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| 1 | +/* | |
| 2 | + * Copyright (c) 1998, 2009, Oracle and/or its affiliates. All rights reserved. | |
| 3 | + * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. | |
| 4 | + * | |
| 5 | + * This code is free software; you can redistribute it and/or modify it | |
| 6 | + * under the terms of the GNU General Public License version 2 only, as | |
| 7 | + * published by the Free Software Foundation. Oracle designates this | |
| 8 | + * particular file as subject to the "Classpath" exception as provided | |
| 9 | + * by Oracle in the LICENSE file that accompanied this code. | |
| 10 | + * | |
| 11 | + * This code is distributed in the hope that it will be useful, but WITHOUT | |
| 12 | + * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | |
| 13 | + * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | |
| 14 | + * version 2 for more details (a copy is included in the LICENSE file that | |
| 15 | + * accompanied this code). | |
| 16 | + * | |
| 17 | + * You should have received a copy of the GNU General Public License version | |
| 18 | + * 2 along with this work; if not, write to the Free Software Foundation, | |
| 19 | + * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | |
| 20 | + * | |
| 21 | + * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | |
| 22 | + * or visit www.oracle.com if you need additional information or have any | |
| 23 | + * questions. | |
| 24 | + */ | |
| 25 | + | |
| 26 | +package sun.misc; | |
| 27 | + | |
| 28 | +import java.io.EOFException; | |
| 29 | +import java.net.URL; | |
| 30 | +import java.io.IOException; | |
| 31 | +import java.io.InterruptedIOException; | |
| 32 | +import java.io.InputStream; | |
| 33 | +import java.security.CodeSigner; | |
| 34 | +import java.util.jar.Manifest; | |
| 35 | +import java.nio.ByteBuffer; | |
| 36 | +import java.util.Arrays; | |
| 37 | +import sun.nio.ByteBuffered; | |
| 38 | + | |
| 39 | +/** | |
| 40 | + * This class is used to represent a Resource that has been loaded | |
| 41 | + * from the class path. | |
| 42 | + * | |
| 43 | + * @author David Connelly | |
| 44 | + * @since 1.2 | |
| 45 | + */ | |
| 46 | +public abstract class Resource { | |
| 47 | + /** | |
| 48 | + * Returns the name of the Resource. | |
| 49 | + */ | |
| 50 | + public abstract String getName(); | |
| 51 | + | |
| 52 | + /** | |
| 53 | + * Returns the URL of the Resource. | |
| 54 | + */ | |
| 55 | + public abstract URL getURL(); | |
| 56 | + | |
| 57 | + /** | |
| 58 | + * Returns the CodeSource URL for the Resource. | |
| 59 | + */ | |
| 60 | + public abstract URL getCodeSourceURL(); | |
| 61 | + | |
| 62 | + /** | |
| 63 | + * Returns an InputStream for reading the Resource data. | |
| 64 | + */ | |
| 65 | + public abstract InputStream getInputStream() throws IOException; | |
| 66 | + | |
| 67 | + /** | |
| 68 | + * Returns the length of the Resource data, or -1 if unknown. | |
| 69 | + */ | |
| 70 | + public abstract int getContentLength() throws IOException; | |
| 71 | + | |
| 72 | + private InputStream cis; | |
| 73 | + | |
| 74 | + /* Cache result in case getBytes is called after getByteBuffer. */ | |
| 75 | + private synchronized InputStream cachedInputStream() throws IOException { | |
| 76 | + if (cis == null) { | |
| 77 | + cis = getInputStream(); | |
| 78 | + } | |
| 79 | + return cis; | |
| 80 | + } | |
| 81 | + | |
| 82 | + /** | |
| 83 | + * Returns the Resource data as an array of bytes. | |
| 84 | + */ | |
| 85 | + public byte[] getBytes() throws IOException { | |
| 86 | + byte[] b; | |
