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Java > Open Source Codes > org > enhydra > apache > xerces > validators > common > CMUniOp


1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 1999 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
28  * not be used to endorse or promote products derived from this
29  * software without prior written permission. For written
30  * permission, please contact apache@apache.org.
31  *
32  * 5. Products derived from this software may not be called "Apache",
33  * nor may "Apache" appear in their name, without prior written
34  * permission of the Apache Software Foundation.
35  *
36  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
37  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
38  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
39  * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
40  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
41  * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
42  * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
43  * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
44  * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
45  * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
46  * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
47  * SUCH DAMAGE.
48  * ====================================================================
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
54  * information on the Apache Software Foundation, please see
55  * <http://www.apache.org/>.
56  */
57
58 package org.enhydra.apache.xerces.validators.common;
59
60 import org.enhydra.apache.xerces.framework.XMLContentSpec;
61 import org.enhydra.apache.xerces.utils.ImplementationMessages;
62
63 /**
64  *
65  * @version
66  */
67 public class CMUniOp extends CMNode
68 {
69     // -------------------------------------------------------------------
70 // Constructors
71 // -------------------------------------------------------------------
72 public CMUniOp(int type, CMNode childNode) throws CMException
73     {
74         super(type);
75
76         // Insure that its one of the types we require
77 if ((type() != XMLContentSpec.CONTENTSPECNODE_ZERO_OR_ONE)
78         && (type() != XMLContentSpec.CONTENTSPECNODE_ZERO_OR_MORE)
79         && (type() != XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE))
80         {
81             throw new CMException(ImplementationMessages.VAL_UST);
82         }
83
84         // Store the node and init any data that needs it
85 fChild = childNode;
86     }
87
88
89     // -------------------------------------------------------------------
90 // Package, final methods
91 // -------------------------------------------------------------------
92 final CMNode getChild()
93     {
94         return fChild;
95     }
96
97
98     // -------------------------------------------------------------------
99 // Package, inherited methods
100 // -------------------------------------------------------------------
101 boolean isNullable() throws CMException
102     {
103         //
104 // For debugging purposes, make sure we got rid of all non '*'
105 // repetitions. Otherwise, '*' style nodes are always nullable.
106 //
107 if (type() == XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE)
108         return fChild.isNullable();
109     else
110         return true;
111     }
112
113
114     // -------------------------------------------------------------------
115 // Protected, inherited methods
116 // -------------------------------------------------------------------
117 protected void calcFirstPos(CMStateSet toSet) throws CMException
118     {
119         // Its just based on our child node's first pos
120 toSet.setTo(fChild.firstPos());
121     }
122
123     protected void calcLastPos(CMStateSet toSet) throws CMException
124     {
125         // Its just based on our child node's last pos
126 toSet.setTo(fChild.lastPos());
127     }
128
129
130     // -------------------------------------------------------------------
131 // Private data members
132 //
133 // fChild
134 // This is the reference to the one child that we have for this
135 // unary operation.
136 // -------------------------------------------------------------------
137 private CMNode fChild;
138 };
139
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