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My first initial commit with all of mine experimental changes.

Dmitry Kabak (userdima committed 13 years ago

Commit d37b88d1 parent 3f5b46618352 files · +2598093 −-8690Browse files

Showing the changes to java/pkg/sun/misc/Resource.java (1 of 18352 files). Show all

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java/pkg/sun/misc/Resource.java+187−0
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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
26package sun.misc;
27
28import java.io.EOFException;
29import java.net.URL;
30import java.io.IOException;
31import java.io.InterruptedIOException;
32import java.io.InputStream;
33import java.security.CodeSigner;
34import java.util.jar.Manifest;
35import java.nio.ByteBuffer;
36import java.util.Arrays;
37import 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 */
46public 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}