001package ball.util.ant.taskdefs;
002/*-
003 * ##########################################################################
004 * Utilities
005 * %%
006 * Copyright (C) 2008 - 2022 Allen D. Ball
007 * %%
008 * Licensed under the Apache License, Version 2.0 (the "License");
009 * you may not use this file except in compliance with the License.
010 * You may obtain a copy of the License at
011 *
012 *      http://www.apache.org/licenses/LICENSE-2.0
013 *
014 * Unless required by applicable law or agreed to in writing, software
015 * distributed under the License is distributed on an "AS IS" BASIS,
016 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017 * See the License for the specific language governing permissions and
018 * limitations under the License.
019 * ##########################################################################
020 */
021import java.lang.annotation.Documented;
022import java.lang.annotation.Retention;
023import java.lang.annotation.Target;
024import lombok.NoArgsConstructor;
025import lombok.ToString;
026import org.apache.tools.ant.Task;
027import org.apache.tools.ant.TaskConfigurationChecker;
028
029import static java.lang.annotation.ElementType.ANNOTATION_TYPE;
030import static java.lang.annotation.ElementType.FIELD;
031import static java.lang.annotation.ElementType.METHOD;
032import static java.lang.annotation.RetentionPolicy.RUNTIME;
033
034/**
035 * {@link AntTaskAttributeConstraint} annotation to indicate that an
036 * attribute cannot be {@code null}.
037 *
038 * @author {@link.uri mailto:ball@hcf.dev Allen D. Ball}
039 */
040@AntTaskAttributeConstraint(NotNull.Checker.class)
041@Documented
042@Retention(RUNTIME)
043@Target({ ANNOTATION_TYPE, FIELD, METHOD })
044public @interface NotNull {
045
046    /**
047     * {@link AntTaskAttributeConstraint.Checker}.
048     */
049    @NoArgsConstructor @ToString
050    public static class Checker extends AntTaskAttributeConstraint.Checker {
051        @Override
052        protected void check(Task task, TaskConfigurationChecker checker, String name, Object value) {
053            checker.assertConfig(value != null, "`" + name + "' attribute must not be null");
054        }
055    }
056}