| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.io.JarDBFile |
| 4 | |
| 5 | Copyright 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.impl.io; |
| 22 | |
| 23 | import org.apache.derby.io.StorageFile; |
| 24 | import org.apache.derby.io.StorageRandomAccessFile; |
| 25 | |
| 26 | import org.apache.derby.iapi.services.sanity.SanityManager; |
| 27 | |
| 28 | import java.io.File; |
| 29 | import java.io.InputStream; |
| 30 | import java.io.OutputStream; |
| 31 | import java.io.IOException; |
| 32 | import java.io.FileNotFoundException; |
| 33 | import java.net.MalformedURLException; |
| 34 | import java.net.URL; |
| 35 | import java.util.zip.ZipEntry; |
| 36 | import java.util.zip.ZipFile; |
| 37 | |
| 38 | |
| 39 | /** |
| 40 | * This class provides a jar file based implementation of the StorageFile interface. It is used by the |
| 41 | * database engine to access persistent data and transaction logs under the jar subsubprotocol. |
| 42 | */ |
| 43 | class JarDBFile extends InputStreamFile |
| 44 | { |
| 45 | |
| 46 | private final JarStorageFactory storageFactory; |
| 47 | |
| 48 | JarDBFile( JarStorageFactory storageFactory, String path) |
| 49 | { |
| 50 | super( storageFactory, path); |
| 51 | this.storageFactory = storageFactory; |
| 52 | } |
| 53 | |
| 54 | JarDBFile( JarStorageFactory storageFactory, String parent, String name) |
| 55 | { |
| 56 | super( storageFactory, parent, name); |
| 57 | this.storageFactory = storageFactory; |
| 58 | } |
| 59 | |
| 60 | JarDBFile( JarDBFile dir, String name) |
| 61 | { |
| 62 | super( dir,name); |
| 63 | this.storageFactory = dir.storageFactory; |
| 64 | } |
| 65 | |
| 66 | private JarDBFile( JarStorageFactory storageFactory, String child, int pathLen) |
| 67 | { |
| 68 | super( storageFactory, child, pathLen); |
| 69 | this.storageFactory = storageFactory; |
| 70 | } |
| 71 | |
| 72 | /** |
| 73 | * Tests whether the named file exists. |
| 74 | * |
| 75 | * @return <b>true</b> if the named file exists, <b>false</b> if not. |
| 76 | */ |
| 77 | public boolean exists() |
| 78 | { |
| 79 | return getEntry() != null; |
| 80 | } // end of exists |
| 81 | |
| 82 | private ZipEntry getEntry() |
| 83 | { |
| 84 | return storageFactory.zipData.getEntry( path); |
| 85 | } |
| 86 | |
| 87 | /** |
| 88 | * Returns the length of the named file if it is not a directory. The return value is not specified |
| 89 | * if the file is a directory. |
| 90 | * |
| 91 | * @return The length, in bytes, of the named file if it exists and is not a directory, |
| 92 | * 0 if the file does not exist, or any value if the named file is a directory. |
| 93 | */ |
| 94 | public long length() |
| 95 | { |
| 96 | ZipEntry entry = getEntry(); |
| 97 | if( entry == null) |
| 98 | return 0; |
| 99 | return entry.getSize(); |
| 100 | } // end of length |
| 101 | |
| 102 | /** |
| 103 | * Get the name of the parent directory if this name includes a parent. |
| 104 | * |
| 105 | * @return An StorageFile denoting the parent directory of this StorageFile, if it has a parent, null if |
| 106 | * it does not have a parent. |
| 107 | */ |
| 108 | StorageFile getParentDir( int pathLen) |
| 109 | { |
| 110 | return new JarDBFile( storageFactory, path, pathLen); |
| 111 | } |
| 112 | |
| 113 | /** |
| 114 | * Creates an input stream from a file name. |
| 115 | * |
| 116 | * @return an input stream suitable for reading from the file. |
| 117 | * |
| 118 | * @exception FileNotFoundException if the file is not found. |
| 119 | */ |
| 120 | public InputStream getInputStream( ) throws FileNotFoundException |
| 121 | { |
| 122 | ZipEntry zipEntry = getEntry( ); |
| 123 | if (zipEntry == null) |
| 124 | throw new java.io.FileNotFoundException(path); |
| 125 | |
| 126 | try |
| 127 | { |
| 128 | return storageFactory.zipData.getInputStream(zipEntry); |
| 129 | } |
| 130 | catch( IOException ioe){ throw new java.io.FileNotFoundException(path);} |
| 131 | } // end of getInputStream |
| 132 | |
| 133 | /** |
| 134 | * Get the file name for diagnostic purposes. Usually the same as getPath(). |
| 135 | * |
| 136 | * @return the file name |
| 137 | */ |
| 138 | public String toString() |
| 139 | { |
| 140 | return path; |
| 141 | } |
| 142 | /** |
| 143 | * Return a URL for this file (resource). Returns a URL according to the |
| 144 | * spec for java.net.JarURLConnection |
| 145 | * |
| 146 | * @see org.apache.derby.io.StorageFile#getURL() |
| 147 | */ |
| 148 | public URL getURL() throws MalformedURLException { |
| 149 | File pathFile = new File(storageFactory.zipData.getName()); |
| 150 | |
| 151 | String pathFileURL = pathFile.toURL().toString(); |
| 152 | |
| 153 | return new URL("jar:" + pathFileURL + "!/" + path); |
| 154 | } |
| 155 | } |