/*
* Copyright 2015, The Querydsl Team (http://www.querydsl.com/team)
*
* 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 com.querydsl.sql;
import com.querydsl.core.QueryFlag;
import com.querydsl.core.support.QueryMixin;
import com.querydsl.core.types.Expression;
import com.querydsl.core.types.ExpressionUtils;
/**
* {@code WithBuilder} is a builder for common table expressions
*
* @author tiwe
*
* @param <R>
*/
public class WithBuilder<R> {
private final QueryMixin<R> queryMixin;
private final Expression<?> alias;
public WithBuilder(QueryMixin<R> queryMixin, Expression<?> alias) {
this.queryMixin = queryMixin;
this.alias = alias;
}
public R as(Expression<?> expr) {
Expression<?> flag = ExpressionUtils.operation(alias.getType(), SQLOps.WITH_ALIAS, alias, expr);
return queryMixin.addFlag(new QueryFlag(QueryFlag.Position.WITH, flag));
}
}