groovy.util

## Class Eval

- java.lang.Object
- - groovy.util.Eval

    public class Eval
    extends Object

Allow easy integration from Groovy into Java through convenience methods.
This class is a simple helper on top of GroovyShell. You can use it to evaluate small Groovy scripts that don't need large Binding objects. For example, this script executes with no errors:

     assert 10 == Eval.me(' 2 * 4 + 2')
     assert 10 == Eval.x(2, ' x * 4 + 2')

Author:
  Dierk Koenig
See Also:
  `GroovyShell`

### Constructor Summary

Constructors
Constructor and Description
`Eval()`

### Method Summary

Methods
`static Object` `me(String expression)` Evaluates the specified String expression and returns the result.
`static Object` `me(String symbol, Object object, String expression)` Evaluates the specified String expression and makes the parameter available inside the script, returning the result.
`static Object` `x(Object x, String expression)` Evaluates the specified String expression and makes the parameter available inside the script bound to a variable named 'x', returning the result.
`static Object` `xy(Object x, Object y, String expression)` Evaluates the specified String expression and makes the first two parameters available inside the script bound to variables named 'x' and 'y' respectively, returning the result.
`static Object` `xyz(Object x, Object y, Object z, String expression)` Evaluates the specified String expression and makes the first three parameters available inside the script bound to variables named 'x', 'y', and 'z' respectively, returning the result.

### Methods inherited from class java.lang.Object

`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

### Constructor Detail

#### Eval

    public Eval()

### Method Detail

#### me

    public static Object me(String expression)
                     throws CompilationFailedException

Evaluates the specified String expression and returns the result. For example:

     assert 10 == Eval.me(' 2 * 4 + 2')

Parameters:
  `expression` - the Groovy expression to evaluate
Returns:
  the result of the expression
Throws:
  `CompilationFailedException` - if expression is not valid Groovy

#### me

    public static Object me(String symbol,
            Object object,
            String expression)
                     throws CompilationFailedException

Evaluates the specified String expression and makes the parameter available inside the script, returning the result. For example, this code binds the 'x' variable:

     assert 10 == Eval.me('x', 2, ' x * 4 + 2')

Parameters:
  `expression` - the Groovy expression to evaluate
Returns:
  the result of the expression
Throws:
  `CompilationFailedException` - if expression is not valid Groovy

#### x

    public static Object x(Object x,
           String expression)
                    throws CompilationFailedException

Evaluates the specified String expression and makes the parameter available inside the script bound to a variable named 'x', returning the result. For example, this code executes without failure:

     assert 10 == Eval.x(2, ' x * 4 + 2')

Parameters:
  `expression` - the Groovy expression to evaluate
Returns:
  the result of the expression
Throws:
  `CompilationFailedException` - if expression is not valid Groovy

#### xy

    public static Object xy(Object x,
            Object y,
            String expression)
                     throws CompilationFailedException

Evaluates the specified String expression and makes the first two parameters available inside the script bound to variables named 'x' and 'y' respectively, returning the result. For example, this code executes without failure:

     assert 10 == Eval.xy(2, 4, ' x * y + 2')

Parameters:
  `expression` - the Groovy expression to evaluate
Returns:
  the result of the expression
Throws:
  `CompilationFailedException` - if expression is not valid Groovy

#### xyz

    public static Object xyz(Object x,
             Object y,
             Object z,
             String expression)
                      throws CompilationFailedException

Evaluates the specified String expression and makes the first three parameters available inside the script bound to variables named 'x', 'y', and 'z' respectively, returning the result. For example, this code executes without failure:

     assert 10 == Eval.xyz(2, 4, 2, ' x * y + z')

Parameters:
  `expression` - the Groovy expression to evaluate
Returns:
  the result of the expression
Throws:
  `CompilationFailedException` - if expression is not valid Groovy