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package org.onap.ccsdk.sli.core.slipluginutils.slitopologyutils.graph;
/**
* Abstraction of a graph edge weight.
*/
public interface Weight extends Comparable<Weight> {
/**
* Merges the given weight with this one returning a new aggregated
* weight.
*
* @param otherWeight weight to add
* @return aggregated weight
*/
Weight merge(Weight otherWeight);
/**
* Subtracts the given weight from this one and produces a new weight.
*
* @param otherWeight weight to subtract
* @return residual weight
*/
Weight subtract(Weight otherWeight);
/**
* Returns true if the weighted subject (link/path) can be traversed; false otherwise.
*
* @return true if weight is adequate, false if weight is infinite
*/
boolean isViable();
/**
* Returns true if the weight is negative (means that aggregated
* path cost will decrease if we add weighted subject to it).
*
* @return true if the weight is negative, false otherwise
*/
boolean isNegative();
}
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