Package com.itextpdf.text.io
Class FileChannelRandomAccessSource
java.lang.Object
com.itextpdf.text.io.FileChannelRandomAccessSource
- All Implemented Interfaces:
RandomAccessSource
A RandomAccessSource that is based on an underlying
FileChannel
. The entire channel will be mapped into memory for efficient reads.- Since:
- 5.3.5
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Field Summary
FieldsModifier and TypeFieldDescriptionprivate final FileChannel
The channel this source is based onprivate final MappedChannelRandomAccessSource
Tracks the actual mapping -
Constructor Summary
ConstructorsConstructorDescriptionFileChannelRandomAccessSource
(FileChannel channel) Constructs a newFileChannelRandomAccessSource
based on the specified FileChannel. -
Method Summary
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Field Details
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channel
The channel this source is based on -
source
Tracks the actual mapping
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Constructor Details
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FileChannelRandomAccessSource
Constructs a newFileChannelRandomAccessSource
based on the specified FileChannel. The entire source channel will be mapped into memory.- Parameters:
channel
- the channel to use as the backing store- Throws:
IOException
- if the channel cannot be opened or mapped
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Method Details
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close
Closes this source. The underlying data structure or source (if any) will also be closed Cleans the mapped bytebuffers and closes the channel- Specified by:
close
in interfaceRandomAccessSource
- Throws:
IOException
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get
Gets a byte at the specified position- Specified by:
get
in interfaceRandomAccessSource
- Parameters:
position
-- Returns:
- the byte, or -1 if EOF is reached
- Throws:
IOException
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get
Gets an array at the specified position. If the number of bytes requested cannot be read, the bytes that can be read will be placed in bytes and the number actually read will be returned.- Specified by:
get
in interfaceRandomAccessSource
- 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
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length
public long length()- Specified by:
length
in interfaceRandomAccessSource
- Returns:
- the length of this source
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