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/*
* 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.sql.Timestamp;
import java.util.List;
import org.apache.calcite.rel.type.RelDataType;
import org.apache.calcite.rel.type.RelDataTypeFactory;
import org.apache.calcite.sql.type.SqlTypeName;
import com.google.common.collect.Lists;
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<SqlTypeName> types = Lists.newArrayList();
private final List<String> names = Lists.newArrayList();
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());
if (type == int.class || type == Integer.class) {
types.add(SqlTypeName.INTEGER);
} else if(type == boolean.class || type == Boolean.class) {
types.add(SqlTypeName.BOOLEAN);
} else if(type == long.class || type == Long.class) {
types.add(SqlTypeName.BIGINT);
} else if(type == double.class || type == Double.class) {
types.add(SqlTypeName.DOUBLE);
} else if(type == String.class) {
types.add(SqlTypeName.VARCHAR);
} else if(type.isEnum()) {
types.add(SqlTypeName.VARCHAR);
} else if (type == Timestamp.class) {
types.add(SqlTypeName.TIMESTAMP);
} else {
throw new RuntimeException(String.format("PojoDataType doesn't yet support conversions from type [%s].", type));
}
}
}
public Class<?> getPojoClass() {
return pojoClass;
}
@Override
public List<SqlTypeName> getFieldSqlTypeNames() {
return types;
}
@Override
public List<String> getFieldNames() {
return names;
}
}
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