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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 com.google.common.base.MoreObjects;
import org.onosproject.net.Link;
import org.onosproject.net.resource.link.LinkResourceService;
import java.util.Objects;
import static org.onosproject.net.AnnotationKeys.getAnnotatedValue;
/**
* Constraint that evaluates an arbitrary link annotated value is under the specified threshold.
*/
@Beta
public class AnnotationConstraint extends BooleanConstraint {
private final String key;
private final double threshold;
/**
* Creates a new constraint to keep the value for the specified key
* of link annotation under the threshold.
*
* @param key key of link annotation
* @param threshold threshold value of the specified link annotation
*/
public AnnotationConstraint(String key, double threshold) {
this.key = key;
this.threshold = threshold;
}
// Constructor for serialization
private AnnotationConstraint() {
this.key = "";
this.threshold = 0;
}
/**
* Returns the key of link annotation this constraint designates.
* @return key of link annotation
*/
public String key() {
return key;
}
/**
* Returns the threshold this constraint ensures as link annotated value.
*
* @return threshold as link annotated value
*/
public double threshold() {
return threshold;
}
@Override
public boolean isValid(Link link, LinkResourceService resourceService) {
double value = getAnnotatedValue(link, key);
return value <= threshold;
}
@Override
public double cost(Link link, LinkResourceService resourceService) {
if (isValid(link, resourceService)) {
return getAnnotatedValue(link, key);
} else {
return -1;
}
}
@Override
public int hashCode() {
return Objects.hash(key, threshold);
}
@Override
public boolean equals(Object obj) {
if (this == obj) {
return true;
}
if (!(obj instanceof AnnotationConstraint)) {
return false;
}
final AnnotationConstraint other = (AnnotationConstraint) obj;
return Objects.equals(this.key, other.key) && Objects.equals(this.threshold, other.threshold);
}
@Override
public String toString() {
return MoreObjects.toStringHelper(this)
.add("key", key)
.add("threshold", threshold)
.toString();
}
}
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