com.zeoflow.depot.writer.PreparedStatementWriter.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.writer

import com.zeoflow.depot.ext.L
import com.zeoflow.depot.ext.N
import com.zeoflow.depot.ext.DepotTypeNames
import com.zeoflow.depot.solver.CodeGenScope
import com.squareup.javapoet.ClassName
import com.squareup.javapoet.FieldSpec
import com.squareup.javapoet.MethodSpec
import com.squareup.javapoet.TypeSpec
import javax.lang.model.element.Modifier

/**
 * Creates anonymous classes for DepotTypeNames#SHARED_SQLITE_STMT.
 */
class PreparedStatementWriter(val queryWriter: QueryWriter) {
    fun createAnonymous(classWriter: ClassWriter, dbParam: FieldSpec): TypeSpec {
        val scope = CodeGenScope(classWriter)
        @Suppress("RemoveSingleExpressionStringTemplate")
        return TypeSpec.anonymousClassBuilder("$N", dbParam).apply {
            superclass(DepotTypeNames.SHARED_SQLITE_STMT)
            addMethod(
                MethodSpec.methodBuilder("createQuery").apply {
                    addAnnotation(Override::class.java)
                    returns(ClassName.get("java.lang", "String"))
                    addModifiers(Modifier.PUBLIC)
                    val queryName = scope.getTmpVar("_query")
                    val queryGenScope = scope.fork()
                    queryWriter.prepareQuery(queryName, queryGenScope)
                    addCode(queryGenScope.builder().build())
                    addStatement("return $L", queryName)
                }.build()
            )
        }.build()
    }
}