| /* |
| * 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. |
| */ |
| package org.apache.lucene.backward_codecs.lucene84; |
| |
| import com.carrotsearch.randomizedtesting.generators.RandomNumbers; |
| import java.io.IOException; |
| import java.util.Arrays; |
| import org.apache.lucene.store.ByteBuffersDirectory; |
| import org.apache.lucene.store.Directory; |
| import org.apache.lucene.store.IOContext; |
| import org.apache.lucene.store.IndexInput; |
| import org.apache.lucene.store.IndexOutput; |
| import org.apache.lucene.util.ArrayUtil; |
| import org.apache.lucene.util.LuceneTestCase; |
| import org.apache.lucene.util.TestUtil; |
| import org.apache.lucene.util.packed.PackedInts; |
| |
| public class TestForUtil extends LuceneTestCase { |
| |
| public void testEncodeDecode() throws IOException { |
| final int iterations = RandomNumbers.randomIntBetween(random(), 50, 1000); |
| final int[] values = new int[iterations * ForUtil.BLOCK_SIZE]; |
| |
| for (int i = 0; i < iterations; ++i) { |
| final int bpv = TestUtil.nextInt(random(), 1, 31); |
| for (int j = 0; j < ForUtil.BLOCK_SIZE; ++j) { |
| values[i * ForUtil.BLOCK_SIZE + j] = |
| RandomNumbers.randomIntBetween(random(), 0, (int) PackedInts.maxValue(bpv)); |
| } |
| } |
| |
| final Directory d = new ByteBuffersDirectory(); |
| final long endPointer; |
| |
| { |
| // encode |
| IndexOutput out = d.createOutput("test.bin", IOContext.DEFAULT); |
| final ForUtil forUtil = new ForUtil(); |
| |
| for (int i = 0; i < iterations; ++i) { |
| long[] source = new long[ForUtil.BLOCK_SIZE]; |
| long or = 0; |
| for (int j = 0; j < ForUtil.BLOCK_SIZE; ++j) { |
| source[j] = values[i * ForUtil.BLOCK_SIZE + j]; |
| or |= source[j]; |
| } |
| final int bpv = PackedInts.bitsRequired(or); |
| out.writeByte((byte) bpv); |
| forUtil.encode(source, bpv, out); |
| } |
| endPointer = out.getFilePointer(); |
| out.close(); |
| } |
| |
| { |
| // decode |
| IndexInput in = d.openInput("test.bin", IOContext.READONCE); |
| final ForUtil forUtil = new ForUtil(); |
| for (int i = 0; i < iterations; ++i) { |
| final int bitsPerValue = in.readByte(); |
| final long currentFilePointer = in.getFilePointer(); |
| final long[] restored = new long[ForUtil.BLOCK_SIZE]; |
| forUtil.decode(bitsPerValue, in, restored); |
| int[] ints = new int[ForUtil.BLOCK_SIZE]; |
| for (int j = 0; j < ForUtil.BLOCK_SIZE; ++j) { |
| ints[j] = Math.toIntExact(restored[j]); |
| } |
| assertArrayEquals( |
| Arrays.toString(ints), |
| ArrayUtil.copyOfSubArray(values, i * ForUtil.BLOCK_SIZE, (i + 1) * ForUtil.BLOCK_SIZE), |
| ints); |
| assertEquals(forUtil.numBytes(bitsPerValue), in.getFilePointer() - currentFilePointer); |
| } |
| assertEquals(endPointer, in.getFilePointer()); |
| in.close(); |
| } |
| |
| d.close(); |
| } |
| } |