Expression (tensorics-core API)

Type Parameters:

R - the type of the resulting value

All Superinterfaces:

Node, java.io.Serializable

All Known Subinterfaces:

ExceptionHandlingNode<R>

All Known Implementing Classes:

AbstractDeferredExpression, AnalysisExpression, AnyIterableConversionExpression, AssertionExpression, BinaryOperationExpression, BinaryPredicateExpression, BinaryPredicateIterableExpression, ConversionOperationExpression, CreationOperationExpression, DiscreteFunctionToIterableExpression, DoubleScript, FunctionalExpression, IsEqualToExpression, IsNotEqualExpression, IterableExpressionToIterable, IterableOperationExpression, IterableResolvingExpression, LatestOfExpression, PickExpression, Placeholder, PreconditionExpression, PredicateExpression, ResolvedExpression, TensoricScript, UnaryOperationExpression
```
public interface Expression<R>
extends Node, java.io.Serializable
```
An expression is a placeholder for concrete value (called 'resolved' in the following) or a value which has to still be evaluated (deferred).

Method Summary

All Methods Instance Methods Abstract Methods
Modifier and Type	Method	Description
`R`	`get()`	Retrieves the value of the expression.
`boolean`	`isResolved()`	returns `true` if the expression contains a concrete value.

Methods inherited from interface org.tensorics.core.tree.domain.Node
getChildren

- Method Detail
  - isResolved
```
boolean isResolved()
```
    returns true if the expression contains a concrete value. Thus the method get() can be used to retrieve the actual value. If this method returns false, then the get method will throw an exception.
    
    Returns:
    
    true if the value can be retrieved, false otherwise.
  - get
```
R get()
```
    Retrieves the value of the expression. If the expression is deferred, then an expression will be thrown.
    
    Returns:
    
    the value of the expression.
    
    Throws:
    
    ExpressionIsUnresolvedException - if the value is not determined.