ImmutableListQueryResultAdapter.kt
/*
* Copyright 2020 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.XCodeBlock
import androidx.room.compiler.codegen.XCodeBlock.Builder.Companion.addLocalVal
import androidx.room.compiler.processing.XType
import androidx.room.ext.GuavaTypeNames
import androidx.room.solver.CodeGenScope
class ImmutableListQueryResultAdapter(
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 collectionType = GuavaTypeNames.IMMUTABLE_LIST.parametrizedBy(
typeArg.asTypeName()
)
val immutableListBuilderType = GuavaTypeNames
.IMMUTABLE_LIST_BUILDER.parametrizedBy(typeArg.asTypeName())
val immutableListBuilderName = scope.getTmpVar("_immutableListBuilder")
addLocalVariable(
name = immutableListBuilderName,
typeName = immutableListBuilderType,
assignExpr = XCodeBlock.of(
language = language,
"%T.builder()",
GuavaTypeNames.IMMUTABLE_LIST
)
)
val tmpVarName = scope.getTmpVar("_item")
beginControlFlow("while (%L.moveToNext())", cursorVarName).apply {
addLocalVariable(
name = tmpVarName,
typeName = typeArg.asTypeName()
)
rowAdapter.convert(tmpVarName, cursorVarName, scope)
addStatement(
"%L.add(%L)",
immutableListBuilderName,
tmpVarName
)
}
endControlFlow()
addLocalVal(
name = outVarName,
typeName = collectionType,
assignExprFormat = "%L.build()",
immutableListBuilderName
)
}
}
}