parent
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commit
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@ -63,6 +63,8 @@ public class CollectionUtils {
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*/
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private static class CardinalityHelper<O> {
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private static final Integer ZERO = Integer.valueOf(0);
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/** Contains the cardinality for each object in collection A. */
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final Map<O, Integer> cardinalityA;
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@ -81,28 +83,26 @@ public class CollectionUtils {
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/**
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* Returns the frequency of this object in collection A.
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* @param obj the object
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*
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* @param key the key whose associated frequency is to be returned.
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* @return the frequency of the object in collection A
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*/
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public int freqA(final Object obj) {
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return getFreq(obj, cardinalityA);
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public int freqA(final Object key) {
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return getFreq(key, cardinalityA);
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}
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/**
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* Returns the frequency of this object in collection B.
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* @param obj the object
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*
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* @param key the key whose associated frequency is to be returned.
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* @return the frequency of the object in collection B
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*/
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public int freqB(final Object obj) {
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return getFreq(obj, cardinalityB);
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public int freqB(final Object key) {
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return getFreq(key, cardinalityB);
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}
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private int getFreq(final Object obj, final Map<?, Integer> freqMap) {
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final Integer count = freqMap.get(obj);
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if (count != null) {
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return count.intValue();
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}
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return 0;
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private int getFreq(final Object key, final Map<?, Integer> freqMap) {
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return freqMap.getOrDefault(key, ZERO).intValue();
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}
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/**
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