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* Copyright 2019 Adobe. All rights reserved.
* This file is licensed to you 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 REPRESENTATIONS
* OF ANY KIND, either express or implied. See the License for the specific language
* governing permissions and limitations under the License.
*/
import commons from './Commons';
/**
Set of property value validation functions.
*/
class Validation {
/**
Ensures that the value has changed.
@param {*} newValue
The new value.
@param {*} oldValue
The existing value.
@returns {Boolean} <code>true</code> if the values are different.
*/
valueMustChange(newValue, oldValue) {
// We can use exact equality here as validation functions are called after transform. Thus, the input value will be
// converted to the same type as a stored value
return newValue !== oldValue;
}
/**
Ensures that the new value is within the enumeration. The enumeration can be given as an array of values or as a
key/value Object. Take into consideration that enumerations are case sensitive.
@example // Enumeration as Array
Coral.validate.enumeration(['xs', 's', 'm', 'l']);
@example // Enumeration as Object
Coral.validate.enumeration({EXTRA_SMALL : 'xs', SMALL : 's', MEDIUM : 'm', LARGE : 'l'});
@param {Object} enumeration
Object that represents an enum.
@returns {ValidationFunction}
a validation function that ensures that the given value is within the enumeration.
*/
enumeration(enumeration) {
// Reverses the enumeration, so that we can check that the variable new value exists inside
const enumReversed = commons.swapKeysAndValues(enumeration);
// Returns a new function that matches the newValue, oldValue signature
return (newValue) => typeof enumReversed[newValue] !== 'undefined';
}
}
/**
Signature of the function used to validate new input. It accepts a newValue and an oldValue which are used to
determine if the newValue is valid.
@typedef {function} ValidationFunction
@param {*} newValue
The new value to validate.
@param {*} oldValue
The existing value.
@returns {Boolean} <code>true</code> if the validation succeeded, otherwise <code>false</code>.
*/
/**
A property transform utility.
@type {Validation}
*/
const validate = new Validation();
export default validate;
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