io.druid.segment.data.RangeIndexedInts.java Source code

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Here is the source code for io.druid.segment.data.RangeIndexedInts.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.data;

import com.google.common.base.Preconditions;
import io.druid.query.monomorphicprocessing.RuntimeShapeInspector;

import java.io.IOException;

/**
 * An IndexedInts that always returns [0, 1, ..., N].
 */
public class RangeIndexedInts implements IndexedInts {
    private static final int CACHE_LIMIT = 8;
    private static final RangeIndexedInts[] CACHE = new RangeIndexedInts[CACHE_LIMIT];

    static {
        for (int i = 0; i < CACHE_LIMIT; i++) {
            CACHE[i] = new RangeIndexedInts(i);
        }
    }

    private final int size;

    private RangeIndexedInts(int size) {
        this.size = size;
    }

    public static RangeIndexedInts create(final int size) {
        Preconditions.checkArgument(size >= 0, "size >= 0");
        if (size < CACHE_LIMIT) {
            return CACHE[size];
        } else {
            return new RangeIndexedInts(size);
        }
    }

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

    @Override
    public int get(int index) {
        if (index < 0 || index >= size) {
            throw new IndexOutOfBoundsException("index: " + index);
        }
        return index;
    }

    @Override
    public void close() throws IOException {
    }

    @Override
    public void inspectRuntimeShape(RuntimeShapeInspector inspector) {
        // nothing to inspect
    }
}