Removing XML elements

Question

Hi all!
I have a problem about an xml. I have to eliminate redundancy
So from this xml:
<xml1>
<Property>
<Parameters1>
<Param>
<name>A</name>
<prop></prop> <!--this doesn't matter-->
</Param>
<Param>
<name>B</name>
<prop></prop> <!--this doesn't matter-->
</Param>
<Param>
<name>C</name>
<prop></prop> <!--this doesn't matter-->
</Param>
</Parameters1>
<Parameters2>
<Param>
<name>A</name>
<prop></prop> <!--this doesn't matter-->
</Param>
<Param>
<name>C</name>
<prop></prop> <!--this doesn't matter-->
</Param>
<Param>
<name>D</name>
<prop></prop> <!--this doesn't matter-->
</Param>
</Parameters2>
</Property>
</xml1>
I want to obtain this xml:
<xml2>
<Property>
<Parameters1>
<Param>
<name>A</name>
<prop></prop> <!--this doesn't matter-->
</Param>
<Param>
<name>B</name>
<prop></prop> <!--this doesn't matter-->
</Param>
<Param>
<name>C</name>
<prop></prop> <!--this doesn't matter-->
</Param>
</Parameters1>
<Parameters2>
<!--Parameters A and C are missing-->
<Param>
<name>D</name>
<prop></prop> <!--this doesn't matter-->
</Param>
</Parameters2>
</Property>
</xml2>
There are just parameters without repeting.
My code until now is:
private String numeParam;
private Vector elParam = new Vector();
for (int i=0;i<rootlist2.getLength();i++)
Element element2 = (Element)rootlist2.item(i); // rootlist is my doc xml
if (element2.getLocalName()==Property)
NodeList childrenName2 = element2.getChildNodes();
for (j=0;j<childrenName2.getLength();j++)
Element elemm = (Element)childrenName2.item(j);
if ((elemm.getLocalName() == "Parameters1")||(elemm.getLocalName() == "Parameters2"))
NodeList param = elemm.getChildNodes();
for(int y=0;y<param.getLength();y++)
bn=true;
bas=true;
Element childInProperty2 = (Element)param.item(m2); // acesta e de sters
if (childInProperty2.getLocalName() == Param)
NodeList tlist =childInProperty2.getChildNodes();
for (int y = 0;y<tlist.length();y++)
Element childInPUParam2 = (Element)tlist.item(y);
if (childInPUParam2.getLocalName()== "name")
numeParam = childInPUParam2.getTextContent();
bas=false;
if (bas==false)
if (!elParam.contains(numeParam))
elParam.addElement(numeParam);
if (elParam.contains(numeParam))
bn=false;
break;
} end if
} // end for
if (bn==false)
ba = false;
if (bn==false)
System.out.println("C");
ba = false;
elParam.clear();
this is working I a kind of way, but this remove some elements that is not god. I wonder... Is like elParam contains some strings but, after me is imposible.
Thanks all

Answer 1

Why don't you use XPath? Anyway.
-> Get a List of the documents Node
-> Get a List of all children
You have to check each Node:
-> if the node is not null
-> if the node's name is not null
-> if the node's content is not null
-> if the node's name is equals (<name>)
If the Node-Element is found, store it in a Collection (the reference of the node object).
Later you could iterate the collection and remove all Nodes from the Document.
Afterwards you can transfer the document to a xml file.
btw: if you use XPath you have to be sure to use at least Java 1.5
Regards,
Florian