October 12, 2013

How to Read and Write Data to Property List File(plist) in iOS?

I have written a class called AppHelper which has class level (static) methods. Those methods are very useful to use within UIViewController.

AppHelper.h

//
//  AppHelper.h
//

#import <foundation /Foundation.h>

@interface AppHelper : NSObject {
	
}

+(NSString *)getDocsDirectory;
+(BOOL)setPlist:(NSString *)strPlistName;
+(void)setPlistData:(NSString *)strPlistName key:(NSString *)key strValue:(NSString *)strValue;
+(id)getPlistData:(NSString *)strPlistName key:(NSString *)key;

@end

// AppHelper.h

#import <foundation /Foundation.h>

@interface AppHelper : NSObject {

}

+(NSString *)getDocsDirectory;

+(BOOL)setPlist:(NSString *)strPlistName;

+(void)setPlistData:(NSString *)strPlistName key:(NSString *)key strValue:(NSString *)strValue;

+(id)getPlistData:(NSString *)strPlistName key:(NSString *)key;

@end

AppHelper.m

//
//  AppHelper.m
//

#import "AppHelper.h"

@implementation AppHelper

+(NSString *)getDocsDirectory {
	NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);
	NSString *documentsDirectory = [paths objectAtIndex:0];
	
	return documentsDirectory;
}

+(BOOL)setPlist:(NSString *)strPlistName {
	NSError *error;
	NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];
	
	NSFileManager *fileManager = [NSFileManager defaultManager];
	
	if (![fileManager fileExistsAtPath:path]) {
		NSString *bundle = [[NSBundle mainBundle] pathForResource:strPlistName ofType:@"plist"];
		[fileManager copyItemAtPath:bundle toPath:path error:&error];
		return YES;
	}
	else {
		return NO;
	}
}

+(void)setPlistData:(NSString *)strPlistName key:(NSString *)key strValue:(NSString *)strValue {
	[self setPlist:strPlistName];
	
	NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];
	NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];
	
	[data setObject:strValue forKey:key];
	//[data setObject:[NSNumber numberWithInt:strValue] forKey:key];

	[data writeToFile:path atomically:YES];
}

+(id)getPlistData:(NSString *)strPlistName key:(NSString *)key {
	[self setPlist:strPlistName];
	
	NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];
	NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];
	return [data objectForKey:key];
}

// AppHelper.m

#import "AppHelper.h"

@implementation AppHelper

+(NSString *)getDocsDirectory {

NSArray *paths = NSSearchPathForDirectoriesInDomains(NSDocumentDirectory, NSUserDomainMask, YES);

NSString *documentsDirectory = [paths objectAtIndex:0];

return documentsDirectory;

}

+(BOOL)setPlist:(NSString *)strPlistName {

NSError *error;

NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];

NSFileManager *fileManager = [NSFileManager defaultManager];

if (![fileManager fileExistsAtPath:path]) {

NSString *bundle = [[NSBundle mainBundle] pathForResource:strPlistName ofType:@"plist"];

[fileManager copyItemAtPath:bundle toPath:path error:&error];

return YES;

}

else {

return NO;

}

+(void)setPlistData:(NSString *)strPlistName key:(NSString *)key strValue:(NSString *)strValue {

[self setPlist:strPlistName];

NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];

NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile:path];

[data setObject:strValue forKey:key];

//[data setObject:[NSNumber numberWithInt:strValue] forKey:key];

[data writeToFile:path atomically:YES];

}

+(id)getPlistData:(NSString *)strPlistName key:(NSString *)key {

[self setPlist:strPlistName];

NSString *path = [[self getDocsDirectory] stringByAppendingPathComponent:[NSString stringWithFormat:@"%@.plist", strPlistName]];

NSMutableDictionary *data = [[NSMutableDictionary alloc] initWithContentsOfFile: path];

return [data objectForKey:key];

}

October 10, 2013

Install Git on CentOS and Host on Apache

Install git from the yum repository

If you have error regarding GPG KEYS then please check my answer on StackOverflow.com

