+/*
+ * 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.pattern;
+
+import org.apache.log4j.spi.LocationInfo;
+import org.apache.log4j.spi.LoggingEvent;
+
+
+/**
+ * Return the event's line location information in a StringBuffer.
+ *
+ * @author Ceki Gülcü
+ */
+public final class LineLocationPatternConverter
+ extends LoggingEventPatternConverter {
+ /**
+ * Singleton.
+ */
+ private static final LineLocationPatternConverter INSTANCE =
+ new LineLocationPatternConverter();
+
+ /**
+ * Private constructor.
+ */
+ private LineLocationPatternConverter() {
+ super("Line", "line");
+ }
+
+ /**
+ * Obtains an instance of pattern converter.
+ * @param options options, may be null.
+ * @return instance of pattern converter.
+ */
+ public static LineLocationPatternConverter newInstance(
+ final String[] options) {
+ return INSTANCE;
+ }
+
+ /**
+ * {@inheritDoc}
+ */
+ public void format(final LoggingEvent event, final StringBuffer output) {
+ LocationInfo locationInfo = event.getLocationInformation();
+
+ if (locationInfo != null) {
+ output.append(locationInfo.getLineNumber());
+ }
+ }
+}