java.lang.Object
javax.imageio.stream.ImageInputStreamImpl
javax.imageio.stream.FileImageInputStream
- All Implemented Interfaces:
Closeable
,DataInput
,AutoCloseable
,ImageInputStream
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.-
Field Summary
Fields declared in class javax.imageio.stream.ImageInputStreamImpl
bitOffset, byteOrder, flushedPos, streamPos
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Constructor Summary
ConstructorDescriptionConstructs aFileImageInputStream
that will read from a givenFile
.Constructs aFileImageInputStream
that will read from a givenRandomAccessFile
. -
Method Summary
Modifier and TypeMethodDescriptionprotected void
finalize()
Deprecated, for removal: This API element is subject to removal in a future version.Finalization has been deprecated for removal.long
length()
Returns the length of the underlying file, or-1
if it is unknown.int
read()
Reads a single byte from the stream and returns it as anint
between 0 and 255.int
read
(byte[] b, int off, int len) Reads up tolen
bytes from the stream, and stores them intob
starting at indexoff
.Methods declared in class javax.imageio.stream.ImageInputStreamImpl
checkClosed, close, flush, flushBefore, getBitOffset, getByteOrder, getFlushedPosition, getStreamPosition, isCached, isCachedFile, isCachedMemory, mark, read, readBit, readBits, readBoolean, readByte, readBytes, readChar, readDouble, readFloat, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readFully, readInt, readLine, readLong, readShort, readUnsignedByte, readUnsignedInt, readUnsignedShort, readUTF, reset, seek, setBitOffset, setByteOrder, skipBytes, skipBytes
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Constructor Details
-
FileImageInputStream
Constructs aFileImageInputStream
that will read from a givenFile
.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
- aFile
to read from.- Throws:
IllegalArgumentException
- iff
isnull
.SecurityException
- if a security manager exists and does not allow read access to the file.FileNotFoundException
- iff
is a directory or cannot be opened for reading for any other reason.IOException
- if an I/O error occurs.
-
FileImageInputStream
Constructs aFileImageInputStream
that will read from a givenRandomAccessFile
.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
- aRandomAccessFile
to read from.- Throws:
IllegalArgumentException
- ifraf
isnull
.
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Method Details
-
read
Description copied from class:ImageInputStreamImpl
Reads a single byte from the stream and returns it as anint
between 0 and 255. If EOF is reached,-1
is returned.Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.
The bit offset within the stream must be reset to zero before the read occurs.
- Specified by:
read
in interfaceImageInputStream
- Specified by:
read
in classImageInputStreamImpl
- Returns:
- the value of the next byte in the stream, or
-1
if EOF is reached. - Throws:
IOException
- if the stream has been closed.
-
read
Description copied from class:ImageInputStreamImpl
Reads up tolen
bytes from the stream, and stores them intob
starting at indexoff
. If no bytes can be read because the end of the stream has been reached,-1
is returned.The bit offset within the stream must be reset to zero before the read occurs.
Subclasses must provide an implementation for this method. The subclass implementation should update the stream position before exiting.
- Specified by:
read
in interfaceImageInputStream
- Specified by:
read
in classImageInputStreamImpl
- Parameters:
b
- an array of bytes to be written to.off
- the starting position withinb
to write to.len
- the maximum number of bytes to read.- Returns:
- the number of bytes actually read, or
-1
to indicate EOF. - Throws:
IOException
- if an I/O error occurs.
-
length
public long length()Returns the length of the underlying file, or-1
if it is unknown.- Specified by:
length
in interfaceImageInputStream
- Overrides:
length
in classImageInputStreamImpl
- Returns:
- the file length as a
long
, or-1
.
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finalize
Deprecated, for removal: This API element is subject to removal in a future version.Finalization has been deprecated for removal. SeeObject.finalize()
for background information and details about migration options.Finalizes this object prior to garbage collection. Theclose
method is called to close any open input source. This method should not be called from application code.- Overrides:
finalize
in classImageInputStreamImpl
- Throws:
Throwable
- if an error occurs during superclass finalization.- See Also:
-