Element


1   /*
2    * @(#)Element.java 1.9 03/12/19
3    *
4    * Copyright 2004 Sun Microsystems, Inc. All rights reserved.
5    * SUN PROPRIETARY/CONFIDENTIAL. Use is subject to license terms.
6    */
7   
8   package javax.swing.text.html.parser;
9   
10  import java.util.Hashtable  ;
11  import java.util.BitSet  ;
12  import java.io.*;
13  
14  /**
15   * An element as described in a DTD using the ELEMENT construct.
16   * This is essentiall the description of a tag. It describes the
17   * type, content model, attributes, attribute types etc. It is used
18   * to correctly parse a document by the Parser.
19   *
20   * @see DTD
21   * @see AttributeList
22   * @version 1.9, 12/19/03
23   * @author Arthur van Hoff
24   */
25  public final
26  class Element implements DTDConstants  , Serializable {
27      public int index;
28      public String   name;
29      public boolean oStart;
30      public boolean oEnd;
31      public BitSet   inclusions;
32      public BitSet   exclusions;
33      public int type = ANY;
34      public ContentModel   content;
35      public AttributeList   atts;
36  
37      static int maxIndex = 0;
38  
39      /**
40       * A field to store user data. Mostly used to store
41       * style sheets.
42       */
43      public Object   data;
44  
45      Element() {
46      }
47  
48      /**
49       * Create a new element.
50       */
51      Element(String   name, int index) {
52      this.name = name;
53      this.index = index;
54      maxIndex = Math.max(maxIndex, index);
55      }
56  
57      /**
58       * Get the name of the element.
59       */
60      public String   getName() {
61      return name;
62      }
63  
64      /**
65       * Return true if the start tag can be omitted.
66       */
67      public boolean omitStart() {
68      return oStart;
69      }
70  
71      /**
72       * Return true if the end tag can be omitted.
73       */
74      public boolean omitEnd() {
75      return oEnd;
76      }
77  
78      /**
79       * Get type.
80       */
81      public int getType() {
82      return type;
83      }
84  
85      /**
86       * Get content model
87       */
88      public ContentModel   getContent() {
89      return content;
90      }
91  
92      /**
93       * Get the attributes.
94       */
95      public AttributeList   getAttributes() {
96      return atts;
97      }
98  
99      /**
100      * Get index.
101      */
102     public int getIndex() {
103     return index;
104     }
105 
106     /**
107      * Check if empty
108      */
109     public boolean isEmpty() {
110     return type == EMPTY;
111     }
112 
113     /**
114      * Convert to a string.
115      */
116     public String   toString() {
117     return name;
118     }
119 
120     /**
121      * Get an attribute by name.
122      */
123     public AttributeList   getAttribute(String   name) {
124     for (AttributeList   a = atts ; a != null ; a = a.next) {
125         if (a.name.equals(name)) {
126         return a;
127         }
128     }
129     return null;
130     }
131 
132     /**
133      * Get an attribute by value.
134      */
135     public AttributeList   getAttributeByValue(String   name) {
136     for (AttributeList   a = atts ; a != null ; a = a.next) {
137         if ((a.values != null) && a.values.contains(name)) {
138         return a;
139         }
140     }
141     return null;
142     }
143 
144 
145     static Hashtable   contentTypes = new Hashtable  ();
146 
147     static {
148     contentTypes.put("CDATA", new Integer  (CDATA));
149     contentTypes.put("RCDATA", new Integer  (RCDATA));
150     contentTypes.put("EMPTY", new Integer  (EMPTY));
151     contentTypes.put("ANY", new Integer  (ANY));
152     }
153 
154     public static int name2type(String   nm) {
155     Integer   val = (Integer  )contentTypes.get(nm);
156     return (val != null) ? val.intValue() : 0;
157     }
158 }
159
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