| /* |
| * 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 |
| ) : 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 = 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 = 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) |
| |
| val mapVarName = outVarName |
| addStatement("final $T $L = new $T()", mapType, mapVarName, mapImplType) |
| |
| val tmpKeyVarName = scope.getTmpVar("_key") |
| val tmpValueVarName = scope.getTmpVar("_value") |
| beginControlFlow("while ($L.moveToNext())", cursorVarName).apply { |
| addStatement("final $T $L", keyTypeArg.typeName, tmpKeyVarName) |
| keyRowAdapter.convert(tmpKeyVarName, cursorVarName, scope) |
| |
| // 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) { |
| addStatement("final $T $L", valueTypeArg.typeName, tmpValueVarName) |
| valueRowAdapter.convert(tmpValueVarName, cursorVarName, scope) |
| val tmpCollectionVarName = scope.getTmpVar("_values") |
| addStatement("$T $L", declaredValueType, tmpCollectionVarName) |
| beginControlFlow("if ($L.containsKey($L))", mapVarName, tmpKeyVarName).apply { |
| addStatement( |
| "$L = $L.get($L)", |
| tmpCollectionVarName, |
| mapVarName, |
| tmpKeyVarName |
| ) |
| } |
| nextControlFlow("else").apply { |
| addStatement("$L = new $T()", tmpCollectionVarName, concreteValueType) |
| addStatement( |
| "$L.put($L, $L)", |
| mapVarName, |
| tmpKeyVarName, |
| tmpCollectionVarName |
| ) |
| } |
| endControlFlow() |
| addStatement("$L.add($L)", tmpCollectionVarName, tmpValueVarName) |
| } else { |
| addStatement( |
| "final $T $L", |
| valueTypeArg.typeElement?.className, |
| tmpValueVarName |
| ) |
| valueRowAdapter.convert(tmpValueVarName, cursorVarName, scope) |
| |
| // For consistency purposes, in the one-to-one object mapping case, if |
| // multiple values are encountered for the same key, we will only consider |
| // the first ever encountered mapping. |
| beginControlFlow("if (!$L.containsKey($L))", mapVarName, tmpKeyVarName).apply { |
| addStatement("$L.put($L, $L)", mapVarName, tmpKeyVarName, tmpValueVarName) |
| } |
| endControlFlow() |
| } |
| } |
| endControlFlow() |
| keyRowAdapter.onCursorFinished()?.invoke(scope) |
| valueRowAdapter.onCursorFinished()?.invoke(scope) |
| } |
| } |
| } |