made ILinkedDataFragment an extension of the Closable interface

Author: Olaf Hartig

src/org/linkeddatafragments/fragments/ILinkedDataFragment.java

@@ -1,13 +1,15 @@
 package org.linkeddatafragments.fragments;
 
+import java.io.Closeable;
+
 import com.hp.hpl.jena.rdf.model.StmtIterator;
 
 /**
  * Represents any possible Linked Data Fragment.
  *
  * @author <a href="http://olafhartig.de">Olaf Hartig</a>
  */
-public interface ILinkedDataFragment
+public interface ILinkedDataFragment extends Closeable
 {
     /**
      * Returns an iterator over the RDF data of this fragment (possibly only

src/org/linkeddatafragments/fragments/LinkedDataFragmentBase.java

@@ -34,6 +34,14 @@ protected LinkedDataFragmentBase( final String fragmentURL,
         this.isLastPage = isLastPage;
     }
 
+    /**
+     * Does nothing. May be overridden by subclasses that hold some objects
+     * that need to be closed (such as iterators from the underlying data
+     * source).
+     */
+    @Override
+    public void close() {}
+
     @Override
     public boolean isPageOnly() {
         return true;