History

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/javax/imageio/stream/FileImageInputStream.java (1 of 18352 files). Show all

Unified · Split

java/pkg/javax/imageio/stream/FileImageInputStream.java+164−0
@@ -0,0 +1,164 @@
1+/*
2+ * Copyright (c) 2000, 2007, 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 javax.imageio.stream;
27+
28+import java.io.File;
29+import java.io.FileNotFoundException;
30+import java.io.IOException;
31+import java.io.RandomAccessFile;
32+import com.sun.imageio.stream.CloseableDisposerRecord;
33+import com.sun.imageio.stream.StreamFinalizer;
34+import sun.java2d.Disposer;
35+
36+/**
37+ * An implementation of <code>ImageInputStream</code> that gets its
38+ * input from a <code>File</code> or <code>RandomAccessFile</code>.
39+ * The file contents are assumed to be stable during the lifetime of
40+ * the object.
41+ *
42+ */
43+public class FileImageInputStream extends ImageInputStreamImpl {
44+
45+ private RandomAccessFile raf;
46+
47+ /** The referent to be registered with the Disposer. */
48+ private final Object disposerReferent;
49+
50+ /** The DisposerRecord that closes the underlying RandomAccessFile. */
51+ private final CloseableDisposerRecord disposerRecord;
52+
53+ /**
54+ * Constructs a <code>FileImageInputStream</code> that will read
55+ * from a given <code>File</code>.
56+ *
57+ * <p> The file contents must not change between the time this
58+ * object is constructed and the time of the last call to a read
59+ * method.
60+ *
61+ * @param f a <code>File</code> to read from.
62+ *
63+ * @exception IllegalArgumentException if <code>f</code> is
64+ * <code>null</code>.
65+ * @exception SecurityException if a security manager exists
66+ * and does not allow read access to the file.
67+ * @exception FileNotFoundException if <code>f</code> is a
68+ * directory or cannot be opened for reading for any other reason.
69+ * @exception IOException if an I/O error occurs.
70+ */
71+ public FileImageInputStream(File f)
72+ throws FileNotFoundException, IOException {
73+ this(f == null ? null : new RandomAccessFile(f, "r"));
74+ }
75+
76+ /**
77+ * Constructs a <code>FileImageInputStream</code> that will read
78+ * from a given <code>RandomAccessFile</code>.
79+ *
80+ * <p> The file contents must not change between the time this
81+ * object is constructed and the time of the last call to a read
82+ * method.
83+ *
84+ * @param raf a <code>RandomAccessFile</code> to read from.
85+ *
86+ * @exception IllegalArgumentException if <code>raf</code> is
87+ * <code>null</code>.
88+ */
89+ public FileImageInputStream(RandomAccessFile raf) {
90+ if (raf == null) {
91+ throw new IllegalArgumentException("raf == null!");
92+ }
93+ this.raf = raf;
94+
95+ disposerRecord = new CloseableDisposerRecord(raf);
96+ if (getClass() == FileImageInputStream.class) {
97+ disposerReferent = new Object();
98+ Disposer.addRecord(disposerReferent, disposerRecord);
99+ } else {
100+ disposerReferent = new StreamFinalizer(this);
101+ }
102+ }
103+
104+ public int read() throws IOException {
105+ checkClosed();
106+ bitOffset = 0;
107+ int val = raf.read();
108+ if (val != -1) {
109+ ++streamPos;
110+ }
111+ return val;
112+ }
113+
114+ public int read(byte[] b, int off, int len) throws IOException {
115+ checkClosed();
116+ bitOffset = 0;
117+ int nbytes = raf.read(b, off, len);
118+ if (nbytes != -1) {
119+ streamPos += nbytes;
120+ }
121+ return nbytes;
122+ }
123+
124+ /**
125+ * Returns the length of the underlying file, or <code>-1</code>
126+ * if it is unknown.
127+ *
128+ * @return the file length as a <code>long</code>, or
129+ * <code>-1</code>.
130+ */
131+ public long length() {
132+ try {
133+ checkClosed();
134+ return raf.length();
135+ } catch (IOException e) {
136+ return -1L;
137+ }
138+ }
139+
140+ public void seek(long pos) throws IOException {
141+ checkClosed();
142+ if (pos < flushedPos) {
143+ throw new IndexOutOfBoundsException("pos < flushedPos!");
144+ }
145+ bitOffset = 0;
146+ raf.seek(pos);
147+ streamPos = raf.getFilePointer();
148+ }
149+
150+ public void close() throws IOException {
151+ super.close();
152+ disposerRecord.dispose(); // this closes the RandomAccessFile
153+ raf = null;
154+ }
155+
156+ /**
157+ * {@inheritDoc}
158+ */
159+ protected void finalize() throws Throwable {
160+ // Empty finalizer: for performance reasons we instead use the
161+ // Disposer mechanism for ensuring that the underlying
162+ // RandomAccessFile is closed prior to garbage collection
163+ }
164+}