/*
 * Copyright 2017-2020 original 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
 *
 * https://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 io.micronaut.validation.validator.constraints;

import io.micronaut.core.annotation.AnnotationValue;
import io.micronaut.core.annotation.Indexed;

import edu.umd.cs.findbugs.annotations.NonNull;
import edu.umd.cs.findbugs.annotations.Nullable;
import javax.annotation.concurrent.Immutable;
import javax.annotation.concurrent.ThreadSafe;
import javax.validation.ClockProvider;
import javax.validation.Constraint;
import java.lang.annotation.Annotation;

Constraint validator that can be used at either runtime or compilation time and is capable of validation Constraint instances. Allows defining validators that work with both Hibernate validator and Micronaut's validator. 
Unlike the specification's interface this one can uses as a functional interface. Implementor should not implement the ConstraintValidator.initialize(Annotation) method and should instead read the passed AnnotationValue.
Type parameters:
<A> – The annotation type
<T> – The supported validation types/**
 * Constraint validator that can be used at either runtime or compilation time and
 * is capable of validation {@link javax.validation.Constraint} instances. Allows defining validators that work with both Hibernate validator and Micronaut's validator.
 *
 * <p>Unlike the specification's interface this one can uses as a functional interface. Implementor should not implement the {@link #initialize(Annotation)} method and should instead read the passed {@link AnnotationValue}.</p>
 *
 * @param <A> The annotation type
 * @param <T> The supported validation types
 */
@Immutable
@ThreadSafe
@Indexed(ConstraintValidator.class)
@FunctionalInterface
public interface ConstraintValidator<A extends Annotation, T> extends javax.validation.ConstraintValidator<A, T> {

    
A constraint validator that just returns the object as being valid.
/**
     * A constraint validator that just returns the object as being valid.
     */
    ConstraintValidator VALID = (value, annotationMetadata, context) -> true;

    
Implements the validation logic.
Implementations should be thread-safe and immutable.
Params:
value – object to validate
annotationMetadata – The annotation metadata
context – The context object
Returns:
false if value does not pass the constraint/**
     * Implements the validation logic.
     *
     * <p>Implementations should be thread-safe and immutable.</p>
     *
     * @param value object to validate
     * @param annotationMetadata The annotation metadata
     * @param context The context object
     *
     * @return {@code false} if {@code value} does not pass the constraint
     */
    boolean isValid(
            @Nullable T value,
            @NonNull AnnotationValue<A> annotationMetadata,
            @NonNull ConstraintValidatorContext context);

    @Override
    default boolean isValid(T value, javax.validation.ConstraintValidatorContext context) {
        // simply adapt the interfaces for now.
        return isValid(value, new AnnotationValue(Constraint.class.getName()), new ConstraintValidatorContext() {
            @NonNull
            @Override
            public ClockProvider getClockProvider() {
                return context.getClockProvider();
            }

            @Nullable
            @Override
            public Object getRootBean() {
                return null;
            }
        });
    }
}