/*
* Copyright 2016, Red Hat Inc. and/or its affiliates.
*
* Licensed 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.infinispan.objectfilter.impl.ql;
/**
* Represents a canonical join type.
* <p/>
* Note that currently HQL really only supports inner and left outer joins
* (though cross joins can also be achieved). This is because joins in HQL
* are always defined in relation to a mapped association. However, when we
* start allowing users to specify ad-hoc joins this may need to change to
* allow the full spectrum of join types. Thus the others are provided here
* currently just for completeness and for future expansion.
*
* @author Steve Ebersole
* @since 9.0
*/
public enum JoinType {
/**
* Represents an inner join.
*/
INNER("inner"),
/**
* Represents a left outer join.
*/
LEFT("left outer"),
/**
* Represents a right outer join.
*/
RIGHT("right outer"),
/**
* Represents a cross join (aka a cartesian product).
*/
CROSS("cross"),
/**
* Represents a full join.
*/
FULL("full");
private final String name;
JoinType(String name) {
this.name = name;
}
@Override
public String toString() {
return name;
}
}