/*
    * ====================================================================
    *
    *  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 java.io.InputStream;
  import java.io.ByteArrayInputStream;
  
  import org.apache.http.annotation.Immutable;
  
  import org.apache.commons.logging.Log;
  
  /**
   * Logs data to the wire LOG.
   *
   *
   * @since 4.0
   */
  @Immutable
  public class Wire {
  
      private final Log log;
  
      public Wire(Log log) {
          this.log = log;
      }
  
      private void wire(String header, InputStream instream)
        throws IOException {
          StringBuilder buffer = new StringBuilder();
          int ch;
          while ((ch = instream.read()) != -1) {
              if (ch == 13) {
                  buffer.append("[\\r]");
              } else if (ch == 10) {
                      buffer.append("[\\n]\"");
                      buffer.insert(0, "\"");
                      buffer.insert(0, header);
                      log.debug(buffer.toString());
                      buffer.setLength(0);
              } else if ((ch < 32) || (ch > 127)) {
                  buffer.append("[0x");
                  buffer.append(Integer.toHexString(ch));
                  buffer.append("]");
              } else {
                  buffer.append((char) ch);
              }
          }
          if (buffer.length() > 0) {
              buffer.append('\"');
              buffer.insert(0, '\"');
              buffer.insert(0, header);
              log.debug(buffer.toString());
          }
      }
  
  
      public boolean enabled() {
          return log.isDebugEnabled();
      }
  
      public void output(InputStream outstream)
        throws IOException {
          if (outstream == null) {
              throw new IllegalArgumentException("Output may not be null");
          }
          wire(">> ", outstream);
      }
  
      public void input(InputStream instream)
        throws IOException {
          if (instream == null) {
              throw new IllegalArgumentException("Input may not be null");
          }
          wire("<< ", instream);
     }
 
     public void output(byte[] b, int off, int len)
       throws IOException {
         if (b == null) {
             throw new IllegalArgumentException("Output may not be null");
         }
         wire(">> ", new ByteArrayInputStream(b, off, len));
     }
 
     public void input(byte[] b, int off, int len)
       throws IOException {
         if (b == null) {
             throw new IllegalArgumentException("Input may not be null");
         }
         wire("<< ", new ByteArrayInputStream(b, off, len));
     }
 
     public void output(byte[] b)
       throws IOException {
         if (b == null) {
             throw new IllegalArgumentException("Output may not be null");
         }
         wire(">> ", new ByteArrayInputStream(b));
     }
 
     public void input(byte[] b)
       throws IOException {
         if (b == null) {
             throw new IllegalArgumentException("Input may not be null");
         }
         wire("<< ", new ByteArrayInputStream(b));
     }
 
     public void output(int b)
       throws IOException {
         output(new byte[] {(byte) b});
     }
 
     public void input(int b)
       throws IOException {
         input(new byte[] {(byte) b});
     }
 
     /**
      * @deprecated (4.1)  do not use
      */
     @Deprecated 
     public void output(final String s)
       throws IOException {
         if (s == null) {
             throw new IllegalArgumentException("Output may not be null");
         }
         output(s.getBytes());
     }
 
     /**
      * @deprecated (4.1)  do not use
      */
     @Deprecated 
     public void input(final String s)
       throws IOException {
         if (s == null) {
             throw new IllegalArgumentException("Input may not be null");
         }
         input(s.getBytes());
     }
 }