled from a response message
35   * to the right place.
36   *
37   * <p>
38   * Sometimes values are returned as a return value, and
39   * others are returned in the {@link Holder} value. Instances
40   * of this interface abstracts this detail.
41   *
42   * <p>
43   * {@link EndpointValueSetter} is a stateless behavior encapsulation.
44   *
45   * @author Jitendra Kotamraju
46   */
47  public abstract class EndpointValueSetter {
48      private EndpointValueSetter() {}
49  
50      /**
51       * Moves the value to the expected place.
52       *
53       * @param obj
54       *      The unmarshalled object.
55       * @param args
56       *      The arguments that need to be given to the Java method invocation. If <tt>obj</tt>
57       *      is supposed to be returned as a {@link Holder} value, a suitable
58       *      {@link Holder} is obtained from this argument list and <tt>obj</tt>
59       *      is set.
60       *
61       */
62      abstract void put(Object obj, Object[] args);
63  
64      /**
65       * {@link Param}s with small index numbers are used often,
66       * so we pool them to reduce the footprint.
67       */
68      private static final EndpointValueSetter[] POOL = new EndpointValueSetter[16];
69  
70      static {
71          for( int i=0; i<POOL.length; i++ )
72              POOL[i] = new Param(i);
73      }
74  
75      /**
76       * Returns a {@link EndpointValueSetter} suitable for the given {@link Parameter}.
77       */
78      public static EndpointValueSetter get(ParameterImpl p) {
79          int idx = p.getIndex();
80          if (p.isIN()) {
81              if (idx<POOL.length) {
82                  return POOL[idx];
83              } else {
84                  return new Param(idx);
85              }
86          } else {
87              return new HolderParam(idx);
88          }
89      }
90  
91      static class Param extends EndpointValueSetter {
92          /**
93           * Index of the argument to put the value to.
94           */
95          protected final int idx;
96  
97          public Param(int idx) {
98              this.idx = idx;
99          }
100 
101         void put(Object obj, Object[] args) {
102             if (obj != null) {
103                 args[idx] = obj;
104             }
105         }
106     }
107 
108     static final class HolderParam extends Param {
109 
110         public HolderParam(int idx) {
111             super(idx);
112         }
113 
114         @Override
115         void put(Object obj, Object[] args) {
116             Holder holder = new Holder();
117             if (obj != null) {
118                 holder.value = obj;
119             }
120             args[idx] = holder;
121         }
122     }
123 }