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Java > Open Source Codes > com > sun > org > apache > xerces > internal > impl > dtd > models > CMUniOp


1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
6  * reserved.
7  *
8  * Redistribution and use in source and binary forms, with or without
9  * modification, are permitted provided that the following conditions
10  * are met:
11  *
12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
14  *
15  * 2. Redistributions in binary form must reproduce the above copyright
16  * notice, this list of conditions and the following disclaimer in
17  * the documentation and/or other materials provided with the
18  * distribution.
19  *
20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
22  * "This product includes software developed by the
23  * Apache Software Foundation (http://www.apache.org/)."
24  * Alternately, this acknowledgment may appear in the software itself,
25  * if and wherever such third-party acknowledgments normally appear.
26  *
27  * 4. The names "Xerces" and "Apache Software Foundation" must
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29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
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33  * nor may "Apache" appear in their name, without prior written
34  * permission of the Apache Software Foundation.
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36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
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41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
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44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
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49  *
50  * This software consists of voluntary contributions made by many
51  * individuals on behalf of the Apache Software Foundation and was
52  * originally based on software copyright (c) 1999, International
53  * Business Machines, Inc., http://www.apache.org. For more
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56  */
57
58 package com.sun.org.apache.xerces.internal.impl.dtd.models;
59
60 import com.sun.org.apache.xerces.internal.impl.dtd.XMLContentSpec;
61
62 /**
63  *
64  * Content model Uni-Op node.
65  *
66  * @version $Id: CMUniOp.java,v 1.2 2002/01/29 01:15:10 lehors Exp $
67  */
68 public class CMUniOp extends CMNode
69 {
70     // -------------------------------------------------------------------
71 // Constructors
72 // -------------------------------------------------------------------
73 public CMUniOp(int type, CMNode childNode)
74     {
75         super(type);
76
77         // Insure that its one of the types we require
78 if ((type() != XMLContentSpec.CONTENTSPECNODE_ZERO_OR_ONE)
79         && (type() != XMLContentSpec.CONTENTSPECNODE_ZERO_OR_MORE)
80         && (type() != XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE))
81         {
82             throw new RuntimeException JavaDoc("ImplementationMessages.VAL_UST");
83         }
84
85         // Store the node and init any data that needs it
86 fChild = childNode;
87     }
88
89
90     // -------------------------------------------------------------------
91 // Package, final methods
92 // -------------------------------------------------------------------
93 final CMNode getChild()
94     {
95         return fChild;
96     }
97
98
99     // -------------------------------------------------------------------
100 // Package, inherited methods
101 // -------------------------------------------------------------------
102 public boolean isNullable()
103     {
104         //
105 // For debugging purposes, make sure we got rid of all non '*'
106 // repetitions. Otherwise, '*' style nodes are always nullable.
107 //
108 if (type() == XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE)
109         return fChild.isNullable();
110     else
111         return true;
112     }
113
114
115     // -------------------------------------------------------------------
116 // Protected, inherited methods
117 // -------------------------------------------------------------------
118 protected void calcFirstPos(CMStateSet toSet)
119     {
120         // Its just based on our child node's first pos
121 toSet.setTo(fChild.firstPos());
122     }
123
124     protected void calcLastPos(CMStateSet toSet)
125     {
126         // Its just based on our child node's last pos
127 toSet.setTo(fChild.lastPos());
128     }
129
130
131     // -------------------------------------------------------------------
132 // Private data members
133 //
134 // fChild
135 // This is the reference to the one child that we have for this
136 // unary operation.
137 // -------------------------------------------------------------------
138 private CMNode fChild;
139 };
140
141
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