11d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/* 21d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Licensed to the Apache Software Foundation (ASF) under one or more 31d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * contributor license agreements. See the NOTICE file distributed with 41d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * this work for additional information regarding copyright ownership. 51d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * The ASF licenses this file to You under the Apache License, Version 2.0 61d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * (the "License"); you may not use this file except in compliance with 71d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * the License. You may obtain a copy of the License at 81d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 91d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * http://www.apache.org/licenses/LICENSE-2.0 101d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * 111d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Unless required by applicable law or agreed to in writing, software 121d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * distributed under the License is distributed on an "AS IS" BASIS, 131d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 141d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * See the License for the specific language governing permissions and 151d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * limitations under the License. 161d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 171d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 181d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertpackage com.google.common.primitives; 191d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 201d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkArgument; 211d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport static com.google.common.base.Preconditions.checkNotNull; 221d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 231d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertimport javax.annotation.CheckForNull; 241d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 251d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert/** 261d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * Static utility methods derived from Android's {@code Integer.java}. 271d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 281d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringertfinal class AndroidInteger { 291d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 301d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * See {@link Ints#tryParse(String)} for the public interface. 311d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 321d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @CheckForNull 331d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert static Integer tryParse(String string) { 341d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return tryParse(string, 10); 351d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 361d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 371d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert /** 381d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert * See {@link Ints#tryParse(String, int)} for the public interface. 391d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert */ 401d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @CheckForNull 411d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert static Integer tryParse(String string, int radix) { 421d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkNotNull(string); 431d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkArgument(radix >= Character.MIN_RADIX, 441d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert "Invalid radix %s, min radix is %s", radix, Character.MIN_RADIX); 451d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert checkArgument(radix <= Character.MAX_RADIX, 461d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert "Invalid radix %s, max radix is %s", radix, Character.MAX_RADIX); 471d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int length = string.length(), i = 0; 481d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (length == 0) { 491d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 501d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 511d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert boolean negative = string.charAt(i) == '-'; 521d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (negative && ++i == length) { 531d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 541d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 551d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return tryParse(string, i, radix, negative); 561d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 571d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 581d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert @CheckForNull 591d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private static Integer tryParse(String string, int offset, int radix, 601d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert boolean negative) { 611d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int max = Integer.MIN_VALUE / radix; 621d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int result = 0, length = string.length(); 631d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert while (offset < length) { 641d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int digit = Character.digit(string.charAt(offset++), radix); 651d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (digit == -1) { 661d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 671d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 681d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (max > result) { 691d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 701d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 711d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert int next = result * radix - digit; 721d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (next > result) { 731d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 741d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 751d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert result = next; 761d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 771d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (!negative) { 781d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert result = -result; 791d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (result < 0) { 801d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 811d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 821d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 831d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert // For GWT where ints do not overflow 841d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert if (result > Integer.MAX_VALUE || result < Integer.MIN_VALUE) { 851d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return null; 861d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 871d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert return result; 881d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert } 891d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert 901d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert private AndroidInteger() {} 911d580d0f6ee4f21eb309ba7b509d2c6d671c4044Bjorn Bringert} 92