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An AssertJ extension for Bean-Validation
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/*
 * 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.
 *
 * Copyright 2012-2021 the original author or authors.
 */
package com.github.jinahya.assertj.validation;

/*-
 * #%L
 * assertj-bean-validation
 * %%
 * Copyright (C) 2021 Jinahya, Inc.
 * %%
 * 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.
 * #L%
 */

import java.util.function.Function;

/**
 * A utility class for Bean-Validation.
 *
 * @author Jin Kwon <onacit_at_gmail.com>
 */
final class ValidationUtils {

    private static final String SUFFIX = "Validation";

    static  R applyValidationClass(final Function, ? extends R> function) {
        return ReflectionUtils.applyClassForSuffix(SUFFIX, function);
    }

    private static Class validationClass = null;

    static Class getValidationClass() {
        if (validationClass == null) {
            validationClass = applyValidationClass(Function.identity());
        }
        return validationClass;
    }

    private static Object defaultValidatorFactory = null;

    static Object defaultValidatorFactory() {
        if (defaultValidatorFactory == null) {
            try {
                defaultValidatorFactory = getValidationClass().getMethod("buildDefaultValidatorFactory").invoke(null);
            } catch (final ReflectiveOperationException roe) {
                throw new RuntimeException(roe);
            }
        }
        return defaultValidatorFactory;
    }

    /**
     * Returns an instance of {@code ....validation.Validator}.
     *
     * @return an instance of {@code ....validation.Validator}.
     */
    static Object getValidator() {
        return ValidatorFactoryUtils.getValidator(defaultValidatorFactory());
    }

    private ValidationUtils() {
        throw new AssertionError("instantiation is not allowed");
    }
}