StringColumnTypeAdapter.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.types
import androidx.room.compiler.processing.XProcessingEnv
import androidx.room.compiler.processing.XType
import androidx.room.ext.CommonTypeNames
import androidx.room.ext.L
import androidx.room.parser.SQLTypeAffinity.TEXT
import androidx.room.solver.CodeGenScope
class StringColumnTypeAdapter private constructor(
out: XType
) : ColumnTypeAdapter(out = out, typeAffinity = TEXT) {
override fun readFromCursor(
outVarName: String,
cursorVarName: String,
indexVarName: String,
scope: CodeGenScope
) {
scope.builder().apply {
// according to docs, getString might throw if the value is null
// https://developer.android.com/reference/android/database/Cursor#getString(int)
beginControlFlow("if ($L.isNull($L))", cursorVarName, indexVarName).apply {
addStatement("$L = null", outVarName)
}
nextControlFlow("else").apply {
addStatement("$L = $L.getString($L)", outVarName, cursorVarName, indexVarName)
}
endControlFlow()
}
}
override fun bindToStmt(
stmtName: String,
indexVarName: String,
valueVarName: String,
scope: CodeGenScope
) {
scope.builder().apply {
beginControlFlow("if ($L == null)", valueVarName)
.addStatement("$L.bindNull($L)", stmtName, indexVarName)
nextControlFlow("else")
.addStatement("$L.bindString($L, $L)", stmtName, indexVarName, valueVarName)
endControlFlow()
}
}
companion object {
fun create(env: XProcessingEnv): List<StringColumnTypeAdapter> {
val stringType = env.requireType(CommonTypeNames.STRING)
return if (env.backend == XProcessingEnv.Backend.KSP) {
listOf(
StringColumnTypeAdapter(stringType.makeNonNullable()),
StringColumnTypeAdapter(stringType.makeNullable()),
)
} else {
listOf(
StringColumnTypeAdapter(stringType)
)
}
}
}
}