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/*
* 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.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.resource.link.LinkResourceService;
/**
* 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 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;
}
}
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