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java.lang.Objectorg.ka2ddo.yaac.io.MultiBufferedRandomAccessFile
public final class MultiBufferedRandomAccessFile
This class provides a cached, buffered variant of RandomAccessFile, so that sequential reads from a starting point can be done with minimal JNI calls and actual kernel calls. It also supports multiple buffers for Ways with "fixed" vertices that are out of sequence with the other vertices.
Constructor Summary | |
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MultiBufferedRandomAccessFile(java.io.File file,
int bufSize,
int maxBuffers)
Create a read-only random access file with the specified maximum number of buffers of the specified size. |
Method Summary | |
---|---|
void |
clearCache()
Clear the cache buffers. |
void |
close()
Closes this file and releases any system resources associated with the buffering. |
int |
read()
Reads the next byte in the file at the current seek position. |
boolean |
readBoolean()
See the general contract of the readBoolean
method of DataInput . |
byte |
readByte()
See the general contract of the readByte
method of DataInput . |
char |
readChar()
See the general contract of the readChar
method of DataInput . |
double |
readDouble()
See the general contract of the readDouble
method of DataInput . |
float |
readFloat()
See the general contract of the readFloat
method of DataInput . |
void |
readFully(byte[] b)
See the general contract of the readFully
method of DataInput . |
void |
readFully(byte[] b,
int off,
int len)
See the general contract of the readFully
method of DataInput . |
int |
readInt()
See the general contract of the readInt
method of DataInput . |
java.lang.String |
readLine()
See the general contract of the readLine
method of DataInput . |
long |
readLong()
See the general contract of the readLong
method of DataInput . |
int |
readNextInt()
This is similar to readInt(), but the caller must guarantee that no seek() occurred between the last call to readInt() or readNextInt() and this one. |
short |
readShort()
See the general contract of the readShort
method of DataInput . |
int |
readUnsignedByte()
See the general contract of the readUnsignedByte
method of DataInput . |
int |
readUnsignedShort()
See the general contract of the readUnsignedShort
method of DataInput . |
java.lang.String |
readUTF()
See the general contract of the readUTF
method of DataInput . |
void |
resetStatistics()
Reset the statistics counters that are reported by the toString() method. |
void |
seek(long seekPos)
Sets the file-pointer offset, measured from the beginning of this file, at which the next read occurs. |
int |
skipBytes(int n)
See the general contract of the skipBytes
method of DataInput . |
java.lang.String |
toString()
Returns a string representation of the object. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait |
Constructor Detail |
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public MultiBufferedRandomAccessFile(java.io.File file, int bufSize, int maxBuffers) throws java.io.IOException
file
- File pointing at the disk file to readbufSize
- size of each buffer in bytes (must be a power of 2)maxBuffers
- maximum number of buffers to use
java.io.IOException
- if file cannot be opened for read-only accessMethod Detail |
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public int read() throws java.io.IOException
-1
if the end of the
stream is reached.
java.io.IOException
- if this input stream has been closed by
invoking its close()
method,
or an I/O error occurs.seek(long)
public boolean readBoolean() throws java.io.IOException
readBoolean
method of DataInput
.
Bytes for this operation are read from the contained file.
readBoolean
in interface java.io.DataInput
boolean
value read.
java.io.EOFException
- if this input stream has reached the end.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public byte readByte() throws java.io.IOException
readByte
method of DataInput
.
Bytes for this operation are read from the contained file.
readByte
in interface java.io.DataInput
byte
.
java.io.EOFException
- if this input stream has reached the end.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public char readChar() throws java.io.IOException
readChar
method of DataInput
.
Bytes for this operation are read from the contained input stream.
readChar
in interface java.io.DataInput
char
.
java.io.EOFException
- if this input stream reaches the end before
reading two bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public double readDouble() throws java.io.IOException
readDouble
method of DataInput
.
