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From "Bhanupavansingh (JIRA)" <j...@apache.org>
Subject [jira] [Created] (COLLECTIONS-532) MapUtils.predicatedMap(map, keypredicate,valuepredicate) is not working as expected
Date Fri, 30 May 2014 10:28:01 GMT
Bhanupavansingh created COLLECTIONS-532:
-------------------------------------------

             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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