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Implement a geoparquet writer (#899)
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138 changes: 138 additions & 0 deletions
138
baremaps-geoparquet/src/main/java/org/apache/baremaps/geoparquet/GeoParquetWriteSupport.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,138 @@ | ||
| /* | ||
| * 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.baremaps.geoparquet; | ||
|
|
||
| import com.fasterxml.jackson.core.JsonProcessingException; | ||
| import com.fasterxml.jackson.databind.ObjectMapper; | ||
| import java.util.HashMap; | ||
| import java.util.Map; | ||
| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.parquet.hadoop.api.WriteSupport; | ||
| import org.apache.parquet.io.api.Binary; | ||
| import org.apache.parquet.io.api.RecordConsumer; | ||
| import org.apache.parquet.schema.*; | ||
|
|
||
| /** | ||
| * WriteSupport implementation for writing GeoParquetGroup instances to Parquet. | ||
| */ | ||
| public class GeoParquetWriteSupport extends WriteSupport<GeoParquetGroup> { | ||
|
|
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| private Configuration configuration; | ||
| private final MessageType schema; | ||
| private final GeoParquetMetadata metadata; | ||
| private RecordConsumer recordConsumer; | ||
| private final ObjectMapper objectMapper = new ObjectMapper(); | ||
|
|
||
| /** | ||
| * Constructs a new GeoParquetWriteSupport. | ||
| * | ||
| * @param schema the Parquet schema | ||
| * @param metadata the GeoParquet metadata | ||
| */ | ||
| public GeoParquetWriteSupport(MessageType schema, GeoParquetMetadata metadata) { | ||
| this.schema = schema; | ||
| this.metadata = metadata; | ||
| } | ||
|
|
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| @Override | ||
| public WriteContext init(Configuration configuration) { | ||
| Map<String, String> extraMetadata = new HashMap<>(); | ||
| String geoMetadataJson = serializeMetadata(metadata); | ||
| extraMetadata.put("geo", geoMetadataJson); | ||
| return new WriteContext(schema, extraMetadata); | ||
| } | ||
|
|
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| @Override | ||
| public void prepareForWrite(RecordConsumer recordConsumer) { | ||
| this.recordConsumer = recordConsumer; | ||
| } | ||
|
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| @Override | ||
| public void write(GeoParquetGroup group) { | ||
| recordConsumer.startMessage(); | ||
| writeGroup(group, schema, true); | ||
| recordConsumer.endMessage(); | ||
| } | ||
|
|
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| private void writeGroup(GeoParquetGroup group, GroupType groupType, boolean isRoot) { | ||
| if (!isRoot) { | ||
| recordConsumer.startGroup(); | ||
| } | ||
| for (int i = 0; i < groupType.getFieldCount(); i++) { | ||
| Type fieldType = groupType.getType(i); | ||
| String fieldName = fieldType.getName(); | ||
| int repetitionCount = group.getFieldRepetitionCount(i); | ||
| if (repetitionCount == 0) { | ||
| continue; // Skip if no values are present | ||
| } | ||
| for (int j = 0; j < repetitionCount; j++) { | ||
| recordConsumer.startField(fieldName, i); | ||
| if (fieldType.isPrimitive()) { | ||
| Object value = group.getValue(i, j); | ||
| writePrimitive(value, fieldType.asPrimitiveType()); | ||
| } else { | ||
| GeoParquetGroup childGroup = group.getGroup(i, j); | ||
| writeGroup(childGroup, fieldType.asGroupType(), false); | ||
| } | ||
| recordConsumer.endField(fieldName, i); | ||
| } | ||
| } | ||
| if (!isRoot) { | ||
| recordConsumer.endGroup(); | ||
| } | ||
| } | ||
|
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| private void writePrimitive(Object value, PrimitiveType primitiveType) { | ||
| if (value == null) { | ||
| // The Parquet format does not support writing null values directly. | ||
| // If the field is optional and the value is null, we simply do not write it. | ||
| return; | ||
| } | ||
| switch (primitiveType.getPrimitiveTypeName()) { | ||
| case INT32: | ||
| recordConsumer.addInteger((Integer) value); | ||
| break; | ||
