Simplify new interface ExceptionHandler

Author: garydgregory

src/main/java/org/apache/commons/jxpath/ExceptionHandler.java

@@ -17,18 +17,14 @@
 
 package org.apache.commons.jxpath;
 
+import java.util.function.BiConsumer;
+
 /**
  * Exception handler interface. Actually handles Throwables.
  *
  * @since 1.4.0
  */
-public interface ExceptionHandler {
-
-    /**
-     * Handle an encountered Throwable.
-     *
-     * @param t   to handle
-     * @param ptr specific context
-     */
-    void handle(Throwable t, Pointer ptr);
+@FunctionalInterface
+public interface ExceptionHandler extends BiConsumer<Throwable, Pointer> {
+    // empty
 }

src/main/java/org/apache/commons/jxpath/ri/model/NodePointer.java

@@ -685,7 +685,7 @@ public void handle(final Throwable t) {
      */
     public void handle(final Throwable t, final NodePointer originator) {
         if (exceptionHandler != null) {
-            exceptionHandler.handle(t, originator);
+            exceptionHandler.accept(t, originator);
             return;
         }
         if (parent != null) {