| /* |
| * 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.LuceneTestCase; |
| import org.apache.lucene.util.TestUtil; |
| import org.apache.lucene.util.packed.PackedInts; |
| |
| public class TestForDeltaUtil 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 - 7); |
| for (int j = 0; j < ForUtil.BLOCK_SIZE; ++j) { |
| values[i * ForUtil.BLOCK_SIZE + j] = |
| RandomNumbers.randomIntBetween(random(), 1, (int) PackedInts.maxValue(bpv)); |
| } |
| } |
| |
| final Directory d = new ByteBuffersDirectory(); |
| final long endPointer; |
| |
| { |
| // encode |
| IndexOutput out = d.createOutput("test.bin", IOContext.DEFAULT); |
| final ForDeltaUtil forDeltaUtil = new ForDeltaUtil(new ForUtil()); |
| |
| for (int i = 0; i < iterations; ++i) { |
| long[] source = new long[ForUtil.BLOCK_SIZE]; |
| for (int j = 0; j < ForUtil.BLOCK_SIZE; ++j) { |
| source[j] = values[i * ForUtil.BLOCK_SIZE + j]; |
| } |
| forDeltaUtil.encodeDeltas(source, out); |
| } |
| endPointer = out.getFilePointer(); |
| out.close(); |
| } |
| |
| { |
| // decode |
| IndexInput in = d.openInput("test.bin", IOContext.READONCE); |
| final ForDeltaUtil forDeltaUtil = new ForDeltaUtil(new ForUtil()); |
| for (int i = 0; i < iterations; ++i) { |
| if (random().nextInt(5) == 0) { |
| forDeltaUtil.skip(in); |
| continue; |
| } |
| long base = 0; |
| final long[] restored = new long[ForUtil.BLOCK_SIZE]; |
| forDeltaUtil.decodeAndPrefixSum(in, base, restored); |
| final long[] expected = new long[ForUtil.BLOCK_SIZE]; |
| for (int j = 0; j < ForUtil.BLOCK_SIZE; ++j) { |
| expected[j] = values[i * ForUtil.BLOCK_SIZE + j]; |
| if (j > 0) { |
| expected[j] += expected[j - 1]; |
| } else { |
| expected[j] += base; |
| } |
| } |
| assertArrayEquals(Arrays.toString(restored), expected, restored); |
| } |
| assertEquals(endPointer, in.getFilePointer()); |
| in.close(); |
| } |
| |
| d.close(); |
| } |
| } |