/*
    * 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.logging.log4j.io;
  
  import java.nio.CharBuffer;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.Marker;
  import org.apache.logging.log4j.spi.ExtendedLogger;
  
  /**
   * 
   * @since 2.1
   */
  public class CharStreamLogger {
      private final ExtendedLogger logger;
      private final Level level;
      private final Marker marker;
      private final StringBuilder msg = new StringBuilder();
      private boolean closed = false;
  
      public CharStreamLogger(final ExtendedLogger logger, final Level level, final Marker marker) {
          this.logger = logger;
          this.level = level == null ? logger.getLevel() : level;
          this.marker = marker;
      }
  
      public void close(final String fqcn) {
          synchronized (this.msg) {
              this.closed = true;
              logEnd(fqcn);
          }
      }
  
      private void log(final String fqcn) {
          // convert to string now so async loggers work
          this.logger.logIfEnabled(fqcn, this.level, this.marker, this.msg.toString());
          this.msg.setLength(0);
      }
  
      private void logEnd(final String fqcn) {
          if (this.msg.length() > 0) {
              log(fqcn);
          }
      }
  
      public void put(final String fqcn, final char[] cbuf, final int off, final int len) {
          put(fqcn, CharBuffer.wrap(cbuf), off, len);
      }
  
      public void put(final String fqcn, final CharSequence str, final int off, final int len) {
          if (len >= 0) {
              synchronized (this.msg) {
                  if (this.closed) {
                      return;
                  }
                  int start = off;
                  final int end = off + len;
                  for (int pos = off; pos < end; pos++) {
                      final char c = str.charAt(pos);
                      switch (c) {
                      case '\r':
                      case '\n':
                          this.msg.append(str, start, pos);
                          start = pos + 1;
                          if (c == '\n') {
                              log(fqcn);
                          }
                          break;
                      }
                  }
                  this.msg.append(str, start, end);
              }
          } else {
              logEnd(fqcn);
          }
      }
  
      public void put(final String fqcn, final int c) {
          if (c >= 0) {
              synchronized (this.msg) {
                  if (this.closed) {
                      return;
                  }
                 switch (c) {
                 case '\n':
                     log(fqcn);
                     break;
                 case '\r':
                     break;
                 default:
                     this.msg.append((char) c);
                 }
             }
         } else {
             logEnd(fqcn);
         }
     }
 }