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The Apache Commons Codec package contains simple encoder and decoders for various formats such as Base64 and Hexadecimal. In addition to these widely used encoders and decoders, the codec package also maintains a collection of phonetic encoding utilities.

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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);
    }
}