Comments (6)
It does seem like a gap that we don't have that.
And do we not have a method that composes a Function and a Predicate into a
Predicate? I'm surprised, I thought we had that.
Original comment by [email protected]
on 23 Oct 2007 at 7:15
- Added labels: Type-Enhancement
- Removed labels: Type-Defect
from google-collections.
Original comment by [email protected]
on 27 May 2008 at 6:29
- Added labels: 1.0
from google-collections.
I built an implementation that mirrors the Functions.forPredicate method:
public static <T> Predicate<T> forFunction(Function<T, Boolean> function) {
return new FunctionPredicate<T>(function);
}
private static class FunctionPredicate<T> implements Predicate<T>, Serializable {
private final Function<T, Boolean> function;
private FunctionPredicate(Function<T, Boolean> function) {
this.function = checkNotNull(function);
}
@Override
public boolean apply(T t) {
return function.apply(t);
}
@Override
public boolean equals(Object obj) {
if (obj instanceof FunctionPredicate) {
FunctionPredicate<?> that = (FunctionPredicate<?>) obj;
return function.equals(that.function);
}
return false;
}
@Override
public int hashCode() {
return function.hashCode();
}
@Override
public String toString() {
return "forFunction(" + function + ")";
}
private static final long serialVersionUID = 0;
}
Original comment by seantparsons
on 12 Mar 2009 at 10:24
from google-collections.
Original comment by [email protected]
on 18 Mar 2009 at 2:20
- Removed labels: 1.0
from google-collections.
Original comment by [email protected]
on 17 Sep 2009 at 6:02
- Added labels: Milestone-Post1.0
from google-collections.
This issue has been moved to the Guava project (keeping the same id number).
Simply replace 'google-collections' with 'guava-libraries' in your address
bar and it should take you there.
Original comment by [email protected]
on 5 Jan 2010 at 11:09
- Changed state: Moved
from google-collections.
Related Issues (20)
- Preconditions.checkArgumentNotNull HOT 2
- MapMaker with weak keys: keySet() doubles reference counts in map HOT 4
- broken checksums in maven artefacts for rc4 HOT 6
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- Make com.google.common.collect.ImmutableCollection.Builder public HOT 3
- Easy way to deal with null Iterables when looping HOT 1
- Please provide Sets.symmetricDifference() HOT 3
- static method Functions.toStringFunction() should be parametrized HOT 5
- LinkedListMultimap values should be of type Deque<V> HOT 3
- add transformEntries method to Maps and SortedMaps HOT 4
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- CusomConcurrentHashMap.Values should override toArray(T[]) HOT 2
- with/withoutmethods on immutable collections HOT 2
- OutOfMemoryError when using MapMaker and Soft/Weak-Keys/Values HOT 1
- MemoryLeak(?) when using expiration in MapMaker HOT 2
- equals is not implemented for Collections2.filter HOT 1
- Allow asMap() to return a Map which has defined value Collections HOT 1
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from google-collections.