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--Use XmlWorker and XmlNode

Documents for the development of and with JVx.

--Use XmlWorker and XmlNode

Postby Development@SIB » Fri Dec 07, 2012 1:08 pm

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If you work with xml files it's not too easy to use the right parser because there are some of them and if you want a simple parser without writing a lot of source code you need some luck.

We added two classes to JVx that solves simple XML handling.


XML file

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<?xml version="1.0" encoding="UTF-8"?>

<!-- Before begin! -->

  <!-- Test: STARTPORT -->


  <!-- Test: TCP information
      second row
      third row
 after an empty row
  <report name="Standard">
  <report name="User">
  <text>This is a text
from Hansi Huber
<!--  After End -->

Read/Insert/Set tags

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XmlWorker xmw = new XmlWorker();
XmlNode xmn ="simple.xml");

// Read nodes

//Access a single TAG
//Access a TAG from a list

// Insert new nodes

//quick inserts
xmn.insertNode("/server/report(0)", null);
xmn.setNode("/server/report(0)/format", "ABC");

xmn.insertNode("/server/startport(1)", "ABCD");

//with nodes
XmlNode xmnInsert = new XmlNode("ABCD");

xmnInsAttrib  = new XmlNode(XmlNode.TYPE_ATTRIBUTE, "attrib1", xmnInsert);

xmn.insertNode("/server/startport(1)", xmnInsert);

// Set nodes

xmn.setNode("/server/domain", "")

// Save

xmn.write("simple_new.xml", xmn);

It's easy to access and modify information in a XML file. We use '/' as spearator for navigate through the hierarchy and (n) to access tags from a list of tags.

There are more useful methods e.g. find the index of a tag in a list of tags. The following example creates a XML structure in memory.

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XmlNode xmn = XmlNode.createXmlDeclaration();
xmn.insertNode("/server/a/b/c", "A");
xmn.insertNode("/server/a/b/c", "B");
xmn.insertNode("/server/a/b/c", "A");
xmn.insertNode("/server/a/b/c", "B");
xmn.insertNode("/server/a/b/c", "A");
xmn.insertNode("/server/a/b(1)/c", "A");
xmn.insertNode("/server/a/b/b", "A");
XmlNode xmnSearch = xmnRead.getNode("/server/a/b(0)");

//returns 0
xmnSearch.indexOf("/c", "A", 0);
//returns 2
xmnSearch.indexOf("/c", "A", 1);
//returns 3
xmnSearch.indexOf("/c", "A", 3);
//returns 0
xmnSearch.indexOf("/b", "A", 0);

xmn.insertNode("/server/a/b(1)/1", "A");
xmn.insertNode("/server/a/b(2)/2", "A");
xmn.insertNode("/server/a(1)/b/3", "A");

//returns 0
xmn.indexOf("/server/a/b/b", "A", 0)

The <XmlNode>.toString() method returns the XML representation of the node and all sub nodes.
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