Bhanupavansingh created COLLECTIONS-532:
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Summary: MapUtils.predicatedMap(map, keypredicate,valuepredicate)
is not working as expected
Key: COLLECTIONS-532
URL: https://issues.apache.org/jira/browse/COLLECTIONS-532
Project: Commons Collections
Issue Type: Bug
Components: Collection, Map
Affects Versions: 4.0
Environment: ubuntu/java8
Reporter: Bhanupavansingh
I expected that MapUtils.predicatedMap() includes those entries of the
specified map that match the specified key-predicate and specified
value-predicate.I expected that entries that do not match either of the
predicates not included i the returned map.
But in as per the code of org.apache.commons.collections4.map.
PredicatedMap.validate()
protected void validate(final K key, final V value) {
if (keyPredicate != null && keyPredicate.evaluate(key) == false) {
throw new IllegalArgumentException("Cannot add key - Predicate
rejected it");
}
if (valuePredicate != null && valuePredicate.evaluate(value) == false) {
throw new IllegalArgumentException("Cannot add value - Predicate
rejected it");
}
}
if evaluation of key or value predicate fails an IllegalArgumentException is
thrown.
Predicates are passed to input map to test if an entry is to be included or
not. If the evaluation of this predicate itself throws an exception based on
result of predicate, then this method is useless and cannot be used to filter
entries of a map(using predicates)
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