io.druid.segment.IntListUtils.java Source code

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Here is the source code for io.druid.segment.IntListUtils.java

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/*
 * Licensed to Metamarkets Group Inc. (Metamarkets) under one
 * or more contributor license agreements. See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership. Metamarkets 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 io.druid.segment;

import com.google.common.base.Preconditions;
import it.unimi.dsi.fastutil.ints.AbstractIntList;
import it.unimi.dsi.fastutil.ints.IntList;

public class IntListUtils {
    private IntListUtils() {
    }

    public static IntList fromTo(int from, int to) {
        Preconditions.checkArgument(from <= to);
        return new RangeIntList(from, to);
    }

    private static final class RangeIntList extends AbstractIntList {
        private final int start;
        private final int size;

        RangeIntList(int start, int end) {
            this.start = start;
            this.size = end - start;
        }

        @Override
        public int getInt(int index) {
            Preconditions.checkElementIndex(index, size);
            return start + index;
        }

        @Override
        public int size() {
            return size;
        }
    }
}