com.zeoflow.depot.solver.shortcut.result.InsertMethodAdapter.kt Maven / Gradle / Ivy

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The Depot persistence library provides an abstraction layer over SQLite to allow for more robust database access while using the full power of SQLite.
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/*
 * Copyright (C) 2021 ZeoFlow SRL
 *
 * 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 com.zeoflow.depot.solver.shortcut.result

import com.zeoflow.depot.compiler.processing.XType
import com.zeoflow.depot.compiler.processing.isArray
import com.zeoflow.depot.compiler.processing.isKotlinUnit
import com.zeoflow.depot.compiler.processing.isLong
import com.zeoflow.depot.compiler.processing.isVoid
import com.zeoflow.depot.compiler.processing.isVoidObject
import com.zeoflow.depot.ext.KotlinTypeNames
import com.zeoflow.depot.ext.L
import com.zeoflow.depot.ext.N
import com.zeoflow.depot.ext.T
import com.zeoflow.depot.ext.typeName
import com.zeoflow.depot.solver.CodeGenScope
import com.zeoflow.depot.vo.ShortcutQueryParameter
import com.squareup.javapoet.ArrayTypeName
import com.squareup.javapoet.FieldSpec
import com.squareup.javapoet.ParameterizedTypeName
import com.squareup.javapoet.TypeName
import com.squareup.javapoet.TypeSpec

/**
 * Class that knows how to generate an insert method body.
 */
class InsertMethodAdapter private constructor(private val insertionType: InsertionType) {
    companion object {
        fun create(
            returnType: XType,
            params: List
        ): InsertMethodAdapter? {
            val insertionType = getInsertionType(returnType)
            if (insertionType != null && isInsertValid(insertionType, params)) {
                return InsertMethodAdapter(insertionType)
            }
            return null
        }

        private fun isInsertValid(
            insertionType: InsertionType?,
            params: List
        ): Boolean {
            if (insertionType == null) {
                return false
            }
            if (params.isEmpty() || params.size > 1) {
                return insertionType == InsertionType.INSERT_VOID ||
                    insertionType == InsertionType.INSERT_UNIT
            }
            return if (params.first().isMultiple) {
                insertionType in MULTIPLE_ITEM_SET
            } else {
                insertionType == InsertionType.INSERT_VOID ||
                    insertionType == InsertionType.INSERT_VOID_OBJECT ||
                    insertionType == InsertionType.INSERT_UNIT ||
                    insertionType == InsertionType.INSERT_SINGLE_ID
            }
        }

        private val MULTIPLE_ITEM_SET by lazy {
            setOf(
                InsertionType.INSERT_VOID,
                InsertionType.INSERT_VOID_OBJECT,
                InsertionType.INSERT_UNIT,
                InsertionType.INSERT_ID_ARRAY,
                InsertionType.INSERT_ID_ARRAY_BOX,
                InsertionType.INSERT_ID_LIST
            )
        }

        @Suppress("PLATFORM_CLASS_MAPPED_TO_KOTLIN")
        private fun getInsertionType(returnType: XType): InsertionType? {
            return if (returnType.isVoid()) {
                InsertionType.INSERT_VOID
            } else if (returnType.isVoidObject()) {
                InsertionType.INSERT_VOID_OBJECT
            } else if (returnType.isKotlinUnit()) {
                InsertionType.INSERT_UNIT
            } else if (returnType.isArray()) {
                val param = returnType.componentType
                if (param.isLong()) {
                    if (param.typeName == TypeName.LONG) {
                        InsertionType.INSERT_ID_ARRAY
                    } else {
                        InsertionType.INSERT_ID_ARRAY_BOX
                    }
                } else {
                    null
                }
            } else if (returnType.isList()) {
                val param = returnType.typeArguments.first()
                if (param.isLong()) {
                    InsertionType.INSERT_ID_LIST
                } else {
                    null
                }
            } else if (returnType.isLong()) {
                InsertionType.INSERT_SINGLE_ID
            } else {
                null
            }
        }
    }

    fun createInsertionMethodBody(
        parameters: List,
        insertionAdapters: Map>,
        dbField: FieldSpec,
        scope: CodeGenScope
    ) {
        scope.builder().apply {
            // TODO assert thread
            // TODO collect results
            addStatement("$N.beginTransaction()", dbField)
            val needsResultVar = insertionType != InsertionType.INSERT_VOID &&
                insertionType != InsertionType.INSERT_VOID_OBJECT &&
                insertionType != InsertionType.INSERT_UNIT
            val resultVar = if (needsResultVar) {
                scope.getTmpVar("_result")
            } else {
                null
            }

            beginControlFlow("try").apply {
                parameters.forEach { param ->
                    val insertionAdapter = insertionAdapters[param.name]?.first
                    if (needsResultVar) {
                        // if it has more than 1 parameter, we would've already printed the error
                        // so we don't care about re-declaring the variable here
                        addStatement(
                            "$T $L = $N.$L($L)",
                            insertionType.returnTypeName, resultVar,
                            insertionAdapter, insertionType.methodName,
                            param.name
                        )
                    } else {
                        addStatement(
                            "$N.$L($L)", insertionAdapter, insertionType.methodName,
                            param.name
                        )
                    }
                }
                addStatement("$N.setTransactionSuccessful()", dbField)
                if (needsResultVar) {
                    addStatement("return $L", resultVar)
                } else if (insertionType == InsertionType.INSERT_VOID_OBJECT) {
                    addStatement("return null")
                } else if (insertionType == InsertionType.INSERT_UNIT) {
                    addStatement("return $T.INSTANCE", KotlinTypeNames.UNIT)
                }
            }
            nextControlFlow("finally").apply {
                addStatement("$N.endTransaction()", dbField)
            }
            endControlFlow()
        }
    }

    enum class InsertionType(
        // methodName matches EntityInsertionAdapter methods
        val methodName: String,
        val returnTypeName: TypeName
    ) {
        INSERT_VOID("insert", TypeName.VOID), // return void
        INSERT_VOID_OBJECT("insert", TypeName.VOID), // return void
        INSERT_UNIT("insert", KotlinTypeNames.UNIT), // return kotlin.Unit.INSTANCE
        INSERT_SINGLE_ID("insertAndReturnId", TypeName.LONG), // return long
        INSERT_ID_ARRAY(
            "insertAndReturnIdsArray",
            ArrayTypeName.of(TypeName.LONG)
        ), // return long[]
        INSERT_ID_ARRAY_BOX(
            "insertAndReturnIdsArrayBox",
            ArrayTypeName.of(TypeName.LONG.box())
        ), // return Long[]
        INSERT_ID_LIST(
            "insertAndReturnIdsList", // return List
            ParameterizedTypeName.get(List::class.typeName, TypeName.LONG.box())
        ),
    }
}