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Re: using TreeMap how to return the Object ?

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On 06/27/2013 11:19 AM, Jeff Higgins wrote:
> On 06/27/2013 01:30 AM, moonhkt wrote:

>>     public void process_hosts () {
>>        File ihost = new File(ifn);
>>        String delimscfg = "\\s+";  /** multi-space */
>>        String aline ;
>>        int i  = 0 ;
>>        try {
>>           BufferedReader br1 = new BufferedReader(new FileReader(ihost));
>>            while ((aline = br1.readLine()) != null) {
>>              String [] tokens = aline.split(delimscfg);
>>              try {
>>                  if ( ! tokens[0].trim().startsWith("#")) {
>>                     /*  System.out.print("-->");
>>                      System.out.print(tokens[0].trim());
>>                      System.out.print(" ");
>>                      System.out.print(tokens[0].trim().substring(0));
>>                      System.out.println("<--"); */
>
> You'll want a (probably immutable) java.util.Comparable key,
> or a java.util.Comparator for your key in a java.util.SortedMap.
>
> Why store your key with your value?
>
>>                      ipx.put(tokens[0].trim(),new
>> eleHost(tokens[1].trim(),"x"));
>>                   }
>>              } catch (ArrayIndexOutOfBoundsException e) {
>>                  continue;
>>              }
>>            }
>>         } catch (IOException e) {
>>            System.out.println(e);
>>        }
>>     }

import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.util.Arrays;

import sun.net.util.IPAddressUtil;

/**
  * <p>This class represents an Internet Protocol Version 6 (IPv6) 
address.</p>
  * <p>An instance of an IPv6Address consists of an raw IPv6 address
  * (a sixteen element byte array) and has no knowledge of the internal
  * (IPv6) structure of the raw IPv6 address.</p>
  * <p>This class is intended to demonstrate concepts discussed in a 
usenet posting.</p>
  * <p><strong>FOR TESTING PURPOSES ONLY -- NOT FOR PRODUCTION 
USE</strong></p>
  * @author jeff
  *
  */
public final class IPv6Address implements Comparable<IPv6Address> {

   /**
    * <p>Creates an IPv6Address based on the provided IPv6 raw address.</p>
    * <p>If address is null, or other than sixteen bytes in length,
    * the IPv6 unspecified address is returned.</p>
    * <p>Possible to introduce an IPv6 mapped or compatible IPv4 address 
here.</p>
    *
    * @param address a sixteen element byte array (raw IPv6 address)
    * @return an IPv6Address object created from the raw IP address,
    * or the IPv6 unspecified address if address is null or other than 
sixteen bytes in length
    */
   public static IPv6Address valueOf(byte[] address) {
     return new IPv6Address(address);
   }

   /**
    * <p>Creates an IPv6Address based on the provided IPv6 address 
textual representation.</p>
    * <p>If address is null, or otherwise invalid,
    * the IPv6 unspecified address is returned.</p>
    * <p>IPv6 mapped or compatible IPv4 address are considered invalid 
here.</p>
    *
    * @param text representation of an IPv6 address
    * @return an IPv6Address object created from the IPv6 address text,
    * or the IPv6 unspecified address if address is null or invalid per
    * sun.net.util.IPAddressUtil.textToNumericFormatV6(address)
    */
   public static IPv6Address valueOf(String address) {
     return new IPv6Address(address);
   }

   /**
    * The IPv6 raw address stored by this class is in network byte order,
    * the MSB is at index 0 and the LSB is at index 15.</p>
    *
    * @see java.lang.Comparable#compareTo(java.lang.Object)
    */
   @Override
   public int compareTo(IPv6Address address) {
     int comparison = 0;
     for (int i = 0; i < bytes.length; i++) {
       comparison = Byte.compare(bytes[i], address.bytes[i]);
       if (comparison != 0)
         break;
     }
     return comparison;
   }

   /*
    * (non-Javadoc)
    *
    * IDE generated equals method
    *
    * @see java.lang.Object#equals(java.lang.Object)
    */
   @Override
   public boolean equals(Object obj) {
     if (this == obj)
       return true;
     if (obj == null)
       return false;
     if (getClass() != obj.getClass())
       return false;
     IPv6Address other = (IPv6Address) obj;
     if (!Arrays.equals(bytes, other.bytes))
       return false;
     return true;
   }

   /*
    * (non-Javadoc)
    *
    * IDE generated hashCode method
    *
    * @see java.lang.Object#hashCode()
    */
   @Override
   public int hashCode() {
     final int prime = 31;
     int result = 1;
     result = prime * result + Arrays.hashCode(bytes);
     return result;
   }

   /**
    * <p>Converts this IP address to a String. The string returned
    * is of the IPv6 "preferred" form:</p>
    * <p>RFC2373 Section 2.2 Text Representation of Addresses
    * <p>1. The preferred form is x:x:x:x:x:x:x:x, where the 'x's are the
    * hexadecimal values of the eight 16-bit pieces of the address.
    * <br>Examples:</p>
    * <pre>
          FEDC:BA98:7654:3210:FEDC:BA98:7654:3210

          1080:0:0:0:8:800:200C:417A
    * </pre>
    *
    * @return a string representation of this IP address
    * @see java.lang.Object#toString()
    */
   @Override
   public String toString() {

     StringBuilder builder = new StringBuilder();
     CharBuffer buffer = ByteBuffer.wrap(bytes).asCharBuffer();
     while (buffer.hasRemaining()) {
       builder.append(Integer.toHexString(buffer.get()));
       if (buffer.hasRemaining())
         builder.append(":");
     }
     return builder.toString();
   }

   private final byte[] bytes;

   private IPv6Address(byte[] address) {
     bytes = new byte[16];
     if (address != null && address.length == 16)
       System.arraycopy(address, 0, bytes, 0, 16);
   }

   private IPv6Address(String address) {
     @SuppressWarnings("restriction")
     byte[] test = IPAddressUtil.textToNumericFormatV6(address);
     bytes = new byte[16];
     if (test != null && test.length == 16) {
       System.arraycopy(test, 0, bytes, 0, 16);
     }
   }
}

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Thread

using TreeMap how to return the Object ? moonhkt <moonhkt@gmail.com> - 2013-06-26 22:30 -0700
  Re: using TreeMap how to return the Object ? Jeff Higgins <jeff@invalid.invalid> - 2013-06-27 11:19 -0400
    Re: using TreeMap how to return the Object ? Jeff Higgins <jeff@invalid.invalid> - 2013-06-27 13:15 -0400
    Re: using TreeMap how to return the Object ? Jeff Higgins <jeff@invalid.invalid> - 2013-07-01 10:49 -0400
  Re: using TreeMap how to return the Object ? Lew <lewbloch@gmail.com> - 2013-06-28 10:42 -0700
    Re: using TreeMap how to return the Object ? Patricia Shanahan <pats@acm.org> - 2013-06-28 19:13 -0700
      Re: using TreeMap how to return the Object ? Gene Wirchenko <genew@telus.net> - 2013-07-01 14:16 -0700

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