libjava/classpath/javax/xml/namespace/QName.java

   1 /* QName.java - An XML qualified name.
   2    Copyright (C) 2004,2005,2006 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
  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       namespaceURI = XMLConstants.NULL_NS_URI;
  71     if (localPart == null)
  72       throw new IllegalArgumentException();
  73     if (prefix == null)
  74       prefix = XMLConstants.DEFAULT_NS_PREFIX;
  75     else
  76       {
  77         if (XMLConstants.XML_NS_PREFIX.equals(prefix))
  78           namespaceURI = XMLConstants.XML_NS_URI;
  79         else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix))
  80           namespaceURI = XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
  81       }
  82     this.namespaceURI = namespaceURI;
  83     this.localPart = localPart;
  84     this.prefix = prefix;
  85   }
  86
  87   public QName(String localPart)
  88   {
  89     this(null, localPart, null);
  90   }
  91
  92   public String getNamespaceURI()
  93   {
  94     return namespaceURI;
  95   }
  96
  97   public String getLocalPart()
  98   {
  99     return localPart;
 100   }
 101
 102   public String getPrefix()
 103   {
 104     return prefix;
 105   }
 106
 107   public final boolean equals(Object obj)
 108   {
 109     if (obj instanceof QName)
 110       {
 111         QName qname = (QName) obj;
 112         return qname.getLocalPart().equals(localPart) &&
 113           qname.getNamespaceURI().equals(namespaceURI);
 114       }
 115     return false;
 116   }
 117
 118   public final int hashCode()
 119   {
 120     if (hashCode == -1)
 121       hashCode = localPart.hashCode() ^ namespaceURI.hashCode();
 122     return hashCode;
 123   }
 124
 125   public synchronized String toString()
 126   {
 127     if (qName == null)
 128       {
 129         StringBuffer buf = new StringBuffer();
 130         if (namespaceURI.length() > 0)
 131           {
 132             buf.append('{');
 133             buf.append(namespaceURI);
 134             buf.append('}');
 135           }
 136         if (prefix.length() > 0)
 137           {
 138             buf.append(prefix);
 139             buf.append(':');
 140           }
 141         buf.append(localPart);
 142         qName = buf.toString();
 143       }
 144     return qName;
 145   }
 146
 147   public static QName valueOf(String qNameAsString)
 148   {
 149     String namespaceUri = "", prefix = null;
 150     int start = qNameAsString.indexOf('{');
 151     int end = qNameAsString.indexOf('}');
 152     if (start != -1)
 153       {
 154         if (end < start)
 155           throw new IllegalArgumentException(qNameAsString);
 156         namespaceUri = qNameAsString.substring(start + 1, end);
 157         qNameAsString = qNameAsString.substring(end + 1);
 158       }
 159     start = qNameAsString.indexOf(':');
 160     if (start != -1)
 161       {
 162         prefix = qNameAsString.substring(0, start);
 163         qNameAsString = qNameAsString.substring(start + 1);
 164       }
 165     return new QName(namespaceUri, qNameAsString, prefix);
 166   }
 167
 168 }