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Dataset Java API: Allow passing dataset read options when creating fi…
…le format (apache#30)
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45 changes: 45 additions & 0 deletions
45
java/dataset/src/main/java/org/apache/arrow/dataset/file/format/CsvFileFormat.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,45 @@ | ||
| /* | ||
| * 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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| package org.apache.arrow.dataset.file.format; | ||
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| import org.apache.arrow.dataset.file.JniWrapper; | ||
| import org.apache.arrow.util.Preconditions; | ||
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| import java.util.Collections; | ||
| import java.util.Map; | ||
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| public class CsvFileFormat extends FileFormatBase { | ||
| public CsvFileFormat(char delimiter) { | ||
| super(createCsvFileFormat(delimiter)); | ||
| } | ||
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| // Typically for Spark config parsing | ||
| public static CsvFileFormat create(Map<String, String> options) { | ||
| String delimiter = getOptionValue(options, "delimiter", ","); | ||
| Preconditions.checkArgument(delimiter.length() == 1, "Parameter \"delimiter\" must have length 1"); | ||
| return new CsvFileFormat(delimiter.charAt(0)); | ||
| } | ||
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| public static CsvFileFormat createDefault() { | ||
| return create(Collections.emptyMap()); | ||
| } | ||
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| private static long createCsvFileFormat(char delimiter) { | ||
| return JniWrapper.get().createCsvFileFormat(delimiter); | ||
| } | ||
| } |
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63 changes: 63 additions & 0 deletions
63
java/dataset/src/main/java/org/apache/arrow/dataset/file/format/FileFormatBase.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,63 @@ | ||
| /* | ||
| * 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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| package org.apache.arrow.dataset.file.format; | ||
|
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| import org.apache.arrow.dataset.file.JniWrapper; | ||
|
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| import java.io.IOException; | ||
| import java.util.ArrayList; | ||
| import java.util.List; | ||
| import java.util.Map; | ||
| import java.util.StringTokenizer; | ||
|
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| public abstract class FileFormatBase implements FileFormat { | ||
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| private final long nativeInstanceId; | ||
| private boolean closed = false; | ||
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| public FileFormatBase(long nativeInstanceId) { | ||
| this.nativeInstanceId = nativeInstanceId; | ||
| } | ||
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| protected static String getOptionValue(Map<String, String> options, String key, String fallbackValue) { | ||
| return options.getOrDefault(key, fallbackValue); | ||
| } | ||
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| protected static String[] parseStringArray(String commaSeparated) { | ||
| final StringTokenizer tokenizer = new StringTokenizer(commaSeparated, ","); | ||
| final List<String> tokens = new ArrayList<>(); | ||
| while (tokenizer.hasMoreTokens()) { | ||
| tokens.add(tokenizer.nextToken()); | ||
| } | ||
| return tokens.toArray(new String[0]); | ||
| } | ||
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| @Override | ||
| public long id() { | ||
| return nativeInstanceId; | ||
| } | ||
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| @Override | ||
| public void close() throws IOException { | ||
| if (closed) { | ||
| return; | ||
| } | ||
| closed = true; | ||
| JniWrapper.get().releaseFileFormatInstance(nativeInstanceId); | ||
| } | ||
| } |
46 changes: 46 additions & 0 deletions
46
java/dataset/src/main/java/org/apache/arrow/dataset/file/format/ParquetFileFormat.java
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,46 @@ | ||
| /* | ||
| * 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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| package org.apache.arrow.dataset.file.format; | ||
|
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| import org.apache.arrow.dataset.file.JniWrapper; | ||
|
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| import java.util.Collections; | ||
| import java.util.Map; | ||
|
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| public class ParquetFileFormat extends FileFormatBase { | ||
| private final String[] dictColumns; | ||
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| public ParquetFileFormat(String[] dictColumns) { | ||
| super(createParquetFileFormat(dictColumns)); | ||
| this.dictColumns = dictColumns; | ||
| } | ||
|
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| // Typically for Spark config parsing | ||
| public static ParquetFileFormat create(Map<String, String> options) { | ||
| return new ParquetFileFormat(parseStringArray(getOptionValue(options, "dictColumns", "")) | ||
| ); | ||
| } | ||
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| public static ParquetFileFormat createDefault() { | ||
| return create(Collections.emptyMap()); | ||
| } | ||
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| private static long createParquetFileFormat(String[] dictColumns) { | ||
| return JniWrapper.get().createParquetFileFormat(dictColumns); | ||
| } | ||
| } |
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