LineReaderAppDelegate.m

//
//  LineReaderAppDelegate.m
//  LineReader
//
//  Created by Tobias Preuss on 05.10.10.
//  Copyright 2010 Tobias Preuss. All rights reserved.
//

#import "LineReaderAppDelegate.h"
#import "DirectoryReader.h"
#import "FileReader.h"


/**
	An application delegate.
 */
@implementation LineReaderAppDelegate


/**
	Initializes an application delegate object.
	@returns An initialized LineReaderAppDelegate object or nil if the object could not be created.
 */
- (id)init {

	self = [super init];
	if (self != nil) {
		m_sourcePath = [NSString stringWithFormat:@"/tmp/"];
		m_maxNumLines = [NSNumber numberWithInt:3];
		m_selectedReadMode = [NSNumber numberWithInt:BACKWARDS];
		m_printLines = [NSNumber numberWithBool:NO];
		m_status = [NSString stringWithFormat:@"Application started."];		
		m_directoryListing = nil;
	}
	return self;
}


// -----------------------------------------------------------------------------
// Properties.
// -----------------------------------------------------------------------------


@synthesize window = m_window;
@synthesize maxNumLines = m_maxNumLines;
@synthesize sourcePath = m_sourcePath;
@synthesize selectedReadMode = m_selectedReadMode;
@synthesize printLines = m_printLines;
@synthesize status = m_status;




// -----------------------------------------------------------------------------
// Event functions.
// -----------------------------------------------------------------------------


/**
	Sent by the default notification center after the application 
	has been launched and initialized but before it has received 
	its first event.
	@param aNotification A notification named NSApplicationDidFinishLaunchingNotification.
 */
- (void)applicationDidFinishLaunching:(NSNotification*)aNotification {
}


/**
	The function is called whenever lines should be read.
	@param sender The object calling this method.
 */
- (IBAction)readLinesRequested:(id)sender {
	
	[self processSource];
}



// -----------------------------------------------------------------------------
// Private functions.
// -----------------------------------------------------------------------------



/**
	Reads a various number of lines from multiple files as 
	found in the source path. The lines can be read forwards 
	or backwards from the file.
 */
- (void)processSource {

	int lineCount;
	NSTimeInterval processingStarted = [NSDate timeIntervalSinceReferenceDate];
	
	DirectoryReader* directoryReader = [[DirectoryReader alloc] initWithPath:m_sourcePath];
	if (!directoryReader) {
		return;
	}
	
	if ([directoryReader readDirectory:&m_directoryListing]) {
		
		for (NSString* path in m_directoryListing) {
			NSLog(@"File: %@", path); /* DEBUG LOG */
			lineCount = 0;
			FileReader* fileReader = [[FileReader alloc] initWithFilePath:path];
			if (!fileReader) {
				return;
			}
			
			NSString* line = nil;
			
			
			if ([m_printLines boolValue]) {
				// Print lines to console.
				switch ([m_selectedReadMode intValue]) {
					case FORWARDS:
						while ((line = [fileReader readLine])) {
							lineCount++;
							NSLog(@"%3.d: %@", lineCount, line);
							if (lineCount >= [m_maxNumLines intValue]) {
								break;
							}
						}				
						break;
					case BACKWARDS:
						while ((line = [fileReader readLineBackwards])) {
							lineCount++;
							NSLog(@"%3.d: %@", lineCount, line);
							if (lineCount >= [m_maxNumLines intValue]) {
								break;
							}
						}					
						break;
					default:
						NSLog(@"Warning: Read mode not set correctly."); /* DEBUG LOG */
						break;
				}				
			}
			else {
				// Do not print lines to console.				
				switch ([m_selectedReadMode intValue]) {
					case FORWARDS:
						while ((line = [fileReader readLine])) {
							lineCount++;
							if (lineCount >= [m_maxNumLines intValue]) {
								break;
							}
						}				
						break;
					case BACKWARDS:
						while ((line = [fileReader readLineBackwards])) {
							lineCount++;
							if (lineCount >= [m_maxNumLines intValue]) {
								break;
							}
						}					
						break;
					default:
						NSLog(@"Warning: Read mode not set correctly."); /* DEBUG LOG */
						break;
				}				
				
			}

		}		
	}
	
	NSTimeInterval processingEnded = [NSDate timeIntervalSinceReferenceDate];
	
	if ([m_selectedReadMode intValue] == FORWARDS)
		self.status = [NSString stringWithFormat:@"Processing %d lines forwards took %f seconds.", lineCount, (processingEnded - processingStarted)];
	else
		self.status = [NSString stringWithFormat:@"Processing %d lines backwards took %f seconds.", lineCount, (processingEnded - processingStarted)];
					
}

@end