| case INT64: | ||
| recordConsumer.addLong((Long) value); | ||
| break; | ||
| case FLOAT: | ||
| recordConsumer.addFloat((Float) value); | ||
| break; | ||
| case DOUBLE: | ||
| recordConsumer.addDouble((Double) value); | ||
| break; | ||
| case BOOLEAN: | ||
| recordConsumer.addBoolean((Boolean) value); | ||
| break; | ||
| case BINARY, FIXED_LEN_BYTE_ARRAY: | ||
| recordConsumer.addBinary((Binary) value); | ||
| break; | ||
| default: | ||
| throw new GeoParquetException( | ||
| "Unsupported type: " + primitiveType.getPrimitiveTypeName()); | ||
| } | ||
| } | ||
|
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| private String serializeMetadata(GeoParquetMetadata metadata) { | ||
| try { | ||
| return objectMapper.writeValueAsString(metadata); | ||
| } catch (JsonProcessingException e) { | ||
| throw new GeoParquetException("Failed to serialize GeoParquet metadata", e); | ||
| } | ||
| } | ||
| } |
98 changes: 98 additions & 0 deletions
98
baremaps-geoparquet/src/main/java/org/apache/baremaps/geoparquet/GeoParquetWriter.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,98 @@ | ||
| /* | ||
| * 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.baremaps.geoparquet; | ||
|
|
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| import org.apache.hadoop.conf.Configuration; | ||
| import org.apache.hadoop.fs.Path; | ||
| import org.apache.parquet.conf.ParquetConfiguration; | ||
| import org.apache.parquet.hadoop.ParquetWriter; | ||
| import org.apache.parquet.hadoop.api.WriteSupport; | ||
| import org.apache.parquet.schema.MessageType; | ||
|
|
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| /** | ||
| * A writer for GeoParquet files that writes GeoParquetGroup instances to a Parquet file. | ||
| */ | ||
| public class GeoParquetWriter { | ||
|
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| private GeoParquetWriter() { | ||
| // Prevent instantiation | ||
| } | ||
|
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| public static Builder builder(Path file) { | ||
| return new Builder(file); | ||
| } | ||
|
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| public static class Builder | ||
| extends ParquetWriter.Builder<GeoParquetGroup, GeoParquetWriter.Builder> { | ||
|
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| private MessageType type = null; | ||
|
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| private GeoParquetMetadata metadata = null; | ||
|
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| private Builder(Path file) { | ||
| super(file); | ||
| } | ||
|
|
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| /** | ||
| * Replace the message type with the specified one. | ||
| * | ||
| * @param type the message type | ||
| * @return the builder | ||
| */ | ||
| public GeoParquetWriter.Builder withType(MessageType type) { | ||
| this.type = type; | ||
| return this; | ||
| } | ||
|
|
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| /** | ||
| * Replace the metadata with the specified one. | ||
| * | ||
| * @param metadata the metadata | ||
| * @return the builder | ||
| */ | ||
| public GeoParquetWriter.Builder withGeoParquetMetadata(GeoParquetMetadata metadata) { | ||
| this.metadata = metadata; | ||
| return this; | ||
| } | ||
|
|
||
| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| protected WriteSupport<GeoParquetGroup> getWriteSupport(Configuration conf) { | ||
| // We don't need access to the hadoop configuration for now | ||
| return getWriteSupport((ParquetConfiguration) null); | ||
| } | ||
|
|
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| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| protected WriteSupport<GeoParquetGroup> getWriteSupport(ParquetConfiguration conf) { | ||
| return new GeoParquetWriteSupport(type, metadata); | ||
| } | ||
|
|
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| /** | ||
| * {@inheritDoc} | ||
| */ | ||
| @Override | ||
| protected GeoParquetWriter.Builder self() { | ||
| return this; | ||
| } | ||
| } | ||
| } |
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