1 /* JarEntry.java - Represents an entry in a jar file 2 Copyright (C) 2000 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., 59 Temple Place, Suite 330, Boston, MA 19 02111-1307 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.zip.ZipEntry; 43 44 /** 45 * Extension to a ZipEntry that contains manifest attributes and certificates. 46 * Both the Atrributes and the Certificates can be null when not set. 47 * Note that the <code>getCertificates()</code> method only returns a 48 * valid value after all of the data of the entry has been read. 49 * <p> 50 * There are no public methods to set the attributes or certificate of an 51 * Entru. Only JarEntries created by the classes in <code>java.util.jar</code> 52 * will have these properties set. 53 * 54 * @since 1.2 55 * @author Mark Wielaard (mark@klomp.org) 56 */ 57 58 public class JarEntry extends ZipEntry 59 { 60 // (Package local) fields 61 62 Attributes attr; 63 Certificate certs[]; 64 65 // Constructors 66 67 /** 68 * Creates a new JarEntry with the specified name and no attributes or 69 * or certificates. Calls <code>super(name)</code> so all other (zip)entry 70 * fields are null or -1. 71 * 72 * @param name the name of the new jar entry 73 * @exception NullPointerException when the supplied name is null 74 * @exception IllegalArgumentException when the supplied name is longer 75 * than 65535 bytes 76 */ JarEntry(String name)77 public JarEntry(String name) throws NullPointerException, 78 IllegalArgumentException 79 { 80 super(name); 81 attr = null; 82 certs = null; 83 } 84 85 /** 86 * Creates a new JarEntry with the specified ZipEntry as template for 87 * all properties of the entry. Both attributes and certificates will be 88 * null. 89 * 90 * @param entry the ZipEntry whose fields should be copied 91 */ JarEntry(ZipEntry entry)92 public JarEntry(ZipEntry entry) 93 { 94 super(entry); 95 attr = null; 96 certs = null; 97 } 98 99 /** 100 * Creates a new JarEntry with the specified JarEntry as template for 101 * all properties of the entry. 102 * 103 * @param entry the jarEntry whose fields should be copied 104 */ JarEntry(JarEntry entry)105 public JarEntry(JarEntry entry) 106 { 107 super(entry); 108 try 109 { 110 attr = entry.getAttributes(); 111 } 112 catch (IOException _) 113 { 114 } 115 certs = entry.getCertificates(); 116 } 117 118 // Methods 119 120 /** 121 * Returns a copy of the Attributes set for this entry. 122 * When no Attributes are set in the manifest null is returned. 123 * 124 * @return a copy of the Attributes set for this entry 125 * @exception IOException This will never be thrown. It is here for 126 * binary compatibility. 127 */ getAttributes()128 public Attributes getAttributes() throws IOException 129 { 130 if (attr != null) 131 { 132 return (Attributes) attr.clone(); 133 } 134 else 135 { 136 return null; 137 } 138 } 139 140 /** 141 * Returns a copy of the certificates set for this entry. 142 * When no certificates are set or when not all data of this entry has 143 * been read null is returned. 144 * <p> 145 * To make sure that this call returns a valid value you must read all 146 * data from the JarInputStream for this entry. 147 * When you don't need the data for an entry but want to know the 148 * certificates that are set for the entry then you can skip all data by 149 * calling <code>skip(entry.getSize())</code> on the JarInputStream for 150 * the entry. 151 * 152 * @return a copy of the certificates set for this entry 153 */ getCertificates()154 public Certificate[] getCertificates() 155 { 156 if (certs != null) 157 { 158 return (Certificate[])certs.clone(); 159 } 160 else 161 { 162 return null; 163 } 164 } 165 } 166