Diff to enable the conversion of boolean values to numeric 0 (false) or 1 (true) in the jmxtrans GraphiteWriter output model.

jmxtrans_graphitewriter_boolean_converter

diff --git a/src/com/googlecode/jmxtrans/model/output/GraphiteWriter.java b/src/com/googlecode/jmxtrans/model/output/GraphiteWriter.java
index 5d04014..ab52ca9 100644
--- a/src/com/googlecode/jmxtrans/model/output/GraphiteWriter.java
+++ b/src/com/googlecode/jmxtrans/model/output/GraphiteWriter.java
@@ -155,7 +155,7 @@ public class GraphiteWriter extends BaseOutputWriter {
                                Map<String, Object> resultValues = result.getValues();
                                if (resultValues != null) {
                                        for (Entry<String, Object> values : resultValues.entrySet()) {
-                                               Object value = values.getValue();
+                                               Object value = convertToNumeric(values.getValue());
                                                if (JmxUtils.isNumeric(value)) {
                                                        StringBuilder sb = new StringBuilder();

@@ -185,8 +185,18 @@ public class GraphiteWriter extends BaseOutputWriter {
                        pool.returnObject(address, socket);
                }
        }
-
-       /**
+
+  private Object convertToNumeric(Object value) {
+    if (value instanceof Boolean) {
+      Object newValue = Boolean.FALSE.equals(value) ? 0 : 1;
+      log.debug(String.format("Boolean value converted from %s to numeric %s", value, newValue));
+      return newValue;
+    } else {
+      return value;
+    }
+  }
+
+  /**
         * Starts the pool and register it with JMX
         *
         * @throws LifecycleException