net.sf.jabb.util.exp

Class BooleanExpression

java.lang.Object

net.sf.jabb.util.exp.BooleanExpression

Direct Known Subclasses:

CompareExpression

public class BooleanExpression
extends Object

Logical expression that results in true or false.
产生true或false结果的逻辑表达式。

Author:

Zhengmao HU (James)

Field Summary

Fields

Modifier and Type	Field and Description
protected List<BooleanExpression>	children
static BooleanExpression	FALSE
protected static int	OPERAND
protected static int	OPERATOR_AND
protected static int	OPERATOR_NOT
protected static int	OPERATOR_OR
protected int	operatorType
static BooleanExpression	TRUE

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	BooleanExpression(int operatorType) 创建一个实例

Method Summary

Modifier and Type	Method and Description
void	addOperand(BooleanExpression... operands) 给表达式增加运算数
void	addOperand(BooleanExpression operand) 给表达式增加运算数
void	addOperand(Collection<? extends BooleanExpression> operands) 给表达式增加运算数
static BooleanExpression	AND(BooleanExpression... operands) 创建用AND连接的表达式
static BooleanExpression	AND(Collection<? extends BooleanExpression> operands) 创建用AND连接的表达式
boolean	evaluate() 用null作为context获得表达式的结果。子类不必重载这个方法。
boolean	evaluate(Object context) 获得表达式的结果。子类可以重载这个方法。
static BooleanExpression	HAS(Object obj)
static BooleanExpression	NOT(BooleanExpression operand) 创建用NOT修饰的表达式
static BooleanExpression	OR(BooleanExpression... operands) 创建用OR连接的表达式
static BooleanExpression	OR(Collection<? extends BooleanExpression> operands) 创建用OR连接的表达式
String	toString() 转成字符串表示。子类可以重载这个方法。

Methods inherited from class java.lang.Object

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

Field Detail

OPERATOR_AND

protected static final int OPERATOR_AND

See Also:

Constant Field Values

OPERATOR_OR

protected static final int OPERATOR_OR

See Also:

Constant Field Values

OPERATOR_NOT

protected static final int OPERATOR_NOT

See Also:

Constant Field Values

OPERAND

protected static final int OPERAND

See Also:

Constant Field Values

TRUE

public static final BooleanExpression TRUE

FALSE

public static final BooleanExpression FALSE

operatorType

protected int operatorType

children

protected List<BooleanExpression> children

Constructor Detail

BooleanExpression

protected BooleanExpression(int operatorType)

创建一个实例

Parameters:

operatorType -

Method Detail

AND

public static BooleanExpression AND(BooleanExpression... operands)

创建用AND连接的表达式

Parameters:

operands -

Returns:

用AND连接之后的表达式

AND

public static BooleanExpression AND(Collection<? extends BooleanExpression> operands)

创建用AND连接的表达式

Parameters:

operands -

Returns:

用AND连接之后的表达式

OR

public static BooleanExpression OR(BooleanExpression... operands)

创建用OR连接的表达式

Parameters:

operands -

Returns:

用OR连接之后的表达式

OR

public static BooleanExpression OR(Collection<? extends BooleanExpression> operands)

创建用OR连接的表达式

Parameters:

operands -

Returns:

用OR连接之后的表达式

NOT

public static BooleanExpression NOT(BooleanExpression operand)

创建用NOT修饰的表达式

Parameters:

operand -

Returns:

用NOT修饰之后的表达式

HAS

public static BooleanExpression HAS(Object obj)

addOperand

public void addOperand(BooleanExpression operand)

给表达式增加运算数

Parameters:

operand -

addOperand

public void addOperand(BooleanExpression... operands)

给表达式增加运算数

Parameters:

operands -

addOperand

public void addOperand(Collection<? extends BooleanExpression> operands)

给表达式增加运算数

Parameters:

operands -

evaluate

public boolean evaluate(Object context)

获得表达式的结果。子类可以重载这个方法。

Parameters:

context -

Returns:

result

evaluate

public boolean evaluate()

用null作为context获得表达式的结果。子类不必重载这个方法。

Returns:

evaluate(null)

toString

public String toString()

转成字符串表示。子类可以重载这个方法。

Overrides:

toString in class Object