org.apache.parquet.example.data.GroupWriter 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
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* specific language governing permissions and limitations
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*/
package org.apache.parquet.example.data;
import org.apache.parquet.io.api.RecordConsumer;
import org.apache.parquet.schema.GroupType;
import org.apache.parquet.schema.Type;
public class GroupWriter {
private final RecordConsumer recordConsumer;
private final GroupType schema;
public GroupWriter(RecordConsumer recordConsumer, GroupType schema) {
this.recordConsumer = recordConsumer;
this.schema = schema;
}
public void write(Group group) {
recordConsumer.startMessage();
writeGroup(group, schema);
recordConsumer.endMessage();
}
private void writeGroup(Group group, GroupType type) {
int fieldCount = type.getFieldCount();
for (int field = 0; field < fieldCount; ++field) {
int valueCount = group.getFieldRepetitionCount(field);
if (valueCount > 0) {
Type fieldType = type.getType(field);
String fieldName = fieldType.getName();
recordConsumer.startField(fieldName, field);
for (int index = 0; index < valueCount; ++index) {
if (fieldType.isPrimitive()) {
group.writeValue(field, index, recordConsumer);
} else {
recordConsumer.startGroup();
writeGroup(group.getGroup(field, index), fieldType.asGroupType());
recordConsumer.endGroup();
}
}
recordConsumer.endField(fieldName, field);
}
}
}
}