/*
* Copyright 2021 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.processing.XType
import androidx.room.ext.CollectionTypeNames.ARRAY_MAP
import androidx.room.ext.L
import androidx.room.ext.T
import androidx.room.solver.CodeGenScope
import com.squareup.javapoet.ClassName
import com.squareup.javapoet.ParameterizedTypeName
class MapQueryResultAdapter(
override val keyTypeArg: XType,
override val valueTypeArg: XType,
private val keyRowAdapter: RowAdapter,
private val valueRowAdapter: RowAdapter,
private val valueCollectionType: XType?,
isArrayMap: Boolean = false,
private val isSparseArray: ClassName? = null
) : QueryResultAdapter(listOf(keyRowAdapter, valueRowAdapter)), MultimapQueryResultAdapter {
private val declaredToConcreteCollection = mapOf<ClassName, ClassName>(
ClassName.get(List::class.java) to ClassName.get(ArrayList::class.java),
ClassName.get(Set::class.java) to ClassName.get(HashSet::class.java)
)
private val declaredValueType = if (valueCollectionType != null) {
ParameterizedTypeName.get(
valueCollectionType.typeElement?.className,
valueTypeArg.typeName
)
} else {
valueTypeArg.typeName
}
private val concreteValueType = if (valueCollectionType != null) {
ParameterizedTypeName.get(
declaredToConcreteCollection[valueCollectionType.typeElement?.className],
valueTypeArg.typeName
)
} else {
valueTypeArg.typeName
}
private val mapType = if (isSparseArray != null) {
ParameterizedTypeName.get(
isSparseArray,
declaredValueType
)
} else {
ParameterizedTypeName.get(
if (isArrayMap) ARRAY_MAP else ClassName.get(Map::class.java),
keyTypeArg.typeName,
declaredValueType
)
}
// LinkedHashMap is used as impl to preserve key ordering for ordered query results.
private val mapImplType =
if (isSparseArray != null) {
ParameterizedTypeName.get(
isSparseArray,
declaredValueType
)
} else {
ParameterizedTypeName.get(
if (isArrayMap) ARRAY_MAP else ClassName.get(LinkedHashMap::class.java),
keyTypeArg.typeName,
declaredValueType
)
}
override fun convert(outVarName: String, cursorVarName: String, scope: CodeGenScope) {
scope.builder().apply {
keyRowAdapter.onCursorReady(cursorVarName, scope)
valueRowAdapter.onCursorReady(cursorVarName, scope)
addStatement("final $T $L = new $T()", mapType, outVarName, mapImplType)
val tmpKeyVarName = scope.getTmpVar("_key")
val tmpValueVarName = scope.getTmpVar("_value")
beginControlFlow("while ($L.moveToNext())", cursorVarName).apply {
addStatement("final $T $L", keyTypeArg.typeName, tmpKeyVarName)
keyRowAdapter.convert(tmpKeyVarName, cursorVarName, scope)
val columnNullCheckVarName = getColumnNullCheck(
cursorVarName = cursorVarName,
valueRowAdapter = valueRowAdapter
)
// If valueCollectionType is null, this means that we have a 1-to-1 mapping, as
// opposed to a 1-to-many mapping.
if (valueCollectionType != null) {
val tmpCollectionVarName = scope.getTmpVar("_values")
addStatement("$T $L", declaredValueType, tmpCollectionVarName)
if (isSparseArray != null) {
beginControlFlow("if ($L.get($L) != null)", outVarName, tmpKeyVarName)
} else {
beginControlFlow("if ($L.containsKey($L))", outVarName, tmpKeyVarName)
}.apply {
addStatement(
"$L = $L.get($L)",
tmpCollectionVarName,
outVarName,
tmpKeyVarName
)
}
nextControlFlow("else").apply {
addStatement("$L = new $T()", tmpCollectionVarName, concreteValueType)
addStatement(
"$L.put($L, $L)",
outVarName,
tmpKeyVarName,
tmpCollectionVarName
)
}
endControlFlow()
// Perform column null check
beginControlFlow("if ($L)", columnNullCheckVarName).apply {
addStatement("continue")
}.endControlFlow()
addStatement("final $T $L", valueTypeArg.typeName, tmpValueVarName)
valueRowAdapter.convert(tmpValueVarName, cursorVarName, scope)
addStatement("$L.add($L)", tmpCollectionVarName, tmpValueVarName)
} else {
// Perform column null check
beginControlFlow("if ($L)", columnNullCheckVarName).apply {
addStatement("$L.put($L, null)", outVarName, tmpKeyVarName)
addStatement("continue")
}.endControlFlow()
addStatement(
"final $T $L",
valueTypeArg.typeElement?.className,
tmpValueVarName
)
valueRowAdapter.convert(tmpValueVarName, cursorVarName, scope)
// For consistency purposes, in the one-to-one object mapping case, if
// multiple values are encountered for the same key, we will only consider
// the first ever encountered mapping.
if (isSparseArray != null) {
beginControlFlow("if ($L.get($L) == null)", outVarName, tmpKeyVarName)
} else {
beginControlFlow("if (!$L.containsKey($L))", outVarName, tmpKeyVarName)
}.apply {
addStatement("$L.put($L, $L)", outVarName, tmpKeyVarName, tmpValueVarName)
}
endControlFlow()
}
}
endControlFlow()
keyRowAdapter.onCursorFinished()?.invoke(scope)
valueRowAdapter.onCursorFinished()?.invoke(scope)
}
}
}