Package org.apache.lucene.store

Class ChecksumIndexInput

java.lang.Object

org.apache.lucene.store.DataInput

org.apache.lucene.store.IndexInput

org.apache.lucene.store.ChecksumIndexInput

All Implemented Interfaces:

Closeable, AutoCloseable, Cloneable

Direct Known Subclasses:

BufferedChecksumIndexInput

public abstract class ChecksumIndexInput
extends IndexInput

Extension of IndexInput, computing checksum as it goes. Callers can retrieve the checksum via getChecksum().

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	ChecksumIndexInput(String resourceDescription)	resourceDescription should be a non-null, opaque string describing this resource; it's returned from IndexInput.toString().

Method Summary

Modifier and Type	Method	Description
abstract long	getChecksum()	Returns the current checksum value
void	seek(long pos)	Sets current position in this file, where the next read will occur.

Methods inherited from class org.apache.lucene.store.IndexInput

clone, close, getFilePointer, getFullSliceDescription, length, randomAccessSlice, skipBytes, slice, toString

Methods inherited from class org.apache.lucene.store.DataInput

readByte, readBytes, readBytes, readFloats, readInt, readLong, readLongs, readMapOfStrings, readSetOfStrings, readShort, readString, readVInt, readVLong, readZInt, readZLong

Methods inherited from class java.lang.Object

equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

Constructor Details

ChecksumIndexInput

protected ChecksumIndexInput(String resourceDescription)

resourceDescription should be a non-null, opaque string describing this resource; it's returned from IndexInput.toString().

Method Details

getChecksum

public abstract long getChecksum()
                          throws IOException

Returns the current checksum value

Throws:

IOException

seek

public void seek(long pos)
          throws IOException

Sets current position in this file, where the next read will occur. If this is beyond the end of the file then this will throw EOFException and then the stream is in an undetermined state.

ChecksumIndexInput can only seek forward and seeks are expensive since they imply to read bytes in-between the current position and the target position in order to update the checksum.

Specified by:

seek in class IndexInput

Throws:

IOException

See Also:

• IndexInput.getFilePointer()