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Groovy example source code file (

This example Groovy source code file ( is included in the "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Groovy tags/keywords

annotation, field, field, groovyasttransformationclass, groovyasttransformationclass, target, target

The Groovy source code

 * Copyright 2008-2010 the original author or authors.
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * See the License for the specific language governing permissions and
 * limitations under the License.

package groovy.transform;

import org.codehaus.groovy.transform.GroovyASTTransformationClass;

import java.lang.annotation.ElementType;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;

 * Variable annotation used for changing the scope of a variable within a script from
 * being within the run method of the script to being at the class level for the script.
 * <p>
 * The annotated variable will become a private field of the script class.
 * The type of the field will be the same as the type of the variable. Example usage:
 * <pre>
 * {@code @Field} List awe = [1, 2, 3]
 * def awesum() { awe.sum() }
 * assert awesum() == 6
 * </pre>
 * In this example, without the annotation, variable <code>awe would be
 * a local script variable (technically speaking it will be a local variable within
 * the <code>run method of the script class). Such a local variable would
 * not be visible inside the <code>awesum method. With the annotation,
 * <code>awe becomes a private List field in the script class and is
 * visible within the <code>awesum method.
 * @author Paul King
 * @since 1.8.0
public @interface Field {

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