/*   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.*;
import org.apache.xmlbeans.impl.values.NamespaceContext;

import javax.xml.namespace.QName;
import java.math.BigInteger;

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 == null) ? null : children.clone();
    }

    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 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;
    }
}