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common/src/main/java/org/apache/arrow/c/CometSchemaImporter.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. | ||
| */ | ||
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|
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| package org.apache.arrow.c; | ||
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| import org.apache.arrow.memory.BufferAllocator; | ||
| import org.apache.arrow.vector.FieldVector; | ||
| import org.apache.arrow.vector.types.pojo.Field; | ||
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| /** This is a simple wrapper around SchemaImporter to make it accessible from Java Arrow. */ | ||
| public class CometSchemaImporter { | ||
| private final BufferAllocator allocator; | ||
| private final SchemaImporter importer; | ||
| private final CDataDictionaryProvider provider = new CDataDictionaryProvider(); | ||
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| public CometSchemaImporter(BufferAllocator allocator) { | ||
| this.allocator = allocator; | ||
| this.importer = new SchemaImporter(allocator); | ||
| } | ||
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| public BufferAllocator getAllocator() { | ||
| return allocator; | ||
| } | ||
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| public CDataDictionaryProvider getProvider() { | ||
| return provider; | ||
| } | ||
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| public Field importField(ArrowSchema schema) { | ||
| try { | ||
| return importer.importField(schema, provider); | ||
| } finally { | ||
| schema.release(); | ||
| schema.close(); | ||
| } | ||
| } | ||
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| /** | ||
| * Imports data from ArrowArray/ArrowSchema into a FieldVector. This is basically the same as Java | ||
| * Arrow `Data.importVector`. `Data.importVector` initiates `SchemaImporter` internally which is | ||
| * used to fill dictionary ids for dictionary encoded vectors. Every call to `importVector` will | ||
| * begin with dictionary ids starting from 0. So, separate calls to `importVector` will overwrite | ||
| * dictionary ids. To avoid this, we need to use the same `SchemaImporter` instance for all calls | ||
| * to `importVector`. | ||
| */ | ||
| public FieldVector importVector(ArrowArray array, ArrowSchema schema) { | ||
| Field field = importField(schema); | ||
| FieldVector vector = field.createVector(allocator); | ||
| Data.importIntoVector(allocator, array, vector, provider); | ||
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| return vector; | ||
| } | ||
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| public void close() { | ||
| provider.close(); | ||
| } | ||
| } |
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