| /* |
| * Copyright (c) 1998, 2009, Oracle and/or its affiliates. All rights reserved. |
| * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| * |
| * This code is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License version 2 only, as |
| * published by the Free Software Foundation. Oracle designates this |
| * particular file as subject to the "Classpath" exception as provided |
| * by Oracle in the LICENSE file that accompanied this code. |
| * |
| * This code is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| * version 2 for more details (a copy is included in the LICENSE file that |
| * accompanied this code). |
| * |
| * You should have received a copy of the GNU General Public License version |
| * 2 along with this work; if not, write to the Free Software Foundation, |
| * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| * |
| * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA |
| * or visit www.oracle.com if you need additional information or have any |
| * questions. |
| */ |
| |
| package jdk.internal.loader; |
| |
| import java.io.EOFException; |
| import java.net.URL; |
| import java.io.IOException; |
| import java.io.InterruptedIOException; |
| import java.io.InputStream; |
| import java.security.CodeSigner; |
| import java.util.jar.Manifest; |
| import java.nio.ByteBuffer; |
| import java.util.Arrays; |
| import sun.nio.ByteBuffered; |
| |
| /** |
| * This class is used to represent a Resource that has been loaded |
| * from the class path. |
| * |
| * @author David Connelly |
| * @since 1.2 |
| */ |
| public abstract class Resource { |
| /** |
| * Returns the name of the Resource. |
| */ |
| public abstract String getName(); |
| |
| /** |
| * Returns the URL of the Resource. |
| */ |
| public abstract URL getURL(); |
| |
| /** |
| * Returns the CodeSource URL for the Resource. |
| */ |
| public abstract URL getCodeSourceURL(); |
| |
| /** |
| * Returns an InputStream for reading the Resource data. |
| */ |
| public abstract InputStream getInputStream() throws IOException; |
| |
| /** |
| * Returns the length of the Resource data, or -1 if unknown. |
| */ |
| public abstract int getContentLength() throws IOException; |
| |
| private InputStream cis; |
| |
| /* Cache result in case getBytes is called after getByteBuffer. */ |
| private synchronized InputStream cachedInputStream() throws IOException { |
| if (cis == null) { |
| cis = getInputStream(); |
| } |
| return cis; |
| } |
| |
| /** |
| * Returns the Resource data as an array of bytes. |
| */ |
| public byte[] getBytes() throws IOException { |
| byte[] b; |
| // Get stream before content length so that a FileNotFoundException |
| // can propagate upwards without being caught too early |
| InputStream in = cachedInputStream(); |
| |
| // This code has been uglified to protect against interrupts. |
| // Even if a thread has been interrupted when loading resources, |
| // the IO should not abort, so must carefully retry, failing only |
| // if the retry leads to some other IO exception. |
| |
| boolean isInterrupted = Thread.interrupted(); |
| int len; |
| for (;;) { |
| try { |
| len = getContentLength(); |
| break; |
| } catch (InterruptedIOException iioe) { |
| Thread.interrupted(); |
| isInterrupted = true; |
| } |
| } |
| |
| try { |
| b = new byte[0]; |
| if (len == -1) len = Integer.MAX_VALUE; |
| int pos = 0; |
| while (pos < len) { |
| int bytesToRead; |
| if (pos >= b.length) { // Only expand when there's no room |
| bytesToRead = Math.min(len - pos, b.length + 1024); |
| if (b.length < pos + bytesToRead) { |
| b = Arrays.copyOf(b, pos + bytesToRead); |
| } |
| } else { |
| bytesToRead = b.length - pos; |
| } |
| int cc = 0; |
| try { |
| cc = in.read(b, pos, bytesToRead); |
| } catch (InterruptedIOException iioe) { |
| Thread.interrupted(); |
| isInterrupted = true; |
| } |
| if (cc < 0) { |
| if (len != Integer.MAX_VALUE) { |
| throw new EOFException("Detect premature EOF"); |
| } else { |
| if (b.length != pos) { |
| b = Arrays.copyOf(b, pos); |
| } |
| break; |
| } |
| } |
| pos += cc; |
| } |
| } finally { |
| try { |
| in.close(); |
| } catch (InterruptedIOException iioe) { |
| isInterrupted = true; |
| } catch (IOException ignore) {} |
| |
| if (isInterrupted) { |
| Thread.currentThread().interrupt(); |
| } |
| } |
| return b; |
| } |
| |
| /** |
| * Returns the Resource data as a ByteBuffer, but only if the input stream |
| * was implemented on top of a ByteBuffer. Return {@code null} otherwise. |
| * @return Resource data or null. |
| */ |
| public ByteBuffer getByteBuffer() throws IOException { |
| InputStream in = cachedInputStream(); |
| if (in instanceof ByteBuffered) { |
| return ((ByteBuffered)in).getByteBuffer(); |
| } |
| return null; |
| } |
| |
| /** |
| * Returns the Manifest for the Resource, or null if none. |
| */ |
| public Manifest getManifest() throws IOException { |
| return null; |
| } |
| |
| /** |
| * Returns theCertificates for the Resource, or null if none. |
| */ |
| public java.security.cert.Certificate[] getCertificates() { |
| return null; |
| } |
| |
| /** |
| * Returns the code signers for the Resource, or null if none. |
| */ |
| public CodeSigner[] getCodeSigners() { |
| return null; |
| } |
| } |