Sets and Slice Notation for Java Boon!
If you are new to boon, you might want to start here. Boon is a opinionated, low ceremony Java framework.
Slice notations works with sorted maps and sorted sets.
Set<String> set =
set("apple", "oranges", "pears", "grapes", "kiwi");
assertEquals (5, len( se t)) ;
assertTrue ( in ( "apple", set ) );The above uses in len and in which are universal operators in Boon.
We can even use slice notations with tree sets.
NavigableSet<String> set =
sortedSet("apple", "kiwi", "oranges", "pears", "pineapple");
assertEquals(
5,
len(set)
);
assertTrue(
in("apple", set)
);
assertEquals(
"oranges", idx(set, "ora")
);
assertEquals(
"oranges", idx(set, "o")
);
assertEquals(
"pears",
idx(set, "p")
);
assertEquals(
"pineapple",
idx(set, "pi")
);
assertEquals(
"pineapple",
after(set, "pi")
);
assertEquals(
"pears",
before(set, "pi")
);
assertEquals(
sortedSet("apple", "kiwi"),
slc(set, "ap", "o")
);
assertEquals(
sortedSet("apple", "kiwi"),
slc(set, "o")
);
assertEquals(
sortedSet("oranges", "pears", "pineapple"),
slcEnd(set, "o")
);The above uses in len and in which are universal operators in Boon.
set = sortedSet("apple", "kiwi", "oranges", "pears", "pineapple")
slcEnd( set, "o" ) //returns ("oranges", "pears", "pineapple")
slc( set, "ap", "o" ) //returns ("apple", "kiwi"),
slc( set, "o" ) //returns ("apple", "kiwi")What you are really doing with slicing with treemaps and treesets is a between query of sorts.
What item comes after "pi"?
after(set, "pi") //pineappleAnd before pineapple?
before(set, "pi") Set<String> set = set("apple", "pear", "orange");
Set<String> set2;
set2 = set( copy( set ) );
assertEquals(
set, set2
);
set2 = set( copy( sortedSet( set ) ) );
assertEquals(
set, set2
);
set2 = set( copy( safeSet( set ) ) );
assertEquals(
set, set2
);
set2 = set( copy( safeSortedSet( set ) ) );
assertEquals(
set, set2
);Boon allows you to easily convert from another collection, enumeration, array, etc. into a set.
Set<String> set = set("apple", "pear", "orange");
Set<String> set2 = set(enumeration(set));
assertEquals(
set, set2
);
set2 = sortedSet(enumeration(set));
assertEquals(
set, set2
);
set2 = safeSet(enumeration(set));
assertEquals(
set, set2
);
set2 = safeSortedSet(enumeration(set));
assertEquals(
set, set2
);
Works with itearale too.
Set<String> set3 = set((Iterable)set2);
assertEquals(
set2, set3
);
set3 = sortedSet((Iterable)set2);
assertEquals(
set2, set3
);
set3 = safeSortedSet((Iterable)set2);
assertEquals(
set2, set3
);
set3 = safeSet((Iterable)set2);
assertEquals(
set2, set3
);
Set<String> set4 = set((Collection)set3);
assertEquals(
set3, set4
);
set4 = safeSet((Collection)set3);
assertEquals(
set3, set4
);
set4 = safeSortedSet((Collection)set3);
assertEquals(
set3, set4
);
set4 = sortedSet((Collection)set3);
assertEquals(
set3, set4
);
Set<String> set5 = set(set4.iterator());
assertEquals(
set4, set5
);
set5 = sortedSet(set4.iterator());
assertEquals(
set4, set5
);
set5 = safeSortedSet(set4.iterator());
assertEquals(
set4, set5
);
set5 = safeSet(set4.iterator());
assertEquals(
set4, set5
);
}You can create sets based on the contents of other sets:
assertTrue (
sortedSet("apple", "pear", "orange") .equals(
set("apple", "pear", "orange") ) &&
safeSet("apple", "pear", "orange").equals(
safeSortedSet("apple", "pear", "orange") ) &&
sortedSet("apple", "pear", "orange") .equals(
safeSortedSet("apple", "pear", "orange") )
); Set<String> set = set("apple", "grape", "pears");
Set<String> set2 = set(enumeration(set));
assertEquals(
set, set2
);The universal add works with sets too.
Add an apple
add(set, "apple");
assertTrue(
len(set) == 1
);
assertTrue(
!(set instanceof SortedSet) || idx(set, "a").equals("apple")
);
Set<String> set2 = copy(set);
assertTrue(
!(set2 instanceof SortedSet) || idx(set2, "a").equals("apple")
);
assertTrue(
len(set2) == 1
);Thoughts? Write me at richard high tower AT g mail dot c-o-m (Rick Hightower).
If you are new to boon start here:
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