+/*
+ * 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.Collections;
+import java.util.HashMap;
+import java.util.Iterator;
+import java.util.Map;
+import java.util.StringTokenizer;
+
+import org.apache.log4j.Logger;
+import org.apache.log4j.spi.LoggingEvent;
+
+/**
+ * This policy rewrites events by adding
+ * a user-specified list of properties to the event.
+ * Existing properties are not modified.
+ *
+ * The combination of the RewriteAppender and this policy
+ * performs the same actions as the PropertyFilter from log4j 1.3.
+ */
+
+public class PropertyRewritePolicy implements RewritePolicy {
+ private Map properties = Collections.EMPTY_MAP;
+ public PropertyRewritePolicy() {
+ }
+
+ /**
+ * Set a string representing the property name/value pairs.
+ *
+ * Form: propname1=propvalue1,propname2=propvalue2
+ *
+ * @param props
+ */
+ public void setProperties(String props) {
+ Map hashTable = new HashMap();
+ StringTokenizer pairs = new StringTokenizer(props, ",");
+ while (pairs.hasMoreTokens()) {
+ StringTokenizer entry = new StringTokenizer(pairs.nextToken(), "=");
+ hashTable.put(entry.nextElement().toString().trim(), entry.nextElement().toString().trim());
+ }
+ synchronized(this) {
+ properties = hashTable;
+ }
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public LoggingEvent rewrite(final LoggingEvent source) {
+ if (!properties.isEmpty()) {
+ Map rewriteProps = new HashMap(source.getProperties());
+ for(Iterator iter = properties.entrySet().iterator();
+ iter.hasNext();
+ ) {
+ Map.Entry entry = (Map.Entry) iter.next();
+ if (!rewriteProps.containsKey(entry.getKey())) {
+ rewriteProps.put(entry.getKey(), entry.getValue());
+ }
+ }
+
+ return new LoggingEvent(
+ source.getFQNOfLoggerClass(),
+ source.getLogger() != null ? source.getLogger(): Logger.getLogger(source.getLoggerName()),
+ source.getTimeStamp(),
+ source.getLevel(),
+ source.getMessage(),
+ source.getThreadName(),
+ source.getThrowableInformation(),
+ source.getNDC(),
+ source.getLocationInformation(),
+ rewriteProps);
+ }
+ return source;
+ }
+
+
+
+}