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* Allow any String IDs as long as they're sortable * Allow any String IDs as long as they're sortablepull/1027/head
Ivan Kupalov
7 years ago
committed by
Konrad Pozniak
12 changed files with 148 additions and 73 deletions
@ -1,17 +0,0 @@
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package com.keylesspalace.tusky.util; |
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import java.util.Random; |
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public class StringUtils { |
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public static String randomAlphanumericString(int count) { |
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char[] chars = new char[count]; |
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Random random = new Random(); |
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final String POSSIBLE_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ"; |
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for (int i = 0; i < count; i++) { |
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chars[i] = POSSIBLE_CHARS.charAt(random.nextInt(POSSIBLE_CHARS.length())); |
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} |
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return new String(chars); |
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} |
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} |
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@ -0,0 +1,72 @@
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@file:JvmName("StringUtils") |
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package com.keylesspalace.tusky.util |
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import java.util.Random |
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private const val POSSIBLE_CHARS = "0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ" |
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fun randomAlphanumericString(count: Int): String { |
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val chars = CharArray(count) |
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val random = Random() |
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for (i in 0 until count) { |
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chars[i] = POSSIBLE_CHARS[random.nextInt(POSSIBLE_CHARS.length)] |
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} |
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return String(chars) |
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} |
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// We sort statuses by ID. Something we need to invent some ID for placeholder. |
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// Not sure if inc()/dec() should be made `operator` or not |
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/** |
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* "Increment" string so that during sorting it's bigger than [this]. |
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*/ |
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fun String.inc(): String { |
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// We assume that we will stay in the safe range for now |
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val builder = this.toCharArray() |
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builder.last().inc() |
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return String(builder) |
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} |
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/** |
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* "Decrement" string so that during sorting it's smaller than [this]. |
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*/ |
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fun String.dec(): String { |
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val builder = this.toCharArray() |
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var i = builder.lastIndex |
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while (i > 0) { |
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if (builder[i] > '0') { |
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builder[i] = builder[i].dec() |
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break |
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} else { |
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builder[i] = 'z' |
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} |
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i-- |
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} |
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// All characters were '0' |
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if (i == 0 && this.isNotEmpty()) { |
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// Remove one character |
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return String(builder.copyOfRange(1, builder.size)) |
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} |
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return String(builder) |
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} |
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/** |
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* A < B (strictly) by length and then by content. |
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* Examples: |
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* "abc" < "bcd" |
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* "ab" < "abc" |
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* "cb" < "abc" |
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* not: "ab" < "ab" |
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* not: "abc" > "cb" |
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*/ |
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fun String.isLessThan(other: String): Boolean { |
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return when { |
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this.length < other.length -> true |
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this.length > other.length -> false |
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else -> this < other |
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} |
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} |
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@ -0,0 +1,34 @@
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package com.keylesspalace.tusky |
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import com.keylesspalace.tusky.util.dec |
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import com.keylesspalace.tusky.util.isLessThan |
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import org.junit.Assert.* |
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import org.junit.Test |
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class StringUtilsTest { |
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@Test |
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fun isLessThan() { |
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val lessList = listOf( |
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"abc" to "bcd", |
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"ab" to "abc", |
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"cb" to "abc" |
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) |
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lessList.forEach { (l, r) -> assertTrue("$l < $r", l.isLessThan(r)) } |
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val notLessList = lessList.map { (l, r) -> r to l } + listOf( |
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"abc" to "abc" |
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) |
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notLessList.forEach { (l, r) -> assertFalse("not $l < $r", l.isLessThan(r)) } |
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} |
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@Test |
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fun dec() { |
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listOf( |
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"123" to "122", |
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"12B" to "12A", |
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"120" to "11z", |
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"100" to "zz", |
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"0" to "", |
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"" to "" |
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).forEach { (l, r) -> assertEquals("$l - 1 = $r", r, l.dec()) } |
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} |
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} |
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