/*
Copyright (c) 2003, Dennis M. Sosnoski
All rights reserved.

Redistribution and use in source and binary forms, with or without modification,
are permitted provided that the following conditions are met:

 * Redistributions of source code must retain the above copyright notice, this
   list of conditions and the following disclaimer.
 * 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.
 * Neither the name of JiBX nor the names of its contributors may be used
   to endorse or promote products derived from this software without specific
   prior written permission.

THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND
ANY EXPRESS 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 THE COPYRIGHT OWNER OR 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.
*/

package example16;

import java.util.HashMap;
import java.util.Iterator;
import java.util.Map;

import org.jibx.runtime.IAliasable;
import org.jibx.runtime.IMarshallable;
import org.jibx.runtime.IMarshaller;
import org.jibx.runtime.IMarshallingContext;
import org.jibx.runtime.IUnmarshaller;
import org.jibx.runtime.IUnmarshallingContext;
import org.jibx.runtime.JiBXException;
import org.jibx.runtime.impl.MarshallingContext;
import org.jibx.runtime.impl.UnmarshallingContext;

public class HashMapper implements IMarshaller, IUnmarshaller, IAliasable
{
    private static final String SIZE_ATTRIBUTE_NAME = "size";
    private static final String ENTRY_ELEMENT_NAME = "entry";
    private static final String KEY_ATTRIBUTE_NAME = "key";
    private static final int DEFAULT_SIZE = 10;
    
    private String m_uri;
    private int m_index;
    private String m_name;
    
    public HashMapper() {
        m_uri = null;
        m_index = 0;
        m_name = "hashmap";
    }
    
    public HashMapper(String uri, int index, String name) {
        m_uri = uri;
        m_index = index;
        m_name = name;
    }
    
    /* (non-Javadoc)
     * @see org.jibx.runtime.IMarshaller#isExtension(int)
     */
    
    public boolean isExtension(int index) {
        return false;
    }

    /* (non-Javadoc)
     * @see org.jibx.runtime.IMarshaller#marshal(java.lang.Object,
     *  org.jibx.runtime.IMarshallingContext)
     */
    
    public void marshal(Object obj, IMarshallingContext ictx)
        throws JiBXException {
        
        // make sure the parameters are as expected
        if (!(obj instanceof HashMap)) {
            throw new JiBXException("Invalid object type for marshaller");
        } else if (!(ictx instanceof MarshallingContext)) {
            throw new JiBXException("Invalid object type for marshaller");
        } else {
            
            // start by generating start tag for container
            MarshallingContext ctx = (MarshallingContext)ictx;
            HashMap map = (HashMap)obj;
            ctx.startTagAttributes(m_index, m_name).
                attribute(m_index, SIZE_ATTRIBUTE_NAME, map.size()).
                closeStartContent();
            
            // loop through all entries in hashmap
            Iterator iter = map.entrySet().iterator();
            while (iter.hasNext()) {
                Map.Entry entry = (Map.Entry)iter.next();
                ctx.startTagAttributes(m_index, ENTRY_ELEMENT_NAME);
                if (entry.getKey() != null) {
                    ctx.attribute(m_index, KEY_ATTRIBUTE_NAME,
                        entry.getKey().toString());
                }
                ctx.closeStartContent();
                if (entry.getValue() instanceof IMarshallable) {
                    ((IMarshallable)entry.getValue()).marshal(ctx);
                    ctx.endTag(m_index, ENTRY_ELEMENT_NAME);
                } else {
                    throw new JiBXException("Mapped value is not marshallable");
                }
            }
            
            // finish with end tag for container element
            ctx.endTag(m_index, m_name);
        }
    }

    /* (non-Javadoc)
     * @see org.jibx.runtime.IUnmarshaller#isPresent(org.jibx.runtime.IUnmarshallingContext)
     */
     
    public boolean isPresent(IUnmarshallingContext ctx) throws JiBXException {
        return ctx.isAt(m_uri, m_name);
    }

    /* (non-Javadoc)
     * @see org.jibx.runtime.IUnmarshaller#unmarshal(java.lang.Object,
     *  org.jibx.runtime.IUnmarshallingContext)
     */
     
    public Object unmarshal(Object obj, IUnmarshallingContext ictx)
        throws JiBXException {
        
        // make sure we're at the appropriate start tag
        UnmarshallingContext ctx = (UnmarshallingContext)ictx;
        if (!ctx.isAt(m_uri, m_name)) {
            ctx.throwStartTagNameError(m_uri, m_name);
        }
        
        // create new hashmap if needed
        int size = ctx.attributeInt(m_uri, SIZE_ATTRIBUTE_NAME, DEFAULT_SIZE);
        HashMap map = (HashMap)obj;
        if (map == null) {
            map = new HashMap(size);
        }
        
        // process all entries present in document
        ctx.parsePastStartTag(m_uri, m_name);
        while (ctx.isAt(m_uri, ENTRY_ELEMENT_NAME)) {
            Object key = ctx.attributeText(m_uri, KEY_ATTRIBUTE_NAME, null);
            ctx.parsePastStartTag(m_uri, ENTRY_ELEMENT_NAME);
            Object value = ctx.unmarshalElement();
            map.put(key, value);
            ctx.parsePastEndTag(m_uri, ENTRY_ELEMENT_NAME);
        }
        ctx.parsePastEndTag(m_uri, m_name);
        return map;
    }
}