/*
    * ====================================================================
    * 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.ByteArrayInputStream;
  import java.io.IOException;
  import java.io.InputStream;
  
  import org.apache.commons.logging.Log;
  import org.apache.http.annotation.Contract;
  import org.apache.http.annotation.ThreadingBehavior;
  import org.apache.http.util.Args;
  
  /**
   * Logs data to the wire LOG.
   * TODO: make package private. Should not be part of the public API.
   *
   * @since 4.0
   */
  @Contract(threading = ThreadingBehavior.IMMUTABLE)
  public class Wire {
  
      private final Log log;
      private final String id;
  
      /**
       * @since 4.3
       */
      public Wire(final Log log, final String id) {
          this.log = log;
          this.id = id;
      }
  
      public Wire(final Log log) {
          this(log, "");
      }
  
      private void wire(final String header, final InputStream inStream)
        throws IOException {
          final 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(id + " " + 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(id + " " + buffer.toString());
          }
      }
  
  
      public boolean enabled() {
          return log.isDebugEnabled();
      }
  
      public void output(final InputStream outStream)
        throws IOException {
          Args.notNull(outStream, "Output");
          wire(">> ", outStream);
     }
 
     public void input(final InputStream inStream)
       throws IOException {
         Args.notNull(inStream, "Input");
         wire("<< ", inStream);
     }
 
     public void output(final byte[] b, final int off, final int len)
       throws IOException {
         Args.notNull(b, "Output");
         wire(">> ", new ByteArrayInputStream(b, off, len));
     }
 
     public void input(final byte[] b, final int off, final int len)
       throws IOException {
         Args.notNull(b, "Input");
         wire("<< ", new ByteArrayInputStream(b, off, len));
     }
 
     public void output(final byte[] b)
       throws IOException {
         Args.notNull(b, "Output");
         wire(">> ", new ByteArrayInputStream(b));
     }
 
     public void input(final byte[] b)
       throws IOException {
         Args.notNull(b, "Input");
         wire("<< ", new ByteArrayInputStream(b));
     }
 
     public void output(final int b)
       throws IOException {
         output(new byte[] {(byte) b});
     }
 
     public void input(final int b)
       throws IOException {
         input(new byte[] {(byte) b});
     }
 
     public void output(final String s)
       throws IOException {
         Args.notNull(s, "Output");
         output(s.getBytes());
     }
 
     public void input(final String s)
       throws IOException {
         Args.notNull(s, "Input");
         input(s.getBytes());
     }
 }