001/* JarEntry.java - Represents an entry in a jar file 002 Copyright (C) 2000, 2006 Free Software Foundation, Inc. 003 004This file is part of GNU Classpath. 005 006GNU Classpath is free software; you can redistribute it and/or modify 007it under the terms of the GNU General Public License as published by 008the Free Software Foundation; either version 2, or (at your option) 009any later version. 010 011GNU Classpath is distributed in the hope that it will be useful, but 012WITHOUT ANY WARRANTY; without even the implied warranty of 013MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 014General Public License for more details. 015 016You should have received a copy of the GNU General Public License 017along with GNU Classpath; see the file COPYING. If not, write to the 018Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 01902110-1301 USA. 020 021Linking this library statically or dynamically with other modules is 022making a combined work based on this library. Thus, the terms and 023conditions of the GNU General Public License cover the whole 024combination. 025 026As a special exception, the copyright holders of this library give you 027permission to link this library with independent modules to produce an 028executable, regardless of the license terms of these independent 029modules, and to copy and distribute the resulting executable under 030terms of your choice, provided that you also meet, for each linked 031independent module, the terms and conditions of the license of that 032module. An independent module is a module which is not derived from 033or based on this library. If you modify this library, you may extend 034this exception to your version of the library, but you are not 035obligated to do so. If you do not wish to do so, delete this 036exception statement from your version. */ 037 038package java.util.jar; 039 040import java.io.IOException; 041import java.security.cert.Certificate; 042import java.util.Set; 043import 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 059public 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}