1 package org.apache.lucene.util.packed;
4 * Licensed to the Apache Software Foundation (ASF) under one or more
5 * contributor license agreements. See the NOTICE file distributed with
6 * this work for additional information regarding copyright ownership.
7 * The ASF licenses this file to You under the Apache License, Version 2.0
8 * (the "License"); you may not use this file except in compliance with
9 * the License. You may obtain a copy of the License at
11 * http://www.apache.org/licenses/LICENSE-2.0
13 * Unless required by applicable law or agreed to in writing, software
14 * distributed under the License is distributed on an "AS IS" BASIS,
15 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
16 * See the License for the specific language governing permissions and
17 * limitations under the License.
20 import org.apache.lucene.store.DataInput;
21 import org.apache.lucene.util.RamUsageEstimator;
23 import java.io.IOException;
24 import java.util.Arrays;
27 * Direct wrapping of 16 bit values to a backing array of shorts.
31 class Direct16 extends PackedInts.ReaderImpl
32 implements PackedInts.Mutable {
33 private short[] values;
34 private static final int BITS_PER_VALUE = 16;
36 public Direct16(int valueCount) {
37 super(valueCount, BITS_PER_VALUE);
38 values = new short[valueCount];
41 public Direct16(DataInput in, int valueCount) throws IOException {
42 super(valueCount, BITS_PER_VALUE);
43 short[] values = new short[valueCount];
44 for(int i=0;i<valueCount;i++) {
45 values[i] = in.readShort();
47 final int mod = valueCount % 4;
49 final int pad = 4-mod;
51 for(int i=0;i<pad;i++) {
60 * Creates an array backed by the given values.
62 * Note: The values are used directly, so changes to the values will
63 * affect the structure.
64 * @param values used as the internal backing array.
66 public Direct16(short[] values) {
67 super(values.length, BITS_PER_VALUE);
71 public long get(final int index) {
72 return 0xFFFFL & values[index];
75 public void set(final int index, final long value) {
76 values[index] = (short)(value & 0xFFFF);
79 public long ramBytesUsed() {
80 return RamUsageEstimator.NUM_BYTES_ARRAY_HEADER +
81 values.length * RamUsageEstimator.NUM_BYTES_SHORT;
85 Arrays.fill(values, (short)0);
89 public Object getArray() {
94 public boolean hasArray() {