eval (Apache Jena ARQ)

java.lang.Object
- org.apache.jena.sparql.function.library.eval

All Implemented Interfaces:

Function
```
public class eval
extends java.lang.Object
implements Function
```
Function that evaluates an expression. To convert errors to true or false, use COALESCE.

Constructor Summary

Constructors
Constructor Description

eval()

Method Summary

All Methods Instance Methods Concrete Methods
Modifier and Type	Method	Description
`void`	`build(java.lang.String uri, ExprList args)`	Called during query plan construction immediately after the construction of the extension instance.
`NodeValue`	`exec(Binding binding, ExprList args, java.lang.String uri, FunctionEnv env)`	Processes unevaluated arguments

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

- Constructor Detail
  - eval
```
public eval()
```
- Method Detail
  - build
```
public void build(java.lang.String uri,
                  ExprList args)
```
    Description copied from interface: Function
    
    Called during query plan construction immediately after the construction of the extension instance. Can throw ExprBuildException if something is wrong (like wrong number of arguments).
    
    Specified by:
    
    build in interface Function
    
    args - The parsed arguments
  - exec
```
public NodeValue exec(Binding binding,
                      ExprList args,
                      java.lang.String uri,
                      FunctionEnv env)
```
    Processes unevaluated arguments
    
    Specified by:
    
    exec in interface Function
    
    Parameters:
    
    binding - The current solution
    
    args - A list of unevaluated expressions
    
    uri - The name of this
    
    env - The execution context
    
    Returns:
    
    NodeValue - a value