| /* |
| * 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.xml.xsd; |
| |
| import org.apache.drill.common.types.TypeProtos.MinorType; |
| import org.apache.drill.exec.record.metadata.SchemaBuilder; |
| import org.apache.drill.exec.record.metadata.TupleMetadata; |
| import com.google.common.annotations.VisibleForTesting; |
| import com.google.common.collect.ImmutableMap; |
| import org.apache.ws.commons.schema.XmlSchema; |
| import org.apache.ws.commons.schema.XmlSchemaCollection; |
| import org.apache.ws.commons.schema.XmlSchemaElement; |
| |
| import org.apache.ws.commons.schema.XmlSchemaObject; |
| import org.apache.ws.commons.schema.walker.XmlSchemaWalker; |
| import org.slf4j.Logger; |
| import org.slf4j.LoggerFactory; |
| |
| import javax.xml.transform.stream.StreamSource; |
| import java.io.IOException; |
| import java.io.InputStream; |
| import java.nio.file.Files; |
| import java.nio.file.Paths; |
| |
| public class DrillXSDSchemaUtils { |
| private static final MinorType DEFAULT_TYPE = MinorType.VARCHAR; |
| private static final Logger logger = LoggerFactory.getLogger(DrillXSDSchemaUtils.class); |
| |
| /** |
| * This map maps the data types defined by the XSD definition to Drill data types. |
| */ |
| public static final ImmutableMap<String, MinorType> XML_TYPE_MAPPINGS = ImmutableMap.<String, MinorType>builder() |
| .put("BASE64BINARY", MinorType.VARBINARY) |
| .put("BOOLEAN", MinorType.BIT) |
| .put("DATE", MinorType.DATE) |
| .put("DATETIME", MinorType.TIMESTAMP) |
| .put("DECIMAL", MinorType.VARDECIMAL) |
| .put("DOUBLE", MinorType.FLOAT8) |
| .put("DURATION", MinorType.INTERVAL) |
| .put("FLOAT", MinorType.FLOAT4) |
| .put("HEXBINARY", MinorType.VARBINARY) |
| .put("STRING", MinorType.VARCHAR) |
| .put("TIME", MinorType.TIME) |
| .build(); |
| |
| /** |
| * This function is only used for testing, but accepts a XSD file as input rather than a {@link InputStream} |
| * @param filename A {@link String} containing an XSD file. |
| * @return A {@link TupleMetadata} containing a Drill representation of the XSD schema. |
| * @throws IOException If anything goes wrong or the file is not found. |
| */ |
| @VisibleForTesting |
| public static TupleMetadata getSchema(String filename) throws IOException { |
| InputStream inputStream = Files.newInputStream(Paths.get(filename)); |
| return processSchema(inputStream); |
| } |
| |
| /** |
| * Returns a {@link TupleMetadata} of the schema from an XSD file from an InputStream. |
| * @param inputStream A {@link InputStream} containing an XSD file. |
| * @return A {@link TupleMetadata} of the schema from the XSD file. |
| */ |
| public static TupleMetadata getSchema(InputStream inputStream) { |
| return processSchema(inputStream); |
| } |
| |
| private static TupleMetadata processSchema(InputStream inputStream) { |
| XmlSchemaCollection schemaCollection = new XmlSchemaCollection(); |
| schemaCollection.read(new StreamSource(inputStream)); |
| |
| DrillXSDSchemaVisitor schemaVisitor = new DrillXSDSchemaVisitor(new SchemaBuilder()); |
| XmlSchema[] schemas = schemaCollection.getXmlSchemas(); |
| XmlSchemaWalker walker = new XmlSchemaWalker(schemaCollection, schemaVisitor); |
| |
| // Walk all the schemata. |
| for (XmlSchema schema : schemas) { |
| for (XmlSchemaObject schemaObject : schema.getItems()) { |
| if (schemaObject instanceof XmlSchemaElement) { |
| walker.walk((XmlSchemaElement) schemaObject); |
| } |
| } |
| } |
| return schemaVisitor.getDrillSchema(); |
| } |
| |
| /** |
| * Returns a {@link MinorType} of the corresponding XML Data Type. Defaults to VARCHAR if unknown |
| * @param xmlType A String of the XML Data Type |
| * @return A {@link MinorType} of the Drill data type. |
| */ |
| public static MinorType getDrillDataType(String xmlType) { |
| try { |
| MinorType type = DrillXSDSchemaUtils.XML_TYPE_MAPPINGS.get(xmlType); |
| if (type == null) { |
| return DEFAULT_TYPE; |
| } else { |
| return type; |
| } |
| } catch (NullPointerException e) { |
| logger.warn("Unknown data type found in XSD reader: {}. Returning VARCHAR.", xmlType); |
| return DEFAULT_TYPE; |
| } |
| } |
| } |