Showing the changes to java/pkg/javax/imageio/stream/FileImageOutputStream.java (1 of 18352 files). Show all
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| 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>ImageOutputStream</code> that writes its | |
| 38 | + * output directly to a <code>File</code> or | |
| 39 | + * <code>RandomAccessFile</code>. | |
| 40 | + * | |
| 41 | + */ | |
| 42 | +public class FileImageOutputStream extends ImageOutputStreamImpl { | |
| 43 | + | |
| 44 | + private RandomAccessFile raf; | |
| 45 | + | |
| 46 | + /** The referent to be registered with the Disposer. */ | |
| 47 | + private final Object disposerReferent; | |
| 48 | + | |
| 49 | + /** The DisposerRecord that closes the underlying RandomAccessFile. */ | |
| 50 | + private final CloseableDisposerRecord disposerRecord; | |
| 51 | + | |
| 52 | + /** | |
| 53 | + * Constructs a <code>FileImageOutputStream</code> that will write | |
| 54 | + * to a given <code>File</code>. | |
| 55 | + * | |
| 56 | + * @param f a <code>File</code> to write to. | |
| 57 | + * | |
| 58 | + * @exception IllegalArgumentException if <code>f</code> is | |
| 59 | + * <code>null</code>. | |
| 60 | + * @exception SecurityException if a security manager exists | |
| 61 | + * and does not allow write access to the file. | |
| 62 | + * @exception FileNotFoundException if <code>f</code> does not denote | |
| 63 | + * a regular file or it cannot be opened for reading and writing for any | |
| 64 | + * other reason. | |
| 65 | + * @exception IOException if an I/O error occurs. | |
| 66 | + */ | |
| 67 | + public FileImageOutputStream(File f) | |
| 68 | + throws FileNotFoundException, IOException { | |
| 69 | + this(f == null ? null : new RandomAccessFile(f, "rw")); | |
| 70 | + } | |
| 71 | + | |
| 72 | + /** | |
| 73 | + * Constructs a <code>FileImageOutputStream</code> that will write | |
| 74 | + * to a given <code>RandomAccessFile</code>. | |
| 75 | + * | |
| 76 | + * @param raf a <code>RandomAccessFile</code> to write to. | |
| 77 | + * | |
| 78 | + * @exception IllegalArgumentException if <code>raf</code> is | |
| 79 | + * <code>null</code>. | |
| 80 | + */ | |
| 81 | + public FileImageOutputStream(RandomAccessFile raf) { | |
| 82 | + if (raf == null) { | |
| 83 | + throw new IllegalArgumentException("raf == null!"); | |
| 84 | + } | |
| 85 | + this.raf = raf; | |
| 86 | + | |
| 87 | + disposerRecord = new CloseableDisposerRecord(raf); | |
| 88 | + if (getClass() == FileImageOutputStream.class) { | |
| 89 | + disposerReferent = new Object(); | |
| 90 | + Disposer.addRecord(disposerReferent, disposerRecord); | |
| 91 | + } else { | |
| 92 | + disposerReferent = new StreamFinalizer(this); | |
| 93 | + } | |
| 94 | + } | |
| 95 | + | |
| 96 | + public int read() throws IOException { | |
| 97 | + checkClosed(); | |
| 98 | + bitOffset = 0; | |
| 99 | + int val = raf.read(); | |
| 100 | + if (val != -1) { | |
| 101 | + ++streamPos; | |
| 102 | + } | |
| 103 | + return val; | |
| 104 | + } | |
| 105 | + | |
| 106 | + public int read(byte[] b, int off, int len) throws IOException { | |
| 107 | + checkClosed(); | |
| 108 | + bitOffset = 0; | |
| 109 | + int nbytes = raf.read(b, off, len); | |
| 110 | + if (nbytes != -1) { | |
| 111 | + streamPos += nbytes; | |
| 112 | + } | |
| 113 | + return nbytes; | |
| 114 | + } | |
| 115 | + | |
| 116 | + public void write(int b) throws IOException { | |
| 117 | + flushBits(); // this will call checkClosed() for us | |
| 118 | + raf.write(b); | |
| 119 | + ++streamPos; | |
| 120 | + } | |
| 121 | + | |
| 122 | + public void write(byte[] b, int off, int len) throws IOException { | |
| 123 | + flushBits(); // this will call checkClosed() for us | |
| 124 | + raf.write(b, off, len); | |
| 125 | + streamPos += len; | |
| 126 | + } | |
| 127 | + | |
| 128 | + public long length() { | |
| 129 | + try { | |
| 130 | + checkClosed(); | |
| 131 | + return raf.length(); | |
| 132 | + } catch (IOException e) { | |
| 133 | + return -1L; | |
| 134 | + } | |
| 135 | + } | |
| 136 | + | |
| 137 | + /** | |
| 138 | + * Sets the current stream position and resets the bit offset to | |
| 139 | + * 0. It is legal to seeking past the end of the file; an | |
| 140 | + * <code>EOFException</code> will be thrown only if a read is | |
| 141 | + * performed. The file length will not be increased until a write | |
| 142 | + * is performed. | |
| 143 | + * | |
| 144 | + * @exception IndexOutOfBoundsException if <code>pos</code> is smaller | |
| 145 | + * than the flushed position. | |
| 146 | + * @exception IOException if any other I/O error occurs. | |
| 147 | + */ | |
| 148 | + public void seek(long pos) throws IOException { | |
| 149 | + checkClosed(); | |
| 150 | + if (pos < flushedPos) { | |
| 151 | + throw new IndexOutOfBoundsException("pos < flushedPos!"); | |
| 152 | + } | |
| 153 | + bitOffset = 0; | |
| 154 | + raf.seek(pos); | |
| 155 | + streamPos = raf.getFilePointer(); | |
| 156 | + } | |
| 157 | + | |
| 158 | + public void close() throws IOException { | |
| 159 | + super.close(); | |
| 160 | + disposerRecord.dispose(); // this closes the RandomAccessFile | |
| 161 | + raf = null; | |
| 162 | + } | |
| 163 | + | |
| 164 | + /** | |
| 165 | + * {@inheritDoc} | |
| 166 | + */ | |
| 167 | + protected void finalize() throws Throwable { | |
| 168 | + // Empty finalizer: for performance reasons we instead use the | |
| 169 | + // Disposer mechanism for ensuring that the underlying | |
| 170 | + // RandomAccessFile is closed prior to garbage collection | |
| 171 | + } | |
| 172 | +} | |