Java File Read via ByteBuffer readColumnarKeyBlockDataForNoDictionaryCols(byte[] columnarKeyBlockData)

Description

read Columnar Key Block Data For No Dictionary Cols

License

Apache License

Parameter

Parameter	Description
columnarKeyBlockData	a parameter
columnarKeyStoreMetadata	a parameter

Declaration

public static List<byte[]> readColumnarKeyBlockDataForNoDictionaryCols(byte[] columnarKeyBlockData) 

Method Source Code

//package com.java2s;
/*// w  w  w  .  j a  v  a2  s.c  om
 * 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 java.nio.ByteBuffer;
import java.util.ArrayList;
import java.util.List;

public class Main {
    /**
     * @param columnarKeyBlockData
     * @param columnarKeyStoreMetadata
     * @return
     * @author s71955 The high cardinality dimensions rows will be send in byte
     * array with its data length appended in the
     * ColumnarKeyStoreDataHolder byte array since high cardinality dim
     * data will not be part of MDKey/Surrogate keys. In this method the
     * byte array will be scanned and the length which is stored in
     * short will be removed.
     */
    public static List<byte[]> readColumnarKeyBlockDataForNoDictionaryCols(byte[] columnarKeyBlockData) {
        List<byte[]> columnarKeyBlockDataList = new ArrayList<byte[]>(50);
        ByteBuffer noDictionaryValKeyStoreDataHolder = ByteBuffer.allocate(columnarKeyBlockData.length);
        noDictionaryValKeyStoreDataHolder.put(columnarKeyBlockData);
        noDictionaryValKeyStoreDataHolder.flip();
        while (noDictionaryValKeyStoreDataHolder.hasRemaining()) {
            short dataLength = noDictionaryValKeyStoreDataHolder.getShort();
            byte[] noDictionaryValKeyData = new byte[dataLength];
            noDictionaryValKeyStoreDataHolder.get(noDictionaryValKeyData);
            columnarKeyBlockDataList.add(noDictionaryValKeyData);
        }
        return columnarKeyBlockDataList;

    }
}

Related

1. readBytes(InputStream is)
2. readBytes(Path file)
3. readBytes(ReadableByteChannel channel, byte[] array)
4. readBytes(String file)
5. readCode(byte[] message)
6. readContent(File file)
7. readContentsNIO(FileInputStream input, String encoding, boolean decodeNIO)
8. readData(String fileName, int size)
9. readDelimitedFromInputStream(InputStream inputStream)