org.jclarion.clarion.runtime.expr
Class LabelExpr

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

public class LabelExpr
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

LabelExpr(java.lang.String name)

LabelExpr(java.lang.String name, java.util.List<CExpr> params)

Method Summary

void	cast(CExprType type) Force expr type to a new cast
java.util.Iterator<CExpr>	directChildren()
ClarionObject	eval() Generate result
boolean	generateString(java.lang.StringBuilder out, boolean strict) Generate SQL capable string.
java.lang.String	getName()
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

LabelExpr

public LabelExpr(java.lang.String name)

LabelExpr

public LabelExpr(java.lang.String name,
                 java.util.List<CExpr> params)

Method Detail

getName

public java.lang.String getName()

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)

Description copied from class: CExpr

Generate SQL capable string. if strict is false (not strict mode) then it will generate expression faithfully without consideration as to whether or not it will yield legal SQL If strict mode is set - then only faithful SQL will be yielded return result in this case will indicate whether or not this call of generateString yielded SQL. If a method returns false it must preserve StringBuilder as is e.g. Pow() will always return false. e.g. BoolExpr will return false if there are any 'OR' components which are not strict SQL

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