001    /*
002     * Licensed to the Apache Software Foundation (ASF) under one or more
003     * contributor license agreements. See the NOTICE file distributed with
004     * this work for additional information regarding copyright ownership.
005     * The ASF licenses this file to You under the Apache license, Version 2.0
006     * (the "License"); you may not use this file except in compliance with
007     * the License. You may obtain a copy of the License at
008     *
009     *      http://www.apache.org/licenses/LICENSE-2.0
010     *
011     * Unless required by applicable law or agreed to in writing, software
012     * distributed under the License is distributed on an "AS IS" BASIS,
013     * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
014     * See the license for the specific language governing permissions and
015     * limitations under the license.
016     */
017    package org.apache.logging.log4j.core.layout;
018    
019    import java.nio.charset.Charset;
020    
021    import org.apache.logging.log4j.core.LogEvent;
022    import org.apache.logging.log4j.core.util.Charsets;
023    
024    /**
025     * Abstract base class for Layouts that result in a String.
026     */
027    public abstract class AbstractStringLayout extends AbstractLayout<String> {
028    
029        /**
030         * The charset for the formatted message.
031         */
032        private final Charset charset;
033    
034        protected AbstractStringLayout(final Charset charset, byte[] header, byte[] footer) {
035            super(header, footer);
036            this.charset = charset == null ? Charsets.UTF_8 : charset;
037        }
038    
039        protected AbstractStringLayout(final Charset charset) {
040            this(charset, null, null);
041        }
042    
043        /**
044         * Formats the Log Event as a byte array.
045         *
046         * @param event
047         *        The Log Event.
048         * @return The formatted event as a byte array.
049         */
050        @Override
051        public byte[] toByteArray(final LogEvent event) {
052            return toSerializable(event).getBytes(charset);
053        }
054    
055        /**
056         * @return The default content type for Strings.
057         */
058        @Override
059        public String getContentType() {
060            return "text/plain";
061        }
062    
063        protected Charset getCharset() {
064            return charset;
065        }
066    }