From 5a4df267f353ce7dd6ff067b4d7a029315dcdc51 Mon Sep 17 00:00:00 2001
From: Aleksey Kalenchukov <aleksey.kalenchukov@yandex.ru>
Date: Fri, 5 Aug 2022 09:42:20 +0300
Subject: [PATCH] =?UTF-8?q?=D0=98=D0=B7=D0=BC=D0=B5=D0=BD=D1=91=D0=BD=20?=
 =?UTF-8?q?=D0=BC=D0=B5=D1=82=D0=BE=D0=B4=20getLetters()?=
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---
 .../alphabet/AbstractAlphabet.java            | 43 +++++--------------
 1 file changed, 10 insertions(+), 33 deletions(-)

diff --git a/src/main/java/dev/kalenchukov/alphabet/AbstractAlphabet.java b/src/main/java/dev/kalenchukov/alphabet/AbstractAlphabet.java
index 33ce466..3500c25 100644
--- a/src/main/java/dev/kalenchukov/alphabet/AbstractAlphabet.java
+++ b/src/main/java/dev/kalenchukov/alphabet/AbstractAlphabet.java
@@ -55,7 +55,15 @@ protected AbstractAlphabet(@NotNull final List<@NotNull Character> letters)
 		Objects.requireNonNull(from);
 		Objects.requireNonNull(to);
 
-		return this.getLetters(this.letters, from, to);
+		if (from > to) {
+			throw new IllegalArgumentException();
+		}
+
+		if (from < 1 || to > this.letters.size()) {
+			throw new IndexOutOfBoundsException();
+		}
+
+		return Collections.unmodifiableList(this.letters.subList(from - 1, to));
 	}
 
 	/**
@@ -69,7 +77,7 @@ public Character getLetter(@NotNull final Integer position)
 
 		try
 		{
-			return this.getLetters(this.letters, position, position).get(0);
+			return this.getLetters(position, position).get(0);
 		}
 		catch (IllegalArgumentException | IndexOutOfBoundsException exception)
 		{
@@ -77,37 +85,6 @@ public Character getLetter(@NotNull final Integer position)
 		}
 	}
 
-	/**
-	 * Возвращает срез букв алфавита.
-	 *
-	 * @param alphabet Алфавит.
-	 * @param from Начальная позиция букв в алфавите.
-	 * @param to Конечная позиция букв в алфавите.
-	 * @return Коллекция из среза букв алфавита.
-	 * @throws IllegalArgumentException Если начальная позиция {@code from} больше {@code to}.
-	 * @throws IndexOutOfBoundsException Если позиция {@code from} или {@code to} выходят за пределы алфавита.
-	 */
-	@Unmodifiable
-	@NotNull
-	protected List<@NotNull Character> getLetters(@NotNull final List<@NotNull Character> alphabet,
-												  @NotNull final Integer from,
-												  @NotNull final Integer to)
-	{
-		Objects.requireNonNull(alphabet);
-		Objects.requireNonNull(from);
-		Objects.requireNonNull(to);
-
-		if (from > to) {
-			throw new IllegalArgumentException();
-		}
-
-		if (from < 1 || to > alphabet.size()) {
-			throw new IndexOutOfBoundsException();
-		}
-
-		return Collections.unmodifiableList(alphabet.subList(from - 1, to));
-	}
-
 	/**
 	 * @see Alphabetical#hasLetter(Character)
 	 */