A named computation that can be carried out on some nodes. Example include complexity metrics, like cyclomatic complexity.
Use with MetricsUtil, for example, in the Java module:
if (JavaMetrics.CYCLO.supports(node)) {
int cyclo = MetricsUtil.computeMetric(JavaMetrics.CYCLO, node);
...
}
Note that the supports check is necessary (metrics cannot necessarily be computed on any node of the type they support).
Metrics support a concept of options, which can be passed to compute or MetricsUtil.computeMetric(Metric, Node, MetricOptions).
Metric instances are stateless by contract.
To implement your own metrics, use the factory method of. Be aware though, that you cannot register a custom metric into a LanguageMetricsProvider, which means your metric will not be available from XPath.
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