Source for java.net.InetSocketAddress

   1: /* InetSocketAddress.java --
   2:    Copyright (C) 2002, 2006  Free Software Foundation, Inc.
   3: 
   4: This file is part of GNU Classpath.
   5: 
   6: GNU Classpath is free software; you can redistribute it and/or modify
   7: it under the terms of the GNU General Public License as published by
   8: the Free Software Foundation; either version 2, or (at your option)
   9: any later version.
  10: 
  11: GNU Classpath is distributed in the hope that it will be useful, but
  12: WITHOUT ANY WARRANTY; without even the implied warranty of
  13: MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  14: General Public License for more details.
  15: 
  16: You should have received a copy of the GNU General Public License
  17: along with GNU Classpath; see the file COPYING.  If not, write to the
  18: Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
  19: 02110-1301 USA.
  20: 
  21: Linking this library statically or dynamically with other modules is
  22: making a combined work based on this library.  Thus, the terms and
  23: conditions of the GNU General Public License cover the whole
  24: combination.
  25: 
  26: As a special exception, the copyright holders of this library give you
  27: permission to link this library with independent modules to produce an
  28: executable, regardless of the license terms of these independent
  29: modules, and to copy and distribute the resulting executable under
  30: terms of your choice, provided that you also meet, for each linked
  31: independent module, the terms and conditions of the license of that
  32: module.  An independent module is a module which is not derived from
  33: or based on this library.  If you modify this library, you may extend
  34: this exception to your version of the library, but you are not
  35: obligated to do so.  If you do not wish to do so, delete this
  36: exception statement from your version. */
  37: 
  38: package java.net;
  39: 
  40: 
  41: /**
  42:  * InetSocketAddress instances represent socket addresses
  43:  * in the java.nio package. They encapsulate a InetAddress and
  44:  * a port number.
  45:  *
  46:  * @since 1.4
  47:  */
  48: public class InetSocketAddress extends SocketAddress
  49: {
  50:   /**
  51:    * Compatible with JDK 1.4+
  52:    */
  53:   private static final long serialVersionUID = 5076001401234631237L;
  54: 
  55:   /**
  56:    * Name of host.
  57:    */
  58:   private String hostname;
  59: 
  60:   /**
  61:    * Address of host.
  62:    */
  63:   private InetAddress addr;
  64: 
  65:   /**
  66:    * Port of host.
  67:    */
  68:   private int port;
  69: 
  70:   /**
  71:    * Constructs an InetSocketAddress instance.
  72:    *
  73:    * @param addr Address of the socket
  74:    * @param port Port if the socket
  75:    *
  76:    * @exception IllegalArgumentException If the port number is illegel
  77:    */
  78:   public InetSocketAddress(InetAddress addr, int port)
  79:     throws IllegalArgumentException
  80:   {
  81:     if (port < 0 || port > 65535)
  82:       throw new IllegalArgumentException("Bad port number: " + port);
  83: 
  84:     if (addr == null)
  85:       addr = InetAddress.ANY_IF;
  86: 
  87:     this.addr = addr;
  88:     this.port = port;
  89:   }
  90: 
  91:   /**
  92:    * Constructs an InetSocketAddress instance.
  93:    *
  94:    * @param port Port if the socket
  95:    *
  96:    * @exception IllegalArgumentException If the port number is illegal
  97:    */
  98:   public InetSocketAddress(int port) throws IllegalArgumentException
  99:   {
 100:     this((InetAddress) null, port);
 101:   }
 102: 
 103:   /**
 104:    * Constructs an InetSocketAddress instance.
 105:    *
 106:    * @param hostname The hostname for the socket address
 107:    * @param port The port for the socket address
 108:    *
 109:    * @exception IllegalArgumentException If the port number is illegal or
 110:    * the hostname argument is null
 111:    */
 112:   public InetSocketAddress(String hostname, int port)
 113:   {
 114:     this(hostname, port, true);
 115:   }
 116: 
 117:   /**
 118:    * Constructs an InetSocketAddress instance.
