View Javadoc
1   /*
2    * Copyright (c) 1997, 2011, 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.tools.internal.xjc.model;
27  
28  import com.sun.codemodel.internal.JExpression;
29  import com.sun.tools.internal.xjc.outline.Outline;
30  import com.sun.xml.internal.xsom.XmlString;
31  
32  /**
33   * Object that computes the default value expression lazily.
34   *
35   * The computation is done lazily because often the default value
36   * needs to refer to things (such as enum classes) that are only generated
37   * after some of the outline is built.
38   *
39   * @author Kohsuke Kawaguchi
40   */
41  public abstract class CDefaultValue {
42      public abstract JExpression compute(Outline outline);
43  
44      /**
45       * Creates a new {@link CDefaultValue} that computes the default value
46       * by applying a lexical representation to a {@link TypeUse}.
47       */
48      public static CDefaultValue create(final TypeUse typeUse, final XmlString defaultValue) {
49          return new CDefaultValue() {
50              public JExpression compute(Outline outline) {
51                  return typeUse.createConstant(outline,defaultValue);
52              }
53          };
54      }
55  }