room/compiler/src/main/kotlin/android/arch/persistence/room/solver/query/result/InstantQueryResultBinder.kt

/*
 * Copyright (C) 2017 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 android.arch.persistence.room.solver.query.result

import android.arch.persistence.room.ext.AndroidTypeNames
import android.arch.persistence.room.ext.L
import android.arch.persistence.room.ext.N
import android.arch.persistence.room.ext.T
import android.arch.persistence.room.solver.CodeGenScope
import android.arch.persistence.room.writer.DaoWriter
import com.squareup.javapoet.FieldSpec

/**
 * Instantly runs and returns the query.
 */
class InstantQueryResultBinder(adapter: QueryResultAdapter?) : QueryResultBinder(adapter) {
    override fun convertAndReturn(roomSQLiteQueryVar : String, dbField: FieldSpec,
                                  scope: CodeGenScope) {
        scope.builder().apply {
            val outVar = scope.getTmpVar("_result")
            val cursorVar = scope.getTmpVar("_cursor")
            addStatement("final $T $L = $N.query($L)", AndroidTypeNames.CURSOR, cursorVar,
                    DaoWriter.dbField, roomSQLiteQueryVar)
            beginControlFlow("try").apply {
                adapter?.convert(outVar, cursorVar, scope)
                addStatement("return $L", outVar)
            }
            nextControlFlow("finally").apply {
                addStatement("$L.close()", cursorVar)
                addStatement("$L.release()", roomSQLiteQueryVar)
            }
            endControlFlow()
        }
    }
}