/*
    * 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.io.FilterOutputStream;
  import java.io.IOException;
  import java.io.OutputStream;
  import java.nio.charset.Charset;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.Marker;
  import org.apache.logging.log4j.spi.ExtendedLogger;
  
  /**
   * Logs each line written to a pre-defined level. Can also be configured with a Marker. This class provides an interface
   * that follows the {@link java.io.OutputStream} methods in spirit, but doesn't require output to any external stream.
   * This class should <em>not</em> be used as a stream for an underlying logger unless it's being used as a bridge.
   * Otherwise, infinite loops may occur!
   * 
   * @since 2.1
   */
  public class LoggerFilterOutputStream extends FilterOutputStream {
      private static final String FQCN = LoggerFilterOutputStream.class.getName();
  
      private final ByteStreamLogger logger;
      private final String fqcn;
  
      protected LoggerFilterOutputStream(final OutputStream out, final Charset charset, final ExtendedLogger logger,
                                         final String fqcn, final Level level, final Marker marker) {
          super(out);
          this.logger = new ByteStreamLogger(logger, level, marker, charset);
          this.fqcn = fqcn == null ? FQCN : fqcn;
      }
  
      @Override
      public void close() throws IOException {
          this.out.close();
          this.logger.close(this.fqcn);
      }
  
      @Override
      public void flush() throws IOException {
          this.out.flush();
      }
  
      @Override
      public String toString() {
          return LoggerFilterOutputStream.class.getSimpleName() + "{stream=" + this.out + '}';
      }
  
      @Override
      public void write(final byte[] b) throws IOException {
          this.out.write(b);
          this.logger.put(this.fqcn, b, 0, b.length);
      }
  
      @Override
      public void write(final byte[] b, final int off, final int len) throws IOException {
          this.out.write(b, off, len);
          this.logger.put(this.fqcn, b, off, len);
      }
  
      @Override
      public void write(final int b) throws IOException {
          this.out.write(b);
          this.logger.put(this.fqcn, (byte) (b & 0xFF));
      }
  }