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 }