public class NamespaceSupport2 extends org.xml.sax.helpers.NamespaceSupport
This class is an attempt to rewrite the SAX NamespaceSupport "helper" class for improved efficiency. It can be used to track the namespace declarations currently in scope, providing lookup routines to map prefixes to URIs and vice versa.
ISSUE: For testing purposes, I've extended NamespaceSupport even though I'm completely reasserting all behaviors and fields. Wasteful.... But SAX did not put an interface under that object and we seem to have written that SAX class into our APIs... and I don't want to argue with it right now.
|Modifier and Type||Field and Description|
The XML Namespace as a constant.
|Constructor and Description|
Create a new Namespace support object.
|Modifier and Type||Method and Description|
Declare a Namespace prefix.
Return an enumeration of all prefixes declared in this context.
Return one of the prefixes mapped to a Namespace URI.
Return an enumeration of all prefixes currently declared.
Return an enumeration of all prefixes currently declared for a URI.
Look up a prefix and get the currently-mapped Namespace URI.
Revert to the previous Namespace context.
Process a raw XML 1.0 name.
Start a new Namespace context.
Reset this Namespace support object for reuse.
public void reset()
It is necessary to invoke this method before reusing the Namespace support object for a new session.
public void pushContext()
Normally, you should push a new context at the beginning of each XML element: the new context will automatically inherit the declarations of its parent context, but it will also keep track of which declarations were made within this context.
The Namespace support object always starts with a base context already in force: in this context, only the "xml" prefix is declared.
public void popContext()
Normally, you should pop the context at the end of each XML element. After popping the context, all Namespace prefix mappings that were previously in force are restored.
You must not attempt to declare additional Namespace prefixes after popping a context, unless you push another context first.
This method declares a prefix in the current Namespace context; the prefix will remain in force until this context is popped, unless it is shadowed in a descendant context.
To declare a default Namespace, use the empty string. The prefix must not be "xml" or "xmlns".
Note that you must not declare a prefix after you've pushed and popped another Namespace.
Note that there is an asymmetry in this library: while
getPrefix will not return the default "" prefix,
even if you have declared one; to check for a default prefix,
you have to look it up explicitly using
This asymmetry exists to make it easier to look up prefixes
for attribute names, where the default prefix is not allowed.
prefix- The prefix to declare, or null for the empty string.
uri- The Namespace URI to associate with the prefix.
processName(java.lang.String, java.lang.String, boolean),
This method processes a raw XML 1.0 name in the current context by removing the prefix and looking it up among the prefixes currently declared. The return value will be the array supplied by the caller, filled in as follows:
All of the strings in the array will be internalized. If the raw name has a prefix that has not been declared, then the return value will be null.
Note that attribute names are processed differently than element names: an unprefixed element name will received the default Namespace (if any), while an unprefixed element name will not.
qName- The raw XML 1.0 name to be processed.
parts- A string array supplied by the caller, capable of holding at least three members.
isAttribute- A flag indicating whether this is an attribute name (true) or an element name (false).
This method looks up the prefix in the current context. Use the empty string ("") for the default Namespace.
public Enumeration getPrefixes()
Note: if there is a default prefix, it will not be
returned in this enumeration; check for the default prefix
getURI with an argument of "".
If more than one prefix is currently mapped to the same
URI, this method will make an arbitrary selection; if you
want all of the prefixes, use the
Note: this will never return the empty
(default) prefix; to check for a default prefix, use the
getURI method with an argument of "".
uri- The Namespace URI.
public Enumeration getPrefixes(String uri)
This method returns prefixes mapped to a specific Namespace
URI. The xml: prefix will be included. If you want only one
prefix that's mapped to the Namespace URI, and you don't care
which one you get, use the
Note: the empty (default) prefix is
never included in this enumeration; to check for the
presence of a default Namespace, use the
method with an argument of "".
public Enumeration getDeclaredPrefixes()
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