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package org.onap.ccsdk.sli.core.slipluginutils.slitopologyutils.graph;
import java.util.Objects;
import static com.google.common.base.MoreObjects.toStringHelper;
/**
* Weight implementation based on a double value.
*/
public class ScalarWeight implements Weight {
/**
* Instance of scalar weight to mark links/paths which
* can not be traversed.
*/
public static final ScalarWeight NON_VIABLE_WEIGHT =
new ScalarWeight(Double.POSITIVE_INFINITY);
private static double samenessThreshold = Double.MIN_VALUE;
private final double value;
/**
* Creates a new scalar weight with the given double value.
* @param value double value
* @return scalar weight instance
*/
public static ScalarWeight toWeight(double value) {
return new ScalarWeight(value);
}
/**
* Creates a new scalar weight with the given double value.
* @param value double value
*/
public ScalarWeight(double value) {
this.value = value;
}
@Override
public Weight merge(Weight otherWeight) {
return new ScalarWeight(value + ((ScalarWeight) otherWeight).value);
}
@Override
public Weight subtract(Weight otherWeight) {
return new ScalarWeight(value - ((ScalarWeight) otherWeight).value);
}
@Override
public boolean isViable() {
return !this.equals(NON_VIABLE_WEIGHT);
}
@Override
public int compareTo(Weight otherWeight) {
//check equality with samenessThreshold
if (equals(otherWeight)) {
return 0;
}
return Double.compare(value, ((ScalarWeight) otherWeight).value);
}
@Override
public boolean equals(Object obj) {
return ((obj instanceof ScalarWeight) &&
(Math.abs(value - ((ScalarWeight) obj).value) < samenessThreshold)
);
}
@Override
public int hashCode() {
return Objects.hash(value);
}
@Override
public boolean isNegative() {
return value < 0;
}
@Override
public String toString() {
return toStringHelper(this).add("value", value).toString();
}
/**
* Returns inner double value.
*
* @return double value
*/
public double value() {
return value;
}
}
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