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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.
 */

package org.apache.xmlbeans.impl.schema;

import org.apache.xmlbeans.SchemaParticle;
import org.apache.xmlbeans.QNameSet;
import org.apache.xmlbeans.SchemaType;
import org.apache.xmlbeans.XmlObject;
import org.apache.xmlbeans.XmlAnySimpleType;
import org.apache.xmlbeans.XmlQName;
import org.apache.xmlbeans.impl.values.NamespaceContext;

import java.math.BigInteger;

import javax.xml.namespace.QName;

public class SchemaParticleImpl implements SchemaParticle
{
    private int _particleType;
    private BigInteger _minOccurs;
    private BigInteger _maxOccurs;
    private SchemaParticle[] _particleChildren;
    private boolean _isImmutable;
    private QNameSet _startSet;
    private QNameSet _excludeNextSet;
    private boolean _isSkippable;
    private boolean _isDeterministic;
    private int _intMinOccurs;
    private int _intMaxOccurs;
    private QNameSet _wildcardSet;
    private int _wildcardProcess;
    private String _defaultText;
    private boolean _isDefault;
    private boolean _isFixed;
    private QName _qName;
    private boolean _isNillable;
    private SchemaType.Ref _typeref;
    protected XmlObject _parseObject;
    private Object _userData;
    private XmlValueRef _defaultValue;

    protected void mutate()
        { if (_isImmutable) throw new IllegalStateException(); }

    public void setImmutable()
        { mutate(); _isImmutable = true; }

    public boolean hasTransitionRules()
        { return (_startSet != null); }

    public boolean hasTransitionNotes()
        { return (_excludeNextSet != null); }

    public void setTransitionRules(QNameSet start,
                                   boolean isSkippable)
    {
        _startSet = start;
        _isSkippable = isSkippable;
    }

    public void setTransitionNotes(QNameSet excludeNext, boolean isDeterministic)
    {
        _excludeNextSet = excludeNext;
        _isDeterministic = isDeterministic;
    }

    public boolean canStartWithElement(QName name)
        { return name != null && _startSet.contains(name); }

    public QNameSet acceptedStartNames()
        { return _startSet; }

    public QNameSet getExcludeNextSet()
        { return _excludeNextSet; }

    public boolean isSkippable()
        { return _isSkippable; }

    public boolean isDeterministic()
        { return _isDeterministic; }

    public int getParticleType()
        { return _particleType; }

    public void setParticleType(int pType)
        { mutate(); _particleType = pType; }

    public boolean isSingleton()
        { return _maxOccurs != null &&
                 _maxOccurs.compareTo(BigInteger.ONE) == 0 &&
                 _minOccurs.compareTo(BigInteger.ONE) == 0; }

    public BigInteger getMinOccurs()
        { return _minOccurs; }

    public void setMinOccurs(BigInteger min)
        { mutate(); _minOccurs = min; _intMinOccurs = pegBigInteger(min); }

    public int getIntMinOccurs()
        { return _intMinOccurs; }

    public BigInteger getMaxOccurs()
        { return _maxOccurs; }

    public int getIntMaxOccurs()
        { return _intMaxOccurs; }

    public void setMaxOccurs(BigInteger max)
        { mutate(); _maxOccurs = max; _intMaxOccurs = pegBigInteger(max); }

    public SchemaParticle[] getParticleChildren()
    {
        if (_particleChildren == null)
        {
            assert _particleType != SchemaParticle.ALL &&
                _particleType != SchemaParticle.SEQUENCE &&
                _particleType != SchemaParticle.CHOICE;
            return null;
        }
        SchemaParticle[] result = new SchemaParticle[_particleChildren.length];
        System.arraycopy(_particleChildren, 0, result, 0, _particleChildren.length);
        return result;
    }

    public void setParticleChildren(SchemaParticle[] children)
        { mutate(); _particleChildren = children; }

    public SchemaParticle getParticleChild(int i)
        { return _particleChildren[i]; }

    public int countOfParticleChild()
        { return _particleChildren == null ? 0 : _particleChildren.length; }

    public void setWildcardSet(QNameSet set)
        { mutate(); _wildcardSet = set; }

    public QNameSet getWildcardSet()
        { return _wildcardSet; }

    public void setWildcardProcess(int process)
        { mutate(); _wildcardProcess = process; }

    public int getWildcardProcess()
        { return _wildcardProcess; }

    private static final BigInteger _maxint = BigInteger.valueOf(Integer.MAX_VALUE);

    private static final int pegBigInteger(BigInteger bi)
    {
        if (bi == null)
            return Integer.MAX_VALUE;
        if (bi.signum() <= 0)
            return 0;
        if (bi.compareTo(_maxint) >= 0)
            return Integer.MAX_VALUE;
        return bi.intValue();
    }

    public QName getName()
        { return _qName; }

    public void setNameAndTypeRef(QName formname, SchemaType.Ref typeref)
        { mutate(); _qName = formname; _typeref = typeref; }

    public boolean isTypeResolved()
    {
        return (_typeref != null);
    }

    public void resolveTypeRef(SchemaType.Ref typeref)
    {
        if (_typeref != null)
            throw new IllegalStateException();
        _typeref = typeref;
    }

    public boolean isAttribute()
        { return false; }

    public SchemaType getType()
        { if (_typeref == null) return null; return _typeref.get(); }

    public String getDefaultText()
        { return _defaultText; }

    public boolean isDefault()
        { return _isDefault; }

    public boolean isFixed()
        { return _isFixed; }

    public void setDefault(String deftext, boolean isFixed, XmlObject parseObject)
    {
        mutate();
        _defaultText = deftext;
        _isDefault = (deftext != null);
        _isFixed = isFixed;
        _parseObject = parseObject;
    }

    public boolean isNillable()
        { return _isNillable; }

    public void setNillable(boolean nillable)
        { mutate(); _isNillable = nillable; }

    public XmlAnySimpleType getDefaultValue()
    {
        if (_defaultValue != null)
            return _defaultValue.get();
        if (_defaultText != null && XmlAnySimpleType.type.isAssignableFrom(getType()))
        {
            if (_parseObject != null && XmlQName.type.isAssignableFrom(getType()))
            {
                try
                {
                    NamespaceContext.push(new NamespaceContext(_parseObject));
                    return getType().newValue(_defaultText);
                }
                finally
                {
                    NamespaceContext.pop();
                }
            }
            return getType().newValue(_defaultText);
        }
        return null;
    }
    
    public void setDefaultValue(XmlValueRef defaultRef)
    {
        mutate();
        _defaultValue = defaultRef;
    }

    public Object getUserData()
    {
        return _userData;
    }

    public void setUserData(Object data)
    {
        _userData = data;
    }
}