old-autovect-branch/libjava/classpath/javax/xml/namespace/QName.java

   1 /* QName.java - An XML qualified name.
   2    Copyright (C) 2004, 2005 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
  39 package javax.xml.namespace;
  40
  41 import java.io.Serializable;
  42
  43 import javax.xml.XMLConstants;
  44
  45 /**
  46  * An XML
  47  * <a href='http://www.w3.org/TR/REC-xml-names/#ns-qualnames'>qualified name</a>.
  48  *
  49  * @author <a href='mailto:dog@gnu.org'>Chris Burdess</a>
  50  * @since 1.3
  51  */
  52 public class QName implements Serializable
  53 {
  54   private static final long serialVersionUID = 4418622981026545151L;
  55
  56   private final String namespaceURI;
  57   private final String localPart;
  58   private final String prefix;
  59   private transient String qName;
  60   transient int hashCode = -1;
  61
  62   public QName(String namespaceURI, String localPart)
  63   {
  64     this(namespaceURI, localPart, null);
  65   }
  66
  67   public QName(String namespaceURI, String localPart, String prefix)
  68   {
  69     if (namespaceURI == null)
  70       {
  71         namespaceURI = XMLConstants.NULL_NS_URI;
  72       }
  73     if (localPart == null)
  74       {
  75         throw new IllegalArgumentException();
  76       }
  77     if (prefix == null)
  78       {
  79         prefix = XMLConstants.DEFAULT_NS_PREFIX;
  80       }
  81     this.namespaceURI = namespaceURI;
  82     this.localPart = localPart;
  83     this.prefix = prefix;
  84   }
  85
  86   public QName(String localPart)
  87   {
  88     this(null, localPart, null);
  89   }
  90
  91   public String getNamespaceURI()
  92   {
  93     return namespaceURI;
  94   }
  95
  96   public String getLocalPart()
  97   {
  98     return localPart;
  99   }
 100
 101   public String getPrefix()
 102   {
 103     return prefix;
 104   }
 105
 106   public final boolean equals(Object obj)
 107   {
 108     if (obj instanceof QName)
 109       {
 110         QName qname = (QName) obj;
 111         return qname.getLocalPart().equals(localPart) &&
 112           qname.getNamespaceURI().equals(namespaceURI);
 113       }
 114     return false;
 115   }
 116
 117   public final int hashCode()
 118   {
 119     if (hashCode == -1)
 120       hashCode = localPart.hashCode() ^ namespaceURI.hashCode();
 121     return hashCode;
 122   }
 123
 124   public synchronized String toString()
 125   {
 126     if (qName == null)
 127       {
 128         StringBuffer buf = new StringBuffer();
 129         if (namespaceURI.length() > 0)
 130           {
 131             buf.append('{');
 132             buf.append(namespaceURI);
 133             buf.append('}');
 134           }
 135         if (prefix.length() > 0)
 136           {
 137             buf.append(prefix);
 138             buf.append(':');
 139           }
 140         buf.append(localPart);
 141         qName = buf.toString();
 142       }
 143     return qName;
 144   }
 145
 146   public static QName valueOf(String qNameAsString)
 147   {
 148     String namespaceUri = "", prefix = null;
 149     int start = qNameAsString.indexOf('{');
 150     int end = qNameAsString.indexOf('}');
 151     if (start != -1)
 152       {
 153         if (end < start)
 154           {
 155             throw new IllegalArgumentException(qNameAsString);
 156           }
 157         namespaceUri = qNameAsString.substring(start + 1, end);
 158         qNameAsString = qNameAsString.substring(end + 1);
 159       }
 160     start = qNameAsString.indexOf(':');
 161     if (start != -1)
 162       {
 163         prefix = qNameAsString.substring(0, start);
 164         qNameAsString = qNameAsString.substring(start + 1);
 165       }
 166     return new QName(namespaceUri, qNameAsString, prefix);
 167   }
 168
 169 }