| /* |
| * 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.drill.exec.store.msaccess; |
| |
| import org.apache.drill.shaded.guava.com.google.common.io.Files; |
| import org.apache.drill.common.config.DrillConfig; |
| import org.apache.drill.common.logical.StoragePluginConfig; |
| import org.apache.drill.common.types.TypeProtos; |
| import org.apache.drill.common.types.Types; |
| import org.apache.drill.exec.ExecConstants; |
| import org.apache.drill.exec.physical.impl.scan.v3.file.FileReaderFactory; |
| import org.apache.drill.exec.physical.impl.scan.v3.file.FileScanLifecycleBuilder; |
| import org.apache.drill.exec.physical.impl.scan.v3.file.FileSchemaNegotiator; |
| import org.apache.drill.exec.physical.impl.scan.v3.ManagedReader; |
| import org.apache.drill.exec.server.DrillbitContext; |
| import org.apache.drill.exec.store.dfs.easy.EasyFormatPlugin; |
| import org.apache.drill.exec.store.dfs.easy.EasySubScan; |
| import org.apache.hadoop.conf.Configuration; |
| |
| import java.io.File; |
| |
| |
| public class MSAccessFormatPlugin extends EasyFormatPlugin<MSAccessFormatConfig> { |
| |
| protected static final String DEFAULT_NAME = "msaccess"; |
| private final DrillbitContext context; |
| |
| private static class MSAccessReaderFactory extends FileReaderFactory { |
| |
| private final File tempDir; |
| private final MSAccessFormatConfig config; |
| public MSAccessReaderFactory(File tempDir, MSAccessFormatConfig config) { |
| this.tempDir = tempDir; |
| this.config = config; |
| } |
| |
| @Override |
| public ManagedReader newReader(FileSchemaNegotiator negotiator) { |
| return new MSAccessBatchReader(negotiator, tempDir, config); |
| } |
| } |
| |
| public MSAccessFormatPlugin(String name, DrillbitContext context, |
| Configuration fsConf, StoragePluginConfig storageConfig, |
| MSAccessFormatConfig formatConfig) { |
| super(name, easyConfig(fsConf, formatConfig), context, storageConfig, formatConfig); |
| this.context = context; |
| } |
| |
| private static EasyFormatConfig easyConfig(Configuration fsConf, MSAccessFormatConfig pluginConfig) { |
| return EasyFormatConfig.builder() |
| .readable(true) |
| .writable(false) |
| .blockSplittable(false) |
| .blockSplittable(false) |
| .compressible(true) |
| .supportsProjectPushdown(true) |
| .extensions(pluginConfig.getExtensions()) |
| .fsConf(fsConf) |
| .defaultName(DEFAULT_NAME) |
| .scanVersion(ScanFrameworkVersion.EVF_V2) |
| .supportsLimitPushdown(true) |
| .build(); |
| } |
| |
| @Override |
| protected void configureScan(FileScanLifecycleBuilder builder, EasySubScan scan) { |
| builder.nullType(Types.optional(TypeProtos.MinorType.VARCHAR)); |
| builder.readerFactory(new MSAccessReaderFactory(getTmpDir(), formatConfig)); |
| } |
| |
| /** |
| * First tries to get drill temporary directory value from config ${drill.tmp-dir}, |
| * then checks environmental variable $DRILL_TMP_DIR. |
| * If value is still missing, generates directory using {@link Files#createTempDir()}. |
| * |
| * @return drill temporary directory path |
| */ |
| protected File getTmpDir() { |
| DrillConfig config = context.getConfig(); |
| String drillTempDir; |
| if (config.hasPath(ExecConstants.DRILL_TMP_DIR)) { |
| drillTempDir = config.getString(ExecConstants.DRILL_TMP_DIR); |
| } else { |
| drillTempDir = System.getenv("DRILL_TMP_DIR"); |
| } |
| |
| if (drillTempDir == null) { |
| return Files.createTempDir(); |
| } |
| return new File(drillTempDir); |
| } |
| } |