org.jclarion.clarion.runtime.expr
Class BoolExpr

java.lang.Object
  org.jclarion.clarion.runtime.expr.CExpr
      org.jclarion.clarion.runtime.expr.BoolExpr

public class BoolExpr
extends CExpr

Nested Class Summary

Nested classes/interfaces inherited from class org.jclarion.clarion.runtime.expr.CExpr

CExpr.DeepIterator, CExpr.GenericOp, CExpr.JoinIterator, CExpr.OneIterator, CExpr.OpIterable, CExpr.OpIterator, CExpr.TwoIterator, CExpr.ZeroIterator

Constructor Summary

BoolExpr(CExpr base)

Method Summary

void	add(java.lang.String op, CExpr right)
void	cast(CExprType type) Force expr type to a new cast
static CExpr	construct(CExpr left, java.lang.String op, CExpr right)
java.util.Iterator<CExpr>	directChildren()
ClarionObject	eval() Generate result
boolean	generateString(java.lang.StringBuilder out, boolean strict) In strict mode - we are not allowed to generate SQL if either side of an OR expression is not strict too.
CExprType	getType() Work out expression type
boolean	isRecastableType() Return whether or not expression type is fixed.
int	precendence() Return order of precendence.

Methods inherited from class org.jclarion.clarion.runtime.expr.CExpr

cast, isRecastableType, iterator, resolveCasts

Methods inherited from class java.lang.Object

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

Constructor Detail

BoolExpr

public BoolExpr(CExpr base)

Method Detail

construct

public static CExpr construct(CExpr left,
                              java.lang.String op,
                              CExpr right)

add

public void add(java.lang.String op,
                CExpr right)

eval

public ClarionObject eval()

Description copied from class: CExpr

Generate result

Specified by:

eval in class CExpr

Returns:

precendence

public int precendence()

Description copied from class: CExpr

Return order of precendence. Low number = low order of precedence (i.e. bool etc) Hi number = high order of precendence (i.e. * % / etc ). Highest is constants When rebuilding expressions (i.e. SQL) you need to paran anything whose precendence is lower then yourself i.e. Sum(Prod,Prod) = 2*3 + 6*3 Prod(Sum,Sum) = (2+3) * (6+3)

Specified by:

precendence in class CExpr

directChildren

public java.util.Iterator<CExpr> directChildren()

Specified by:

directChildren in class CExpr

generateString

public boolean generateString(java.lang.StringBuilder out,
                              boolean strict)

In strict mode - we are not allowed to generate SQL if either side of an OR expression is not strict too. but everything else is ok. ie following scenarios are ok S1 AND C2 AND S3 * S1 AND S3 S1 OR C2 AND S3 * S3 C1 OR S2 AND S3 * S3 C1 OR S2 AND S3 OR C4 *

Specified by:

generateString in class CExpr

cast

public void cast(CExprType type)

Description copied from class: CExpr

Force expr type to a new cast

Specified by:

cast in class CExpr

getType

public CExprType getType()

Description copied from class: CExpr

Work out expression type

Specified by:

getType in class CExpr

Returns:

isRecastableType

public boolean isRecastableType()

Description copied from class: CExpr

Return whether or not expression type is fixed. i.e. cannot be easily recast

Specified by:

isRecastableType in class CExpr