1/* 2 * Copyright (C) 2016 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 17#import "WALTLogger.h" 18 19@implementation WALTLogger { 20 NSMutableString *_buffer; 21} 22 23+ (instancetype)sessionLogger { 24 static WALTLogger *sessionLogger = nil; 25 static dispatch_once_t token; 26 dispatch_once(&token, ^{ 27 sessionLogger = [[self alloc] init]; 28 }); 29 return sessionLogger; 30} 31 32- (instancetype)init { 33 if ((self = [super init])) { 34 _buffer = [[NSMutableString alloc] init]; 35 } 36 return self; 37} 38 39- (void)appendString:(NSString *)string { 40 @synchronized (_buffer) { 41 [_buffer appendString:string]; 42 } 43} 44 45- (void)appendFormat:(NSString *)format, ... { 46 va_list args; 47 va_start(args, format); 48 NSString *formatted = [[NSString alloc] initWithFormat:format arguments:args]; 49 [_buffer appendString:formatted]; 50 va_end(args); 51} 52 53- (void)clear { 54 @synchronized (_buffer) { 55 [_buffer setString:[NSString string]]; 56 } 57} 58 59- (BOOL)writeToURL:(NSURL *)url error:(NSError **)error { 60 @synchronized (_buffer) { 61 return [_buffer writeToURL:url 62 atomically:YES 63 encoding:NSUTF8StringEncoding 64 error:error]; 65 } 66} 67 68- (NSString *)stringValue { 69 @synchronized (_buffer) { 70 return [NSString stringWithString:_buffer]; 71 } 72} 73@end 74