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# ACEXML_NamespaceSupport Class Reference

ACEXML_NamespaceSupport provides namespace management operation for an XML parser. More...

`#include <NamespaceSupport.h>`

Collaboration diagram for ACEXML_NamespaceSupport:

[legend]
List of all members.

## Public Methods
| ACEXML_NamespaceSupport (void)
| ~ACEXML_NamespaceSupport (void)
int | init (void)
int | declarePrefix (const ACEXML_Char *prefix, const ACEXML_Char *uri)
int | getDeclaredPrefixes (ACEXML_STR_LIST &prefixes) const
const ACEXML_Char * | getPrefix (const ACEXML_Char *uri) const
int | getPrefixes (ACEXML_STR_LIST &prefixes) const
int | getPrefixes (const ACEXML_Char *uri, ACEXML_STR_LIST &prefixes) const
const ACEXML_Char * | getURI (const ACEXML_Char *prefix) const
int | popContext (void)
int | processName (const ACEXML_Char *qName, const ACEXML_Char *&uri, const ACEXML_Char *&name, int is_attribute) const
int | pushContext (void)
int | reset (void)
## Static Public Attributes
const ACEXML_Char * | XMLNS_PREFIX = ACEXML_XMLNS_PREFIX_name
const ACEXML_Char * | XMLNS = ACEXML_XMLNS_URI_name
## Private Attributes
ACEXML_Namespace_Context_Stack | ns_stack_
ACEXML_NS_CONTEXT * | effective_context_

## Detailed Description

ACEXML_NamespaceSupport provides namespace management operation for an XML parser.

This class encapsulates the logic of Namespace processing: it tracks the declarations currently in force for each context and automatically processes qualified XML 1.0 names into their Namespace parts; it can also be used in reverse for generating XML 1.0 from Namespaces.

Namespace support objects are reusable, but the reset method must be invoked between each session.

Here is a simple session (in Java :-p):

      String parts[] = new String[3];
      NamespaceSupport support = new NamespaceSupport();

      support.pushContext();
      support.declarePrefix("", "http://www.w3.org/1999/xhtml");
      support.declarePrefix("dc", "http://www.purl.org/dc#");

      String parts[] = support.processName("p", parts, false);
      System.out.println("Namespace URI: " + parts[0]);
      System.out.println("Local name: " + parts[1]);
      System.out.println("Raw name: " + parts[2]);

      String parts[] = support.processName("dc:title", parts, false);
      System.out.println("Namespace URI: " + parts[0]);
      System.out.println("Local name: " + parts[1]);
      System.out.println("Raw name: " + parts[2]);

      support.popContext();

Note that this class is optimized for the use case where most elements do not contain Namespace declarations: if the same prefix/URI mapping is repeated for each context (for example), this class will be somewhat less efficient.

See also:
  ACEXML_Exception

## Constructor & Destructor Documentation

ACEXML_NamespaceSupport::ACEXML_NamespaceSupport | ( | void |  | ) |

| Default constructor.

ACEXML_NamespaceSupport::~ACEXML_NamespaceSupport | ( | void |  | ) |

| Default destructor.

## Member Function Documentation

int ACEXML_NamespaceSupport::declarePrefix | ( | const ACEXML_Char * | prefix,
|  | const ACEXML_Char * | uri
| ) |

| Declare a Namespace prefix. Return -1 if the prefix was illegal or an internal error occured. Return 0 if the prefix gets declared successfully, 1 if the prefix replaces an existing prefix definition.

int ACEXML_NamespaceSupport::getDeclaredPrefixes | ( | ACEXML_STR_LIST & | prefixes | ) | const

| Return all prefixes declared in current context in the user-supplied list prefixes. It is user's reponsibility to ensure the list was empty originally.

const ACEXML_Char * ACEXML_NamespaceSupport::getPrefix | ( | const ACEXML_Char * | uri | ) | const

| Return one of the prefixes mapped to a Namespace URI.

int ACEXML_NamespaceSupport::getPrefixes | ( | const ACEXML_Char * | uri,
|  | ACEXML_STR_LIST & | prefixes
| ) | const

| Return all prefixes currently declared for a URI in the user-supplied list.

int ACEXML_NamespaceSupport::getPrefixes | ( | ACEXML_STR_LIST & | prefixes | ) | const

| Return all prefixes currently declared in the user-supplied list. @ Known bug: This function should only return user-defined prefixes.

const ACEXML_Char * ACEXML_NamespaceSupport::getURI | ( | const ACEXML_Char * | prefix | ) | const

| Look up a prefix and get the currently-mapped Namespace URI.

int ACEXML_NamespaceSupport::init | ( | void |  | ) |

| Initialize the namespace support object

int ACEXML_NamespaceSupport::popContext | ( | void |  | ) |

| Revert to the previous namespace context.

int ACEXML_NamespaceSupport::processName | ( | const ACEXML_Char * | qName,
|  | const ACEXML_Char *& | uri,
|  | const ACEXML_Char *& | name,
|  | int | is_attribute
| ) | const

| Process a raw XML 1.0 name. qName is the raw XML name we want to parse, uri contains the URI string of the raw name. It points to a null string if the namespace is not valid or there's no namespace defined. name contains the original name without the prefix. is_attribute specifies whether the name is an attribute or not. Attributes have different scoping rules from elements.

int ACEXML_NamespaceSupport::pushContext | ( | void |  | ) |

| Start a new Namespace context. Prefixes defined in previous context are copied over to the new context.

int ACEXML_NamespaceSupport::reset | ( | void |  | ) |

| Reset this Namespace support object for reuse.

## Member Data Documentation

ACEXML_NS_CONTEXT* ACEXML_NamespaceSupport::effective_context_`[private]`

| The effective namespace context.

ACEXML_Namespace_Context_Stack ACEXML_NamespaceSupport::ns_stack_`[private]`

| Namespace Context stack. When we entering a new namespace context, the old context is duplicated and pushed into this stack.

const ACEXML_Char * ACEXML_NamespaceSupport::XMLNS = ACEXML_XMLNS_URI_name`[static]`

const ACEXML_Char * ACEXML_NamespaceSupport::XMLNS_PREFIX = ACEXML_XMLNS_PREFIX_name`[static]`

| XMLNS default prefix and URI strings.

The documentation for this class was generated from the following files:

- NamespaceSupport.h
- NamespaceSupport.cpp