org.apache.cassandra.cql3
Class Operation

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

Direct Known Subclasses:

Constants.Adder, Constants.Deleter, Constants.Setter, Constants.Substracter, Lists.Appender, Lists.Discarder, Lists.DiscarderByIndex, Lists.Prepender, Lists.Setter, Lists.SetterByIndex, Maps.DiscarderByKey, Maps.Putter, Maps.Setter, Maps.SetterByKey, Sets.Adder, Sets.Discarder, Sets.Setter

public abstract class Operation
extends java.lang.Object

An UPDATE or DELETE operation. For UPDATE this includes: - setting a constant - counter operations - collections operations and for DELETE: - deleting a column - deleting an element of collection column Fine grained operation are obtained from their raw counterpart (Operation.Raw, which correspond to a parsed, non-checked operation) by provided the receiver for the operation.

Nested Class Summary

static class	Operation.Addition
static class	Operation.ColumnDeletion
static class	Operation.ElementDeletion
static class	Operation.Prepend
static interface	Operation.RawDeletion A parsed raw DELETE operation.
static interface	Operation.RawUpdate A parsed raw UPDATE operation.
static class	Operation.SetElement
static class	Operation.SetValue
static class	Operation.Substraction

Field Summary

ColumnIdentifier	columnName
protected Term	t

Constructor Summary

protected

Operation(ColumnIdentifier columnName, Term t)

Method Summary

void	collectMarkerSpecification(ColumnSpecification[] boundNames) Collects the column specification for the bind variables of this operation.
abstract void	execute(java.nio.ByteBuffer rowKey, ColumnFamily cf, ColumnNameBuilder namePrefix, UpdateParameters params) Execute the operation.
boolean	requiresRead()

Methods inherited from class java.lang.Object

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

Field Detail

columnName

public final ColumnIdentifier columnName

t

protected final Term t

Constructor Detail

Operation

protected Operation(ColumnIdentifier columnName,
                    Term t)

Method Detail

requiresRead

public boolean requiresRead()

Returns:

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

collectMarkerSpecification

public void collectMarkerSpecification(ColumnSpecification[] boundNames)

Collects the column specification for the bind variables of this operation.

Parameters:

boundNames - the list of column specification where to collect the bind variables of this term in.

execute

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

Execute the operation.

Parameters:

rowKey - row key for the update.

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

namePrefix - 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