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Préférences
Moteurs de recherche
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JavaTM 2 Platform Std. Ed. v1.6.0
javax.imageio.stream
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Field Summary |
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Fields inherited from class javax.imageio.stream.ImageInputStreamImpl |
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bitOffset, byteOrder, flushedPos, streamPos |
Constructor Summary | |
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FileImageInputStream(File f)
Constructs a FileImageInputStream that will read
from a given File . |
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FileImageInputStream(RandomAccessFile raf)
Constructs a FileImageInputStream that will read
from a given RandomAccessFile . |
Method Summary | |
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void |
close()
Closes the stream. |
protected void |
finalize()
Finalizes this object prior to garbage collection. |
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 an int between 0 and 255. |
int |
read(byte[] b,
int off,
int len)
Reads up to len bytes from the stream, and stores
them into b starting at index off . |
void |
seek(long pos)
Sets the current stream position to the desired location. |
Methods inherited from class javax.imageio.stream.ImageInputStreamImpl |
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checkClosed, 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, setBitOffset, setByteOrder, skipBytes, skipBytes |
Methods inherited from class java.lang.Object |
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clone, equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public FileImageInputStream(File f) throws FileNotFoundException, IOException
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.
f
- a File
to read from.
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.public FileImageInputStream(RandomAccessFile raf)
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.
raf
- a RandomAccessFile
to read from.
IllegalArgumentException
- if raf
is
null
.Method Detail |
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public int read() throws IOException
ImageInputStreamImpl
int
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.
read
in interface ImageInputStream
read
in class ImageInputStreamImpl
-1
if EOF is reached.
IOException
- if the stream has been closed.public int read(byte[] b, int off, int len) throws IOException
ImageInputStreamImpl
len
bytes from the stream, and stores
them into b
starting at index off
.
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.
read
in interface ImageInputStream
read
in class ImageInputStreamImpl
b
- an array of bytes to be written to.off
- the starting position within b
to write to.len
- the maximum number of bytes to read.
-1
to indicate EOF.
IOException
- if an I/O error occurs.public long length()
-1
if it is unknown.
length
in interface ImageInputStream
length
in class ImageInputStreamImpl
long
, or
-1
.public void seek(long pos) throws IOException
ImageInputStream
An IndexOutOfBoundsException
will be thrown if
pos
is smaller than the flushed position (as
returned by getflushedPosition
).
It is legal to seek past the end of the file; an
EOFException
will be thrown only if a read is
performed.
seek
in interface ImageInputStream
seek
in class ImageInputStreamImpl
pos
- a long
containing the desired file
pointer position.
IOException
- if any other I/O error occurs.public void close() throws IOException
ImageInputStream
IOException
s or incorrect
behavior. Calling this method may allow classes implementing
this interface to release resources associated with the stream
such as memory, disk space, or file descriptors.
close
in interface ImageInputStream
close
in class ImageInputStreamImpl
IOException
- if an I/O error occurs.protected void finalize() throws Throwable
close
method is called to close any open input
source. This method should not be called from application
code.
finalize
in class ImageInputStreamImpl
Throwable
- if an error occurs during superclass
finalization.