Object serialization: Difference between revisions

=={{header|Ada}}==

This file contains the package specification containing the public definitions of the inheritance tree rooted at the type ''Message''. Each type in the inheritance tree has its own print procedure.

 

package Messages is

procedure Print(Item : Control_Message);

 

The next portion contains the implementation of the procedures defined in the package specification.

with Ada.Integer_Text_Io; use Ada.Integer_Text_Io;

with Ada.Float_Text_IO; use Ada.Float_Text_IO;

end Display;

 

The final section of code creates objects of the three message types and performs the printing, writing, and reading. The Ada attributes '' 'Class'Output'' serialize the object and write it to the specified stream. The '' 'Class'Input'' attributes call a function automatically provided by the compiler which reads from the specified stream file and returns the object read. The ''Display'' procedure takes an object in the inheritance tree rooted at ''Message'' and dispatches the correct print procedure.

 

with Ada.Streams.Stream_Io; use Ada.Streams.Stream_Io;

with Ada.Calendar; use Ada.Calendar;

end loop;

Close(The_File);

Output results:

Time Stamp:2007-3-9

surgeon.addExit(makeArrival, "makeArrival")

 

def objs := [makeEvent(timer.now()),

 

=={{header|Java}}==

 

// classes must implement java.io.Serializable in order to be serializable

}

}

 

=={{header|OCaml}}==

Objects which contain methods are difficult to serialize because it will want to serialize those methods too, but functions usually cannot be serialized. Instead, here we perform the task on non-object datatypes, with an outside function to print them.

 

 

let create_entity () = { name = "Entity" }

 

print_entity result1;;

 

=={{header|Perl}}==

{{libheader|Storable}}

package Greeting;

sub new {

print $g2->stringify;

print $s2->stringify;

 

=={{header|PHP}}==

Serialization in PHP is straightforward. The built-in function [http://www.php.net/manual/en/function.serialize.php serialize()] handles it in a single statement.

In order to un-serialize the object, use the [http://www.php.net/manual/en/function.unserialize.php unserialize()] function. Note that the class of object must be defined in the script where un-serialization takes place, or the class' methods will be lost.

 

=={{header|Python}}==

# serialization in python is accomplished via the Pickle module.

# Alternatively, one can use the cPickle module if speed is the key,

 

i1.printName()

 

=={{header|Ruby}}==

def initialize(specialty=nil)

@specialty=specialty

end.join("\n\n")

)