 119:    *
 120:    * @param hostname The hostname for the socket address
 121:    * @param port The port for the socket address
 122:    * @param resolve <code>true</code> if the address has to be resolved,
 123:    * <code>false</code> otherwise
 124:    *
 125:    * @exception IllegalArgumentException If the port number is illegal or
 126:    * the hostname argument is null
 127:    */
 128:   private InetSocketAddress(String hostname, int port, boolean resolve)
 129:   {
 130:     if (hostname == null)
 131:       throw new IllegalArgumentException("Null host name value");
 132: 
 133:     if (port < 0 || port > 65535)
 134:       throw new IllegalArgumentException("Bad port number: " + port);
 135: 
 136:     this.port = port;
 137:     this.hostname = hostname;
 138:     this.addr = null;
 139: 
 140:     if (resolve)
 141:     {
 142:       try
 143:         {
 144:           this.addr = InetAddress.getByName(hostname);
 145:         }
 146:       catch (Exception e) // UnknownHostException, SecurityException
 147:         {
 148:           // Do nothing here. this.addr is already set to null.
 149:         }
 150:     }
 151: 
 152:   }
 153: 
 154:   /**
 155:    * Creates an unresolved <code>InetSocketAddress</code> object.
 156:    *
 157:    * @param hostname The hostname for the socket address
 158:    * @param port The port for the socket address
 159:    *
 160:    * @exception IllegalArgumentException If the port number is illegal or
 161:    * the hostname argument is null
 162:    *
 163:    * @since 1.5
 164:    */
 165:   public static InetSocketAddress createUnresolved(String hostname, int port)
 166:   {
 167:     return new InetSocketAddress(hostname, port, false);
 168:   }
 169: 
 170:   /**
 171:    * Test if obj is a <code>InetSocketAddress</code> and
 172:    * has the same address and port
 173:    *
 174:    * @param obj The obj to compare this address with.
 175:    *
 176:    * @return True if obj is equal.
 177:    */
 178:   public final boolean equals(Object obj)
 179:   {
 180:     // InetSocketAddress objects are equal when addr and port are equal.
 181:     // The hostname may differ.
 182:     if (obj instanceof InetSocketAddress)
 183:       {
 184:     InetSocketAddress sa = (InetSocketAddress) obj;
 185: 
 186:     if (addr == null && sa.addr != null)
 187:       return false;
 188:     else if (addr == null && sa.addr == null) // we know hostname != null
 189:       return hostname.equals(sa.hostname) && sa.port == port;
 190:     else
 191:       return addr.equals(sa.addr) && sa.port == port;
 192:       }
 193: 
 194:     return false;
 195:   }
 196: 
 197:   /**
 198:    * Returns the <code>InetAddress</code> or
 199:    * <code>null</code> if its unresolved
 200:    *
 201:    * @return The IP address of this address.
 202:    */
 203:   public final InetAddress getAddress()
 204:   {
 205:     return addr;
 206:   }
 207: 
 208:   /**
 209:    * Returns <code>hostname</code>
 210:    *
 211:    * @return The hostname of this address.
 212:    */
 213:   public final String getHostName()
 214:   {
 215:     if (hostname == null) // we know addr != null
 216:       hostname = addr.getHostName();
 217: 
 218:     return hostname;
 219:   }
 220: 
 221:   /**
 222:    * Returns the <code>port</code>
 223:    *
 224:    * @return The port of this address.
 225:    */
 226:   public final int getPort()
 227:   {
 228:     return port;
 229:   }
 230: 
 231:   /**
 232:    * Returns the hashcode of the <code>InetSocketAddress</code>
 233:    *
 234:    * @return The hashcode for this address.
 235:    */
 236:   public final int hashCode()
 237:   {
 238:     return port + addr.hashCode();
 239:   }
 240: 
 241:   /**
 242:    * Checks wether the address has been resolved or not
 243:    *
 244:    * @return True if address is unresolved.
 245:    */
 246:   public final boolean isUnresolved()
 247:   {
 248:     return addr == null;
 249:   }
 250: 
 251:   /**
 252:    * Returns the <code>InetSocketAddress</code> as string
 253:    *
 254:    * @return A string representation of this address.
 255:    */
 256:   public String toString()
 257:   {
 258:     // Note: if addr is null, then hostname != null.
 259:     return (addr == null ? hostname : addr.toString()) + ":" + port;
 260:   }
 261: }