| /* |
| * Copyright 2014 Open Networking Laboratory |
| * |
| * 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.onlab.onos.net.intent.constraint; |
| |
| import org.onlab.onos.net.Link; |
| import org.onlab.onos.net.Path; |
| import org.onlab.onos.net.intent.Constraint; |
| import org.onlab.onos.net.resource.LinkResourceService; |
| |
| /** |
| * Abstract base class for various constraints that evaluate link viability |
| * in a yes/no fashion. |
| */ |
| public abstract class BooleanConstraint implements Constraint { |
| |
| /** |
| * Returns true if the specified link satisfies the constraint. |
| * |
| * @param link link to be validated |
| * @param resourceService resource service for checking available link resources |
| * @return true if link is viable |
| */ |
| public abstract boolean isValid(Link link, LinkResourceService resourceService); |
| |
| /** |
| * {@inheritDoc} |
| * |
| * Negative return value means the specified link does not satisfy this constraint. |
| * |
| * @param link {@inheritDoc} |
| * @param resourceService {@inheritDoc} |
| * @return {@inheritDoc} |
| */ |
| @Override |
| public double cost(Link link, LinkResourceService resourceService) { |
| return isValid(link, resourceService) ? +1 : -1; |
| } |
| |
| @Override |
| public boolean validate(Path path, LinkResourceService resourceService) { |
| for (Link link : path.links()) { |
| if (!isValid(link, resourceService)) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| } |