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groovy.util
[Java] Class Eval

java.lang.Object
  groovy.util.Eval

public class Eval
extends java.lang.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')
Authors:
Dierk Koenig
See Also:
GroovyShell

Method Summary
static java.lang.Object me(java.lang.String expression)

Evaluates the specified String expression and returns the result.

static java.lang.Object me(java.lang.String symbol, java.lang.Object object, java.lang.String expression)

Evaluates the specified String expression and makes the parameter available inside the script, returning the result.

static java.lang.Object x(java.lang.Object x, java.lang.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 java.lang.Object xy(java.lang.Object x, java.lang.Object y, java.lang.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 java.lang.Object xyz(java.lang.Object x, java.lang.Object y, java.lang.Object z, java.lang.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
java.lang.Object#wait(long, int), java.lang.Object#wait(long), java.lang.Object#wait(), java.lang.Object#equals(java.lang.Object), java.lang.Object#toString(), java.lang.Object#hashCode(), java.lang.Object#getClass(), java.lang.Object#notify(), java.lang.Object#notifyAll()
 

Method Detail

me

public static java.lang.Object me(java.lang.String expression)
Evaluates the specified String expression and returns the result. For example: 
 assert 10 == Eval.me(' 2 * 4 + 2')
throws:
CompilationFailedException if expression is not valid Groovy
Parameters:
expression - the Groovy expression to evaluate
Returns:
the result of the expression

me

public static java.lang.Object me(java.lang.String symbol, java.lang.Object object, java.lang.String expression)
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')
throws:
CompilationFailedException if expression is not valid Groovy
Parameters:
expression - the Groovy expression to evaluate
Returns:
the result of the expression

x

public static java.lang.Object x(java.lang.Object x, java.lang.String expression)
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')
throws:
CompilationFailedException if expression is not valid Groovy
Parameters:
expression - the Groovy expression to evaluate
Returns:
the result of the expression

xy

public static java.lang.Object xy(java.lang.Object x, java.lang.Object y, java.lang.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. For example, this code executes without failure: 
 assert 10 == Eval.xy(2, 4, ' x * y + 2')
throws:
CompilationFailedException if expression is not valid Groovy
Parameters:
expression - the Groovy expression to evaluate
Returns:
the result of the expression

xyz

public static java.lang.Object xyz(java.lang.Object x, java.lang.Object y, java.lang.Object z, java.lang.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. For example, this code executes without failure: 
 assert 10 == Eval.xyz(2, 4, 2, ' x * y + z')
throws:
CompilationFailedException if expression is not valid Groovy
Parameters:
expression - the Groovy expression to evaluate
Returns:
the result of the expression

 

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