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


1 /*
2  * The Apache Software License, Version 1.1
3  *
4  *
5  * Copyright (c) 1999-2002 The Apache Software Foundation. All rights
6  * reserved.
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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.
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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
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20  * 3. The end-user documentation included with the redistribution,
21  * if any, must include the following acknowledgment:
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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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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
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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 import com.sun.org.apache.xerces.internal.impl.xs.XSParticleDecl;
63
64 /**
65  *
66  * Content model Uni-Op node.
67  *
68  * @author Neil Graham, IBM
69  * @version $$
70  */
71 public class XSCMUniOp extends CMNode {
72     // -------------------------------------------------------------------
73 // Constructors
74 // -------------------------------------------------------------------
75 public XSCMUniOp(int type, CMNode childNode) {
76         super(type);
77
78         // Insure that its one of the types we require
79 if ((type() != XSParticleDecl.PARTICLE_ZERO_OR_ONE)
80         && (type() != XSParticleDecl.PARTICLE_ZERO_OR_MORE)
81         && (type() != XSParticleDecl.PARTICLE_ONE_OR_MORE)) {
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         return fChild;
95     }
96
97
98     // -------------------------------------------------------------------
99 // Package, inherited methods
100 // -------------------------------------------------------------------
101 public boolean isNullable() {
102         //
103 // For debugging purposes, make sure we got rid of all non '*'
104 // repetitions. Otherwise, '*' style nodes are always nullable.
105 //
106 if (type() == XSParticleDecl.PARTICLE_ONE_OR_MORE)
107             return fChild.isNullable();
108         else
109             return true;
110     }
111
112
113     // -------------------------------------------------------------------
114 // Protected, inherited methods
115 // -------------------------------------------------------------------
116 protected void calcFirstPos(CMStateSet toSet) {
117         // Its just based on our child node's first pos
118 toSet.setTo(fChild.firstPos());
119     }
120
121     protected void calcLastPos(CMStateSet toSet) {
122         // Its just based on our child node's last pos
123 toSet.setTo(fChild.lastPos());
124     }
125
126
127     // -------------------------------------------------------------------
128 // Private data members
129 //
130 // fChild
131 // This is the reference to the one child that we have for this
132 // unary operation.
133 // -------------------------------------------------------------------
134 private CMNode fChild;
135 } // XSCMUniOp
136
137
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