| 87 | + // Get stream before content length so that a FileNotFoundException | |
| 88 | + // can propagate upwards without being caught too early | |
| 89 | + InputStream in = cachedInputStream(); | |
| 90 | + | |
| 91 | + // This code has been uglified to protect against interrupts. | |
| 92 | + // Even if a thread has been interrupted when loading resources, | |
| 93 | + // the IO should not abort, so must carefully retry, failing only | |
| 94 | + // if the retry leads to some other IO exception. | |
| 95 | + | |
| 96 | + boolean isInterrupted = Thread.interrupted(); | |
| 97 | + int len; | |
| 98 | + for (;;) { | |
| 99 | + try { | |
| 100 | + len = getContentLength(); | |
| 101 | + break; | |
| 102 | + } catch (InterruptedIOException iioe) { | |
| 103 | + Thread.interrupted(); | |
| 104 | + isInterrupted = true; | |
| 105 | + } | |
| 106 | + } | |
| 107 | + | |
| 108 | + try { | |
| 109 | + b = new byte[0]; | |
| 110 | + if (len == -1) len = Integer.MAX_VALUE; | |
| 111 | + int pos = 0; | |
| 112 | + while (pos < len) { | |
| 113 | + int bytesToRead; | |
| 114 | + if (pos >= b.length) { // Only expand when there's no room | |
| 115 | + bytesToRead = Math.min(len - pos, b.length + 1024); | |
| 116 | + if (b.length < pos + bytesToRead) { | |
| 117 | + b = Arrays.copyOf(b, pos + bytesToRead); | |
| 118 | + } | |
| 119 | + } else { | |
| 120 | + bytesToRead = b.length - pos; | |
| 121 | + } | |
| 122 | + int cc = 0; | |
| 123 | + try { | |
| 124 | + cc = in.read(b, pos, bytesToRead); | |
| 125 | + } catch (InterruptedIOException iioe) { | |
| 126 | + Thread.interrupted(); | |
| 127 | + isInterrupted = true; | |
| 128 | + } | |
| 129 | + if (cc < 0) { | |
| 130 | + if (len != Integer.MAX_VALUE) { | |
| 131 | + throw new EOFException("Detect premature EOF"); | |
| 132 | + } else { | |
| 133 | + if (b.length != pos) { | |
| 134 | + b = Arrays.copyOf(b, pos); | |
| 135 | + } | |
| 136 | + break; | |
| 137 | + } | |
| 138 | + } | |
| 139 | + pos += cc; | |
| 140 | + } | |
| 141 | + } finally { | |
| 142 | + try { | |
| 143 | + in.close(); | |
| 144 | + } catch (InterruptedIOException iioe) { | |
| 145 | + isInterrupted = true; | |
| 146 | + } catch (IOException ignore) {} | |
| 147 | + | |
| 148 | + if (isInterrupted) { | |
| 149 | + Thread.currentThread().interrupt(); | |
| 150 | + } | |
| 151 | + } | |
| 152 | + return b; | |
| 153 | + } | |
| 154 | + | |
| 155 | + /** | |
| 156 | + * Returns the Resource data as a ByteBuffer, but only if the input stream | |
| 157 | + * was implemented on top of a ByteBuffer. Return <tt>null</tt> otherwise. | |
| 158 | + */ | |
| 159 | + public ByteBuffer getByteBuffer() throws IOException { | |
| 160 | + InputStream in = cachedInputStream(); | |
| 161 | + if (in instanceof ByteBuffered) { | |
| 162 | + return ((ByteBuffered)in).getByteBuffer(); | |
| 163 | + } | |
| 164 | + return null; | |
| 165 | + } | |
| 166 | + | |
| 167 | + /** | |
| 168 | + * Returns the Manifest for the Resource, or null if none. | |
| 169 | + */ | |
| 170 | + public Manifest getManifest() throws IOException { | |
| 171 | + return null; | |
| 172 | + } | |
| 173 | + | |
| 174 | + /** | |
| 175 | + * Returns theCertificates for the Resource, or null if none. | |
| 176 | + */ | |
| 177 | + public java.security.cert.Certificate[] getCertificates() { | |
| 178 | + return null; | |
| 179 | + } | |
| 180 | + | |
| 181 | + /** | |
| 182 | + * Returns the code signers for the Resource, or null if none. | |
| 183 | + */ | |
| 184 | + public CodeSigner[] getCodeSigners() { | |
| 185 | + return null; | |
| 186 | + } | |
| 187 | +} | |