Package com.itextpdf.text.io
Class WindowRandomAccessSource
- java.lang.Object
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- com.itextpdf.text.io.WindowRandomAccessSource
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- All Implemented Interfaces:
RandomAccessSource
public class WindowRandomAccessSource extends java.lang.Object implements RandomAccessSource
A RandomAccessSource that wraps another RandomAccessSouce and provides a window of it at a specific offset and over a specific length. Position 0 becomes the offset position in the underlying source.- Since:
- 5.3.5
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Field Summary
Fields Modifier and Type Field Description private long
length
The lengthprivate long
offset
The amount to offset the source byprivate RandomAccessSource
source
The source
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Constructor Summary
Constructors Constructor Description WindowRandomAccessSource(RandomAccessSource source, long offset)
Constructs a new OffsetRandomAccessSource that extends to the end of the underlying sourceWindowRandomAccessSource(RandomAccessSource source, long offset, long length)
Constructs a new OffsetRandomAccessSource with an explicit length
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Method Summary
All Methods Instance Methods Concrete Methods Modifier and Type Method Description void
close()
Closes this source.int
get(long position)
Gets a byte at the specified positionint
get(long position, byte[] bytes, int off, int len)
Gets an array at the specified position.long
length()
Note that the length will be adjusted to read from the corrected location in the underlying source
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Field Detail
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source
private final RandomAccessSource source
The source
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offset
private final long offset
The amount to offset the source by
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length
private final long length
The length
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Constructor Detail
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WindowRandomAccessSource
public WindowRandomAccessSource(RandomAccessSource source, long offset)
Constructs a new OffsetRandomAccessSource that extends to the end of the underlying source- Parameters:
source
- the sourceoffset
- the amount of the offset to use
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WindowRandomAccessSource
public WindowRandomAccessSource(RandomAccessSource source, long offset, long length)
Constructs a new OffsetRandomAccessSource with an explicit length- Parameters:
source
- the sourceoffset
- the amount of the offset to uselength
- the number of bytes to be included in this RAS
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Method Detail
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get
public int get(long position) throws java.io.IOException
Gets a byte at the specified position Note that the position will be adjusted to read from the corrected location in the underlying source- Specified by:
get
in interfaceRandomAccessSource
- Returns:
- the byte, or -1 if EOF is reached
- Throws:
java.io.IOException
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get
public int get(long position, byte[] bytes, int off, int len) throws java.io.IOException
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. Note that the position will be adjusted to read from the corrected location in the underlying source- 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:
java.io.IOException
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length
public long length()
Note that the length will be adjusted to read from the corrected location in the underlying source- Specified by:
length
in interfaceRandomAccessSource
- Returns:
- the length of this source
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close
public void close() throws java.io.IOException
Closes this source. The underlying data structure or source (if any) will also be closed- Specified by:
close
in interfaceRandomAccessSource
- Throws:
java.io.IOException
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