/*
    * ====================================================================
    * 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.nio.conn;
  
  import java.nio.ByteBuffer;
  
  import org.apache.commons.logging.Log;
  
  class Wire {
  
      private final Log log;
      private final String id;
  
      public Wire(final Log log, final String id) {
          super();
          this.log = log;
          this.id = id;
      }
  
      private void wire(final String header, final byte[] b, final int pos, final int off) {
          final StringBuilder buffer = new StringBuilder();
          for (int i = 0; i < off; i++) {
              final int ch = b[pos + i];
              if (ch == 13) {
                  buffer.append("[\\r]");
              } else if (ch == 10) {
                      buffer.append("[\\n]\"");
                      buffer.insert(0, "\"");
                      buffer.insert(0, header);
                      this.log.debug(this.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);
              this.log.debug(this.id + " " + buffer.toString());
          }
      }
  
  
      public boolean isEnabled() {
          return this.log.isDebugEnabled();
      }
  
      public void output(final byte[] b, final int pos, final int off) {
          wire(">> ", b, pos, off);
      }
  
      public void input(final byte[] b, final int pos, final int off) {
          wire("<< ", b, pos, off);
      }
  
      public void output(final byte[] b) {
          output(b, 0, b.length);
      }
  
      public void input(final byte[] b) {
          input(b, 0, b.length);
      }
  
      public void output(final int b) {
          output(new byte[] {(byte) b});
      }
  
      public void input(final int b) {
          input(new byte[] {(byte) b});
      }
 
     public void output(final ByteBuffer b) {
         if (b.hasArray()) {
             output(b.array(), b.arrayOffset() + b.position(), b.remaining());
         } else {
             final byte[] tmp = new byte[b.remaining()];
             b.get(tmp);
             output(tmp);
         }
     }
 
     public void input(final ByteBuffer b) {
         if (b.hasArray()) {
             input(b.array(), b.arrayOffset() + b.position(), b.remaining());
         } else {
             final byte[] tmp = new byte[b.remaining()];
             b.get(tmp);
             input(tmp);
         }
     }
 
 }