src/java/org/apache/log4j/pattern/MessagePatternConverter.java

/*
 * Copyright 1999,2004 The Apache Software Foundation.
 * 
 * Licensed 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.LoggingEvent;


/**
 * Return the event's rendered message in a StringBuffer.
 * 
 * @author Ceki Gülcü
 */
public class MessagePatternConverter extends PatternConverter {
  private static final int BUF_SIZE = 256;
  private static final int MAX_CAPACITY = 1024;

  // We assume that each PatternConveter instance is unique within a layout, 
  // which is unique within an appender. We further assume that callas to the 
  // appender method are serialized (per appender).
  StringBuffer buf;

  public MessagePatternConverter() {
    super();
    this.buf = new StringBuffer(BUF_SIZE);
  }

  public StringBuffer convert(LoggingEvent event) {
    // Reset working stringbuffer
    if (buf.capacity() > MAX_CAPACITY) {
      buf = new StringBuffer(BUF_SIZE);
    } else {
      buf.setLength(0);
    }

    buf.append(event.getRenderedMessage());

    return buf;
  }
  
  public String getName() {
      return "Message";
  }
  
  public String getStyleClass(LoggingEvent e) {
    return "message";
  }
}