SingleNamedColumnRowAdapter.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.ext.L
import androidx.room.ext.RoomTypeNames
import androidx.room.ext.S
import androidx.room.ext.T
import androidx.room.solver.CodeGenScope
import androidx.room.solver.types.CursorValueReader
import com.squareup.javapoet.TypeName
/**
* Wraps a row adapter for a single item from a known column result.
*/
class SingleNamedColumnRowAdapter(
val reader: CursorValueReader,
val columnName: String,
) : RowAdapter(reader.typeMirror()), QueryMappedRowAdapter {
override val mapping = SingleNamedColumnRowMapping(columnName)
lateinit var indexVarName: String
override fun onCursorReady(cursorVarName: String, scope: CodeGenScope) {
indexVarName = scope.getTmpVar(
"_columnIndexOf$columnName"
)
val indexMethod = "getColumnIndexOrThrow"
scope.builder().addStatement(
"final $T $L = $T.$L($L, $S)",
TypeName.INT,
indexVarName,
RoomTypeNames.CURSOR_UTIL,
indexMethod,
cursorVarName,
columnName
)
}
override fun convert(outVarName: String, cursorVarName: String, scope: CodeGenScope) {
reader.readFromCursor(outVarName, cursorVarName, indexVarName, scope)
}
data class SingleNamedColumnRowMapping(
val usedColumn: String
) : QueryMappedRowAdapter.Mapping() {
override val usedColumns = listOf(usedColumn)
}
}