Operation (apache-cassandra API)

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.ElementDiscarder, Sets.Setter, UserTypes.DeleterByField, UserTypes.Setter, UserTypes.SetterByField
```
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

Nested Classes
Modifier and Type	Class	Description
`static class`	`Operation.Addition`
`static class`	`Operation.ColumnDeletion`
`static class`	`Operation.ElementDeletion`
`static class`	`Operation.FieldDeletion`
`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.SetField`
`static class`	`Operation.SetValue`
`static class`	`Operation.Substraction`

Field Summary

Fields
Modifier and Type Field Description

ColumnMetadata column

protected Term t

Constructor Summary

Constructors
Modifier Constructor Description

protected Operation(ColumnMetadata column, Term t)

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`addFunctionsTo(java.util.List<Function> functions)`
`void`	`collectMarkerSpecification(VariableSpecifications boundNames)`	Collects the column specification for the bind variables of this operation.
`abstract void`	`execute(DecoratedKey partitionKey, 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
  - column
```
public final ColumnMetadata column
```
  - t
```
protected final Term t
```
- Constructor Detail
  - Operation
```
protected Operation(ColumnMetadata column,
                    Term t)
```
- Method Detail
  - addFunctionsTo
```
public void addFunctionsTo(java.util.List<Function> functions)
```
  - 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(VariableSpecifications 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(DecoratedKey partitionKey,
                             UpdateParameters params)
                      throws InvalidRequestException
```
    Execute the operation.
    
    Parameters:
    
    partitionKey - partition key for the update.
    
    params - parameters of the update.
    
    Throws:
    
    InvalidRequestException