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Groovy example source code file (IndexedProperty.java)

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

Java - Groovy tags/keywords

annotation, groovyasttransformationclass, groovyasttransformationclass, indexedproperty, indexedproperty, target, target

The Groovy IndexedProperty.java 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
 *
 *     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 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;

/**
 * Field annotation used with properties to provide an indexed getter and setter for the property.
 * Groovy provides nice GPath syntax support for accessing indexed properties but Java tools
 * or frameworks may expect the JavaBean style setters and getters.
 * <p>
 * <em>Example usage: suppose you have a class with the following properties:
 * <pre>
 * {@code @IndexedProperty} FieldType[] someField
 * {@code @IndexedProperty} List<FieldType> otherField
 * {@code @IndexedProperty} List furtherField
 * </pre>
 * will add the following methods to the class containing the properties:
 * <pre>
 * FieldType getSomeField(int index) {
 *     someField[index]
 * }
 * FieldType getOtherField(int index) {
 *     otherField[index]
 * }
 * Object getFurtherField(int index) {
 *     furtherField[index]
 * }
 * void setSomeField(int index, FieldType val) {
 *     someField[index] = val
 * }
 * void setOtherField(int index, FieldType val) {
 *     otherField[index] = val
 * }
 * void setFurtherField(int index, Object val) {
 *     furtherField[index] = val
 * }
 * </pre>
 * Normal Groovy visibility rules for properties apply
 * (i.e. no <code>public, private or package
 * visibility can be specified) or you will receive a compile-time error message.
 * The normal Groovy property getters and setters will also be created.
 * <p>
 *
 * @author Paul King
 * @since 1.7.3
 */
@java.lang.annotation.Documented
@Retention(RetentionPolicy.SOURCE)
@Target({ElementType.FIELD})
@GroovyASTTransformationClass("org.codehaus.groovy.transform.IndexedPropertyASTTransformation")
public @interface IndexedProperty {
}

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