ChecksumIndexInput (Lucene 9.12.3 core API)

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

All Methods Instance Methods Abstract Methods Concrete Methods
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, readGroupVInt, readGroupVInts, readInt, readInts, 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 Detail
  - ChecksumIndexInput
```
protected ChecksumIndexInput(String resourceDescription)
```
    resourceDescription should be a non-null, opaque string describing this resource; it's returned from IndexInput.toString().
- Method Detail
  - 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()