/* * Copyright (c) 2000, 2007, 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 javax.imageio.stream;import java.io.File;import java.io.FileNotFoundException;import java.io.IOException;import java.io.RandomAccessFile;import com.sun.imageio.stream.CloseableDisposerRecord;import com.sun.imageio.stream.StreamFinalizer;import sun.java2d.Disposer;/** * An implementation of <code>ImageInputStream</code> that gets its * input from a <code>File</code> or <code>RandomAccessFile</code>. * The file contents are assumed to be stable during the lifetime of * the object. * */public class FileImageInputStream extends ImageInputStreamImpl { private RandomAccessFile raf; /** The referent to be registered with the Disposer. */ private final Object disposerReferent; /** The DisposerRecord that closes the underlying RandomAccessFile. */ private final CloseableDisposerRecord disposerRecord; /** * Constructs a <code>FileImageInputStream</code> that will read * from a given <code>File</code>. * * <p> The file contents must not change between the time this * object is constructed and the time of the last call to a read * method. * * @param f a <code>File</code> to read from. * * @exception IllegalArgumentException if <code>f</code> is * <code>null</code>. * @exception SecurityException if a security manager exists * and does not allow read access to the file. * @exception FileNotFoundException if <code>f</code> is a * directory or cannot be opened for reading for any other reason. * @exception IOException if an I/O error occurs. */ public FileImageInputStream(File f) throws FileNotFoundException, IOException { this(f == null ? null : new RandomAccessFile(f, "r")); } /** * Constructs a <code>FileImageInputStream</code> that will read * from a given <code>RandomAccessFile</code>. * * <p> The file contents must not change between the time this * object is constructed and the time of the last call to a read * method. * * @param raf a <code>RandomAccessFile</code> to read from. * * @exception IllegalArgumentException if <code>raf</code> is * <code>null</code>. */ public FileImageInputStream(RandomAccessFile raf) { if (raf == null) { throw new IllegalArgumentException("raf == null!"); } this.raf = raf; disposerRecord = new CloseableDisposerRecord(raf); if (getClass() == FileImageInputStream.class) { disposerReferent = new Object(); Disposer.addRecord(disposerReferent, disposerRecord); } else { disposerReferent = new StreamFinalizer(this); } } public int read() throws IOException { checkClosed(); bitOffset = 0; int val = raf.read(); if (val != -1) { ++streamPos; } return val; } public int read(byte[] b, int off, int len) throws IOException { checkClosed(); bitOffset = 0; int nbytes = raf.read(b, off, len); if (nbytes != -1) { streamPos += nbytes; } return nbytes; } /** * Returns the length of the underlying file, or <code>-1</code> * if it is unknown. * * @return the file length as a <code>long</code>, or * <code>-1</code>. */ public long length() { try { checkClosed(); return raf.length(); } catch (IOException e) { return -1L; } } public void seek(long pos) throws IOException { checkClosed(); if (pos < flushedPos) { throw new IndexOutOfBoundsException("pos < flushedPos!"); } bitOffset = 0; raf.seek(pos); streamPos = raf.getFilePointer(); } public void close() throws IOException { super.close(); disposerRecord.dispose(); // this closes the RandomAccessFile raf = null; } /** * {@inheritDoc} */ protected void finalize() throws Throwable { // Empty finalizer: for performance reasons we instead use the // Disposer mechanism for ensuring that the underlying // RandomAccessFile is closed prior to garbage collection }}
/*
* Copyright (c) 2000, 2007, 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 javax.imageio.stream;
import java.io.File;
import java.io.FileNotFoundException;
import java.io.IOException;
import java.io.RandomAccessFile;
import com.sun.imageio.stream.CloseableDisposerRecord;
import com.sun.imageio.stream.StreamFinalizer;
import sun.java2d.Disposer;
/**
* An implementation of <code>ImageInputStream</code> that gets its
* input from a <code>File</code> or <code>RandomAccessFile</code>.
* The file contents are assumed to be stable during the lifetime of
* the object.
*
*/
public class FileImageInputStream extends ImageInputStreamImpl {
private RandomAccessFile raf;
/** The referent to be registered with the Disposer. */
private final Object disposerReferent;
/** The DisposerRecord that closes the underlying RandomAccessFile. */
private final CloseableDisposerRecord disposerRecord;
/**
* Constructs a <code>FileImageInputStream</code> that will read
* from a given <code>File</code>.
*
* <p> The file contents must not change between the time this
* object is constructed and the time of the last call to a read
* method.
*
* @param f a <code>File</code> to read from.
*
* @exception IllegalArgumentException if <code>f</code> is
* <code>null</code>.
* @exception SecurityException if a security manager exists
* and does not allow read access to the file.
* @exception FileNotFoundException if <code>f</code> is a
* directory or cannot be opened for reading for any other reason.
* @exception IOException if an I/O error occurs.
*/
public FileImageInputStream(File f)
throws FileNotFoundException, IOException {
this(f == null ? null : new RandomAccessFile(f, "r"));
}
/**
* Constructs a <code>FileImageInputStream</code> that will read
* from a given <code>RandomAccessFile</code>.
*
* <p> The file contents must not change between the time this
* object is constructed and the time of the last call to a read
* method.
*
* @param raf a <code>RandomAccessFile</code> to read from.
*
* @exception IllegalArgumentException if <code>raf</code> is
* <code>null</code>.
*/
public FileImageInputStream(RandomAccessFile raf) {
if (raf == null) {
throw new IllegalArgumentException("raf == null!");
}
this.raf = raf;
disposerRecord = new CloseableDisposerRecord(raf);
if (getClass() == FileImageInputStream.class) {
disposerReferent = new Object();
Disposer.addRecord(disposerReferent, disposerRecord);
} else {
disposerReferent = new StreamFinalizer(this);
}
}
public int read() throws IOException {
checkClosed();
bitOffset = 0;
int val = raf.read();
if (val != -1) {
++streamPos;
}
return val;
}
public int read(byte[] b, int off, int len) throws IOException {
checkClosed();
bitOffset = 0;
int nbytes = raf.read(b, off, len);
if (nbytes != -1) {
streamPos += nbytes;
}
return nbytes;
}
/**
* Returns the length of the underlying file, or <code>-1</code>
* if it is unknown.
*
* @return the file length as a <code>long</code>, or
* <code>-1</code>.
*/
public long length() {
try {
checkClosed();
return raf.length();
} catch (IOException e) {
return -1L;
}
}
public void seek(long pos) throws IOException {
checkClosed();
if (pos < flushedPos) {
throw new IndexOutOfBoundsException("pos < flushedPos!");
}
bitOffset = 0;
raf.seek(pos);
streamPos = raf.getFilePointer();
}
public void close() throws IOException {
super.close();
disposerRecord.dispose(); // this closes the RandomAccessFile
raf = null;
}
/**
* {@inheritDoc}
*/
protected void finalize() throws Throwable {
// Empty finalizer: for performance reasons we instead use the
// Disposer mechanism for ensuring that the underlying
// RandomAccessFile is closed prior to garbage collection
}
}