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/*   Copyright 2004 The Apache Software Foundation
 *
 *   Licensed under the Apache License, Version 2.0 (the "License");
 *   you may not use this file except in compliance with the License.
 *   You may obtain a copy of the License at
 *
 *       http://www.apache.org/licenses/LICENSE-2.0
 *
 *   Unless required by applicable law or agreed to in writing, software
 *   distributed under the License is distributed on an "AS IS" BASIS,
 *   WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 *   See the License for the specific language governing permissions and
 *  limitations under the License.
 */
/**
 * Author: Cezar Andrei ( cezar.andrei at bea.com )
 * Date: Apr 25, 2004
 */
package org.apache.xmlbeans.impl.config;

import java.util.Set;
import java.util.HashSet;

/**
 * Used to build {@link NameSet NameSets}.
 */
public class NameSetBuilder
{
    private boolean _isFinite;
    private Set _finiteSet;

    /**
     * Creates an empty builder for a NameSet.
     */
    public NameSetBuilder()
    {
        _isFinite = true;
        _finiteSet = new HashSet();
    }

    /**
     * Inverts the representing NameSet
     */
    public void invert()
    {
        _isFinite = !_isFinite;
    }

    /**
     * Adds a name to the representing NameSet
     * @param name
     */
    public void add(String name)
    {
        if (_isFinite )
            _finiteSet.add(name);
        else
            _finiteSet.remove(name);
    }

    /**
     * Creates a new NameSet with the current state.
     * @return created NameSet
     */
    public NameSet toNameSet()
    {
        if ( _finiteSet.size()==0 )
            if ( _isFinite )
                return NameSet.EMPTY;
            else
                return NameSet.EVERYTHING;
        else
            return NameSet.newInstance(_isFinite, _finiteSet);
    }
}