Bytes for this operation are read from the contained file.
readDouble
in interface java.io.DataInput
double
.
java.io.EOFException
- if this input stream reaches the end before
reading eight bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.DataInputStream.readLong()
,
Double.longBitsToDouble(long)
public float readFloat() throws java.io.IOException
readFloat
method of DataInput
.
Bytes for this operation are read from the contained file.
readFloat
in interface java.io.DataInput
float
.
java.io.EOFException
- if this input stream reaches the end before
reading four bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.DataInputStream.readInt()
,
Float.intBitsToFloat(int)
public void readFully(byte[] b) throws java.io.IOException
readFully
method of DataInput
.
Bytes for this operation are read from the contained file.
readFully
in interface java.io.DataInput
b
- the buffer into which the data is read.
java.io.EOFException
- if this input stream reaches the end before
reading all the bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public void readFully(byte[] b, int off, int len) throws java.io.IOException
readFully
method of DataInput
.
Bytes for this operation are read from the contained file.
readFully
in interface java.io.DataInput
b
- the buffer into which the data is read.off
- the start offset of the data.len
- the number of bytes to read.
java.io.EOFException
- if this input stream reaches the end before
reading all the bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public int readInt() throws java.io.IOException
readInt
method of DataInput
.
Bytes for this operation are read from the contained file.
readInt
in interface java.io.DataInput
int
.
java.io.EOFException
- if this input stream reaches the end before
reading four bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public java.lang.String readLine() throws java.io.IOException
readLine
method of DataInput
.
Bytes for this operation are read from the contained file. Note that this method only supports extended 8-bit ASCII; it does not support UTF-8 or other locale-specific character sets.
readLine
in interface java.io.DataInput
java.io.IOException
- if an I/O error occurs.public long readLong() throws java.io.IOException
readLong
method of DataInput
.
Bytes for this operation are read from the contained file.
readLong
in interface java.io.DataInput
long
.
java.io.EOFException
- if this input stream reaches the end before
reading eight bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public short readShort() throws java.io.IOException
readShort
method of DataInput
.
Bytes for this operation are read from the contained file.
readShort
in interface java.io.DataInput
java.io.EOFException
- if this input stream reaches the end before
reading two bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public int readUnsignedByte() throws java.io.IOException
readUnsignedByte
method of DataInput
.
Bytes for this operation are read from the contained file.
readUnsignedByte
in interface java.io.DataInput
java.io.EOFException
- if this input stream has reached the end.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public int readUnsignedShort() throws java.io.IOException
readUnsignedShort
method of DataInput
.
Bytes for this operation are read from the contained file.
readUnsignedShort
in interface java.io.DataInput
java.io.EOFException
- if this input stream reaches the end before
reading two bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.public java.lang.String readUTF() throws java.io.IOException
readUTF
method of DataInput
.
Bytes for this operation are read from the contained file.
readUTF
in interface java.io.DataInput
java.io.EOFException
- if this input stream reaches the end before
reading all the bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.
java.io.UTFDataFormatException
- if the bytes do not represent a valid
modified UTF-8 encoding of a string.public int skipBytes(int n) throws java.io.IOException
skipBytes
method of DataInput
.
Bytes for this operation are read from the contained file.
skipBytes
in interface java.io.DataInput
n
- the number of bytes to be skipped.
java.io.IOException
- if the contained input stream does not support
seek, or the stream has been closed and
the contained input stream does not support
reading after close, or another I/O error occurs.public void seek(long seekPos)
seekPos
- the offset position, measured in bytes from the
beginning of the file, at which to set the file
pointer.public void close() throws java.io.IOException
close
in interface java.io.Closeable
java.io.IOException
- if an I/O error occurs.public java.lang.String toString()
toString
in class java.lang.Object
public void resetStatistics()
toString()
public int readNextInt() throws java.io.IOException
int
.
java.io.EOFException
- if this input stream reaches the end before
reading four bytes.
java.io.IOException
- the stream has been closed and the contained
input stream does not support reading after close, or
another I/O error occurs.readInt()
public void clearCache()
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