InstantPreparedQueryResultBinder.kt

/*
 * Copyright 2018 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.prepared.binder

import androidx.room.compiler.codegen.CodeLanguage
import androidx.room.compiler.codegen.XCodeBlock
import androidx.room.compiler.codegen.XCodeBlock.Builder.Companion.addLocalVal
import androidx.room.compiler.codegen.XMemberName.Companion.packageMember
import androidx.room.compiler.codegen.XPropertySpec
import androidx.room.compiler.codegen.XTypeName
import androidx.room.compiler.codegen.box
import androidx.room.ext.InvokeWithLambdaParameter
import androidx.room.ext.LambdaSpec
import androidx.room.ext.RoomTypeNames
import androidx.room.ext.SQLiteDriverTypeNames
import androidx.room.solver.CodeGenScope
import androidx.room.solver.prepared.result.PreparedQueryResultAdapter

/**
 * Default binder for prepared queries.
 */
class InstantPreparedQueryResultBinder(
    adapter: PreparedQueryResultAdapter?
) : PreparedQueryResultBinder(adapter) {

    override fun executeAndReturn(
        prepareQueryStmtBlock: CodeGenScope.() -> String,
        preparedStmtProperty: XPropertySpec?,
        dbProperty: XPropertySpec,
        scope: CodeGenScope
    ) {
        scope.builder.apply {
            addStatement("%N.assertNotSuspendingTransaction()", dbProperty)
        }
        adapter?.executeAndReturn(
            stmtQueryVal = scope.prepareQueryStmtBlock(),
            preparedStmtProperty = preparedStmtProperty,
            dbProperty = dbProperty,
            scope = scope
        )
    }

    override fun isMigratedToDriver(): Boolean = true

    override fun executeAndReturn(
        sqlQueryVar: String,
        dbProperty: XPropertySpec,
        bindStatement: CodeGenScope.(String) -> Unit,
        returnTypeName: XTypeName,
        scope: CodeGenScope
    ) {
        val connectionVar = scope.getTmpVar("_connection")
        val performBlock = InvokeWithLambdaParameter(
            scope = scope,
            functionName = RoomTypeNames.DB_UTIL.packageMember("performBlocking"),
            argFormat = listOf("%N", "%L", "%L"),
            args = listOf(dbProperty, /* isReadOnly = */ false, /* inTransaction = */ true),
            lambdaSpec = object : LambdaSpec(
                parameterTypeName = SQLiteDriverTypeNames.CONNECTION,
                parameterName = connectionVar,
                returnTypeName = returnTypeName.box(),
                javaLambdaSyntaxAvailable = scope.javaLambdaSyntaxAvailable
            ) {
                override fun XCodeBlock.Builder.body(scope: CodeGenScope) {
                    val statementVar = scope.getTmpVar("_stmt")
                    addLocalVal(
                        statementVar,
                        SQLiteDriverTypeNames.STATEMENT,
                        "%L.prepare(%L)",
                        connectionVar,
                        sqlQueryVar
                    )
                    beginControlFlow("try")
                    bindStatement(scope, statementVar)
                    adapter?.executeAndReturn(connectionVar, statementVar, scope)
                    nextControlFlow("finally")
                    addStatement("%L.close()", statementVar)
                    endControlFlow()
                }
            }
        )
        val returnPrefix = when (scope.language) {
            CodeLanguage.JAVA -> if (returnTypeName == XTypeName.UNIT_VOID) "" else "return "
            CodeLanguage.KOTLIN -> "return "
        }
        scope.builder.add("$returnPrefix%L", performBlock)
    }
}