001    // Copyright 2004, 2005 The Apache Software Foundation
002    //
003    // Licensed under the Apache License, Version 2.0 (the "License");
004    // you may not use this file except in compliance with the License.
005    // You may obtain a copy of the License at
006    //
007    //     http://www.apache.org/licenses/LICENSE-2.0
008    //
009    // Unless required by applicable law or agreed to in writing, software
010    // distributed under the License is distributed on an "AS IS" BASIS,
011    // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
012    // See the License for the specific language governing permissions and
013    // limitations under the License.
014    
015    package org.apache.hivemind.parse;
016    
017    import java.util.HashSet;
018    import java.util.Iterator;
019    import java.util.Set;
020    
021    /**
022     * Used by {@link org.apache.hivemind.parse.DescriptorParser} to
023     * track which attributes are expected for an element, and which are required.
024     *
025     * @author Howard Lewis Ship
026     */
027    public class ElementParseInfo
028    {
029        private Set _knownAttributes = new HashSet();
030        private Set _requiredAttributes = new HashSet();
031    
032        public void addAttribute(String name, boolean required)
033        {
034            _knownAttributes.add(name);
035    
036            if (required)
037                _requiredAttributes.add(name);
038        }
039    
040        public boolean isKnown(String attributeName)
041        {
042            return _knownAttributes.contains(attributeName);
043        }
044    
045        /**
046         * Returns all the required attribute names as
047         * an Iterator (of String).
048         */
049        public Iterator getRequiredNames()
050        {
051            return _requiredAttributes.iterator();
052        }
053    }