content: package org.apache.lucene.util.packed;
  
  /**
   * 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.
   */
  
  import org.apache.lucene.store.DataInput;
  import org.apache.lucene.util.RamUsageEstimator;
  
  import java.io.IOException;
  import java.util.Arrays;
  
  /**
   * Direct wrapping of 32 bit values to a backing array of ints.
   * @lucene.internal
   */
  
  class Direct32 extends PackedInts.ReaderImpl
          implements PackedInts.Mutable {
    private int[] values;
    private static final int BITS_PER_VALUE = 32;
  
    public Direct32(int valueCount) {
      super(valueCount, BITS_PER_VALUE);
      values = new int[valueCount];
    }
  
    public Direct32(DataInput in, int valueCount) throws IOException {
      super(valueCount, BITS_PER_VALUE);
      int[] values = new int[valueCount];
      for(int i=0;i<valueCount;i++) {
        values[i] = in.readInt();
      }
      final int mod = valueCount % 2;
      if (mod != 0) {
        in.readInt();
      }
  
      this.values = values;
    }
  
    /**
     * Creates an array backed by the given values.
     * </p><p>
     * Note: The values are used directly, so changes to the given values will
     * affect the structure.
     * @param values   used as the internal backing array.
     */
    public Direct32(int[] values) {
      super(values.length, BITS_PER_VALUE);
      this.values = values;
    }
  
    public long get(final int index) {
      return 0xFFFFFFFFL & values[index];
    }
  
    public void set(final int index, final long value) {
      values[index] = (int)(value & 0xFFFFFFFF);
    }
  
    public long ramBytesUsed() {
      return RamUsageEstimator.NUM_BYTES_ARRAY_HEADER +
              values.length * RamUsageEstimator.NUM_BYTES_INT;
    }
  
    public void clear() {
      Arrays.fill(values, 0);
    }
    
    @Override
    public int[] getArray() {
      return values;
    }
  
    @Override
    public boolean hasArray() {
      return true;
    }
  }
  