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Groovy: A powerful, dynamic language for the JVM
/*
* Copyright 2003-2014 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
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package groovy.transform;
import java.lang.annotation.Retention;
import java.lang.annotation.RetentionPolicy;
import java.lang.annotation.Target;
import java.lang.annotation.ElementType;
import org.codehaus.groovy.transform.GroovyASTTransformationClass;
/**
* A class annotation used to make a class Comparable by multiple Comparators.
*
* As an example, given this class:
*
* {@code @Sortable} class Person {
* String first
* String last
* Integer born
* }
*
* The generated Groovy class will:
*
* - implement the {@code Comparable} interface
* - have a {@code compareTo} method based on the {@code first},
* {@code last} and {@code born} properties (priority ordering will be according
* to the ordering of property definition, highest first, unless 'includes' is used; in which case,
* priority will be according to the order given in the includes list)
* - have three {@code Comparator} methods named {@code comparatorByFirst},
* {@code comparatorByLast} and {@code comparatorByBorn}
*
* The properties within the class must themselves be {@code Comparable} or {@code @Sortable}.
*
* @author Andres Almiray
* @author Paul King
*/
@Retention(RetentionPolicy.RUNTIME)
@Target({ElementType.TYPE})
@GroovyASTTransformationClass("org.codehaus.groovy.transform.SortableASTTransformation")
public @interface Sortable {
/**
* Property names to include in the comparison algorithm.
* Must not be used if 'excludes' is used.
*/
String[] includes() default {};
/**
* Property names to exclude in the comparison algorithm.
* Must not be used if 'includes' is used.
*/
String[] excludes() default {};
}