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.dtd.models;
  23 
  24 import com.sun.org.apache.xerces.internal.impl.dtd.XMLContentSpec;
  25 
  26 /**
  27  * Content model Uni-Op node.
  28  *
  29  * @xerces.internal
  30  *
  31  */
  32 public class CMUniOp extends CMNode
  33 {
  34     // -------------------------------------------------------------------
  35     //  Constructors
  36     // -------------------------------------------------------------------
  37     public CMUniOp(int type, CMNode childNode)
  38     {
  39         super(type);
  40 
  41         // Insure that its one of the types we require
  42         if ((type() != XMLContentSpec.CONTENTSPECNODE_ZERO_OR_ONE)
  43         &&  (type() != XMLContentSpec.CONTENTSPECNODE_ZERO_OR_MORE)
  44         &&  (type() != XMLContentSpec.CONTENTSPECNODE_ONE_OR_MORE))
  45         {
  46             throw new RuntimeException("ImplementationMessages.VAL_UST");
  47         }
  48 
  49         // Store the node and init any data that needs it
  50         fChild = childNode;
  51     }
  52 
  53 
  54     // -------------------------------------------------------------------
  55     //  Package, final methods
  56     // -------------------------------------------------------------------
  57     final CMNode getChild()
  58     {
  59         return fChild;
  60     }
  61 
  62 
  63     // -------------------------------------------------------------------
  64     //  Package, inherited methods
  65     // -------------------------------------------------------------------
  66     public boolean isNullable()
  67     {
  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() == XMLContentSpec.CONTENTSPECNODE_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     {
  84         // Its just based on our child node's first pos
  85         toSet.setTo(fChild.firstPos());
  86     }
  87 
  88     protected void calcLastPos(CMStateSet toSet)
  89     {
  90         // Its just based on our child node's last pos
  91         toSet.setTo(fChild.lastPos());
  92     }
  93 
  94 
  95     // -------------------------------------------------------------------
  96     //  Private data members
  97     //
  98     //  fChild
  99     //      This is the reference to the one child that we have for this
 100     //      unary operation.
 101     // -------------------------------------------------------------------
 102     private CMNode  fChild;
 103 };