Install git from the yum repository

yum install git git-daemon

1	yum install git git-daemon

Configure Git and Init bare repository

$ cd /var/www/
$ mkdir git
$ cd git
$ mkdir repos.git
$ cd repos.git
$ git init --bare
$ chown -R apache:apache /var/www/git/
$ mv /var/www/git/repos.git/hooks/post-update.sample /var/www/git/repos.git/hooks/post-update
$ chmod +x /var/www/git/repos.git/hooks/post-update
$ cd /var/www/git/repos.git
$ sudo -u apache git update-server-info
$ cd /etc/httpd/conf.d
$ vim git.conf

$ cd /var/www/

$ mkdir git

$ cd git

$ mkdir repos.git

$ cd repos.git

$ git init --bare

$ chown -R apache:apache /var/www/git/

$ mv /var/www/git/repos.git/hooks/post-update.sample /var/www/git/repos.git/hooks/post-update

$ chmod +x /var/www/git/repos.git/hooks/post-update

$ cd /var/www/git/repos.git

$ sudo -u apache git update-server-info

$ cd /etc/httpd/conf.d

$ vim git.conf

Apache Virtual Host directive

<virtualhost *:80>
	Servername git.example.org
	DocumentRoot /var/www/git
	
	<directory "/var/www/git">
		DAV On
		Options +Indexes +FollowSymLinks 
		
		Deny from all
		AuthType Basic
		AuthName "Git Repository"
		AuthUserFile /etc/git-auth-conf
		AuthGroupFile /etc/git-group-conf
		Require valid-user
	</directory>
</virtualhost>

Servername git.example.org

DocumentRoot /var/www/git

DAV On

Options +Indexes +FollowSymLinks

Deny from all

AuthType Basic

AuthName "Git Repository"

AuthUserFile /etc/git-auth-conf

AuthGroupFile /etc/git-group-conf

Require valid-user

</directory>

</virtualhost>

Restart Apache

$ service httpd restart

1	$ service httpd restart

October 7, 2013

How to serialize and deserialize Java object to and from a flat file?

Runner Class

package com.gaurangjadia.code.java;

import java.awt.event.ActionEvent;
import java.awt.event.ActionListener;
import java.io.File;
import java.io.FileInputStream;
import java.io.FileOutputStream;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.util.Date;

import javax.swing.JFileChooser;
import javax.swing.JFrame;
import javax.swing.UIManager;

public class Runner extends JFrame implements ActionListener {

	private static final long serialVersionUID = 1L;
	
	public String strPath = "";

	private ObjectInputStream oisData;

	public Runner() {
		JFileChooser chooser = new JFileChooser();
	    chooser.setDialogTitle("Select Directory to Save File");
	    chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);
	    chooser.setAcceptAllFileFilterUsed(false);
	    
		int intAction = chooser.showOpenDialog(this);
		
		if (intAction == JFileChooser.APPROVE_OPTION) {
			File f = chooser.getSelectedFile();
			strPath = f.getAbsolutePath();
			
			Example objExampleWrite = new Example("This is Awesome", "This is Great", new Date());
			
			try {
				//Write Object
				FileOutputStream fosData = new FileOutputStream(strPath + "//Example.data");
				ObjectOutputStream oosData = new ObjectOutputStream(fosData);
				oosData.writeObject(objExampleWrite);
				oosData.close();
				fosData.close();
				
				//Read Object
				FileInputStream fisData = new FileInputStream(strPath + "//Example.data"); 
				oisData = new ObjectInputStream(fisData); 
				Example objExampleRead = (Example) oisData.readObject();
				
				System.out.print(objExampleRead);
			}
			catch (Exception e) {
				e.printStackTrace();
			}
		}
	}
	
	public static void main(String[] args) {
		try {
			UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");
		} catch (Exception e) {
			e.printStackTrace();
		}
		
	    run(new Runner(), 250, 110);
	}

	public static void run(JFrame frame, int width, int height) {
		frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);
	    frame.setSize(width, height);
	    frame.setVisible(true);
	}

	public void actionPerformed(ActionEvent e) {
		System.out.println(e);
	}
}

package com.gaurangjadia.code.java;

import java.awt.event.ActionEvent;

import java.awt.event.ActionListener;

import java.io.File;

import java.io.FileInputStream;

