| /** |
| * 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.sqoop.orm; |
| |
| import java.io.IOException; |
| import java.util.ArrayList; |
| import java.util.List; |
| import java.util.Map; |
| import java.util.Properties; |
| |
| import org.apache.avro.Schema; |
| import org.apache.avro.Schema.Field; |
| import org.apache.avro.Schema.Type; |
| import org.apache.commons.logging.Log; |
| import org.apache.commons.logging.LogFactory; |
| |
| import com.cloudera.sqoop.SqoopOptions; |
| import com.cloudera.sqoop.manager.ConnManager; |
| import org.apache.sqoop.avro.AvroUtil; |
| |
| import org.codehaus.jackson.node.NullNode; |
| |
| /** |
| * Creates an Avro schema to represent a table from a database. |
| */ |
| public class AvroSchemaGenerator { |
| |
| public static final Log LOG = |
| LogFactory.getLog(AvroSchemaGenerator.class.getName()); |
| |
| private final SqoopOptions options; |
| private final ConnManager connManager; |
| private final String tableName; |
| |
| public AvroSchemaGenerator(final SqoopOptions opts, final ConnManager connMgr, |
| final String table) { |
| this.options = opts; |
| this.connManager = connMgr; |
| this.tableName = table; |
| } |
| |
| public Schema generate(String schemaNameOverride) throws IOException { |
| ClassWriter classWriter = new ClassWriter(options, connManager, |
| tableName, null); |
| Map<String, Integer> columnTypes = classWriter.getColumnTypes(); |
| String[] columnNames = classWriter.getColumnNames(columnTypes); |
| |
| List<Field> fields = new ArrayList<Field>(); |
| for (String columnName : columnNames) { |
| String cleanedCol = AvroUtil.toAvroIdentifier(ClassWriter.toJavaIdentifier(columnName)); |
| int sqlType = columnTypes.get(columnName); |
| Schema avroSchema = toAvroSchema(sqlType, columnName); |
| Field field = new Field(cleanedCol, avroSchema, null, NullNode.getInstance()); |
| field.addProp("columnName", columnName); |
| field.addProp("sqlType", Integer.toString(sqlType)); |
| fields.add(field); |
| } |
| |
| TableClassName tableClassName = new TableClassName(options); |
| String shortClassName = tableClassName.getShortClassForTable(tableName); |
| String avroTableName = (tableName == null ? TableClassName.QUERY_RESULT : tableName); |
| String avroName = schemaNameOverride != null ? schemaNameOverride : |
| (shortClassName == null ? avroTableName : shortClassName); |
| String avroNamespace = tableClassName.getPackageForTable(); |
| |
| String doc = "Sqoop import of " + avroTableName; |
| Schema schema = Schema.createRecord(avroName, doc, avroNamespace, false); |
| schema.setFields(fields); |
| schema.addProp("tableName", avroTableName); |
| return schema; |
| } |
| |
| /** |
| * Will create union, because each type is assumed to be nullable. |
| * |
| * @param sqlType Original SQL type (might be overridden by user) |
| * @param columnName Column name from the query |
| * @return Schema |
| */ |
| public Schema toAvroSchema(int sqlType, String columnName) { |
| List<Schema> childSchemas = new ArrayList<Schema>(); |
| childSchemas.add(Schema.create(Schema.Type.NULL)); |
| childSchemas.add(Schema.create(toAvroType(columnName, sqlType))); |
| return Schema.createUnion(childSchemas); |
| } |
| |
| public Schema toAvroSchema(int sqlType) { |
| return toAvroSchema(sqlType, null); |
| } |
| |
| private Type toAvroType(String columnName, int sqlType) { |
| Properties mapping = options.getMapColumnJava(); |
| |
| if (mapping.containsKey(columnName)) { |
| String type = mapping.getProperty(columnName); |
| if (LOG.isDebugEnabled()) { |
| LOG.info("Overriding type of column " + columnName + " to " + type); |
| } |
| |
| if (type.equalsIgnoreCase("INTEGER")) { return Type.INT; } |
| if (type.equalsIgnoreCase("LONG")) { return Type.LONG; } |
| if (type.equalsIgnoreCase("BOOLEAN")) { return Type.BOOLEAN; } |
| if (type.equalsIgnoreCase("FLOAT")) { return Type.FLOAT; } |
| if (type.equalsIgnoreCase("DOUBLE")) { return Type.DOUBLE; } |
| if (type.equalsIgnoreCase("STRING")) { return Type.STRING; } |
| if (type.equalsIgnoreCase("BYTES")) { return Type.BYTES; } |
| |
| // Mapping was not found |
| throw new IllegalArgumentException("Cannot convert to AVRO type " + type); |
| } |
| |
| return connManager.toAvroType(tableName, columnName, sqlType); |
| } |
| } |