com.zeoflow.depot.solver.query.result.SingleEntityQueryResultAdapter.kt Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of depot-compiler Show documentation

The Depot persistence library provides an abstraction layer over SQLite to allow for more robust database access while using the full power of SQLite.

The newest version!

/*
 * 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.query.result

import com.zeoflow.depot.ext.L
import com.zeoflow.depot.ext.T
import com.zeoflow.depot.solver.CodeGenScope

/**
 * Wraps a row adapter when there is only 1 item in the result
 */
class SingleEntityQueryResultAdapter(rowAdapter: RowAdapter) : QueryResultAdapter(rowAdapter) {
    val type = rowAdapter.out
    override fun convert(outVarName: String, cursorVarName: String, scope: CodeGenScope) {
        scope.builder().apply {
            rowAdapter?.onCursorReady(cursorVarName, scope)
            addStatement("final $T $L", type.typeName, outVarName)
            beginControlFlow("if($L.moveToFirst())", cursorVarName)
            rowAdapter?.convert(outVarName, cursorVarName, scope)
            nextControlFlow("else").apply {
                addStatement("$L = $L", outVarName, rowAdapter?.out?.defaultValue())
            }
            endControlFlow()
            rowAdapter?.onCursorFinished()?.invoke(scope)
        }
    }
}