import java.io.FileOutputStream;

import java.io.ObjectInputStream;

import java.io.ObjectOutputStream;

import java.util.Date;

import javax.swing.JFileChooser;

import javax.swing.JFrame;

import javax.swing.UIManager;

public class Runner extends JFrame implements ActionListener {

private static final long serialVersionUID = 1L;

public String strPath = "";

private ObjectInputStream oisData;

public Runner() {

JFileChooser chooser = new JFileChooser();

chooser.setDialogTitle("Select Directory to Save File");

chooser.setFileSelectionMode(JFileChooser.DIRECTORIES_ONLY);

chooser.setAcceptAllFileFilterUsed(false);

int intAction = chooser.showOpenDialog(this);

if (intAction == JFileChooser.APPROVE_OPTION) {

File f = chooser.getSelectedFile();

strPath = f.getAbsolutePath();

Example objExampleWrite = new Example("This is Awesome", "This is Great", new Date());

try {

//Write Object

FileOutputStream fosData = new FileOutputStream(strPath + "//Example.data");

ObjectOutputStream oosData = new ObjectOutputStream(fosData);

oosData.writeObject(objExampleWrite);

oosData.close();

fosData.close();

//Read Object

FileInputStream fisData = new FileInputStream(strPath + "//Example.data");

oisData = new ObjectInputStream(fisData);

Example objExampleRead = (Example) oisData.readObject();

System.out.print(objExampleRead);

}

catch (Exception e) {

e.printStackTrace();

}

public static void main(String[] args) {

try {

UIManager.setLookAndFeel("javax.swing.plaf.metal.MetalLookAndFeel");

} catch (Exception e) {

e.printStackTrace();

}

run(new Runner(), 250, 110);

}

public static void run(JFrame frame, int width, int height) {

frame.setDefaultCloseOperation(JFrame.EXIT_ON_CLOSE);

frame.setSize(width, height);

frame.setVisible(true);

}

public void actionPerformed(ActionEvent e) {

System.out.println(e);

}

Example Class to Serialize

package com.gaurangjadia.code.java;

import java.io.Serializable;
import java.util.Date;

public class Example implements Serializable {
	
	private static final long serialVersionUID = 1L;
	
	private String title;
	private String description;
	private Date date;

	public Example(String strTitle, String strDescription, Date dtDate) {
		this.setTitle(strTitle);
		this.setDescription(strDescription);
		this.setDate(dtDate);
	}
	
	@SuppressWarnings("deprecation")
	public String toString() {
		this.getDate();
		return this.getTitle() + " " + this.getDescription() + " " + this.getDate().getYear();
	}
	
	public String getTitle() {
		return title;
	}

	public void setTitle(String title) {
		this.title = title;
	}

	public String getDescription() {
		return description;
	}

	public void setDescription(String description) {
		this.description = description;
	}

	public Date getDate() {
		return date;
	}

	public void setDate(Date date) {
		this.date = date;
	}
}

package com.gaurangjadia.code.java;

import java.io.Serializable;

import java.util.Date;

public class Example implements Serializable {

private static final long serialVersionUID = 1L;

private String title;

private String description;

private Date date;

public Example(String strTitle, String strDescription, Date dtDate) {

this.setTitle(strTitle);

this.setDescription(strDescription);

this.setDate(dtDate);

}

@SuppressWarnings("deprecation")

public String toString() {

this.getDate();

return this.getTitle() + " " + this.getDescription() + " " + this.getDate().getYear();

}

public String getTitle() {

return title;

}

public void setTitle(String title) {

this.title = title;

}

public String getDescription() {

return description;

}

public void setDescription(String description) {

this.description = description;

}

public Date getDate() {

return date;

}

public void setDate(Date date) {

this.date = date;

}

Gaurang Jadia

Nothing is permanent except change

How to Read and Write Data to Property List File(plist) in iOS?

AppHelper.h

AppHelper.m

Install Git on CentOS and Host on Apache

Install git from the yum repository

Install git from the yum repository

Configure Git and Init bare repository

Apache Virtual Host directive

Restart Apache

How to serialize and deserialize Java object to and from a flat file?

Runner Class

Example Class to Serialize