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AbstractChunkReader.java
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AbstractChunkReader.java
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/*
* 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.chunk.reader.dimension;
import org.apache.carbondata.core.constants.CarbonCommonConstants;
import org.apache.carbondata.core.datastore.chunk.reader.DimensionColumnChunkReader;
import org.apache.carbondata.core.datastore.compression.Compressor;
import org.apache.carbondata.core.keygenerator.mdkey.NumberCompressor;
import org.apache.carbondata.core.util.CarbonProperties;
/**
* Class which will have all the common properties and behavior among all type
* of reader
*/
public abstract class AbstractChunkReader implements DimensionColumnChunkReader {
/**
* compressor will be used to uncompress the data
*/
protected Compressor compressor;
/**
* size of the each column value
* for no dictionary column it will be -1
*/
protected int[] eachColumnValueSize;
/**
* full qualified path of the data file from
* which data will be read
*/
protected String filePath;
/**
* this will be used to uncompress the
* row id and rle chunk
*/
protected NumberCompressor numberComressor;
/**
* number of element in each chunk
*/
protected int numberOfRows;
/**
* Constructor to get minimum parameter to create
* instance of this class
*
* @param eachColumnValueSize size of the each column value
* @param filePath file from which data will be read
*/
public AbstractChunkReader(final int[] eachColumnValueSize, final String filePath,
int numberOfRows) {
this.eachColumnValueSize = eachColumnValueSize;
this.filePath = filePath;
int numberOfElement = 0;
try {
numberOfElement = Integer.parseInt(CarbonProperties.getInstance()
.getProperty(CarbonCommonConstants.BLOCKLET_SIZE,
CarbonCommonConstants.BLOCKLET_SIZE_DEFAULT_VAL));
} catch (NumberFormatException exception) {
numberOfElement = Integer.parseInt(CarbonCommonConstants.BLOCKLET_SIZE_DEFAULT_VAL);
}
this.numberComressor = new NumberCompressor(numberOfElement);
this.numberOfRows = numberOfRows;
}
}