Package net.sourceforge.pmd.lang.metrics

Class MetricsUtil

java.lang.Object

net.sourceforge.pmd.lang.metrics.MetricsUtil

public final class MetricsUtil
extends Object

Utilities to use Metric instances.

Method Summary

Modifier and Type	Method	Description
static <N extends Node,R extends Number> R	computeMetric(Metric<? super N,R> key, N node)	Computes a metric identified by its code on a node, with the default options.
static <N extends Node,R extends Number> R	computeMetric(Metric<? super N,R> key, N node, MetricOptions options)	Computes a metric identified by its code on a node, possibly selecting a variant with the options parameter.
static <N extends Node,R extends Number> R	computeMetric(Metric<? super N,R> key, N node, MetricOptions options, boolean forceRecompute)	Computes a metric identified by its code on a node, possibly selecting a variant with the options parameter.
static <O extends Node> DoubleSummaryStatistics	computeStatistics(Metric<? super O,?> key, Iterable<? extends O> ops)	Computes statistics for the results of a metric over a sequence of nodes.
static <O extends Node> DoubleSummaryStatistics	computeStatistics(Metric<? super O,?> key, Iterable<? extends O> ops, MetricOptions options)	Computes statistics for the results of a metric over a sequence of nodes.
static boolean	supportsAll(Node node, Metric<?,?>... metrics)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Method Detail

supportsAll

public static boolean supportsAll(Node node,
                                  Metric<?,?>... metrics)

computeStatistics

public static <O extends Node> DoubleSummaryStatistics computeStatistics(Metric<? super O,?> key,
                                                                         Iterable<? extends O> ops)

Computes statistics for the results of a metric over a sequence of nodes.

Parameters:

key - The metric to compute

ops - List of nodes for which to compute the metric

Returns:

Statistics for the value of the metric over all the nodes

computeStatistics

public static <O extends Node> DoubleSummaryStatistics computeStatistics(Metric<? super O,?> key,
                                                                         Iterable<? extends O> ops,
                                                                         MetricOptions options)

Computes statistics for the results of a metric over a sequence of nodes.

Parameters:

key - The metric to compute

ops - List of nodes for which to compute the metric

options - The options of the metric

Returns:

Statistics for the value of the metric over all the nodes

computeMetric

public static <N extends Node,R extends Number> R computeMetric(Metric<? super N,R> key,
                                                                      N node)

Computes a metric identified by its code on a node, with the default options.

Parameters:

key - The key identifying the metric to be computed

node - The node on which to compute the metric

Returns:

The value of the metric, or Double.NaN if the value couldn't be computed

computeMetric

public static <N extends Node,R extends Number> R computeMetric(Metric<? super N,R> key,
                                                                      N node,
                                                                      MetricOptions options)

Computes a metric identified by its code on a node, possibly selecting a variant with the options parameter.

Note that contrary to the previous behaviour, this method throws an exception if the metric does not support the node.

Parameters:

key - The key identifying the metric to be computed

node - The node on which to compute the metric

options - The options of the metric

Returns:

The value of the metric

Throws:

IllegalArgumentException - If the metric does not support the given node

computeMetric

public static <N extends Node,R extends Number> R computeMetric(Metric<? super N,R> key,
                                                                      N node,
                                                                      MetricOptions options,
                                                                      boolean forceRecompute)

Computes a metric identified by its code on a node, possibly selecting a variant with the options parameter.

Note that contrary to the previous behaviour, this method throws an exception if the metric does not support the node.

Parameters:

key - The key identifying the metric to be computed

node - The node on which to compute the metric

options - The options of the metric

forceRecompute - Force recomputation of the result

Returns:

The value of the metric

Throws:

IllegalArgumentException - If the metric does not support the given node