parquet.column.values.plain.FixedLenByteArrayPlainValuesReader Maven / Gradle / Ivy
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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 parquet.column.values.plain;
import java.io.IOException;
import parquet.Log;
import parquet.column.values.ValuesReader;
import parquet.io.ParquetDecodingException;
import parquet.io.api.Binary;
import static parquet.Log.DEBUG;
/**
* ValuesReader for FIXED_LEN_BYTE_ARRAY.
*
* @author David Z. Chen
*/
public class FixedLenByteArrayPlainValuesReader extends ValuesReader {
private static final Log LOG = Log.getLog(FixedLenByteArrayPlainValuesReader.class);
private byte[] in;
private int offset;
private int length;
public FixedLenByteArrayPlainValuesReader(int length) {
this.length = length;
}
@Override
public Binary readBytes() {
try {
int start = offset;
offset = start + length;
return Binary.fromByteArray(in, start, length);
} catch (RuntimeException e) {
throw new ParquetDecodingException("could not read bytes at offset " + offset, e);
}
}
@Override
public void skip() {
offset += length;
}
@Override
public void initFromPage(int valueCount, byte[] in, int offset)
throws IOException {
if (DEBUG) LOG.debug("init from page at offset "+ offset + " for length " + (in.length - offset));
this.in = in;
this.offset = offset;
}
}