room/compiler/src/main/kotlin/androidx/room/solver/query/result/QueryResultAdapter.kt

/*
 * Copyright (C) 2016 The Android Open Source Project
 *
 * 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 androidx.room.solver.query.result

import androidx.room.solver.CodeGenScope

/**
 * Gets a Cursor and converts it into the return type of a method annotated with @Query.
 */
abstract class QueryResultAdapter(val rowAdapter: RowAdapter?) {

    abstract fun convert(outVarName: String, cursorVarName: String, scope: CodeGenScope)

    // indicates whether the cursor should be copied before converting
    open fun shouldCopyCursor() = rowAdapter is PojoRowAdapter &&
            rowAdapter.relationCollectors.isNotEmpty()

    fun accessedTableNames(): List<String> {
        return (rowAdapter as? PojoRowAdapter)?.relationTableNames() ?: emptyList()
    }
}