| /* |
| * 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.carbondata.core.datastore.columnar; |
| |
| import java.util.Arrays; |
| |
| public final class UnBlockIndexer { |
| |
| private UnBlockIndexer() { |
| |
| } |
| |
| public static int[] uncompressIndex(int[] indexData, int[] indexMap) { |
| int actualSize = indexData.length; |
| int mapLength = indexMap.length; |
| if (indexMap.length == 0) { |
| return indexData; |
| } |
| for (int i = 0; i < mapLength; i++) { |
| actualSize += indexData[indexMap[i] + 1] - indexData[indexMap[i]] - 1; |
| } |
| int[] indexes = new int[actualSize]; |
| int k = 0; |
| int oldIndex = 0; |
| for (int i = 0; i < indexData.length; i++) { |
| int index = Arrays.binarySearch(indexMap, oldIndex, mapLength, i); |
| if (index > -1) { |
| oldIndex = index; |
| for (int j = indexData[indexMap[index]]; j <= indexData[indexMap[index] + 1]; j++) { |
| indexes[k] = j; |
| k++; |
| } |
| i++; |
| } else { |
| indexes[k] = indexData[i]; |
| k++; |
| } |
| } |
| return indexes; |
| } |
| |
| public static byte[] uncompressData(byte[] data, int[] index, int keyLen, int dataLength) { |
| if (index.length < 1) { |
| return data; |
| } |
| int numberOfCopy = 0; |
| int actualSize = 0; |
| int srcPos = 0; |
| int destPos = 0; |
| for (int i = 1; i < index.length; i += 2) { |
| actualSize += index[i]; |
| } |
| byte[] uncompressedData = new byte[actualSize * keyLen]; |
| int picIndex = 0; |
| for (int i = 0; i < dataLength; i += keyLen) { |
| numberOfCopy = index[picIndex * 2 + 1]; |
| picIndex++; |
| for (int j = 0; j < numberOfCopy; j++) { |
| System.arraycopy(data, srcPos, uncompressedData, destPos, keyLen); |
| destPos += keyLen; |
| } |
| srcPos += keyLen; |
| } |
| return uncompressedData; |
| } |
| |
| } |