/**
 * 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 2000 (C) Intalio, Inc. All Rights Reserved.
 *
 * $Id: CollectionFieldHandler.java,v 1.1.1.1 2003/03/03 07:09:26 kvisco Exp $
 */

package org.exolab.castor.xml.handlers;

import org.exolab.castor.xml.TypeValidator;
import org.exolab.castor.xml.ValidationException;
import org.exolab.castor.mapping.FieldHandler;
import org.exolab.castor.mapping.ValidityException;
import org.exolab.castor.xml.XMLFieldHandler;
import java.util.StringTokenizer;

import java.lang.reflect.Array;

/**
 * A  FieldHandler for the XML Schema Collection type.
 * TODO : support all kind of XSList
 * @author <a href="blandin@intalio.com">Arnaud Blandin</a>
 * @version $Revision: 1.1.1.1 $ $Date: 2003/03/03 07:09:26 $
**/
public class CollectionFieldHandler extends XMLFieldHandler {

    private FieldHandler _handler = null;
    private TypeValidator _validator = null;

    //----------------/
    //- Constructors -/
    //----------------/

    /**
     * Creates a new CollectionFieldHandler using the given
     * FieldHandler for delegation.
     * @param fieldHandler the fieldHandler for delegation.
    **/
    public CollectionFieldHandler(FieldHandler fieldHandler) {

        if (fieldHandler == null) {
            String err = "The FieldHandler argument passed to " +
                "the constructor of CollectionFieldHandler must not be null.";
            throw new IllegalArgumentException(err);
        }
        this._handler = fieldHandler;
    } //-- CollectionFieldHandler

    public CollectionFieldHandler(FieldHandler fieldHandler, TypeValidator validator) {

        if (fieldHandler == null) {
            String err = "The FieldHandler argument passed to " +
                "the constructor of CollectionFieldHandler must not be null.";
            throw new IllegalArgumentException(err);
        }
        this._handler = fieldHandler;
        _validator = validator;
    } //-- CollectionFieldHandler

    //------------------/
    //- Public Methods -/
    //------------------/

    /**
     * Sets the value of the field associated with this descriptor.
     * @param target the object in which to set the value
     * @param value the value of the field
    **/
    public void setValue(Object target, Object value)
        throws java.lang.IllegalStateException
    {

        if ( value == null ) return;

        if (value instanceof String) {
            StringTokenizer temp = new StringTokenizer((java.lang.String)value," ");
            int size = temp.countTokens();
            for (int i=0; i<size; i++) {
                 String tempValue = temp.nextToken();
                 try {
                     if (_validator != null)
                        _validator.validate(tempValue, null);
                  } catch (ValidationException e) {
                      throw new IllegalStateException(e.getMessage());
                  }
                _handler.setValue(target, tempValue);
            }
        }
        else _handler.setValue(target, value);
    } //-- setValue

    /**
     * Gets the value of the field associated with this descriptor.
     * If the value is an array, it returns a string 'representing' this array
     * @param target the object in which to set the value
     * @param value the value of the field
    **/
    public Object getValue(Object target)
        throws java.lang.IllegalStateException
    {
        // Needs to return the proper object
        Object temp = _handler.getValue(target);

        if (temp == null) return temp;

        String result = null;
        if (temp.getClass().isArray()) {
            int size = Array.getLength(temp);
            if (size !=0) {
                result = "";
                int i=0;
                while (i < size) {
                    if (i > 0) result += ' ';
                    Object obj = Array.get(temp, i++);
                    result += obj.toString();
                }
            }
        }
        else result = temp.toString();
        return result;
    }

    public void resetValue(Object target)
        throws java.lang.IllegalStateException
    {
        _handler.resetValue(target);
    }


    /**
     * Checks the field validity. Returns successfully if the field
     * can be stored, is valid, etc, throws an exception otherwise.
     *
     * @param object The object
     * @throws ValidityException The field is invalid, is required and
     *  null, or any other validity violation
     * @throws IllegalStateException The Java object has changed and
     *  is no longer supported by this handler, or the handler
     *  is not compatiable with the Java object
     */
    public void checkValidity( Object object )
        throws ValidityException, IllegalStateException
    {
        //-- do nothing for now
    } //-- checkValidity


    /**
     * Creates a new instance of the object described by this field.
     *
     * @param parent The object for which the field is created
     * @return A new instance of the field's value
     * @throws IllegalStateException This field is a simple type and
     *  cannot be instantiated
     */
    public Object newInstance( Object parent )
        throws IllegalStateException
    {
         return null;
    } //-- newInstance

    /**
     * Returns true if the given object is an XMLFieldHandler that
     * is equivalent to the delegated handler. An equivalent XMLFieldHandler
	 * is an XMLFieldHandler that is an instances of the same class.
     *
     * @return true if the given object is an XMLFieldHandler that
     * is equivalent to this one.
    **/
    public boolean equals(Object obj) {
        if (obj == null) return false;
        if (!(obj instanceof XMLFieldHandler)) return false;
        return _handler.getClass().isInstance(obj);
    } //-- equals

} //-- CollectionFieldHandler