Add getEmptyAttributes helper

Signed-off-by: Tony Germano <[email protected]>

Author: tonygermano

server/src/org/openintegrationengine/engine/plugins/datatypes/AbstractXMLReader.java

@@ -14,6 +14,7 @@
 import org.xml.sax.SAXNotRecognizedException;
 import org.xml.sax.SAXNotSupportedException;
 import org.xml.sax.XMLReader;
+import org.xml.sax.helpers.AttributesImpl;
 
 /**
  * A base class for custom XMLReaders used in data type plugins.
@@ -37,6 +38,9 @@ public abstract class AbstractXMLReader implements XMLReader {
     /** The EntityResolver to resolve external entities. */
     protected EntityResolver entityResolver;
 
+    /** Reusable instance that is cleared on each call of the accessor */
+    private final AttributesImpl emptyAttributes = new AttributesImpl();
+
     /**
      * Helper method for subclasses to ensure the ContentHandler is configured.
      * <p>
@@ -51,6 +55,20 @@ protected void ensureHandlerSet() throws SAXException {
         }
     }
 
+    /**
+     * Helper method for subclasses to get an empty instance of {@link AttributesImpl}.
+     * <p>
+     * This method reuses the same instance of {@link AttributesImpl} and clears it
+     * before use.
+     * </p>
+     * 
+     * @return An empty instance of {@link AttributesImpl}
+     */
+    protected AttributesImpl getEmptyAttributes() {
+        emptyAttributes.clear();
+        return emptyAttributes;
+    }
+
     /**
      * Parse an XML document from the given input source.
      * <p>