/*
    * 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.FilterReader;
  import java.io.IOException;
  import java.io.Reader;
  import java.nio.CharBuffer;
  
  import org.apache.logging.log4j.Level;
  import org.apache.logging.log4j.Marker;
  import org.apache.logging.log4j.spi.ExtendedLogger;
  
  /**
   * Logs each line read to a pre-defined level. Can also be configured with a Marker.
   * 
   * @since 2.1
   */
  public class LoggerReader extends FilterReader {
      private static final String FQCN = LoggerReader.class.getName();
  
      private final CharStreamLogger logger;
      private final String fqcn;
  
      protected LoggerReader(final Reader reader, final ExtendedLogger logger, final String fqcn, final Level level,
                             final Marker marker) {
          super(reader);
          this.logger = new CharStreamLogger(logger, level, marker);
          this.fqcn = fqcn == null ? FQCN : fqcn;
      }
  
      @Override
      public void close() throws IOException {
          super.close();
          this.logger.close(this.fqcn);
      }
  
      @Override
      public int read() throws IOException {
          final int c = super.read();
          this.logger.put(this.fqcn, c);
          return c;
      }
  
      @Override
      public int read(final char[] cbuf) throws IOException {
          return read(cbuf, 0, cbuf.length);
      }
  
      @Override
      public int read(final char[] cbuf, final int off, final int len) throws IOException {
          final int charsRead = super.read(cbuf, off, len);
          this.logger.put(this.fqcn, cbuf, off, charsRead);
          return charsRead;
      }
  
      @Override
      public int read(final CharBuffer target) throws IOException {
          final int len = target.remaining();
          final char[] cbuf = new char[len];
          final int charsRead = read(cbuf, 0, len);
          if (charsRead > 0) {
              target.put(cbuf, 0, charsRead);
          }
          return charsRead;
      }
  
      @Override
      public String toString() {
          return LoggerReader.class.getSimpleName() + "{stream=" + this.in + '}';
      }
  }