Package com.itextpdf.io.source
Class RAFRandomAccessSource
java.lang.Object
com.itextpdf.io.source.RAFRandomAccessSource
- All Implemented Interfaces:
IRandomAccessSource
A RandomAccessSource that uses a
RandomAccessFile
as it's source
Note: Unlike most of the RandomAccessSource implementations, this class is not thread safe-
Field Summary
FieldsModifier and TypeFieldDescriptionprivate final long
The length of the underling RAF.private final RandomAccessFile
The source -
Constructor Summary
Constructors -
Method Summary
Modifier and TypeMethodDescriptionvoid
close()
Closes the underlying RandomAccessFileint
get
(long position) Gets a byte at the specified positionint
get
(long position, byte[] bytes, int off, int len) Read an array of bytes of specified length from the specified position of source to the buffer applying the offset.long
length()
Gets the length of the source
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Field Details
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raf
The source -
length
private final long lengthThe length of the underling RAF. Note that the length is cached at construction time to avoid the possibility ofIOException
s when reading the length.
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Constructor Details
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RAFRandomAccessSource
Creates this object- Parameters:
raf
- the source for this RandomAccessSource- Throws:
IOException
- if the RAF can't be read
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Method Details
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get
Gets a byte at the specified position- Specified by:
get
in interfaceIRandomAccessSource
- Parameters:
position
- byte position- Returns:
- the byte, or -1 if EOF is reached
- Throws:
IOException
- in case of any reading error.
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get
Read an array of bytes of specified length from the specified position of source to the buffer applying the offset. If the number of bytes requested cannot be read, all the possible bytes will be read to the buffer, and the number of actually read bytes will be returned.- Specified by:
get
in interfaceIRandomAccessSource
- Parameters:
position
- the position in the RandomAccessSource to read frombytes
- output bufferoff
- offset into the output buffer where results will be placedlen
- the number of bytes to read- Returns:
- the number of bytes actually read, or -1 if the file is at EOF
- Throws:
IOException
- in case of any I/O error.
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length
public long length()Gets the length of the source Note: the length is determined when theRAFRandomAccessSource
is constructed. If the file length changes after construction, that change will not be reflected in this call.- Specified by:
length
in interfaceIRandomAccessSource
- Returns:
- the length of this source
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close
Closes the underlying RandomAccessFile- Specified by:
close
in interfaceIRandomAccessSource
- Throws:
IOException
- in case of any reading error.
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