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Java > Open Source Codes > com > sun > org > apache > xerces > internal > impl > xs > models > XSCMLeaf


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:
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12  * 1. Redistributions of source code must retain the above copyright
13  * notice, this list of conditions and the following disclaimer.
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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.
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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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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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55  * <http://www.apache.org/>.
56  */
57
58 package com.sun.org.apache.xerces.internal.impl.xs.models;
59
60 import com.sun.org.apache.xerces.internal.impl.dtd.models.CMNode;
61 import com.sun.org.apache.xerces.internal.impl.dtd.models.CMStateSet;
62
63 /**
64  * Content model leaf node.
65  *
66  * @author Neil Graham, IBM
67  * @version $$
68  */
69 public class XSCMLeaf
70     extends CMNode {
71
72     //
73 // Data
74 //
75
76     /** This is the leaf: element decl or wildcard decl. */
77     private Object JavaDoc fLeaf = null;
78     
79     /**
80      * Identify the particle: for UPA checking
81      */
82     private int fParticleId = -1;
83
84     /**
85      * Part of the algorithm to convert a regex directly to a DFA
86      * numbers each leaf sequentially. If its -1, that means its an
87      * epsilon node. Zero and greater are non-epsilon positions.
88      */
89     private int fPosition = -1;
90
91     //
92 // Constructors
93 //
94
95     /** Constructs a content model leaf. */
96     public XSCMLeaf(int type, Object JavaDoc leaf, int id, int position) {
97         super(type);
98
99         // Store the element index and position
100 fLeaf = leaf;
101         fParticleId = id;
102         fPosition = position;
103     }
104
105     //
106 // Package methods
107 //
108
109     final Object JavaDoc getLeaf() {
110         return fLeaf;
111     }
112     
113     final int getParticleId() {
114         return fParticleId;
115     }
116
117     final int getPosition() {
118         return fPosition;
119     }
120
121     final void setPosition(int newPosition) {
122         fPosition = newPosition;
123     }
124
125     //
126 // CMNode methods
127 //
128
129     // package
130
131     public boolean isNullable() {
132         // Leaf nodes are never nullable unless its an epsilon node
133 return (fPosition == -1);
134     }
135
136     public String JavaDoc toString() {
137         StringBuffer JavaDoc strRet = new StringBuffer JavaDoc(fLeaf.toString());
138         if (fPosition >= 0) {
139             strRet.append
140             (
141                 " (Pos:"
142                 + new Integer JavaDoc(fPosition).toString()
143                 + ")"
144             );
145         }
146         return strRet.toString();
147     }
148
149     // protected
150
151     protected void calcFirstPos(CMStateSet toSet) {
152         // If we are an epsilon node, then the first pos is an empty set
153 if (fPosition == -1)
154             toSet.zeroBits();
155
156         // Otherwise, its just the one bit of our position
157 else
158             toSet.setBit(fPosition);
159     }
160
161     protected void calcLastPos(CMStateSet toSet) {
162         // If we are an epsilon node, then the last 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 } // class XSCMLeaf
172
173
174
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