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.IndexInput;
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
*/
public 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(IndexInput 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 int[] getArray() {
return 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);
}
}