org.apache.druid.collections.IntSetTestUtility.java Source code

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Here is the source code for org.apache.druid.collections.IntSetTestUtility.java

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/*
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package org.apache.druid.collections;

import com.google.common.collect.Lists;
import com.google.common.collect.Sets;
import org.apache.druid.collections.bitmap.ImmutableBitmap;
import org.apache.druid.collections.bitmap.MutableBitmap;
import org.roaringbitmap.IntIterator;

import java.util.BitSet;
import java.util.HashSet;
import java.util.Iterator;
import java.util.Set;

/**
 *
 */
public class IntSetTestUtility {

    private static Set<Integer> setBits = Sets.newTreeSet(Lists.newArrayList(1, 2, 3, 5, 8, 13, 21));

    public static Set<Integer> getSetBits() {
        return Sets.newTreeSet(setBits);
    }

    public static final BitSet createSimpleBitSet(Set<Integer> setBits) {
        BitSet retval = new BitSet();
        for (int i : setBits) {
            retval.set(i);
        }
        return retval;
    }

    public static final void addAllToMutable(MutableBitmap mutableBitmap, Iterable<Integer> intSet) {
        for (Integer integer : intSet) {
            mutableBitmap.add(integer);
        }
    }

    public static Boolean equalSets(Set<Integer> s1, ImmutableBitmap s2) {
        Set<Integer> s3 = new HashSet<>();
        for (Integer i : new IntIt(s2.iterator())) {
            s3.add(i);
        }
        return Sets.difference(s1, s3).isEmpty();
    }

    private static class IntIt implements Iterable<Integer> {
        private final Iterator<Integer> intIter;

        public IntIt(IntIterator intIt) {
            this.intIter = new IntIter(intIt);
        }

        @Override
        public Iterator<Integer> iterator() {
            return intIter;
        }

        private static class IntIter implements Iterator<Integer> {
            private final IntIterator intIt;

            public IntIter(IntIterator intIt) {
                this.intIt = intIt;
            }

            @Override
            public boolean hasNext() {
                return intIt.hasNext();
            }

            @Override
            public Integer next() {
                return intIt.next();
            }

            @Override
            public void remove() {
                throw new UnsupportedOperationException("Cannot remove ints from int iterator");
            }
        }
    }
}