19066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/* 29066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Copyright (C) 2007 The Android Open Source Project 39066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 49066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Licensed under the Apache License, Version 2.0 (the "License"); 59066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * you may not use this file except in compliance with the License. 69066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * You may obtain a copy of the License at 79066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 89066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * http://www.apache.org/licenses/LICENSE-2.0 99066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Unless required by applicable law or agreed to in writing, software 119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * distributed under the License is distributed on an "AS IS" BASIS, 129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * See the License for the specific language governing permissions and 149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * limitations under the License. 159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpackage com.android.internal.util; 189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project/** 209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * {@link CharSequence} utility methods. 219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Projectpublic class CharSequences { 239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Adapts {@link CharSequence} to an array of ASCII (7-bits per character) 269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bytes. 279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bytes ASCII bytes 299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static CharSequence forAsciiBytes(final byte[] bytes) { 319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new CharSequence() { 329066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public char charAt(int index) { 339066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (char) bytes[index]; 349066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 359066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 369066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int length() { 379066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return bytes.length; 389066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 399066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 409066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public CharSequence subSequence(int start, int end) { 419066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return forAsciiBytes(bytes, start, end); 429066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 439066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 449066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String toString() { 459066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new String(bytes); 469066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 479066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project }; 489066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 499066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 509066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 519066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Adapts {@link CharSequence} to an array of ASCII (7-bits per character) 529066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * bytes. 539066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 549066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param bytes ASCII bytes 559066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param start index, inclusive 569066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param end index, exclusive 579066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 589066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @throws IndexOutOfBoundsException if start or end are negative, if end 599066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * is greater than length(), or if start is greater than end 609066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 619066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static CharSequence forAsciiBytes(final byte[] bytes, 629066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project final int start, final int end) { 639066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project validate(start, end, bytes.length); 649066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new CharSequence() { 659066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public char charAt(int index) { 669066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return (char) bytes[index + start]; 679066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 689066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 699066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public int length() { 709066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return end - start; 719066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 729066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 739066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public CharSequence subSequence(int newStart, int newEnd) { 749066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newStart -= start; 759066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project newEnd -= start; 769066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project validate(newStart, newEnd, length()); 779066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return forAsciiBytes(bytes, newStart, newEnd); 789066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 799066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 809066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public String toString() { 819066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return new String(bytes, start, length()); 829066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 839066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project }; 849066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 859066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 869066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project static void validate(int start, int end, int length) { 879066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (start < 0) throw new IndexOutOfBoundsException(); 889066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (end < 0) throw new IndexOutOfBoundsException(); 899066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (end > length) throw new IndexOutOfBoundsException(); 909066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (start > end) throw new IndexOutOfBoundsException(); 919066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 929066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 939066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 949066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compares two character sequences for equality. 959066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 969066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static boolean equals(CharSequence a, CharSequence b) { 979066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (a.length() != b.length()) { 989066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 999066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1009066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1019066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int length = a.length(); 1029066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project for (int i = 0; i < length; i++) { 1039066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if (a.charAt(i) != b.charAt(i)) { 1049066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return false; 1059066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1069066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1079066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return true; 1089066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1099066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1109066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project /** 1119066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * Compares two character sequences with API like {@link Comparable#compareTo}. 1129066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * 1139066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param me The CharSequence that receives the compareTo call. 1149066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @param another The other CharSequence. 1159066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project * @return See {@link Comparable#compareTo}. 1169066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project */ 1179066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project public static int compareToIgnoreCase(CharSequence me, CharSequence another) { 1189066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project // Code adapted from String#compareTo 1199066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int myLen = me.length(), anotherLen = another.length(); 1209066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int myPos = 0, anotherPos = 0, result; 1219066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project int end = (myLen < anotherLen) ? myLen : anotherLen; 1229066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project 1239066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project while (myPos < end) { 1249066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project if ((result = Character.toLowerCase(me.charAt(myPos++)) 1259066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project - Character.toLowerCase(another.charAt(anotherPos++))) != 0) { 1269066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return result; 1279066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1289066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1299066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project return myLen - anotherLen; 1309066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project } 1319066cfe9886ac131c34d59ed0e2d287b0e3c0087The Android Open Source Project} 132