/*
    * ====================================================================
    * 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.
   * ====================================================================
   *
   * This software consists of voluntary contributions made by many
   * individuals on behalf of the Apache Software Foundation.  For more
   * information on the Apache Software Foundation, please see
   * <http://www.apache.org/>.
   *
   */
  package org.apache.http.impl.conn;
  
  import java.io.IOException;
  
  import org.apache.http.Consts;
  import org.apache.http.annotation.Immutable;
  import org.apache.http.io.HttpTransportMetrics;
  import org.apache.http.io.SessionOutputBuffer;
  import org.apache.http.util.CharArrayBuffer;
  
  /**
   * Logs all data written to the wire LOG.
   *
   *
   * @since 4.0
   */
  @Immutable
  public class LoggingSessionOutputBuffer implements SessionOutputBuffer {
  
      /** Original data transmitter. */
      private final SessionOutputBuffer out;
  
      /** The wire log to use. */
      private final Wire wire;
  
      private final String charset;
  
      /**
       * Create an instance that wraps the specified session output buffer.
       * @param out The session output buffer.
       * @param wire The Wire log to use.
       * @param charset protocol charset, <code>ASCII</code> if <code>null</code>
       */
      public LoggingSessionOutputBuffer(
              final SessionOutputBuffer out, final Wire wire, final String charset) {
          super();
          this.out = out;
          this.wire = wire;
          this.charset = charset != null ? charset : Consts.ASCII.name();
      }
  
      public LoggingSessionOutputBuffer(final SessionOutputBuffer out, final Wire wire) {
          this(out, wire, null);
      }
  
      public void write(final byte[] b, final int off, final int len) throws IOException {
          this.out.write(b,  off,  len);
          if (this.wire.enabled()) {
              this.wire.output(b, off, len);
          }
      }
  
      public void write(final int b) throws IOException {
          this.out.write(b);
          if (this.wire.enabled()) {
              this.wire.output(b);
          }
      }
  
      public void write(final byte[] b) throws IOException {
          this.out.write(b);
          if (this.wire.enabled()) {
              this.wire.output(b);
          }
      }
  
      public void flush() throws IOException {
          this.out.flush();
      }
  
      public void writeLine(final CharArrayBuffer buffer) throws IOException {
          this.out.writeLine(buffer);
          if (this.wire.enabled()) {
             final String s = new String(buffer.buffer(), 0, buffer.length());
             final String tmp = s + "\r\n";
             this.wire.output(tmp.getBytes(this.charset));
         }
     }
 
     public void writeLine(final String s) throws IOException {
         this.out.writeLine(s);
         if (this.wire.enabled()) {
             final String tmp = s + "\r\n";
             this.wire.output(tmp.getBytes(this.charset));
         }
     }
 
     public HttpTransportMetrics getMetrics() {
         return this.out.getMetrics();
     }
 
 }