com.zeoflow.depot.processor.QueryRewriter.kt Maven / Gradle / Ivy

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The Depot persistence library provides an abstraction layer over SQLite to allow for more robust database access while using the full power of SQLite.

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/*
 * Copyright (C) 2021 ZeoFlow SRL
 *
 * 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.zeoflow.depot.processor

import com.zeoflow.depot.parser.ParsedQuery
import com.zeoflow.depot.solver.query.result.RowAdapter

/**
 * Interface to rewrite user queries
 */
interface QueryRewriter {
    /**
     * Rewrites the user given query. This is a place where we can run optimizations etc on the
     * user query.
     */
    fun rewrite(query: ParsedQuery, rowAdapter: RowAdapter): ParsedQuery

    companion object {
        val NoOpRewriter = object : QueryRewriter {
            override fun rewrite(query: ParsedQuery, rowAdapter: RowAdapter) = query
        }
    }
}