parquet.column.page.Page Maven / Gradle / Ivy
/**
* Copyright 2012 Twitter, Inc.
*
* Licensed 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 parquet.column.page;
import parquet.Log;
import parquet.bytes.BytesInput;
import parquet.column.Encoding;
import parquet.column.statistics.Statistics;
import parquet.column.statistics.BooleanStatistics;
/**
* one page in a chunk
*
* @author Julien Le Dem
*
*/
public class Page {
private static final boolean DEBUG = Log.DEBUG;
private static final Log LOG = Log.getLog(Page.class);
private static int nextId = 0;
private final BytesInput bytes;
private final int valueCount;
private final int uncompressedSize;
private final Statistics statistics;
private final Encoding rlEncoding;
private final Encoding dlEncoding;
private final Encoding valuesEncoding;
private final int id;
@Deprecated
/**
* @param bytes the bytes for this page
* @param valueCount count of values in this page
* @param uncompressedSize the uncompressed size of the page
* @param rlEncoding the repetition level encoding for this page
* @param dlEncoding the definition level encoding for this page
* @param valuesEncoding the values encoding for this page
* @param dlEncoding
*/
public Page(BytesInput bytes, int valueCount, int uncompressedSize, Encoding rlEncoding, Encoding dlEncoding, Encoding valuesEncoding) {
this.bytes = bytes;
this.valueCount = valueCount;
this.uncompressedSize = uncompressedSize;
this.statistics = new BooleanStatistics();
this.rlEncoding = rlEncoding;
this.dlEncoding = dlEncoding;
this.valuesEncoding = valuesEncoding;
this.id = nextId ++;
if (DEBUG) LOG.debug("new Page #"+id+" : " + bytes.size() + " bytes and " + valueCount + " records");
}
/**
* @param bytes the bytes for this page
* @param valueCount count of values in this page
* @param uncompressedSize the uncompressed size of the page
* @param statistics of the page's values (max, min, num_null)
* @param rlEncoding the repetition level encoding for this page
* @param dlEncoding the definition level encoding for this page
* @param valuesEncoding the values encoding for this page
* @param dlEncoding
*/
public Page(BytesInput bytes, int valueCount, int uncompressedSize, Statistics stats, Encoding rlEncoding, Encoding dlEncoding, Encoding valuesEncoding) {
this.bytes = bytes;
this.valueCount = valueCount;
this.uncompressedSize = uncompressedSize;
this.statistics = stats;
this.rlEncoding = rlEncoding;
this.dlEncoding = dlEncoding;
this.valuesEncoding = valuesEncoding;
this.id = nextId ++;
if (DEBUG) LOG.debug("new Page #"+id+" : " + bytes.size() + " bytes and " + valueCount + " records");
}
/**
*
* @return the bytes for the page
*/
public BytesInput getBytes() {
return bytes;
}
/**
*
* @return the number of values in that page
*/
public int getValueCount() {
return valueCount;
}
/**
*
* @return the uncompressed size of the page when the bytes are compressed
*/
public int getUncompressedSize() {
return uncompressedSize;
}
/**
*
* @return the statistics for this page (max, min, num_nulls)
*/
public Statistics getStatistics() {
return statistics;
}
/**
* @return the definition level encoding for this page
*/
public Encoding getDlEncoding() {
return dlEncoding;
}
/**
* @return the repetition level encoding for this page
*/
public Encoding getRlEncoding() {
return rlEncoding;
}
/**
* @return the values encoding for this page
*/
public Encoding getValueEncoding() {
return valuesEncoding;
}
@Override
public String toString() {
return "Page [id: " + id + ", bytes.size=" + bytes.size() + ", valueCount=" + valueCount + ", uncompressedSize=" + uncompressedSize + "]";
}
}