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*
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// Portions Copyright [2019] Payara Foundation and/or affiliates
package org.glassfish.admin.amx.util;
import java.util.Arrays;
import java.util.Collection;
import java.util.Collections;
import java.util.HashSet;
import java.util.Set;
/**
Utilities for working with sets using JDK 1.5 generics.
*/
public final class SetUtil
{
private SetUtil()
{
// disallow instantiation
}
public static T getSingleton(final Set s)
{
if (s.size() != 1)
{
throw new IllegalArgumentException(s.toString());
}
return (s.iterator().next());
}
public static void addArray(
final Set set,
final T[] array)
{
for (final T item : array)
{
set.add(item);
}
}
public static Set newSet()
{
return new HashSet();
}
public static Set newSet(final Collection c)
{
final HashSet set = new HashSet();
set.addAll(c);
return (set);
}
/**
Create a new Set with one member.
*/
public static Set newSet(final T item)
{
final Set set = new HashSet();
set.add(item);
return (set);
}
/**
Create a new Set containing all members of another.
The returned Set is always a HashSet.
*/
public static HashSet copySet(final Set s1)
{
final HashSet set = new HashSet();
set.addAll(s1);
return (set);
}
public static Set newSet(
final T m1,
final T m2)
{
final HashSet set = new HashSet();
set.add(m1);
set.add(m2);
return (set);
}
public static Set newSet(final T m1, final T m2, final T m3, final T m4) {
final HashSet set = new HashSet();
set.add(m1);
set.add(m2);
set.add(m3);
set.add(m4);
return (set);
}
/**
Create a new Set containing all array elements.
*/
public static Set newSet(final T[] objects)
{
return (newSet(objects, 0, objects.length));
}
public static Set newSet(final Set s1, final Set s2)
{
final Set both = new HashSet();
both.addAll(s1);
both.addAll(s2);
return both;
}
/**
Create a new Set containing all array elements.
*/
public static Set newSet(
final T[] objects,
final int startIndex,
final int numItems)
{
final Set set = new HashSet();
for (int i = 0; i < numItems; ++i)
{
set.add(objects[startIndex + i]);
}
return (set);
}
/**
Convert a Set to a String[]
*/
public static String[] toStringArray(final Set s)
{
final String[] strings = new String[s.size()];
int i = 0;
for (final Object o : s)
{
strings[i] = "" + o;
++i;
}
return (strings);
}
public static String[] toSortedStringArray(final Set s)
{
final String[] strings = toStringArray(s);
Arrays.sort(strings);
return (strings);
}
public static Set newStringSet(final String... args)
{
return newUnmodifiableSet(args);
}
public static Set newUnmodifiableSet(final T... args)
{
final Set set = new HashSet();
for (final T s : args)
{
set.add(s);
}
return set;
}
public static Set newUnmodifiableStringSet(final String... args)
{
return Collections.unmodifiableSet(newStringSet(args));
}
public static Set newTypedSet(final T... args)
{
final Set set = new HashSet();
for (final T o : args)
{
set.add(o);
}
return set;
}
/**
Create a new Set with one member. Additional items
may be added.
*/
public static Set newSingletonSet(final T m1)
{
final Set set = new HashSet();
set.add(m1);
return (set);
}
/**
Return a new Set of all items in both set1 and set2.
*/
public static Set intersectSets(
final Set set1,
final Set set2)
{
final Set result = newSet(set1);
result.retainAll(set2);
return (result);
}
/**
Return a new Set of all items in set1 not in set2.
*/
public static Set removeSet(
final Set set1,
final Set set2)
{
final Set result = new HashSet();
result.addAll(set1);
result.removeAll(set2);
return (result);
}
/**
Return a new Set of all items not common to both sets.
*/
public static Set newNotCommonSet(
final Set set1,
final Set set2)
{
final Set result = newSet(set1, set2);
final Set common = intersectSets(set1, set2);
result.removeAll(common);
return (result);
}
public static String findIgnoreCase(final Set candidates, final String target)
{
String match = null;
// case-insensitive search
for (final String candidate : candidates)
{
if (candidate.equalsIgnoreCase(target))
{
match = candidate;
break;
}
}
return match;
}
}