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Mongodb support for Querydsl

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/*
 * Copyright 2020 the original author or authors.
 *
 * 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.mongodb.document;

import com.querydsl.core.JoinType;
import com.querydsl.core.support.QueryMixin;
import com.querydsl.core.types.ExpressionUtils;
import com.querydsl.core.types.Path;
import com.querydsl.core.types.Predicate;

/**
 * {@code JoinBuilder} is a builder for join constraints
 *
 * @author Mark Paluch
 * @param 
 * @param 
 */
public class JoinBuilder, T> {

  private final QueryMixin queryMixin;

  private final Path ref;

  private final Path target;

  public JoinBuilder(QueryMixin queryMixin, Path ref, Path target) {
    this.queryMixin = queryMixin;
    this.ref = ref;
    this.target = target;
  }

  @SuppressWarnings("unchecked")
  public Q on(Predicate... conditions) {
    queryMixin.addJoin(JoinType.JOIN, ExpressionUtils.as((Path) ref, target));
    queryMixin.on(conditions);
    return queryMixin.getSelf();
  }
}