ExpressionLexicalAnalyzer (Oracle Spatial and Graph Java API Reference)

java.lang.Object
- oracle.spatial.network.nfe.expression.ExpressionLexicalAnalyzer

All Implemented Interfaces:

NFEExpressionAnalyzer
```
public class ExpressionLexicalAnalyzer
extends java.lang.Object
implements NFEExpressionAnalyzer
```
Default implementation for NFEExpressionAnalyzer.
The supported operators are AND, OR, AND NOT, OR NOT, =, !=, >, <, >=, <=, *, /, +, -, (, )

If you want to get as result a double us only *, /, +, -, (, ) and numbers. The most common case is when evaluating an attribute expression to apply a customized cost based on numerical attributes.

Examples of valid expressions that will return a double, COST is an attribute of the feature used to build the expression:
```
 1) COST*5/4
 2) 8*(4-3)
 
```
You may want to get a boolean as returned value. The most common case is when evaluating NFE rules attributes expressions. Note that any string has to be quoted.

Examples of valid expression that will return a boolean, LENGTH and NAME are attributes of the feature used to build the expression:
```
  1) LENGTH = 1
  2) (LENGTH + 2) = 5 AND (NAME = 'Peter' OR NAME = 'John')
 
```

Field Summary

Fields
Modifier and Type	Field and Description
`static java.lang.String`	`AND` AND operator.
`static java.lang.String`	`AND_NOT` AND NOT operator.
`static java.lang.String`	`BIGGER_OR_EQUALS_THAN` BIGGER OR EQUALS THAN operator.
`static java.lang.String`	`BIGGER_THAN` BIGGER THAN operator.
`static java.lang.String`	`DIVISION` DIVISION operator.
`static java.lang.String`	`EQUALS` EQUALS operator.
`static java.lang.String`	`MINUS` MINUS operator.
`static java.lang.String`	`MULTIPLICITY` MULTIPLICITY operator.
`static java.lang.String`	`NOT_EQUALS` NOT EQUALS operator.
`static java.lang.String`	`OR` OR operator.
`static java.lang.String`	`OR_NOT` OR NOT operator.
`static java.lang.String`	`PLUS` PLUS operator.
`static java.lang.String`	`SMALLER_OR_EQUALS_THAN` SMALLER OR EQUALS THAN operator.
`static java.lang.String`	`SMALLER_THAN` SMALLER THAN operator.

Constructor Summary

Constructors
Constructor and Description

ExpressionLexicalAnalyzer()

Constructors
Constructor and Description
`ExpressionLexicalAnalyzer()`

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method and Description
`ReturnValue`	`build(NFEFeature feature)` Builds the expression and return the expression value.
`java.lang.String`	`getExpression()` Returns the expression
`void`	`setExpression(java.lang.String expression)` Sets the expression to analyze.

Methods inherited from class java.lang.Object
equals, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

- Field Detail
  - AND
```
public static java.lang.String AND
```
    AND operator.
  - OR
```
public static java.lang.String OR
```
    OR operator.
  - AND_NOT
```
public static java.lang.String AND_NOT
```
    AND NOT operator.
  - OR_NOT
```
public static java.lang.String OR_NOT
```
    OR NOT operator.
  - EQUALS
```
public static java.lang.String EQUALS
```
    EQUALS operator.
  - NOT_EQUALS
```
public static java.lang.String NOT_EQUALS
```
    NOT EQUALS operator.
  - BIGGER_THAN
```
public static java.lang.String BIGGER_THAN
```
    BIGGER THAN operator.
  - SMALLER_THAN
```
public static java.lang.String SMALLER_THAN
```
    SMALLER THAN operator.
  - BIGGER_OR_EQUALS_THAN
```
public static java.lang.String BIGGER_OR_EQUALS_THAN
```
    BIGGER OR EQUALS THAN operator.
  - SMALLER_OR_EQUALS_THAN
```
public static java.lang.String SMALLER_OR_EQUALS_THAN
```
    SMALLER OR EQUALS THAN operator.
  - MULTIPLICITY
```
public static java.lang.String MULTIPLICITY
```
    MULTIPLICITY operator.
  - DIVISION
```
public static java.lang.String DIVISION
```
    DIVISION operator.
  - PLUS
```
public static java.lang.String PLUS
```
    PLUS operator.
  - MINUS
```
public static java.lang.String MINUS
```
    MINUS operator.
- Constructor Detail
  - ExpressionLexicalAnalyzer
```
public ExpressionLexicalAnalyzer()
```
- Method Detail
  - getExpression
```
public java.lang.String getExpression()
```
    Returns the expression
    
    Returns:
    
    expression
  - setExpression
```
public void setExpression(java.lang.String expression)
```
    Description copied from interface: NFEExpressionAnalyzer
    
    Sets the expression to analyze.
    
    Specified by:
    
    setExpression in interface NFEExpressionAnalyzer
    
    Parameters:
    
    expression - expression
  - build
```
public ReturnValue build(NFEFeature feature)
                  throws InvalidExpressionException
```
    Description copied from interface: NFEExpressionAnalyzer
    
    Builds the expression and return the expression value.
    
    Specified by:
    
    build in interface NFEExpressionAnalyzer
    
    Parameters:
    
    feature - feature to use in the expression.
    
    Returns:
    
    return value, the value can be a boolean or a double.
    
    Throws:
    
    InvalidExpressionException - if the expression is not valid

Class ExpressionLexicalAnalyzer

Field Summary

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Field Detail

AND

OR

AND_NOT

OR_NOT

EQUALS

NOT_EQUALS

BIGGER_THAN

SMALLER_THAN

BIGGER_OR_EQUALS_THAN

SMALLER_OR_EQUALS_THAN

MULTIPLICITY

DIVISION

PLUS

MINUS

Constructor Detail

ExpressionLexicalAnalyzer

Method Detail

getExpression

setExpression

build