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1 /*
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5  * Copyright (c) 1999,2000 The Apache Software Foundation. All rights
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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.QName;
62 import org.enhydra.apache.xerces.utils.StringPool;
63
64 /**
65  * Content model leaf node.
66  *
67  * @version $Id: CMLeaf.java,v 1.2 2005/01/26 08:28:44 jkjome Exp $
68  */
69 public class CMLeaf
70     extends CMNode {
71
72     //
73 // Data
74 //
75
76     /** This is the element that this leaf represents. */
77     private QName fElement = new QName();
78
79     /**
80      * Part of the algorithm to convert a regex directly to a DFA
81      * numbers each leaf sequentially. If its -1, that means its an
82      * epsilon node. Zero and greater are non-epsilon positions.
83      */
84     private int fPosition = -1;
85
86     //
87 // Constructors
88 //
89
90     /** Constructs a content model leaf. */
91     public CMLeaf(QName element, int position) throws CMException {
92         super(XMLContentSpec.CONTENTSPECNODE_LEAF);
93
94         // Store the element index and position
95 fElement.setValues(element);
96         fPosition = position;
97     }
98
99     /** Constructs a content model leaf. */
100     public CMLeaf(QName element) throws CMException {
101         super(XMLContentSpec.CONTENTSPECNODE_LEAF);
102
103         // Store the element index and position
104 fElement.setValues(element);
105     }
106
107     //
108 // Package methods
109 //
110
111     final QName getElement()
112     {
113         return fElement;
114     }
115
116     final int getPosition()
117     {
118         return fPosition;
119     }
120
121     final void setPosition(int newPosition)
122     {
123         fPosition = newPosition;
124     }
125
126     //
127 // CMNode methods
128 //
129
130     // package
131
132     boolean isNullable() throws CMException
133     {
134         // Leaf nodes are never nullable unless its an epsilon node
135 return (fPosition == -1);
136     }
137
138     String JavaDoc toString(StringPool stringPool)
139     {
140         StringBuffer JavaDoc strRet = new StringBuffer JavaDoc(fElement.toString());
141         strRet.append(" (");
142         strRet.append(stringPool.toString(fElement.uri));
143         strRet.append(',');
144         strRet.append(stringPool.toString(fElement.localpart));
145         strRet.append(')');
146         if (fPosition >= 0)
147         {
148             strRet.append
149             (
150                 " (Pos:"
151                 + new Integer JavaDoc(fPosition).toString()
152                 + ")"
153             );
154         }
155         return strRet.toString();
156     }
157
158     // protected
159
160     protected void calcFirstPos(CMStateSet toSet) throws CMException
161     {
162         // If we are an epsilon node, then the first pos is an empty set
163 if (fPosition == -1)
164             toSet.zeroBits();
165
166         // Otherwise, its just the one bit of our position
167 else
168             toSet.setBit(fPosition);
169     }
170
171     protected void calcLastPos(CMStateSet toSet) throws CMException
172     {
173         // If we are an epsilon node, then the last pos is an empty set
174 if (fPosition == -1)
175             toSet.zeroBits();
176
177         // Otherwise, its just the one bit of our position
178 else
179             toSet.setBit(fPosition);
180     }
181
182 } // class CMLeaf
183
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