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java.lang.Objectjava.io.InputStream
org.openstreetmap.osmosis.core.store.BufferedRandomAccessFileInputStream
public class BufferedRandomAccessFileInputStream
Wraps a random access file adding buffered input stream capabilities. This allows a file to be randomly accessed while providing performance improvements over the non-buffered random access file implementation.
Constructor Summary | |
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BufferedRandomAccessFileInputStream(java.io.File file)
Creates a new instance. |
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BufferedRandomAccessFileInputStream(java.io.File file,
int bufferCount,
int initialBufferSize,
int maxBufferSize,
float bufferIncreaseFactor)
Creates a new instance. |
Method Summary | |
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void |
close()
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long |
length()
Returns the length of the data file. |
long |
position()
Returns the current read position in the data file. |
int |
read()
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int |
read(byte[] b)
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int |
read(byte[] b,
int off,
int len)
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void |
seek(long pos)
Seeks to the specified position in the file. |
Methods inherited from class java.io.InputStream |
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available, mark, markSupported, reset, skip |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public BufferedRandomAccessFileInputStream(java.io.File file) throws java.io.FileNotFoundException
file
- The file to be read.
java.io.FileNotFoundException
- if the file cannot be opened.public BufferedRandomAccessFileInputStream(java.io.File file, int bufferCount, int initialBufferSize, int maxBufferSize, float bufferIncreaseFactor) throws java.io.FileNotFoundException
file
- The file to be read.bufferCount
- The number of buffers to use. Use of multiple buffers allows
some random seeks to occur without losing existing buffered
data that might be returned to.initialBufferSize
- After a seek, this is the number of bytes that will be
initially read.maxBufferSize
- This is the maximum number of bytes that will ever be read
from the underlying file at a time.bufferIncreaseFactor
- During sequential reads, if the buffer is exhausted the next
read will be longer than the previous read according to this
factor. A value of 1 means the buffer never gets larger. The
buffer will never get larger than maxBufferSize.
java.io.FileNotFoundException
- if the file cannot be opened.Method Detail |
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public int read() throws java.io.IOException
read
in class java.io.InputStream
java.io.IOException
public int read(byte[] b) throws java.io.IOException
read
in class java.io.InputStream
java.io.IOException
public int read(byte[] b, int off, int len) throws java.io.IOException
read
in class java.io.InputStream
java.io.IOException
public void seek(long pos) throws java.io.IOException
pos
- The position within the file to seek to.
java.io.IOException
- if an error occurs during seeking.public long length() throws java.io.IOException
java.io.IOException
- if an error occurs during the length operation.public long position() throws java.io.IOException
java.io.IOException
- if an error occurs during the position operation.public void close() throws java.io.IOException
close
in interface java.io.Closeable
close
in class java.io.InputStream
java.io.IOException
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