1 /*
2 * reserved comment block
3 * DO NOT REMOVE OR ALTER!
4 */
5 /*
6 * Licensed to the Apache Software Foundation (ASF) under one or more
7 * contributor license agreements. See the NOTICE file distributed with
8 * this work for additional information regarding copyright ownership.
9 * The ASF licenses this file to You under the Apache License, Version 2.0
10 * (the "License"); you may not use this file except in compliance with
11 * the License. You may obtain a copy of the License at
12 *
13 * http://www.apache.org/licenses/LICENSE-2.0
14 *
15 * Unless required by applicable law or agreed to in writing, software
16 * distributed under the License is distributed on an "AS IS" BASIS,
17 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
18 * See the License for the specific language governing permissions and
19 * limitations under the License.
20 */
21
22 package com.sun.org.apache.xerces.internal.impl.xs.models;
23
24 import com.sun.org.apache.xerces.internal.impl.dtd.models.CMNode;
25 import com.sun.org.apache.xerces.internal.impl.dtd.models.CMStateSet;
26 import com.sun.org.apache.xerces.internal.impl.xs.XSParticleDecl;
27
28 /**
29 *
30 * Content model Uni-Op node.
31 *
32 * @xerces.internal
33 *
34 * @author Neil Graham, IBM
35 * @version $$
36 */
37 public class XSCMUniOp extends CMNode {
38 // -------------------------------------------------------------------
39 // Constructors
40 // -------------------------------------------------------------------
41 public XSCMUniOp(int type, CMNode childNode) {
42 super(type);
43
44 // Insure that its one of the types we require
45 if ((type() != XSParticleDecl.PARTICLE_ZERO_OR_ONE)
46 && (type() != XSParticleDecl.PARTICLE_ZERO_OR_MORE)
47 && (type() != XSParticleDecl.PARTICLE_ONE_OR_MORE)) {
48 throw new RuntimeException("ImplementationMessages.VAL_UST");
49 }
50
51 // Store the node and init any data that needs it
52 fChild = childNode;
53 }
54
55
56 // -------------------------------------------------------------------
57 // Package, final methods
58 // -------------------------------------------------------------------
59 final CMNode getChild() {
60 return fChild;
61 }
62
63
64 // -------------------------------------------------------------------
65 // Package, inherited methods
66 // -------------------------------------------------------------------
67 public boolean isNullable() {
68 //
69 // For debugging purposes, make sure we got rid of all non '*'
70 // repetitions. Otherwise, '*' style nodes are always nullable.
71 //
72 if (type() == XSParticleDecl.PARTICLE_ONE_OR_MORE)
73 return fChild.isNullable();
74 else
75 return true;
76 }
77
78
79 // -------------------------------------------------------------------
80 // Protected, inherited methods
81 // -------------------------------------------------------------------
82 protected void calcFirstPos(CMStateSet toSet) {
83 // Its just based on our child node's first pos
84 toSet.setTo(fChild.firstPos());
85 }
86
87 protected void calcLastPos(CMStateSet toSet) {
88 // Its just based on our child node's last pos
89 toSet.setTo(fChild.lastPos());
90 }
91
92 /**
93 * Allows the user to set arbitrary data on this content model
94 * node. This is used by the a{n,m} optimization that runs
95 * in constant space. For convenience, set user data in
96 * children node too.
97 */
98 @Override
99 public void setUserData(Object userData) {
100 super.setUserData(userData);
101 fChild.setUserData(userData);
102 }
103
104
105 // -------------------------------------------------------------------
106 // Private data members
107 //
108 // fChild
109 // This is the reference to the one child that we have for this
110 // unary operation.
111 // -------------------------------------------------------------------
112 private CMNode fChild;
113 } // XSCMUniOp