/**
 * Redistribution and use of this software and associated documentation
 * ("Software"), with or without modification, are permitted provided
 * that the following conditions are met:
 *
 * 1. Redistributions of source code must retain copyright
 *    statements and notices.  Redistributions must also contain a
 *    copy of this document.
 *
 * 2. Redistributions in binary form must reproduce the
 *    above copyright notice, this list of conditions and the
 *    following disclaimer in the documentation and/or other
 *    materials provided with the distribution.
 *
 * 3. The name "Exolab" must not be used to endorse or promote
 *    products derived from this Software without prior written
 *    permission of Intalio, Inc.  For written permission,
 *    please contact info@exolab.org.
 *
 * 4. Products derived from this Software may not be called "Exolab"
 *    nor may "Exolab" appear in their names without prior written
 *    permission of Intalio, Inc. Exolab is a registered
 *    trademark of Intalio, Inc.
 *
 * 5. Due credit should be given to the Exolab Project
 *    (http://www.exolab.org/).
 *
 * THIS SOFTWARE IS PROVIDED BY INTALIO, INC. AND CONTRIBUTORS
 * ``AS IS'' AND ANY EXPRESSED OR IMPLIED WARRANTIES, INCLUDING, BUT
 * NOT LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND
 * FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.  IN NO EVENT SHALL
 * INTALIO, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT,
 * INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES
 * (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR
 * SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE)
 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED
 * OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 * Copyright 1999-2004 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id: UnmarshalState.java,v 1.8 2004/12/11 09:25:45 kvisco Exp $
 */

package org.exolab.castor.xml;

import java.util.HashSet;

/**
 * The state information class for the UnmarshalHandler
 * 
 * @author <a href="mailto:kvisco-at-intalio.com">Keith Visco</a>
 * @revision $Revision: 1.8 $ $Date: 2004/12/11 09:25:45 $
 */
class UnmarshalState {
    
    /**
     * Holds on to Constructor arguments
     */
    UnmarshalHandler.Arguments args = null;
    
    /**
     * Holds the current location path
     */
    String location = "";
    
    /**
     * indicates if the xsi:nil='true' attribute
     * was present on the element
     */
    boolean nil = false;
    
    /**
     * The xml element name of the current object
     */
    String elementName = null;

    /**
     * Characters read in during unmarshalling
     */
    StringBuffer buffer = null;

    /**
     * The key for the object. This may be null if no key
     * or identity has been specified.
     */
    Object key = null;
    
    /**
     * The current that we are unmarshalling to
     */
    Object object = null;

    
    /**
     * The class of the object, mainly used for primitives
     */
    Class type = null;

    /**
     * The field descriptor for the Object
     */
    XMLFieldDescriptor fieldDesc = null;


    /**
     * The class descriptor for the Object, in case
     * FieldDescriptor#getClassDescriptor returns null
     */
    XMLClassDescriptor classDesc = null;

    /**
     * Is the field a primitive or immutable type?
     */
    boolean primitiveOrImmutable = false;

    /**
     * The list of *used* field descriptors
     * Note: Initialized upon demand, no need to create
     * the list for primitive fields
     */
    private HashSet _markedList = null;

    /**
     * Is this a derived field? 
     */
    boolean derived = false;
    
    /**
     * Is this a wrapper state?
     */
    boolean wrapper = false;
    
    /**
     * The whitespace preserve flag
     */
    boolean wsPreserve = false;
    
    boolean trailingWhitespaceRemoved = false;
    
    /**
     * The UnmarshalState which contains information
     * about the parent object for object containted
     * within this state. Used when handling
     * element containers/wrappers.
     */
    UnmarshalState targetState = null;
    
    /**
     * A reference to the parent state.
     */
    UnmarshalState parent = null;

    UnmarshalState() {
        super();
    }
    
    /**
     * Reinitializes all variables
     */
    void clear() {
        
        args = null;
        location = "";
        elementName = null;
        buffer = null;
        key = null;
        nil = false;
        object = null;
        type = null;
        fieldDesc = null;
        classDesc = null;
        primitiveOrImmutable = false;
        if (_markedList != null) {
            _markedList.clear();
        }
        derived = false;
        wrapper = false;
        targetState = null;
        wsPreserve = false;
        parent = null;
        trailingWhitespaceRemoved = false;
    } //-- clear

    /**
     * Marks the given XMLFieldDescriptor as having been used
     * @param descriptor the XMLFieldDescriptor to mark
    **/
    void markAsUsed(XMLFieldDescriptor descriptor) {
        if (_markedList == null)
            _markedList = new HashSet(5);
        _markedList.add(descriptor);
    } //-- markAsUsed

    void markAsNotUsed(XMLFieldDescriptor descriptor) {
        if (_markedList == null) return;
        _markedList.remove(descriptor);
    }

    boolean isUsed(XMLFieldDescriptor descriptor) {
        if (_markedList == null) return false;
        return _markedList.contains(descriptor);
    } //-- isUsed

    

} //-- UnmarshalState
