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Add isNotNullOrEmpty to Strings. #8

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Merged
tonymorris merged 2 commits into from
Aug 26, 2011
Merged

Add isNotNullOrEmpty to Strings. #8

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6b35d99
Add isNotNullOrEmpty to Strings.
magro Aug 26, 2011
3dceccb
Add Ord.hashOrd - an order instance that uses hashCode() for computin…
magro Aug 26, 2011
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21 changes: 21 additions & 0 deletions core/src/main/java/fj/Ord.java
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Original file line number Diff line number Diff line change
Expand Up @@ -637,4 +637,25 @@ public Ordering f(final A a2) {
}
});
}

/**
* An order instance that uses {@link Object#hashCode()} for computing the order.
*
* @return An order instance that is based on {@link Object#hashCode()}.
*/
public static <A> Ord<A> hashOrd() {
return Ord.<A> ord(new F<A, F<A, Ordering>>() {
@Override
public F<A, Ordering> f(final A a) {
return new F<A, Ordering>() {
@Override
public Ordering f(final A a2) {
final int x = a.hashCode() - a2.hashCode();
return x < 0 ? Ordering.LT : x == 0 ? Ordering.EQ : Ordering.GT;
}
};
}
});
}

}
10 changes: 10 additions & 0 deletions core/src/main/java/fj/function/Strings.java
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Original file line number Diff line number Diff line change
Expand Up @@ -14,6 +14,16 @@ private Strings() {
throw new UnsupportedOperationException();
}

/**
* This function checks if a given String is neither <code>null</code> nor empty.
*/
public static final F<String, Boolean> isNotNullOrEmpty = new F<String, Boolean>() {
@Override
public Boolean f(final String a) {
return a != null && a.length() > 0;
}
};

/**
* A curried version of {@link String#isEmpty()}.
*/
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