runtime.intrinsic._unique.java Source code

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Here is the source code for runtime.intrinsic._unique.java

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/**
 * ADOBE SYSTEMS INCORPORATED
 * Copyright 2009-2013 Adobe Systems Incorporated
 * All Rights Reserved.
 *
 * NOTICE: Adobe permits you to use, modify, and distribute
 * this file in accordance with the terms of the MIT license,
 * a copy of which can be found in the LICENSE.txt file or at
 * http://opensource.org/licenses/MIT.
 */
package runtime.intrinsic;

import com.google.common.collect.Sets;
import runtime.rep.list.ListValue;
import runtime.rep.list.PersistentList;

import java.util.Set;

/**
 * Return sublist of unique items from list.
 * Like {@link _distinct}, but not order preserving.
 *
 * @author Basil Hosmer
 */
public final class _unique extends IntrinsicLambda {
    public static final _unique INSTANCE = new _unique();
    public static final String NAME = "unique";

    public String getName() {
        return NAME;
    }

    public Object apply(final Object arg) {
        return invoke((ListValue) arg);
    }

    public static ListValue invoke(final ListValue list) {
        final Set<?> set = Sets.newHashSet(list.iterator());
        return PersistentList.init(set.iterator(), set.size());
    }
}