001 /* JarEntry.java - Represents an entry in a jar file
002 Copyright (C) 2000, 2006 Free Software Foundation, Inc.
003
004 This file is part of GNU Classpath.
005
006 GNU Classpath is free software; you can redistribute it and/or modify
007 it under the terms of the GNU General Public License as published by
008 the Free Software Foundation; either version 2, or (at your option)
009 any later version.
010
011 GNU Classpath is distributed in the hope that it will be useful, but
012 WITHOUT ANY WARRANTY; without even the implied warranty of
013 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
014 General Public License for more details.
015
016 You should have received a copy of the GNU General Public License
017 along with GNU Classpath; see the file COPYING. If not, write to the
018 Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
019 02110-1301 USA.
020
021 Linking this library statically or dynamically with other modules is
022 making a combined work based on this library. Thus, the terms and
023 conditions of the GNU General Public License cover the whole
024 combination.
025
026 As a special exception, the copyright holders of this library give you
027 permission to link this library with independent modules to produce an
028 executable, regardless of the license terms of these independent
029 modules, and to copy and distribute the resulting executable under
030 terms of your choice, provided that you also meet, for each linked
031 independent module, the terms and conditions of the license of that
032 module. An independent module is a module which is not derived from
033 or based on this library. If you modify this library, you may extend
034 this exception to your version of the library, but you are not
035 obligated to do so. If you do not wish to do so, delete this
036 exception statement from your version. */
037
038 package java.util.jar;
039
040 import java.io.IOException;
041 import java.security.cert.Certificate;
042 import java.util.Set;
043 import java.util.zip.ZipEntry;
044
045 /**
046 * Extension to a ZipEntry that contains manifest attributes and certificates.
047 * Both the Atrributes and the Certificates can be null when not set.
048 * Note that the <code>getCertificates()</code> method only returns a
049 * valid value after all of the data of the entry has been read.
050 * <p>
051 * There are no public methods to set the attributes or certificate of an
052 * Entru. Only JarEntries created by the classes in <code>java.util.jar</code>
053 * will have these properties set.
054 *
055 * @since 1.2
056 * @author Mark Wielaard (mark@klomp.org)
057 */
058
059 public class JarEntry extends ZipEntry
060 {
061 // (Package local) fields
062
063 Attributes attr;
064 JarFile jarfile;
065
066 // Constructors
067
068 /**
069 * Creates a new JarEntry with the specified name and no attributes or
070 * or certificates. Calls <code>super(name)</code> so all other (zip)entry
071 * fields are null or -1.
072 *
073 * @param name the name of the new jar entry
074 * @exception NullPointerException when the supplied name is null
075 * @exception IllegalArgumentException when the supplied name is longer
076 * than 65535 bytes
077 */
078 public JarEntry(String name) throws NullPointerException,
079 IllegalArgumentException
080 {
081 super(name);
082 attr = null;
083 jarfile = null;
084 }
085
086 /**
087 * Creates a new JarEntry with the specified ZipEntry as template for
088 * all properties of the entry. Both attributes and certificates will be
089 * null.
090 *
091 * @param entry the ZipEntry whose fields should be copied
092 */
093 public JarEntry(ZipEntry entry)
094 {
095 super(entry);
096 attr = null;
097 jarfile = null;
098 }
099
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 }