io.github.theangrydev.businessflows.FieldValidator Maven / Gradle / Ivy
/*
* Copyright 2016 Liam Williams .
*
* This file is part of business-flows.
*
* 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 io.github.theangrydev.businessflows;
/**
* A {@link Validator} for a {@link Field} of a {@link Happy} object.
*
* @param The type that contains the {@link Field}
* @param The type of validation failure
* @param The type of the field to validate
*/
public class FieldValidator implements Validator {
private final Mapping fieldExtractor;
private final Validator validator;
private FieldValidator(Mapping fieldExtractor, Validator validator) {
this.fieldExtractor = fieldExtractor;
this.validator = validator;
}
/**
* Produces a {@link FieldValidator} that will validate the extracted field using the given validator.
*
* @param fieldExtractor Extracts the {@link Field} from the {@link Happy}
* @param fieldValidator The {@link Validator} will validate the {@link Field}, possibly producing a {@link Sad} failure
* @param The type that contains the {@link Field}
* @param The type of validation failure
* @param The type of the field to validate
* @return The validator
*/
public static FieldValidator fieldValidator(Mapping fieldExtractor, Validator fieldValidator) {
return new FieldValidator<>(fieldExtractor, fieldValidator);
}
@Override
public PotentialFailure attempt(Happy happy) throws Exception {
Field field = fieldExtractor.map(happy);
return validator.attempt(field);
}
}