+/*
+ * Licensed to the Apache Software Foundation (ASF) under one or more
+ * contributor license agreements. See the NOTICE file distributed with
+ * this work for additional information regarding copyright ownership.
+ * The ASF licenses this file to You under the Apache License, Version 2.0
+ * (the "License"); you may not use this file except in compliance with
+ * the License. You may obtain a copy of the License at
+ *
+ * http://www.apache.org/licenses/LICENSE-2.0
+ *
+ * Unless required by applicable law or agreed to in writing, software
+ * distributed under the License is distributed on an "AS IS" BASIS,
+ * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
+ * See the License for the specific language governing permissions and
+ * limitations under the License.
+ */
+package org.apache.log4j.rewrite;
+
+import java.beans.Introspector;
+import java.beans.PropertyDescriptor;
+import java.util.HashMap;
+import java.util.Map;
+
+import org.apache.log4j.Logger;
+import org.apache.log4j.helpers.LogLog;
+import org.apache.log4j.spi.LoggingEvent;
+
+/**
+ * This policy rewrites events by evaluating any
+ * JavaBean properties on the message object and adding them
+ * to the event properties. If the message object has a
+ * message property, the value of that property will be
+ * used as the message for the rewritten event and will
+ * not be added to the event properties. Values from the
+ * JavaBean properties will replace any existing property
+ * with the same name.
+ *
+ * The combination of the RewriteAppender and this policy
+ * performs the same actions as the ReflectionFilter from log4j 1.3.
+ */
+public class ReflectionRewritePolicy implements RewritePolicy {
+ /**
+ * {@inheritDoc}
+ */
+ public LoggingEvent rewrite(final LoggingEvent source) {
+ Object msg = source.getMessage();
+ if (!(msg instanceof String)) {
+ Object newMsg = msg;
+ Map rewriteProps = new HashMap(source.getProperties());
+
+ try {
+ PropertyDescriptor[] props = Introspector.getBeanInfo(
+ msg.getClass(), Object.class).getPropertyDescriptors();
+ if (props.length > 0) {
+ for (int i=0;i<props.length;i++) {
+ try {
+ Object propertyValue =
+ props[i].getReadMethod().invoke(msg,
+ (Object[]) null);
+ if ("message".equalsIgnoreCase(props[i].getName())) {
+ newMsg = propertyValue;
+ } else {
+ rewriteProps.put(props[i].getName(), propertyValue);
+ }
+ } catch (Exception e) {
+ LogLog.warn("Unable to evaluate property " +
+ props[i].getName(), e);
+ }
+ }
+ return new LoggingEvent(
+ source.getFQNOfLoggerClass(),
+ source.getLogger() != null ? source.getLogger(): Logger.getLogger(source.getLoggerName()),
+ source.getTimeStamp(),
+ source.getLevel(),
+ newMsg,
+ source.getThreadName(),
+ source.getThrowableInformation(),
+ source.getNDC(),
+ source.getLocationInformation(),
+ rewriteProps);
+ }
+ } catch (Exception e) {
+ LogLog.warn("Unable to get property descriptors", e);
+ }
+
+ }
+ return source;
+ }
+}