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
015package org.apache.hivemind.parse;
016
017import java.util.HashSet;
018import java.util.Iterator;
019import 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 */
027public 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}