ListQueryResultAdapter.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.compiler.codegen.CodeLanguage
import androidx.room.compiler.codegen.XCodeBlock
import androidx.room.compiler.codegen.XCodeBlock.Builder.Companion.addLocalVal
import androidx.room.compiler.processing.XType
import androidx.room.ext.CommonTypeNames
import androidx.room.ext.CommonTypeNames.ARRAY_LIST
import androidx.room.ext.KotlinCollectionMemberNames
import androidx.room.solver.CodeGenScope

class ListQueryResultAdapter(
    private val typeArg: XType,
    private val rowAdapter: RowAdapter
) : QueryResultAdapter(listOf(rowAdapter)) {
    override fun convert(outVarName: String, cursorVarName: String, scope: CodeGenScope) {
        scope.builder.apply {
            rowAdapter.onCursorReady(cursorVarName = cursorVarName, scope = scope)
            val listTypeName = CommonTypeNames.MUTABLE_LIST.parametrizedBy(typeArg.asTypeName())
            when (language) {
                CodeLanguage.JAVA -> addLocalVariable(
                    name = outVarName,
                    typeName = listTypeName,
                    assignExpr = XCodeBlock.ofNewInstance(
                        language,
                        ARRAY_LIST.parametrizedBy(typeArg.asTypeName())
                    )
                )
                CodeLanguage.KOTLIN -> addLocalVal(
                    outVarName,
                    listTypeName,
                    "%M()",
                    KotlinCollectionMemberNames.MUTABLE_LIST_OF
                )
            }
            val tmpVarName = scope.getTmpVar("_item")
            val stepName = if (scope.useDriverApi) "step" else "moveToNext"
            beginControlFlow("while (%L.$stepName())", cursorVarName).apply {
                addLocalVariable(
                    name = tmpVarName,
                    typeName = typeArg.asTypeName()
                )
                rowAdapter.convert(tmpVarName, cursorVarName, scope)
                addStatement("%L.add(%L)", outVarName, tmpVarName)
            }
            endControlFlow()
        }
    }

    override fun isMigratedToDriver(): Boolean = rowAdapter.isMigratedToDriver()
}