1/*
2 * Copyright (C) 2017 The Android Open Source Project
3 *
4 * Licensed under the Apache License, Version 2.0 (the "License");
5 * you may not use this file except in compliance with the License.
6 * You may obtain a copy of the License at
7 *
8 *      http://www.apache.org/licenses/LICENSE-2.0
9 *
10 * Unless required by applicable law or agreed to in writing, software
11 * distributed under the License is distributed on an "AS IS" BASIS,
12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13 * See the License for the specific language governing permissions and
14 * limitations under the License.
15 */
16
17import androidx.room.parser.SQLTypeAffinity
18import androidx.room.verifier.ColumnInfo
19import java.sql.PreparedStatement
20import java.sql.ResultSet
21import java.sql.ResultSetMetaData
22import java.sql.SQLException
23
24internal fun <T> ResultSet.collect(f: (ResultSet) -> T): List<T> {
25    val result = arrayListOf<T>()
26    try {
27        while (next()) {
28            result.add(f.invoke(this))
29        }
30    } finally {
31        close()
32    }
33    return result
34}
35
36private fun <T> PreparedStatement.map(f: (Int, ResultSetMetaData) -> T): List<T> {
37    val columnCount = try {
38        metaData.columnCount
39    } catch (ex: SQLException) {
40        // ignore, no-result query
41        0
42    }
43    // return is separate than data creation because we want to know who throws the exception
44    return (1.rangeTo(columnCount)).map { f(it, metaData) }
45}
46
47internal fun PreparedStatement.columnNames(): List<String> {
48    return map { index, data -> data.getColumnName(index) }
49}
50
51private fun PreparedStatement.tryGetAffinity(columnIndex: Int): SQLTypeAffinity {
52    return try {
53        SQLTypeAffinity.valueOf(metaData.getColumnTypeName(columnIndex).capitalize())
54    } catch (ex: IllegalArgumentException) {
55        SQLTypeAffinity.NULL
56    }
57}
58
59internal fun PreparedStatement.columnInfo(): List<ColumnInfo> {
60    //see: http://sqlite.1065341.n5.nabble.com/Column-order-in-resultset-td23127.html
61    return map { index, data -> ColumnInfo(data.getColumnName(index), tryGetAffinity(index)) }
62}
63