/**
* 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.typeinfo;
import java.io.Serializable;
import org.apache.hadoop.hive.serde2.objectinspector.ObjectInspector.Category;
/**
* Stores information about a type. Always use the TypeInfoFactory to create new
* TypeInfo objects.
*
* We support 8 categories of types:
* 1. Primitive objects (String, Number, etc)
* 2. List objects (a list of objects of a single type)
* 3. Map objects (a map from objects of one type to objects of another type)
* 4. Struct objects (a list of fields with names and their own types)
* 5. Union objects
* 6. Decimal objects
* 7. Char objects
* 8. Varchar objects
*/
public abstract class TypeInfo implements Serializable {
private static final long serialVersionUID = 1L;
protected TypeInfo() {
}
/**
* The Category of this TypeInfo. Possible values are Primitive, List, Map,
* Struct and Union, which corresponds to the 5 sub-classes of TypeInfo.
*/
public abstract Category getCategory();
/**
* A String representation of the TypeInfo.
*/
public abstract String getTypeName();
/**
* String representing the qualified type name.
* Qualified types should override this method.
* @return
*/
public String getQualifiedName() {
return getTypeName();
}
@Override
public String toString() {
return getTypeName();
}
@Override
public abstract boolean equals(Object o);
@Override
public abstract int hashCode();
public boolean accept(TypeInfo other) {
return this.equals(other);
}
}