| /* |
| * 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.pojo; |
| |
| import java.lang.reflect.Field; |
| import java.lang.reflect.Modifier; |
| import java.math.BigDecimal; |
| import java.sql.Timestamp; |
| import java.util.AbstractMap.SimpleImmutableEntry; |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| import org.apache.calcite.sql.type.SqlTypeName; |
| import org.apache.drill.exec.store.RecordDataType; |
| |
| /** |
| * This class uses reflection of a Java class to construct a {@link org.apache.drill.exec.store.RecordDataType}. |
| */ |
| public class PojoDataType extends RecordDataType { |
| // private static final org.slf4j.Logger logger = org.slf4j.LoggerFactory.getLogger(PojoDataType.class); |
| |
| private final List<SimpleImmutableEntry<SqlTypeName, Boolean>> types = new ArrayList<>(); |
| private final List<String> names = new ArrayList<>(); |
| private final Class<?> pojoClass; |
| |
| public PojoDataType(Class<?> pojoClass) { |
| this.pojoClass = pojoClass; |
| for (Field f : pojoClass.getDeclaredFields()) { |
| if (Modifier.isStatic(f.getModifiers())) { |
| continue; |
| } |
| |
| Class<?> type = f.getType(); |
| names.add(f.getName()); |
| |
| //Absence of annotation @NonNullable => (isNullable=true) |
| final boolean isNullable = !(f.isAnnotationPresent(NonNullable.class)); |
| |
| if (type == int.class || type == Integer.class) { |
| types.add(new SimpleImmutableEntry<SqlTypeName, Boolean>(SqlTypeName.INTEGER, isNullable)); |
| } else if(type == boolean.class || type == Boolean.class) { |
| types.add(new SimpleImmutableEntry<SqlTypeName, Boolean>(SqlTypeName.BOOLEAN, isNullable)); |
| } else if(type == long.class || type == Long.class) { |
| types.add(new SimpleImmutableEntry<SqlTypeName, Boolean>(SqlTypeName.BIGINT, isNullable)); |
| } else if(type == double.class || type == Double.class) { |
| types.add(new SimpleImmutableEntry<SqlTypeName, Boolean>(SqlTypeName.DOUBLE, isNullable)); |
| } else if(type == BigDecimal.class) { |
| types.add(new SimpleImmutableEntry<SqlTypeName, Boolean>(SqlTypeName.DECIMAL, isNullable)); |
| } else if(type == String.class) { |
| types.add(new SimpleImmutableEntry<SqlTypeName, Boolean>(SqlTypeName.VARCHAR, isNullable)); |
| } else if(type.isEnum()) { |
| types.add(new SimpleImmutableEntry<SqlTypeName, Boolean>(SqlTypeName.VARCHAR, isNullable)); |
| } else if (type == Timestamp.class) { |
| types.add(new SimpleImmutableEntry<SqlTypeName, Boolean>(SqlTypeName.TIMESTAMP, isNullable)); |
| } else { |
| throw new RuntimeException(String.format("PojoDataType doesn't yet support conversions from type [%s].", type)); |
| } |
| } |
| } |
| |
| public Class<?> getPojoClass() { |
| return pojoClass; |
| } |
| |
| @Override |
| public List<SimpleImmutableEntry<SqlTypeName, Boolean>> getFieldSqlTypeNames() { |
| return types; |
| } |
| |
| @Override |
| public List<String> getFieldNames() { |
| return names; |
| } |
| } |