org.datanucleus.query.expression

Class InvokeExpression

java.lang.Object

org.datanucleus.query.expression.Expression

org.datanucleus.query.expression.InvokeExpression

All Implemented Interfaces:

Serializable

public class InvokeExpression
extends Expression

Expression representing invocation of a method. This may be an aggregate in a result clause (like "count(this)"), or a method on a class, or a function. The "left" expression is what we are invoking on. This is typically a PrimaryExpression, or an InvokeExpression. This then allows chaining of invocations.

See Also:

Serialized Form

Nested Class Summary

Nested classes/interfaces inherited from class org.datanucleus.query.expression.Expression

Expression.DyadicOperator, Expression.MonadicOperator, Expression.Operator

Field Summary

Fields inherited from class org.datanucleus.query.expression.Expression

alias, left, op, OP_ADD, OP_AND, OP_BIT_AND, OP_BIT_OR, OP_BIT_XOR, OP_CAST, OP_COM, OP_CONCAT, OP_DISTINCT, OP_DIV, OP_EQ, OP_GT, OP_GTEQ, OP_IN, OP_IS, OP_ISNOT, OP_LIKE, OP_LT, OP_LTEQ, OP_MOD, OP_MUL, OP_NEG, OP_NOT, OP_NOTEQ, OP_NOTIN, OP_OR, OP_SUB, parent, right, symbol

Constructor Summary

Constructors

Constructor and Description
InvokeExpression(Expression invoked, String methodName, List<Expression> args) Constructor for an expression for the invocation of a method/function.

Method Summary

Modifier and Type	Method and Description
Symbol	bind(SymbolTable symtbl) Method to bind the expression to the symbol table as appropriate.
List<Expression>	getArguments() Accessor for any arguments to be passed in the invocation.
String	getOperation() The method/function invoked.
String	toString() Method to return the string form of this expression.
String	toStringWithoutAlias() Method to return the string form of this without the alias component.

Methods inherited from class org.datanucleus.query.expression.Expression

evaluate, getAlias, getLeft, getOperator, getParent, getRight, getSymbol, setAlias, setLeft, setRight

Methods inherited from class java.lang.Object

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

Constructor Detail

InvokeExpression

public InvokeExpression(Expression invoked,
                        String methodName,
                        List<Expression> args)

Constructor for an expression for the invocation of a method/function.

Parameters:

invoked - Expression on which we are invoking

methodName - Name of the method

args - Arguments passed in to the method/function call

Method Detail

getOperation

public String getOperation()

The method/function invoked.

Returns:

The method/function invoked.

getArguments

public List<Expression> getArguments()

Accessor for any arguments to be passed in the invocation.

Returns:

The arguments.

bind

public Symbol bind(SymbolTable symtbl)

Method to bind the expression to the symbol table as appropriate.

Specified by:

bind in class Expression

Parameters:

symtbl - Symbol table

Returns:

The symbol for this expression

toStringWithoutAlias

public String toStringWithoutAlias()

Method to return the string form of this without the alias component. This is useful when we want to compare expressions in a query compile, and the alias is not important to the comparison. Returns a String of the form "InvokeExpression{[left].methodName(args)}" or "InvokeExpression{STATIC.methodName(args)}".

Returns:

The string form

toString

public String toString()

Method to return the string form of this expression. Returns a String of the form "InvokeExpression{[left].methodName(args)} AS alias" or "InvokeExpression{STATIC.methodName(args)} AS alias". where it only adds the "AS alias" when the alias is non-null.

Overrides:

toString in class Object

Returns:

The string form