org.apache.cassandra.cql3
Class Lists.Discarder

java.lang.Object
  org.apache.cassandra.cql3.Operation
      org.apache.cassandra.cql3.Lists.Discarder

Enclosing class:

Lists

public static class Lists.Discarder
extends Operation

Nested Class Summary

Nested classes/interfaces inherited from class org.apache.cassandra.cql3.Operation

Operation.Addition, Operation.ColumnDeletion, Operation.ElementDeletion, Operation.Prepend, Operation.RawDeletion, Operation.RawUpdate, Operation.SetElement, Operation.SetValue, Operation.Substraction

Field Summary

Fields inherited from class org.apache.cassandra.cql3.Operation

columnName, t

Constructor Summary

Lists.Discarder(ColumnIdentifier column, Term t)

Method Summary

void	execute(java.nio.ByteBuffer rowKey, ColumnFamily cf, ColumnNameBuilder prefix, UpdateParameters params) Execute the operation.
boolean	requiresRead()

Methods inherited from class org.apache.cassandra.cql3.Operation

collectMarkerSpecification

Methods inherited from class java.lang.Object

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

Constructor Detail

Lists.Discarder

public Lists.Discarder(ColumnIdentifier column,
                       Term t)

Method Detail

requiresRead

public boolean requiresRead()

Overrides:

requiresRead in class Operation

Returns:

whether the operation requires a read of the previous value to be executed (only lists setterByIdx, discard and discardByIdx requires that).

execute

public void execute(java.nio.ByteBuffer rowKey,
                    ColumnFamily cf,
                    ColumnNameBuilder prefix,
                    UpdateParameters params)
             throws InvalidRequestException

Description copied from class: Operation

Execute the operation.

Specified by:

execute in class Operation

Parameters:

rowKey - row key for the update.

cf - the column family to which to add the updates generated by this operation.

prefix - the prefix that identify the CQL3 row this operation applies to (callers should not reuse the ColumnNameBuilder they pass here).

params - parameters of the update.

Throws:

InvalidRequestException