| /* |
| * Copyright 2014-present Open Networking Foundation |
| * |
| * 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 org.onosproject.net.intent.constraint; |
| |
| import com.google.common.annotations.Beta; |
| import org.onosproject.net.Link; |
| import org.onosproject.net.Path; |
| import org.onosproject.net.intent.Constraint; |
| import org.onosproject.net.intent.ResourceContext; |
| |
| /** |
| * Abstract base class for various constraints that evaluate link viability |
| * in a yes/no fashion. |
| */ |
| @Beta |
| public abstract class BooleanConstraint implements Constraint { |
| |
| /** |
| * Returns true if the specified link satisfies the constraint. |
| * |
| * @param link link to be validated |
| * @param context resource context for checking available resources |
| * @return true if link is viable |
| */ |
| public abstract boolean isValid(Link link, ResourceContext context); |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Negative return value means the specified link does not satisfy this constraint. |
| * |
| * @param link {@inheritDoc} |
| * @param context {@inheritDoc} |
| * @return {@inheritDoc} |
| */ |
| @Override |
| public double cost(Link link, ResourceContext context) { |
| return isValid(link, context) ? +1 : -1; |
| } |
| |
| @Override |
| public boolean validate(Path path, ResourceContext context) { |
| return path.links().stream() |
| .allMatch(link -> isValid(link, context)); |
| } |
| |
| } |