org.expressionj.model

Class AbstractExpression

java.lang.Object

org.expressionj.model.AbstractExpression

All Implemented Interfaces:

java.lang.Cloneable, Expression, ExpressionType

Direct Known Subclasses:

AbstractAryExpression, AbstractExprFunction, AbstractUnaryExpression, AbstractValue, ExprArray, ExprDecrement, ExprIncrement

public abstract class AbstractExpression
extends java.lang.Object
implements Expression

An abstract expression contains eval() methods which cefault to Expression.eval().

Field Summary

Fields

Modifier and Type	Field and Description
protected CodeBlock	block
protected Expression	root

Fields inherited from interface org.expressionj.model.ExpressionType

STRUCT_ARRAY, STRUCT_SCALAR, STRUCT_STRUCTURE, TYPE_BOOL, TYPE_DYNAMIC, TYPE_FLOAT, TYPE_INTEGER, TYPE_NUMERIC, TYPE_STRING, TYPE_UNDEF

Constructor Summary

Constructors

Constructor and Description
AbstractExpression()
AbstractExpression(Expression root)

Method Summary

Modifier and Type	Method and Description
abstract java.lang.Object	clone()
boolean	evalAsBoolean() Evaluate the expression as a boolean.
float	evalAsFloat() Evaluate the expression as a float.
int	evalAsInt() Evaluate the expression as an int.
CodeBlock	getParentBlock() Return the parent expression block if the expression is one of several expressions separated by commas.
Expression	getRoot() Return the root expression.
void	setParentBlock(CodeBlock block) Set the parent expression block.
void	setRoot(Expression root) Set the root expression.

Methods inherited from class java.lang.Object

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

Methods inherited from interface org.expressionj.model.Expression

eval, getExpression, getExpressionName, getLocalVariable, getLocalVariables, getResultStructure, getResultType, getVariable, getVariable, getVariables, getVariables, hasVariable, hasVariable, removeVariable

Field Detail

block

protected CodeBlock block

root

protected Expression root

Constructor Detail

AbstractExpression

public AbstractExpression()

AbstractExpression

public AbstractExpression(Expression root)

Method Detail

setRoot

public void setRoot(Expression root)

Set the root expression.

Parameters:

root - the root expression

clone

public abstract java.lang.Object clone()
                                throws java.lang.CloneNotSupportedException

Specified by:

clone in interface Expression

Overrides:

clone in class java.lang.Object

Throws:

java.lang.CloneNotSupportedException

setParentBlock

public void setParentBlock(CodeBlock block)

Description copied from interface: Expression

Set the parent expression block.

Specified by:

setParentBlock in interface Expression

Parameters:

block - the parent expression block

getParentBlock

public CodeBlock getParentBlock()

Description copied from interface: Expression

Return the parent expression block if the expression is one of several expressions separated by commas. For example, in the following equation: b=a+2; return b, the two "b=a+2" and "return b" have "b=a+2; return b" as their parent block.

Specified by:

getParentBlock in interface Expression

Returns:

the parent expression block

getRoot

public Expression getRoot()

Return the root expression.

Specified by:

getRoot in interface Expression

Returns:

the root expression

evalAsInt

public int evalAsInt()

Description copied from interface: Expression

Evaluate the expression as an int. The result of the evaluation will be the same as Expression.eval(), but the evaluation engine will be able to optimize the computation by knwoing that the result is an int (primitive valeus are cached internally).

Specified by:

evalAsInt in interface Expression

Returns:

the result as an int

evalAsFloat

public float evalAsFloat()

Description copied from interface: Expression

Evaluate the expression as a float. The result of the evaluation will be the same as Expression.eval(), but the evaluation engine will be able to optimize the computation by knwoing that the result is a float (primitive valeus are cached internally).

Specified by:

evalAsFloat in interface Expression

Returns:

the result as a float

evalAsBoolean

public boolean evalAsBoolean()

Description copied from interface: Expression

Evaluate the expression as a boolean. The result of the evaluation will be the same as Expression.eval(), but the evaluation engine will be able to optimize the computation by knwoing that the result is a boolean (primitive valeus are cached internally).

Specified by:

evalAsBoolean in interface Expression

Returns:

the result as a boolean