View Javadoc

1   /*
2    * Copyright (C) 1998-2000 Semiotek Inc.  All Rights Reserved.
3    *
4    * Redistribution and use in source and binary forms, with or without
5    * modification, are permitted under the terms of either of the following
6    * Open Source licenses:
7    *
8    * The GNU General Public License, version 2, or any later version, as
9    * published by the Free Software Foundation
10   * (http://www.fsf.org/copyleft/gpl.html);
11   *
12   *  or
13   *
14   * The Semiotek Public License (http://webmacro.org/LICENSE.)
15   *
16   * This software is provided "as is", with NO WARRANTY, not even the
17   * implied warranties of fitness to purpose, or merchantability. You
18   * assume all risks and liabilities associated with its use.
19   *
20   * See www.webmacro.org for more information on the WebMacro project.
21   */
22  
23  package org.webmacro.directive;
24  
25  import org.webmacro.Context;
26  import org.webmacro.FastWriter;
27  import org.webmacro.PropertyException;
28  import org.webmacro.engine.BuildContext;
29  import org.webmacro.engine.BuildException;
30  import org.webmacro.engine.Variable;
31  
32  import java.io.IOException;
33  /***
34   * Implements a directive supporting a global value.
35   */
36  public class GlobalDirective extends Directive
37  {
38  
39      private static final int GLOBAL_TARGET = 1;
40  
41      private static final ArgDescriptor[]
42              myArgs = new ArgDescriptor[]{
43                  new LValueArg(GLOBAL_TARGET),
44              };
45  
46      private static final DirectiveDescriptor
47              myDescr = new DirectiveDescriptor("global", null, myArgs, null);
48  
49      public static DirectiveDescriptor getDescriptor ()
50      {
51          return myDescr;
52      }
53  
54      public Object build (DirectiveBuilder builder,
55                           BuildContext bc)
56              throws BuildException
57      {
58          Variable target = null;
59  
60          try
61          {
62              target = (Variable) builder.getArg(GLOBAL_TARGET, bc);
63          }
64          catch (ClassCastException e)
65          {
66              throw new NotVariableBuildException(myDescr.name, e);
67          }
68          if (!target.isSimpleName())
69              throw new NotSimpleVariableBuildException(myDescr.name);
70  
71          bc.setVariableType(target.getName(), Variable.LOCAL_TYPE);
72          return null;
73      }
74  
75      public void write (FastWriter out, Context context)
76              throws PropertyException, IOException
77      {
78      }
79  
80  }