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/*
 * Copyright 2001-2004 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.axis.encoding.ser;

import org.apache.axis.Constants;
import org.apache.axis.components.logger.LogFactory;
import org.apache.axis.encoding.SerializationContext;
import org.apache.axis.encoding.Serializer;
import org.apache.axis.utils.IdentityHashMap;
import org.apache.axis.utils.Messages;
import org.apache.axis.wsdl.fromJava.Types;
import org.apache.commons.logging.Log;
import org.w3c.dom.Element;
import org.xml.sax.Attributes;

import javax.xml.namespace.QName;
import java.io.IOException;
import java.util.Iterator;
import java.util.Vector;

/**
 * A VectorSerializer is be used to serialize and
 * deserialize Vectors using the SOAP-ENC
 * encoding style.
 *
 *  @author Rich Scheuerle ([email protected])
 */

public class VectorSerializer implements Serializer
{
    protected static Log log =
        LogFactory.getLog(VectorSerializer.class.getName());

    /** Serialize a Vector
     *
     * Walk the collection of keys, serializing each key/value pair
     * inside an  element.
     *
     * @param name the desired QName for the element
     * @param attributes the desired attributes for the element
     * @param value the Object to serialize
     * @param context the SerializationContext in which to do all this
     * @exception IOException
     */
    public void serialize(QName name, Attributes attributes,
                          Object value, SerializationContext context)
        throws IOException
    {
        if (!(value instanceof Vector))
            throw new IOException(
                Messages.getMessage("noVector00", "VectorSerializer", 
                                     value.getClass().getName()));

        Vector vector = (Vector)value;
        
        // Check for circular references. 
        if(isRecursive(new IdentityHashMap(), vector)){
            throw new IOException(Messages.getMessage("badVector00"));
        }
        
        context.startElement(name, attributes);
        for (Iterator i = vector.iterator(); i.hasNext(); )
        {
            Object item = i.next();
            context.serialize(Constants.QNAME_LITERAL_ITEM,  null, item);
        }
        context.endElement();
    }

    public boolean isRecursive(IdentityHashMap map, Vector vector) 
    {
        map.add(vector);
        boolean recursive = false;
        for(int i=0;i