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 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
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 * published by the Free Software Foundation.  Oracle designates this
 * particular file as subject to the "Classpath" exception as provided
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 *
 * 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,
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 *
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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 ImageOutputStream that writes its output directly to a File or RandomAccessFile. /**
 * An implementation of {@code ImageOutputStream} that writes its
 * output directly to a {@code File} or
 * {@code RandomAccessFile}.
 *
 */
public class FileImageOutputStream extends ImageOutputStreamImpl {

    private RandomAccessFile raf;

    
The referent to be registered with the Disposer. /** The referent to be registered with the Disposer. */
    private final Object disposerReferent;

    
The DisposerRecord that closes the underlying RandomAccessFile. /** The DisposerRecord that closes the underlying RandomAccessFile. */
    private final CloseableDisposerRecord disposerRecord;

    
Constructs a FileImageOutputStream that will write to a given File. 
Params:
f – a File to write to.
Throws:
IllegalArgumentException – if f is null.
SecurityException – if a security manager exists
and does not allow write access to the file.
FileNotFoundException – if f does not denote a regular file or it cannot be opened for reading and writing for any other reason.
IOException – if an I/O error occurs./**
     * Constructs a {@code FileImageOutputStream} that will write
     * to a given {@code File}.
     *
     * @param f a {@code File} to write to.
     *
     * @exception IllegalArgumentException if {@code f} is
     * {@code null}.
     * @exception SecurityException if a security manager exists
     * and does not allow write access to the file.
     * @exception FileNotFoundException if {@code f} does not denote
     * a regular file or it cannot be opened for reading and writing for any
     * other reason.
     * @exception IOException if an I/O error occurs.
     */
    public FileImageOutputStream(File f)
        throws FileNotFoundException, IOException {
        this(f == null ? null : new RandomAccessFile(f, "rw"));
    }

    
Constructs a FileImageOutputStream that will write to a given RandomAccessFile. 
Params:
raf – a RandomAccessFile to write to.
Throws:
IllegalArgumentException – if raf is null./**
     * Constructs a {@code FileImageOutputStream} that will write
     * to a given {@code RandomAccessFile}.
     *
     * @param raf a {@code RandomAccessFile} to write to.
     *
     * @exception IllegalArgumentException if {@code raf} is
     * {@code null}.
     */
    public FileImageOutputStream(RandomAccessFile raf) {
        if (raf == null) {
            throw new IllegalArgumentException("raf == null!");
        }
        this.raf = raf;

        disposerRecord = new CloseableDisposerRecord(raf);
        if (getClass() == FileImageOutputStream.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;
    }

    public void write(int b) throws IOException {
        flushBits(); // this will call checkClosed() for us
        raf.write(b);
        ++streamPos;
    }

    public void write(byte[] b, int off, int len) throws IOException {
        flushBits(); // this will call checkClosed() for us
        raf.write(b, off, len);
        streamPos += len;
    }

    public long length() {
        try {
            checkClosed();
            return raf.length();
        } catch (IOException e) {
            return -1L;
        }
    }

    
Sets the current stream position and resets the bit offset to 0. It is legal to seeking past the end of the file; an EOFException will be thrown only if a read is performed. The file length will not be increased until a write is performed. 
Throws:
IndexOutOfBoundsException – if pos is smaller than the flushed position.
IOException – if any other I/O error occurs./**
     * Sets the current stream position and resets the bit offset to
     * 0.  It is legal to seeking past the end of the file; an
     * {@code EOFException} will be thrown only if a read is
     * performed.  The file length will not be increased until a write
     * is performed.
     *
     * @exception IndexOutOfBoundsException if {@code pos} is smaller
     * than the flushed position.
     * @exception IOException if any other I/O error occurs.
     */
    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}
Deprecated:
The finalize method has been deprecated. Subclasses that override finalize in order to perform cleanup should be modified to use alternative cleanup mechanisms and to remove the overriding finalize method. When overriding the finalize method, its implementation must explicitly ensure that super.finalize() is invoked as described in Object.finalize. See the specification for Object.finalize() for further information about migration options./**
     * {@inheritDoc}
     *
     * @deprecated The {@code finalize} method has been deprecated.
     *     Subclasses that override {@code finalize} in order to perform cleanup
     *     should be modified to use alternative cleanup mechanisms and
     *     to remove the overriding {@code finalize} method.
     *     When overriding the {@code finalize} method, its implementation must explicitly
     *     ensure that {@code super.finalize()} is invoked as described in {@link Object#finalize}.
     *     See the specification for {@link Object#finalize()} for further
     *     information about migration options.
     */
    @Deprecated(since="9")
    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
    }
}