Expression

All Known Implementing Classes:

Term
```
public interface Expression
```
Expression is an Interface to evaluate a numeric or boolen expression

Author:

yannanlu@yahoo.com

Field Summary

Fields
Modifier and Type	Field and Description
`static int`	`EVAL_ADD`
`static int`	`EVAL_AND`
`static int`	`EVAL_DIV`
`static int`	`EVAL_MOD`
`static int`	`EVAL_MUL`
`static int`	`EVAL_NONE`
`static int`	`EVAL_OR`
`static int`	`EVAL_SUB`
`static java.lang.Integer`	`FALSE`
`static java.lang.Integer`	`TRUE`

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method and Description
`java.lang.Number`	`evaluate()` returns the value of the expression
`int`	`getOperation()` returns the operation id of the expression
`java.lang.String`	`getText()` returns the original text of the expression
`boolean`	`isNegative()` returns the isNegative flag of the expression
`boolean`	`isNumeric()` returns true if the expression is numeric or false otherwise
`void`	`negate()` sets the isNegative flag to true
`void`	`setOperation(int op)` sets the operation to the expression
`int`	`size()` returns total number of the items in the expression

- Field Detail
  - EVAL_NONE
```
static final int EVAL_NONE
```
    See Also:
    
    Constant Field Values
  - EVAL_ADD
```
static final int EVAL_ADD
```
    See Also:
    
    Constant Field Values
  - EVAL_SUB
```
static final int EVAL_SUB
```
    See Also:
    
    Constant Field Values
  - EVAL_MUL
```
static final int EVAL_MUL
```
    See Also:
    
    Constant Field Values
  - EVAL_DIV
```
static final int EVAL_DIV
```
    See Also:
    
    Constant Field Values
  - EVAL_MOD
```
static final int EVAL_MOD
```
    See Also:
    
    Constant Field Values
  - EVAL_AND
```
static final int EVAL_AND
```
    See Also:
    
    Constant Field Values
  - EVAL_OR
```
static final int EVAL_OR
```
    See Also:
    
    Constant Field Values
  - TRUE
```
static final java.lang.Integer TRUE
```
  - FALSE
```
static final java.lang.Integer FALSE
```
- Method Detail
  - evaluate
```
java.lang.Number evaluate()
```
    returns the value of the expression
  - getOperation
```
int getOperation()
```
    returns the operation id of the expression
  - setOperation
```
void setOperation(int op)
```
    sets the operation to the expression
  - size
```
int size()
```
    returns total number of the items in the expression
  - isNumeric
```
boolean isNumeric()
```
    returns true if the expression is numeric or false otherwise
  - isNegative
```
boolean isNegative()
```
    returns the isNegative flag of the expression
  - negate
```
void negate()
```
    sets the isNegative flag to true
  - getText
```
java.lang.String getText()
```
    returns the original text of the expression

Interface Expression

Field Summary

Method Summary

Field Detail

EVAL_NONE

EVAL_ADD

EVAL_SUB

EVAL_MUL

EVAL_DIV

EVAL_MOD

EVAL_AND

EVAL_OR

TRUE

FALSE

Method Detail

evaluate

getOperation

setOperation

size

isNumeric

isNegative

negate

getText