Class FileImageInputStream

All Implemented Interfaces:
Closeable, DataInput, AutoCloseable, ImageInputStream 
public class FileImageInputStream
extends ImageInputStreamImpl

An implementation of ImageInputStream that gets its input from a File or RandomAccessFile. The file contents are assumed to be stable during the lifetime of the object.

Fields

Fields declared in class javax.imageio.stream.ImageInputStreamImpl

bitOffset, byteOrder, flushedPos, streamPos

Constructors

Constructor Description
FileImageInputStream​(File f)

Constructs a FileImageInputStream that will read from a given File.
FileImageInputStream​(RandomAccessFile raf)

Constructs a FileImageInputStream that will read from a given RandomAccessFile.

Methods

Modifier and Type Method Description
protected void finalize()

Deprecated.

The finalize method has been deprecated.
long length()

Returns the length of the underlying file, or -1 if it is unknown.

Methods declared in class javax.imageio.stream.ImageInputStreamImpl

checkClosed, isCached, isCachedFile, isCachedMemory, mark, read, read, read, reset, skipBytes, skipBytes

Methods declared in class java.lang.Object

clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Methods declared in interface javax.imageio.stream.ImageInputStream

close, flush, flushBefore, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF, seek, setBitOffset, setByteOrder

Constructors

FileImageInputStream

public FileImageInputStream(File f)
                     throws FileNotFoundException,
                            IOException

Constructs a FileImageInputStream that will read from a given File.

The file contents must not change between the time this object is constructed and the time of the last call to a read method.

Parameters:
f - a File to read from.
Throws:
IllegalArgumentException - if f is null.
SecurityException - if a security manager exists and does not allow read access to the file.
FileNotFoundException - if f is a directory or cannot be opened for reading for any other reason.
IOException - if an I/O error occurs.

FileImageInputStream

public FileImageInputStream(RandomAccessFile raf)

Constructs a FileImageInputStream that will read from a given RandomAccessFile.

The file contents must not change between the time this object is constructed and the time of the last call to a read method.

Parameters:
raf - a RandomAccessFile to read from.
Throws:
IllegalArgumentException - if raf is null.

Methods

length

public long length()

Returns the length of the underlying file, or -1 if it is unknown.

Specified by:
length in interface ImageInputStream
Overrides:
length in class ImageInputStreamImpl
Returns:
the file length as a long, or -1.

finalize

@Deprecated(since="9")
protected void finalize()
                 throws Throwable
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.

Finalizes this object prior to garbage collection. The close method is called to close any open input source. This method should not be called from application code.

Overrides:
finalize in class ImageInputStreamImpl
Throws:
Throwable - if an error occurs during superclass finalization.
See Also:
WeakReference, PhantomReference

© 1993, 2020, Oracle and/or its affiliates. All rights reserved.
Documentation extracted from Debian's OpenJDK Development Kit package.
Licensed under the GNU General Public License, version 2, with the Classpath Exception.
Various third party code in OpenJDK is licensed under different licenses (see Debian package).
Java and OpenJDK are trademarks or registered trademarks of Oracle and/or its affiliates.
https://docs.oracle.com/en/java/javase/11/docs/api/java.desktop/javax/imageio/stream/FileImageInputStream.html