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Groovy example source code file (Grapes.java)

This example Groovy source code file (Grapes.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

grab, grab, grapes, grapes

The Groovy Grapes.java source code

/*
 * Copyright 2003-2009 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.lang;

/**
 * Sometimes we will need more than one grab per class, but we can only add
 * one annotation type per annotatable node.  This class allows for multiple
 * grabs to be added.
 * <p/>
 * For example:
 * <p/>
 * <pre>
 * {@code @Grapes([@Grab(module='m1'), @Grab(module='m2')])}
 * class AnnotatedClass { ... }
 * </pre>
 * <p/>
 * You can override an implicit transitive dependency by providing an explicit one.
 * E.g. htmlunit 2.6 normally uses xerces 2.9.1 but you can get 2.9.0 as follows:
 * <pre>
 * {@code @Grapes}([
 *     {@code @Grab}('net.sourceforge.htmlunit:htmlunit:2.6'),
 *     {@code @Grab}('xerces#xercesImpl;2.9.0')
 * ])
 * </pre>
 * Obviously, only do this if you understand the consequences.
 * <p/>
 * You can also remove transitive dependencies altogether (provided you
 * know you don't need them) using {@code @GrabExclude}.
 * For example, here is how we would not grab the {@code logkit} and
 * {@code avalon-framework} transitive dependencies for Apache POI:
 * <pre>
 * {@code @Grapes}([
 *   {@code @Grab}("org.apache.poi#poi;3.5-beta6"),
 *   {@code @GrabExclude}("logkit:logkit"),
 *   {@code @GrabExclude}("avalon-framework#avalon-framework")
 * ])
 * import org.apache.poi.hssf.util.CellReference
 * assert new CellReference(0, 0, false, false).formatAsString() == 'A1'
 * assert new CellReference(1, 3).formatAsString() == '$D$2'
 * </pre>
 * It is also sometimes also useful to use {@code @GrabConfig} to further adjust how dependencies
 * are grabbed. See {@code @GrabConfig} for further information.
 */
public @interface Grapes {
    Grab[] value();

    /**
     * This will be pushed into the child grab annotations if the value is not
     * set in the child annotation already.
     * <p/>
     * This results in an effective change in the default value, which each @Grab
     * can still override
     */
    boolean initClass() default true;
}

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