JAL-3026 srcjar files for VARNA and log4j

[jalview.git] / srcjar / org / apache / log4j / rewrite / ReflectionRewritePolicy.java

diff --git a/srcjar/org/apache/log4j/rewrite/ReflectionRewritePolicy.java b/srcjar/org/apache/log4j/rewrite/ReflectionRewritePolicy.java
new file mode 100644 (file)
index 0000000..f1a4cc5
--- /dev/null
+++ b/srcjar/org/apache/log4j/rewrite/ReflectionRewritePolicy.java
@@ -0,0 +1,89 @@
+/*
+ * 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;
+    }
+}