JAL-3026 srcjar files for VARNA and log4j

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

diff --git a/srcjar/org/apache/log4j/rewrite/MapRewritePolicy.java b/srcjar/org/apache/log4j/rewrite/MapRewritePolicy.java
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+++ b/srcjar/org/apache/log4j/rewrite/MapRewritePolicy.java
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+/*
+ * 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.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+
+import org.apache.log4j.Logger;
+import org.apache.log4j.spi.LoggingEvent;
+
+/**
+ * This policy rewrites events where the message of the
+ * original event implementes java.util.Map.
+ * All other events are passed through unmodified.
+ * If the map contains a "message" entry, the value will be
+ * used as the message for the rewritten event.  The rewritten
+ * event will have a property set that is the combination of the
+ * original property set and the other members of the message map.
+ * If both the original property set and the message map
+ * contain the same entry, the value from the message map
+ * will overwrite the original property set.
+ *
+ * The combination of the RewriteAppender and this policy
+ * performs the same actions as the MapFilter from log4j 1.3. 
+ */
+public class MapRewritePolicy implements RewritePolicy {
+    /**
+     * {@inheritDoc}
+     */
+    public LoggingEvent rewrite(final LoggingEvent source) {
+        Object msg = source.getMessage();
+        if (msg instanceof Map) {
+            Map props = new HashMap(source.getProperties());
+            Map eventProps = (Map) msg;
+            //
+            //   if the map sent in the logging request
+            //      has "message" entry, use that as the message body
+            //      otherwise, use the entire map.
+            //
+            Object newMsg = eventProps.get("message");
+            if (newMsg == null) {
+                newMsg = msg;
+            }
+
+            for(Iterator iter = eventProps.entrySet().iterator();
+                    iter.hasNext();
+                  ) {
+                Map.Entry entry = (Map.Entry) iter.next();
+                if (!("message".equals(entry.getKey()))) {
+                    props.put(entry.getKey(), entry.getValue());
+                }
+            }
+
+            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(),
+                    props);
+        } else {
+            return source;
+        }
+
+    }
+}