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SQL support for Querydsl

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/*
 * 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 
 */
public class WithBuilder {

  private final QueryMixin queryMixin;

  private final Expression alias;

  public WithBuilder(QueryMixin 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));
  }
}