[Practicalxml-commits] SF.net SVN: practicalxml:[106] branches/dev-1.1/src/main/java/net/sf/ practicalxml/converter/bean2xml/Bean2XmlDriver.java

[Auto-Generated S. C. M. <pra...@li...>]

Revision: 106
          http://practicalxml.svn.sourceforge.net/practicalxml/?rev=106&view=rev
Author:   kdgregory
Date:     2009-08-14 20:20:09 +0000 (Fri, 14 Aug 2009)

Log Message:
-----------
attach dummy xsi:nil to root element to prevent repetitive namespace defs by serializer

Modified Paths:
--------------
    branches/dev-1.1/src/main/java/net/sf/practicalxml/converter/bean2xml/Bean2XmlDriver.java

Modified: branches/dev-1.1/src/main/java/net/sf/practicalxml/converter/bean2xml/Bean2XmlDriver.java
===================================================================
--- branches/dev-1.1/src/main/java/net/sf/practicalxml/converter/bean2xml/Bean2XmlDriver.java	2009-08-14 20:05:39 UTC (rev 105)
+++ branches/dev-1.1/src/main/java/net/sf/practicalxml/converter/bean2xml/Bean2XmlDriver.java	2009-08-14 20:20:09 UTC (rev 106)
@@ -24,6 +24,8 @@
 import java.util.EnumSet;
 import java.util.Map;
 
+import javax.xml.XMLConstants;
+
 import org.w3c.dom.Element;
 
 import net.sf.practicalxml.DomUtil;
@@ -76,6 +78,7 @@
     public Element convert(Object obj, String nsUri, String rootName)
     {
         Element root = DomUtil.newDocument(nsUri, rootName);
+        doXsiNamespaceHack(root);
         convert(obj, "", new DirectAppender(root, _options));
         return root;
     }
@@ -123,6 +126,32 @@
     }
 
 
+    /**
+     *  Introduces the XML Schema Instance namespace into the DOM tree using a
+     *  meaningless attribute. The Xerces serializer does not attempt to promote
+     *  namespace definitions above the subtree in which they first appear, which
+     *  means that the XSI definition could be repeated many times throughout the
+     *  serialized tree, adding bulk to the serialized representation.
+     *  <p>
+     *  By putting "nil=false" at the root element, we will keep the serializer
+     *  from inserting all these definitions. This has to happen <em>before</em>
+     *  any actual conversion, in case some bozo passes <code>null</code> to
+     *  the top-level conversion routine.
+     *  <p>
+     *  Note that we only do this if <code>xsi:nil</code> is enabled by itself.
+     *  If <code>xsi:type</code> is enabled, the converter will attach that
+     *  attribute to the root instead, thereby establishing the namespace context.
+     */
+    private void doXsiNamespaceHack(Element root)
+    {
+        if (_options.contains(Bean2XmlOptions.XSI_NIL)
+                && !_options.contains(Bean2XmlOptions.XSI_TYPE))
+        {
+            root.setAttributeNS(XMLConstants.W3C_XML_SCHEMA_INSTANCE_NS_URI, "nil", "false");
+        }
+    }
+
+
     private boolean tryToConvertAsPrimitiveOrNull(
             Object obj, Class<?> klass, String name, Appender appender)
     {


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