mirror of https://github.com/M66B/FairEmail.git
86 lines
2.4 KiB
Kotlin
86 lines
2.4 KiB
Kotlin
/*
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* Copyright (C) 2016 The Android Open Source Project
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*
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* Licensed under the Apache License, Version 2.0 (the "License");
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* you may not use this file except in compliance with the License.
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* You may obtain a copy of the License at
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*
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* http://www.apache.org/licenses/LICENSE-2.0
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*
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* Unless required by applicable law or agreed to in writing, software
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* distributed under the License is distributed on an "AS IS" BASIS,
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* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
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* See the License for the specific language governing permissions and
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* limitations under the License.
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*/
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@file:JvmName("StringUtil")
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@file:RestrictTo(RestrictTo.Scope.LIBRARY_GROUP_PREFIX)
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package androidx.room.util
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import android.util.Log
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import androidx.annotation.RestrictTo
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import java.lang.NumberFormatException
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import java.lang.StringBuilder
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@Suppress("unused")
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@JvmField
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val EMPTY_STRING_ARRAY = arrayOfNulls<String>(0)
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/**
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* Returns a new StringBuilder to be used while producing SQL queries.
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*
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* @return A new or recycled StringBuilder
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*/
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fun newStringBuilder(): StringBuilder {
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// TODO pool:
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return StringBuilder()
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}
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/**
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* Adds bind variable placeholders (?) to the given string. Each placeholder is separated
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* by a comma.
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*
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* @param builder The StringBuilder for the query
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* @param count Number of placeholders
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*/
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fun appendPlaceholders(builder: StringBuilder, count: Int) {
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for (i in 0 until count) {
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builder.append("?")
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if (i < count - 1) {
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builder.append(",")
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}
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}
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}
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/**
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* Splits a comma separated list of integers to integer list.
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*
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*
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* If an input is malformed, it is omitted from the result.
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*
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* @param input Comma separated list of integers.
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* @return A List containing the integers or null if the input is null.
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*/
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fun splitToIntList(input: String?): List<Int>? {
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return input?.split(',')?.mapNotNull { item ->
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try {
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item.toInt()
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} catch (ex: NumberFormatException) {
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Log.e("ROOM", "Malformed integer list", ex)
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null
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}
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}
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}
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/**
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* Joins the given list of integers into a comma separated list.
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*
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* @param input The list of integers.
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* @return Comma separated string composed of integers in the list. If the list is null, return
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* value is null.
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*/
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fun joinIntoString(input: List<Int>?): String? {
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return input?.joinToString(",")
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}
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