/**
* 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.hadoop.hive.serde2.objectinspector;
import java.lang.reflect.Method;
import java.lang.reflect.Type;
public class ThriftObjectInspectorUtils {
/**
* Returns generic type for a field in a Thrift class. The type is the return
* type for the accessor method for the field (e.g. <code>isFieldName()</code>
* for a boolean type or <code>getFieldName</code> for other types). The return
* type works for both structs and unions. Reflecting directly based on
* fields does not work for unions.
*
* @return generic {@link Type} of the thrift field.
*/
public static Type getFieldType(Class<?> containingClass, String fieldName) {
String suffix = // uppercase first letter
fieldName.substring(0, 1).toUpperCase() + fieldName.substring(1);
// look for getFieldName() or isFieldName()
for(String prefix : new String[]{"get", "is"}) {
try {
Method method = containingClass.getDeclaredMethod(prefix + suffix);
return method.getGenericReturnType();
} catch (NoSuchMethodException e) {
}
}
// look for bean style accessors get_fieldName and is_fieldName
for(String prefix : new String[]{"get_", "is_"}) {
try {
Method method = containingClass.getDeclaredMethod(prefix + fieldName);
return method.getGenericReturnType();
} catch (NoSuchMethodException e) {
}
}
throw new RuntimeException("Could not find type for " + fieldName +
" in " + containingClass);
}
}