org.tentackle.persist.wurblet

Class WurbletArgumentExpression

java.lang.Object

org.tentackle.persist.wurblet.WurbletArgumentExpression

All Implemented Interfaces:

WurbletArgumentOperand

public class WurbletArgumentExpression
extends Object
implements WurbletArgumentOperand

An expression of wurblet arguments or other expressions.

Author:

harald

Constructor Summary

Constructors

Constructor and Description
WurbletArgumentExpression(WurbletArgumentExpression parent) Creates a new expression.

Method Summary

Modifier and Type	Method and Description
WurbletArgumentOperator	addOperand(WurbletArgumentOperator operator, WurbletArgumentOperand operand) Adds an operand.
List<JoinPath>	getMergedPaths() Gets the paths for wurblet arguments which can be expressed in a single SQL EXISTS clause. The returned list is empty, if there are no paths at all or each argument needs its own EXISTS clause.
List<WurbletArgumentOperand>	getOperands() Gets the n operands.
List<WurbletArgumentOperator>	getOperators() Gets the n-1 operators.
WurbletArgumentExpression	getParent() Gets the parent expression.
boolean	needParenthesesAfterAndOperator() Returns whether expression must be enclosed in parentheses after an AND operator.
String	toCode(CodeGenerator<Object> generator) Generates the code.
String	toString()

Methods inherited from class java.lang.Object

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

Constructor Detail

WurbletArgumentExpression

public WurbletArgumentExpression(WurbletArgumentExpression parent)

Creates a new expression.

Parameters:

parent - optional parent expression, null if this is the top level expression

Method Detail

getParent

public WurbletArgumentExpression getParent()

Gets the parent expression.

Returns:

the parent, null if top level

getOperands

public List<WurbletArgumentOperand> getOperands()

Gets the n operands.

Returns:

the operands

getOperators

public List<WurbletArgumentOperator> getOperators()

Gets the n-1 operators.

Returns:

the operators

getMergedPaths

public List<JoinPath> getMergedPaths()

Gets the paths for wurblet arguments which can be expressed in a single SQL EXISTS clause.
The returned list is empty, if there are no paths at all or each argument needs its own EXISTS clause.

Returns:

the paths, empty if none, never null

addOperand

public WurbletArgumentOperator addOperand(WurbletArgumentOperator operator,
                                          WurbletArgumentOperand operand)
                                   throws org.wurbelizer.wurbel.WurbelException

Adds an operand.

Parameters:

operator - the operator, null defaults to ADD

operand - the operand

Returns:

the operator, null if start of expression

Throws:

org.wurbelizer.wurbel.WurbelException - if failed

needParenthesesAfterAndOperator

public boolean needParenthesesAfterAndOperator()

Returns whether expression must be enclosed in parentheses after an AND operator.

Returns:

true need parentheses

toCode

public String toCode(CodeGenerator<Object> generator)
              throws org.wurbelizer.wurbel.WurbelException

Generates the code.

Parameters:

generator - the code generator

Returns:

the generated code

Throws:

org.wurbelizer.wurbel.WurbelException - if code generation failed

toString

public String toString()

Overrides:

toString in class Object