org.apache.cassandra.cql3.functions

Class AbstractFunction

java.lang.Object

org.apache.cassandra.cql3.functions.AbstractFunction

All Implemented Interfaces:

AssignmentTestable, Function

Direct Known Subclasses:

NativeFunction, UDAggregate, UDFunction

public abstract class AbstractFunction
extends java.lang.Object
implements Function

Base class for our native/hardcoded functions.

Nested Class Summary

Nested classes/interfaces inherited from interface org.apache.cassandra.cql3.AssignmentTestable

AssignmentTestable.TestResult

Field Summary

Fields

Modifier and Type	Field and Description
protected java.util.List<AbstractType<?>>	argTypes
protected FunctionName	name
protected AbstractType<?>	returnType

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	AbstractFunction(FunctionName name, java.util.List<AbstractType<?>> argTypes, AbstractType<?> returnType)

Method Summary

Modifier and Type	Method and Description
void	addFunctionsTo(java.util.List<Function> functions)
java.util.List<AbstractType<?>>	argTypes()
boolean	equals(java.lang.Object o)
int	hashCode()
boolean	hasReferenceTo(Function function)
FunctionName	name()
AbstractType<?>	returnType()
AssignmentTestable.TestResult	testAssignment(java.lang.String keyspace, ColumnSpecification receiver)
java.lang.String	toString()

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface org.apache.cassandra.cql3.functions.Function

isAggregate, isNative

Field Detail

name

protected final FunctionName name

argTypes

protected final java.util.List<AbstractType<?>> argTypes

returnType

protected final AbstractType<?> returnType

Constructor Detail

AbstractFunction

protected AbstractFunction(FunctionName name,
                           java.util.List<AbstractType<?>> argTypes,
                           AbstractType<?> returnType)

Method Detail

name

public FunctionName name()

Specified by:

name in interface Function

argTypes

public java.util.List<AbstractType<?>> argTypes()

Specified by:

argTypes in interface Function

returnType

public AbstractType<?> returnType()

Specified by:

returnType in interface Function

equals

public boolean equals(java.lang.Object o)

Overrides:

equals in class java.lang.Object

addFunctionsTo

public void addFunctionsTo(java.util.List<Function> functions)

Specified by:

addFunctionsTo in interface Function

hasReferenceTo

public boolean hasReferenceTo(Function function)

Specified by:

hasReferenceTo in interface Function

hashCode

public int hashCode()

Overrides:

hashCode in class java.lang.Object

testAssignment

public final AssignmentTestable.TestResult testAssignment(java.lang.String keyspace,
                                                          ColumnSpecification receiver)

Specified by:

testAssignment in interface AssignmentTestable

Returns:

whether this object can be assigned to the provided receiver. We distinguish between 3 values: - EXACT_MATCH if this object is exactly of the type expected by the receiver - WEAKLY_ASSIGNABLE if this object is not exactly the expected type but is assignable nonetheless - NOT_ASSIGNABLE if it's not assignable Most caller should just call the isAssignable() method on the result, though functions have a use for testing "strong" equality to decide the most precise overload to pick when multiple could match.

toString

public java.lang.String toString()

Overrides:

toString in class java.lang.Object