Hi,
I see, you want a helper function to do all that on one line.
It might perhaps be useful to have the map of uris as a constant
(a.k.a. public static final) somewhere in your code, so you don't have to
construct it all the times, when it's likely to be the same over and over.
Then you might have something like
public static Node selectSingleNode( Node contextNode, String xpathExpression,
Map namespaces )
{
org.dom4j.XPath xpath = contextNode.createXPath( xpathExpression );
xpath.setNamespaceURIs( namespaces );
return xpath.selectSingleNode( contextNode );
}
pretty much anywhere in your code.
You might also consider adding a method like this to the Node interface
and submitting it as an addition.
Jan
Dne pátek 01 listopad 2002 13:17 Tom Oehser napsal(a):
| Right, I know that XPath doesn't care *which* prefix that is bound
| to the URI I use, but, I still have to use *one* of them, and not
| leave it off, even if it is in the default.
|
| That is, if I'm reading documents of the form //?:a/?:b/?:c, and I
| know that ? is bound to http://x.y.z, but I _don't_ know for sure
| what the prefix will be, what is the best way to select Node z given
| a document object?
|
| What I have been doing is
|
| > | private Map uris = new HashMap();
| > | uris.put("m",NAMESPACE);
| > | org.dom4j.XPath xpath = doc.createXPath("//m:what/m:ever");
| > | xpath.setNamespaceURIs(uris);
| > | org.dom4j.Node node = xpathSel.selectSingleNode(doc);
|
| What I really want is something like:
|
| doc.selectSingleNode("//my:a/my:b/my:c","my","http://x.y.z";);
|
| I think...
|
| -Tom
|
| On Fri, 1 Nov 2002, Jan Dvorak wrote:
| > Date: Fri, 1 Nov 2002 09:13:43 +0100
| > From: Jan Dvorak <[EMAIL PROTECTED]>
| > To: Tom Oehser <[EMAIL PROTECTED]>, [EMAIL PROTECTED]
| > Subject: Re: [dom4j-dev] selecting nodes when URI is known but prefix is
| > not
| >
| > Hi,
| >
| > XPath matching doesn't care about prefices in the instance document
| > searched. Although possible, it's by no means straightforward to write an
| > XPath that matches a particular prefix.
| >
| > Beware: The prefix you use in writing your XPath expressions has no
| > relationship whatsoever to the prefix of the node in the instance
| > document.
| >
| > What counts in the matching are the URIs these prefices are bound to,
| > plus the local names, of course. These two things equal in the XPath
| > expression and in a node in the instance document, the node is matched.
| >
| > You could well have the default prefix in the instance document,
| > while in XPath you have to use an explicit prefix, should the nodes be
| > namespace-qualified. The prefices can differ.
| >
| > Example: The XPath expression
| > //x:stuff where prefix x is bound to
| > 'urn:xmlns:com.example.stuff-1.0' will match the following elements:
| > <x:stuff xmlns:x="urn:xmlns:com.example.stuff-1.0"/>
| > <y:stuff xmlns:y="urn:xmlns:com.example.stuff-1.0"/>
| > <my-weird-prefix:stuff
| > xmlns:my-weird-prefix="urn:xmlns:com.example.stuff-1.0"/>
| > <stuff xmlns="urn:xmlns:com.example.stuff-1.0"/>
| >
| >
| > Jan Dvorak
| > MathAn Praha, Ltd.
| >
| > | Hi,
| > |
| > | I find myself doing things like:
| > |
| > | private Map uris = new HashMap();
| > | uris.put("m",NAMESPACE);
| > | org.dom4j.XPath xpath = doc.createXPath("//m:what/m:ever");
| > | xpath.setNamespaceURIs(uris);
| > | org.dom4j.Node node = xpathSel.selectSingleNode(doc);
| > |
| > | Instead of
| > |
| > | doc.selectSingleNode("//?:what/?:ever");
| > |
| > | Because I know the namespace URI but not the prefix (which could be the
| > | default prefix).
| > |
| > | Is there an easier way to select a node using an xpath when I don't
| > | know the prefix?
| > |
| > | -Tom
| >
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