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Naming Library of the SARL SDK

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/*
 * $Id$
 *
 * SARL is an general-purpose agent programming language.
 * More details on http://www.sarl.io
 *
 * Copyright (C) 2014-2024 SARL.io, the Original Authors and Main 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
 *
 *      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.sarl.api.naming.namespace

import java.lang.reflect.Field
import java.util.ArrayList

/** 
 * A tool that is able to determine if a field is observable or not by using a cascade of
 * other field access validators.
 * 
 * @author Stéphane Galland
 * @version api.naming 0.14.0 20241106-161408
 * @mavengroupid io.sarl.sdk
 * @mavenartifactid api.naming
 * @since 0.12
 */
class CascadeFieldAccessValidator implements IFieldAccessValidator {

	val validators = new ArrayList
	
	/** Add a sub-validator at the end of the cascade.
	 *
	 * @param validator the new validator, never {@code null}.
	 */
	def addValidator(validator : IFieldAccessValidator) {
		assert validator !== null
		this.validators += validator
	}

	override getFieldAccessRight(fieldOwner : Object, field : Field) : FieldAccessRight {
		for (subvalidator : this.validators) {
			val right = subvalidator.getFieldAccessRight(fieldOwner, field)
			if (right !== null && right !== FieldAccessRight::NONE) {
				return right
			}
		}
		return FieldAccessRight::NONE
	}

}