001package ball.util.ant.taskdefs;
002/*-
003 * ##########################################################################
004 * Utilities
005 * $Id: NotEmpty.Checker.html 5431 2020-02-12 19:03:17Z ball $
006 * $HeadURL: svn+ssh://svn.hcf.dev/var/spool/scm/repository.svn/hcf-dev/blog/2019-07-08-fivethirtyeight-best-scrabble-string/src/main/resources/javadoc/src-html/ball/util/ant/taskdefs/NotEmpty.Checker.html $
007 * %%
008 * Copyright (C) 2008 - 2020 Allen D. Ball
009 * %%
010 * Licensed under the Apache License, Version 2.0 (the "License");
011 * you may not use this file except in compliance with the License.
012 * You may obtain a copy of the License at
013 *
014 *      http://www.apache.org/licenses/LICENSE-2.0
015 *
016 * Unless required by applicable law or agreed to in writing, software
017 * distributed under the License is distributed on an "AS IS" BASIS,
018 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
019 * See the License for the specific language governing permissions and
020 * limitations under the License.
021 * ##########################################################################
022 */
023import java.lang.annotation.Documented;
024import java.lang.annotation.Retention;
025import java.lang.annotation.Target;
026import java.util.Collection;
027import lombok.NoArgsConstructor;
028import lombok.ToString;
029import org.apache.tools.ant.Task;
030import org.apache.tools.ant.TaskConfigurationChecker;
031
032import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
033import static java.lang.annotation.ElementType.FIELD;
034import static java.lang.annotation.ElementType.METHOD;
035import static java.lang.annotation.RetentionPolicy.RUNTIME;
036
037/**
038 * {@link AntTaskAttributeConstraint} annotation to indicate that an
039 * attribute cannot be an empty {@link java.util.Collection}.
040 *
041 * @author {@link.uri mailto:ball@hcf.dev Allen D. Ball}
042 * @version $Revision: 5431 $
043 */
044@NotNull
045@AntTaskAttributeConstraint(NotEmpty.Checker.class)
046@Documented
047@Retention(RUNTIME)
048@Target({ ANNOTATION_TYPE, FIELD, METHOD })
049public @interface NotEmpty {
050
051    /**
052     * {@link AntTaskAttributeConstraint.Checker}.
053     */
054    @NoArgsConstructor @ToString
055    public static class Checker extends AntTaskAttributeConstraint.Checker {
056        @Override
057        protected void check(Task task, TaskConfigurationChecker checker,
058                             String name, Object value) {
059            checker.assertConfig(! (((Collection) value).isEmpty()),
060                                 "`" + name + "' attribute must not be empty");
061        }
062    }
063}