javolution.xml.internal.XMLContextImpl Maven / Gradle / Ivy
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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;
/**
* Holds the default implementation of XMLContext.
*
* @author Jean-Marie Dautelle
* @version 6.0, July 21, 2013
*/
@SuppressWarnings("rawtypes")
public final class XMLContextImpl extends XMLContext {
private final FastMap, XMLFormat> formats = new FastMap, XMLFormat>();
@Override
protected XMLContext inner() {
XMLContextImpl ctx = new XMLContextImpl();
ctx.formats.putAll(formats);
return ctx;
}
@SuppressWarnings("unchecked")
@Override
protected XMLFormat searchFormat(Class type) {
XMLFormat xml = formats.get(type);
if (xml != null)
return xml;
DefaultXMLFormat format = type.getAnnotation(DefaultXMLFormat.class);
if (format != null) {
Class 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 void setFormat(Class type, XMLFormat format) {
formats.put(type, format);
}
/////////////////////////
// PREDEFINED FORMATS //
/////////////////////////
/**
* Holds the static XML format for java.lang.Object.class instances.
* The XML representation consists of the text representation of the object
* as a "value" attribute.
*/
private static final XMLFormat OBJECT_XML = new XMLFormat.Default();
/**
* Holds the default XML representation for java.util.Collection
* instances. This representation consists of nested XML elements one for
* each element of the collection. The elements' order is defined by
* the collection iterator order. Collections are deserialized using their
* default constructor.
*/
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());
}
}
};
/**
* Holds the default XML representation for java.util.Map
* instances. This representation consists of key/value pair as nested
* XML elements. For example:[code]
*
* [/code]
*
* The elements' order is defined by the map's entries iterator order.
* Maps are deserialized using their default constructor.
*/
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");
}
}
};
}