Expression (Atlas :: Expression 2.3.16 API)

All Known Subinterfaces:

BooleanExpression

All Known Implementing Classes:

ArithmeticExpression, BinaryExpression, ComparisonExpression, ConstantExpression, LogicExpression, UnaryExpression, VariableExpression
```
public interface Expression
```
Parses and evaluates a simple expression language. This was originally based on the selector expression language found in ActiveMQ. It was modified so that it's supports custom functions and it's comparison expressions were less SQL like, and more script like.

Field Summary

Fields
Modifier and Type Field Description

static LRUCache<String,Object> CACHE

Method Summary

All Methods Static Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`static void`	`clearCache()`
`io.atlasmap.v2.Field`	`evaluate(ExpressionContext expressionContext)`	Execute the expression against the given context.
`static Expression`	`parse(String expessionText, FunctionResolver functionResolver)`

Field Detail

CACHE

static final LRUCache<String,Object> CACHE

Method Detail

evaluate
```
io.atlasmap.v2.Field evaluate(ExpressionContext expressionContext)
                       throws ExpressionException
```
Execute the expression against the given context.

Parameters:

expressionContext - ExpressionContext

Returns:

Field represents a result

Throws:

ExpressionException - If evaluation fails

parse

static Expression parse(String expessionText,
                        FunctionResolver functionResolver)
                 throws ExpressionException

Throws:: ExpressionException

clearCache
```
static void clearCache()
```