XMLContextImpl.java

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/*
 * Javolution - Java(TM) Solution for Real-Time and Embedded Systems
 * Copyright (C) 2012 - Javolution (http://javolution.org/)
 * All rights reserved.
 * 
 * Permission to use, copy, modify, and distribute this software is
 * freely granted, provided that this notice is preserved.
 */
package javolution.xml.internal;
 
import java.util.Collection;
import java.util.Iterator;
import java.util.Map;
 
import javolution.util.FastMap;
import javolution.xml.DefaultXMLFormat;
import javolution.xml.XMLContext;
import javolution.xml.XMLFormat;
import javolution.xml.stream.XMLStreamException;
 
@SuppressWarnings("rawtypes")
public final class XMLContextImpl extends XMLContext {
 
    private final FastMap<Class<?>, XMLFormat<?>> formats = new FastMap<Class<?>, XMLFormat<?>>();
 
    @Override
    protected XMLContext inner() {
        XMLContextImpl ctx = new XMLContextImpl();
        ctx.formats.putAll(formats);
        return ctx;
    }
 
    @SuppressWarnings("unchecked")
    @Override
    protected <T> XMLFormat<T> searchFormat(Class<? extends T> type) {
        XMLFormat xml = formats.get(type);
        if (xml != null)
            return xml;
        DefaultXMLFormat format = type.getAnnotation(DefaultXMLFormat.class);
        if (format != null) {
            Class<? extends XMLFormat> formatClass = format.value();
            try {
                xml = formatClass.newInstance();
                synchronized (formats) { // Required since possible concurrent use 
                    // (getFormatInContext is not a configuration method).
                    formats.put(type, xml);
                }
                return xml;
            } catch (Throwable ex) {
                throw new RuntimeException(ex);
            }
        }
        // Check predefined format as last resource.
        if (Map.class.isAssignableFrom(type))
            return MAP_XML;
        if (Collection.class.isAssignableFrom(type))
            return COLLECTION_XML;
        return OBJECT_XML;
    }
 
    @Override
    public <T> void setFormat(Class<? extends T> type, XMLFormat<T> format) {
        formats.put(type, format);
    }
 
    // PREDEFINED FORMATS  //
 
    private static final XMLFormat OBJECT_XML = new XMLFormat.Default();
 
    private static final XMLFormat COLLECTION_XML = new XMLFormat() {
 
        @SuppressWarnings("unchecked")
        public void read(XMLFormat.InputElement xml, Object obj)
                throws XMLStreamException {
            Collection collection = (Collection) obj;
            while (xml.hasNext()) {
                collection.add(xml.getNext());
            }
        }
 
        public void write(Object obj, XMLFormat.OutputElement xml)
                throws XMLStreamException {
            Collection collection = (Collection) obj;
            for (Iterator i = collection.iterator(); i.hasNext();) {
                xml.add(i.next());
            }
        }
 
    };
 
    private static final XMLFormat MAP_XML = new XMLFormat() {
 
        @SuppressWarnings("unchecked")
        public void read(XMLFormat.InputElement xml, Object obj)
                throws XMLStreamException {
            final Map map = (Map) obj;
            while (xml.hasNext()) {
                Object key = xml.get("Key");
                Object value = xml.get("Value");
                map.put(key, value);
            }
        }
 
        public void write(Object obj, XMLFormat.OutputElement xml)
                throws XMLStreamException {
            final Map map = (Map) obj;
            for (Iterator it = map.entrySet().iterator(); it.hasNext();) {
                Map.Entry entry = (Map.Entry) it.next();
                xml.add(entry.getKey(), "Key");
                xml.add(entry.getValue(), "Value");
            }
        }
 
    };
 
}