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Java > Open Source Codes > org > apache > hivemind > parse > ElementParseInfo


1 // Copyright 2004, 2005 The Apache Software Foundation
2 //
3 // Licensed under the Apache License, Version 2.0 (the "License");
4 // you may not use this file except in compliance with the License.
5 // You may obtain a copy of the License at
6 //
7 // http://www.apache.org/licenses/LICENSE-2.0
8 //
9 // Unless required by applicable law or agreed to in writing, software
10 // distributed under the License is distributed on an "AS IS" BASIS,
11 // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
12 // See the License for the specific language governing permissions and
13 // limitations under the License.
14
15 package org.apache.hivemind.parse;
16
17 import java.util.HashSet JavaDoc;
18 import java.util.Iterator JavaDoc;
19 import java.util.Set JavaDoc;
20
21 /**
22  * Used by {@link org.apache.hivemind.parse.DescriptorParser} to
23  * track which attributes are expected for an element, and which are required.
24  *
25  * @author Howard Lewis Ship
26  */
27 public class ElementParseInfo
28 {
29     private Set JavaDoc _knownAttributes = new HashSet JavaDoc();
30     private Set JavaDoc _requiredAttributes = new HashSet JavaDoc();
31
32     public void addAttribute(String JavaDoc name, boolean required)
33     {
34         _knownAttributes.add(name);
35
36         if (required)
37             _requiredAttributes.add(name);
38     }
39
40     public boolean isKnown(String JavaDoc attributeName)
41     {
42         return _knownAttributes.contains(attributeName);
43     }
44
45     /**
46      * Returns all the required attribute names as
47      * an Iterator (of String).
48      */
49     public Iterator JavaDoc getRequiredNames()
50     {
51         return _requiredAttributes.iterator();
52     }
53 }
54
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