Source for java.util.jar.JarEntry

   1: /* JarEntry.java - Represents an entry in a jar file
   2:    Copyright (C) 2000, 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.util.jar;
  39: 
  40: import java.io.IOException;
  41: import java.security.cert.Certificate;
  42: import java.util.Set;
  43: import java.util.zip.ZipEntry;
  44: 
  45: /**
  46:  * Extension to a ZipEntry that contains manifest attributes and certificates.
  47:  * Both the Atrributes and the Certificates can be null when not set.
  48:  * Note that the <code>getCertificates()</code> method only returns a
  49:  * valid value after all of the data of the entry has been read.
  50:  * <p>
  51:  * There are no public methods to set the attributes or certificate of an
  52:  * Entru. Only JarEntries created by the classes in <code>java.util.jar</code>
  53:  * will have these properties set.
  54:  *
  55:  * @since 1.2
  56:  * @author Mark Wielaard (mark@klomp.org)
  57:  */
  58: 
  59: public class JarEntry extends ZipEntry
  60: {
  61:   // (Package local) fields
  62: 
  63:   Attributes attr;
  64:   JarFile jarfile;
  65: 
  66:   // Constructors
  67: 
  68:   /**
  69:    * Creates a new JarEntry with the specified name and no attributes or
  70:    * or certificates. Calls <code>super(name)</code> so all other (zip)entry
  71:    * fields are null or -1.
  72:    *
  73:    * @param name the name of the new jar entry
  74:    * @exception NullPointerException when the supplied name is null
  75:    * @exception IllegalArgumentException when the supplied name is longer
  76:    * than 65535 bytes
  77:    */
  78:   public JarEntry(String name) throws NullPointerException,
  79:     IllegalArgumentException
  80:   {
  81:     super(name);
  82:     attr = null;
  83:     jarfile = null;
  84:   }
  85: 
  86:   /**
  87:    * Creates a new JarEntry with the specified ZipEntry as template for
  88:    * all properties of the entry. Both attributes and certificates will be
  89:    * null.
  90:    *
  91:    * @param entry the ZipEntry whose fields should be copied
  92:    */
  93:   public JarEntry(ZipEntry entry)
  94:   {
  95:     super(entry);
  96:     attr = null;
  97:     jarfile = null;
  98:   }
  99: 
 100:   /**
 101:    * Creates a new JarEntry with the specified JarEntry as template for
 102:    * all properties of the entry.
 103:    *
 104:    * @param entry the jarEntry whose fields should be copied
 105:    */
 106:   public JarEntry(JarEntry entry)
 107:   {
 108:     super(entry);
 109:     try
 110:       {
 111:         attr = entry.getAttributes();
 112:       }
 113:     catch (IOException _)
 114:       {
 115:       }
 116:     jarfile = entry.jarfile;
 117:   }
 118: 
 119:   // Methods
 120: 
 121:   /**
 122:    * Returns a copy of the Attributes set for this entry.
 123:    * When no Attributes are set in the manifest null is returned.
 124:    *
 125:    * @return a copy of the Attributes set for this entry
 126:    * @exception IOException This will never be thrown. It is here for
 127:    * binary compatibility.
 128:    */
 129:   public Attributes getAttributes() throws IOException
 130:   {
 131:     if (attr != null)
 132:       {
 133:         return (Attributes) attr.clone();
 134:       }
 135:     else
 136:       {
 137:         return null;
 138:       }
 139:   }
 140: 
 141:   /**
 142:    * Returns a copy of the certificates set for this entry.
 143:    * When no certificates are set or when not all data of this entry has
 144:    * been read null is returned.
 145:    * <p>
 146:    * To make sure that this call returns a valid value you must read all
 147:    * data from the JarInputStream for this entry.
 148:    * When you don't need the data for an entry but want to know the
 149:    * certificates that are set for the entry then you can skip all data by
 150:    * calling <code>skip(entry.getSize())</code> on the JarInputStream for
 151:    * the entry.
 152:    *
 153:    * @return a copy of the certificates set for this entry
 154:    */
 155:   public Certificate[] getCertificates()
 156:   {
 157:     if (jarfile != null)
 158:       {
 159:         synchronized (jarfile)
 160:           {
 161:             if (jarfile.entryCerts != null)
 162:               {
 163:                 Set certs = (Set) jarfile.entryCerts.get(getName());
 164:                 if (certs != null
 165:                     && jarfile.verified.get(getName()) == Boolean.TRUE)
 166:                   return (Certificate[]) certs.toArray(new Certificate[certs.size()]);
 167:               }
 168:           }
 169:       }
 170:     return null;
 171:   }
 172: }