XML files

Jolie natively supports automatic conversions between Jolie and XML data structures. The File library service leverages this to offer simple ways of reading from and writing to XML files.

Reading from an XML file

Suppose that you had an XML file called note.xml with the following content.

<note><from>John</from><to>Jane</to><content>I made pasta</content></note>

You can read from this file and obtain a Jolie data structure as follows.

from file import File

service Example {

    embed File as file

    main  {
        readFile@file( {
            filename = "note.xml"
            format = "xml"
        } )( data )
        // data is now { note << { from = "John" to = "Jane" content = "I made pasta" } }
    }
}

Variable data now contains the data from the XML structure, which you can access as usual using the standard Jolie syntax. For example, to print the to node of the note, you can import the standard library console at the beginning of the program and write and use the operation println@console(data.node.to)()

from file import File
from console import Console

service Example {

embed File as file
embed Console as console

    main {
        readFile@file( {
            filename = "note.xml"
            format = "xml"
        } )( data )
        // data is now { note << { from = "John" to = "Jane" content = "I made pasta" } }
        println@console(data.node.to)()
    }
}

Writing to an XML file

Suppose that you wanted to store the following data structure as an XML file.

{
    note << {
        from = "John"
        to = "Jane"
        content = "I made pasta"
    }
}

You can do so by invoking writeFile@file and passing that data structure as the content to be written.

from file import File

service Example {

    embed File as file
    main
    {
        writeFile@file( {
            filename = "note.xml"
            format = "xml"
            content << {
                note << {
                    from = "John"
                    to = "Jane"
                    content = "I made pasta"
                }
            }
        })()
    }
}

The file note.xml will now contain the XML data that we showed at the beginning of the tutorial.