| /* |
| * 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.spss; |
| |
| import com.bedatadriven.spss.SpssDataFileReader; |
| import com.bedatadriven.spss.SpssVariable; |
| import org.apache.drill.common.AutoCloseables; |
| import org.apache.drill.common.exceptions.CustomErrorContext; |
| import org.apache.drill.common.exceptions.UserException; |
| import org.apache.drill.common.types.TypeProtos; |
| import org.apache.drill.exec.physical.impl.scan.file.FileScanFramework.FileSchemaNegotiator; |
| import org.apache.drill.exec.physical.impl.scan.framework.ManagedReader; |
| import org.apache.drill.exec.physical.resultSet.ResultSetLoader; |
| import org.apache.drill.exec.physical.resultSet.RowSetLoader; |
| import org.apache.drill.exec.record.metadata.SchemaBuilder; |
| import org.apache.drill.exec.record.metadata.TupleMetadata; |
| import org.apache.drill.exec.vector.accessor.ScalarWriter; |
| import org.apache.hadoop.mapred.FileSplit; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| |
| public class SpssBatchReader implements ManagedReader<FileSchemaNegotiator> { |
| |
| private static final Logger logger = LoggerFactory.getLogger(SpssBatchReader.class); |
| |
| private static final String VALUE_LABEL = "_value"; |
| |
| private FileSplit split; |
| |
| private InputStream fsStream; |
| |
| private SpssDataFileReader spssReader; |
| |
| private RowSetLoader rowWriter; |
| |
| private List<SpssVariable> variableList; |
| |
| private List<SpssColumnWriter> writerList; |
| |
| private CustomErrorContext errorContext; |
| |
| |
| public static class SpssReaderConfig { |
| |
| protected final SpssFormatPlugin plugin; |
| |
| public SpssReaderConfig(SpssFormatPlugin plugin) { |
| this.plugin = plugin; |
| } |
| } |
| |
| @Override |
| public boolean open(FileSchemaNegotiator negotiator) { |
| split = negotiator.split(); |
| openFile(negotiator); |
| negotiator.tableSchema(buildSchema(), true); |
| errorContext = negotiator.parentErrorContext(); |
| ResultSetLoader loader = negotiator.build(); |
| rowWriter = loader.writer(); |
| buildReaderList(); |
| |
| return true; |
| } |
| |
| @Override |
| public boolean next() { |
| while (!rowWriter.isFull()) { |
| if (!processNextRow()) { |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| @Override |
| public void close() { |
| if (fsStream != null) { |
| AutoCloseables.closeSilently(fsStream); |
| fsStream = null; |
| } |
| } |
| |
| private void openFile(FileSchemaNegotiator negotiator) { |
| try { |
| fsStream = negotiator.fileSystem().openPossiblyCompressedStream(split.getPath()); |
| spssReader = new SpssDataFileReader(fsStream); |
| } catch (IOException e) { |
| throw UserException |
| .dataReadError(e) |
| .message("Unable to open SPSS File %s", split.getPath()) |
| .addContext(e.getMessage()) |
| .addContext(errorContext) |
| .build(logger); |
| } |
| } |
| |
| private boolean processNextRow() { |
| try { |
| // Stop reading when you run out of data |
| if (!spssReader.readNextCase()) { |
| return false; |
| } |
| |
| rowWriter.start(); |
| for (SpssColumnWriter spssColumnWriter : writerList) { |
| spssColumnWriter.load(spssReader); |
| } |
| rowWriter.save(); |
| |
| } catch (IOException e) { |
| throw UserException |
| .dataReadError(e) |
| .message("Error reading SPSS File.") |
| .addContext(errorContext) |
| .build(logger); |
| } |
| return true; |
| } |
| |
| private TupleMetadata buildSchema() { |
| SchemaBuilder builder = new SchemaBuilder(); |
| variableList = spssReader.getVariables(); |
| |
| for (SpssVariable variable : variableList) { |
| String varName = variable.getVariableName(); |
| |
| if (variable.isNumeric()) { |
| builder.addNullable(varName, TypeProtos.MinorType.FLOAT8); |
| |
| // Check if the column has lookups associated with it |
| if (variable.getValueLabels() != null && variable.getValueLabels().size() > 0) { |
| builder.addNullable(varName + VALUE_LABEL, TypeProtos.MinorType.VARCHAR); |
| } |
| |
| } else { |
| builder.addNullable(varName, TypeProtos.MinorType.VARCHAR); |
| } |
| } |
| return builder.buildSchema(); |
| } |
| |
| private void buildReaderList() { |
| writerList = new ArrayList<>(); |
| |
| for (SpssVariable variable : variableList) { |
| if (variable.isNumeric()) { |
| writerList.add(new NumericSpssColumnWriter(variable.getIndex(), variable.getVariableName(), rowWriter, spssReader)); |
| } else { |
| writerList.add(new StringSpssColumnWriter(variable.getIndex(), variable.getVariableName(), rowWriter)); |
| } |
| } |
| } |
| |
| public abstract static class SpssColumnWriter { |
| final String columnName; |
| final ScalarWriter writer; |
| final int columnIndex; |
| |
| public SpssColumnWriter(int columnIndex, String columnName, ScalarWriter writer) { |
| this.columnIndex = columnIndex; |
| this.columnName = columnName; |
| this.writer = writer; |
| } |
| |
| public abstract void load (SpssDataFileReader reader); |
| } |
| |
| public static class StringSpssColumnWriter extends SpssColumnWriter { |
| |
| StringSpssColumnWriter (int columnIndex, String columnName, RowSetLoader rowWriter) { |
| super(columnIndex, columnName, rowWriter.scalar(columnName)); |
| } |
| |
| @Override |
| public void load(SpssDataFileReader reader) { |
| writer.setString(reader.getStringValue(columnIndex)); |
| } |
| } |
| |
| public static class NumericSpssColumnWriter extends SpssColumnWriter { |
| |
| ScalarWriter labelWriter; |
| Map<Double, String> labels; |
| |
| NumericSpssColumnWriter(int columnIndex, String columnName, RowSetLoader rowWriter, SpssDataFileReader reader) { |
| super(columnIndex, columnName, rowWriter.scalar(columnName)); |
| |
| if (reader.getValueLabels(columnName) != null && reader.getValueLabels(columnName).size() != 0) { |
| labelWriter = rowWriter.scalar(columnName + VALUE_LABEL); |
| labels = reader.getValueLabels(columnIndex); |
| } |
| } |
| |
| @Override |
| public void load(SpssDataFileReader reader) { |
| double value = reader.getDoubleValue(columnIndex); |
| |
| if (labelWriter != null) { |
| String labelValue = labels.get(value); |
| if (labelValue == null) { |
| labelWriter.setNull(); |
| } else { |
| labelWriter.setString(labelValue); |
| } |
| } |
| writer.setDouble(value); |
| } |
| } |
| } |