Xerces-C++: Attributes Class Reference

Xerces-C++ 3.3.0

List of all members
Attributes Class Referenceabstract

Interface for an element's attribute specifications. More...

`#include <xercesc/sax2/Attributes.hpp>`

## Public Member Functions
Constructors and Destructor
| Attributes ()
| Default constructor.
virtual | ~Attributes ()
| Destructor.

## The virtual attribute list interface
virtual XMLSize_t | getLength () const =0
| Return the number of attributes in this list.
virtual const XMLCh * | getURI (const XMLSize_t index) const =0
| Return the namespace URI of an attribute in this list (by position).
virtual const XMLCh * | getLocalName (const XMLSize_t index) const =0
| Return the local name of an attribute in this list (by position).
virtual const XMLCh * | getQName (const XMLSize_t index) const =0
| Return the qName of an attribute in this list (by position).
virtual const XMLCh * | getType (const XMLSize_t index) const =0
| Return the type of an attribute in the list (by position).
virtual const XMLCh * | getValue (const XMLSize_t index) const =0
| Return the value of an attribute in the list (by position).
virtual bool | getIndex (const XMLCh *const uri, const XMLCh *const localPart, XMLSize_t &index) const =0
| Look up the index of an attribute by Namespace name.
virtual int | getIndex (const XMLCh *const uri, const XMLCh *const localPart) const =0
| Look up the index of an attribute by Namespace name.
virtual bool | getIndex (const XMLCh *const qName, XMLSize_t &index) const =0
| Look up the index of an attribute by XML 1.0 qualified name.
virtual int | getIndex (const XMLCh *const qName) const =0
| Look up the index of an attribute by XML 1.0 qualified name.
virtual const XMLCh * | getType (const XMLCh *const uri, const XMLCh *const localPart) const =0
| Look up an attribute's type by Namespace name.
virtual const XMLCh * | getType (const XMLCh *const qName) const =0
| Look up an attribute's type by XML 1.0 qualified name.
virtual const XMLCh * | getValue (const XMLCh *const uri, const XMLCh *const localPart) const =0
| Look up an attribute's value by Namespace name.
virtual const XMLCh * | getValue (const XMLCh *const qName) const =0
| Look up an attribute's value by XML 1.0 qualified name.

## Detailed Description

Interface for an element's attribute specifications.

The SAX2 parser implements this interface and passes an instance to the SAX2 application as the last argument of each startElement event.

The instance provided will return valid results only during the scope of the startElement invocation (to save it for future use, the application must make a copy: the AttributesImpl helper class provides a convenient constructor for doing so).

An Attributes includes only attributes that have been specified or defaulted: #IMPLIED attributes will not be included.

There are two ways for the SAX application to obtain information from the Attributes. First, it can iterate through the entire list:

`public void startElement (String uri, String localpart, String qName, Attributes atts) {
for (XMLSize_t i = 0; i < atts.getLength(); i++) {
String Qname = atts.getQName(i);
String URI = atts.getURI(i)
String local = atts.GetLocalName(i)
String type = atts.getType(i);
String value = atts.getValue(i);
[...]
}
}`

(Note that the result of getLength() will be zero if there are no attributes.)

As an alternative, the application can request the value or type of specific attributes:

`public void startElement (String uri, String localpart, String qName, Attributes atts) {
String identifier = atts.getValue("id");
String label = atts.getValue("label");
[...]
}`

The AttributesImpl helper class provides a convenience implementation for use by parser or application writers.

See also
  Sax2DocumentHandler::startElement
  AttributesImpl::AttributesImpl

## Constructor & Destructor Documentation

## ◆ Attributes()

Attributes::Attributes | ( |  | ) |

Default constructor.

## ◆ ~Attributes()

virtual Attributes::~Attributes | ( |  | ) |
| virtual

Destructor.

## Member Function Documentation

## ◆ getIndex() [1/4]

virtual int Attributes::getIndex | ( | const XMLCh *const | qName | ) | const
| pure virtual

Look up the index of an attribute by XML 1.0 qualified name.

Parameters

  qName | The qualified (prefixed) name.

Returns
  The index of the attribute, or -1 if it does not appear in the list.

## ◆ getIndex() [2/4]

virtual bool Attributes::getIndex | ( | const XMLCh *const | qName,
|  | XMLSize_t & | index ) const
| pure virtual

Look up the index of an attribute by XML 1.0 qualified name.

Non-standard extension.

Parameters

  qName | The qualified (prefixed) name.
  index | Reference to the variable where the index will be stored.

Returns
  true if the attribute is found and false otherwise.

## ◆ getIndex() [3/4]

virtual int Attributes::getIndex | ( | const XMLCh *const | uri,
|  | const XMLCh *const | localPart ) const
| pure virtual

Look up the index of an attribute by Namespace name.

Parameters

  uri | The Namespace URI, or the empty string if the name has no Namespace URI.
  localPart | The attribute's local name.

Returns
  The index of the attribute, or -1 if it does not appear in the list.

## ◆ getIndex() [4/4]

virtual bool Attributes::getIndex | ( | const XMLCh *const | uri,
|  | const XMLCh *const | localPart,
|  | XMLSize_t & | index ) const
| pure virtual

Look up the index of an attribute by Namespace name.

Non-standard extension.

Parameters

  uri | The Namespace URI, or the empty string if the name has no Namespace URI.
  localPart | The attribute's local name.
  index | Reference to the variable where the index will be stored.

Returns
  true if the attribute is found and false otherwise.

## ◆ getLength()

virtual XMLSize_t Attributes::getLength | ( |  | ) | const
| pure virtual

Return the number of attributes in this list.

The SAX parser may provide attributes in any arbitrary order, regardless of the order in which they were declared or specified. The number of attributes may be zero.

Returns
  The number of attributes in the list.

## ◆ getLocalName()

virtual const XMLCh * Attributes::getLocalName | ( | const XMLSize_t | index | ) | const
| pure virtual

Return the local name of an attribute in this list (by position).

The QNames must be unique: the SAX parser shall not include the same attribute twice. Attributes without values (those declared #IMPLIED without a value specified in the start tag) will be omitted from the list.

Parameters

  index | The index of the attribute in the list (starting at 0).

Returns
  The local name of the indexed attribute, or null if the index is out of range.

See also
  getLength

## ◆ getQName()

virtual const XMLCh * Attributes::getQName | ( | const XMLSize_t | index | ) | const
| pure virtual

Return the qName of an attribute in this list (by position).

The QNames must be unique: the SAX parser shall not include the same attribute twice. Attributes without values (those declared #IMPLIED without a value specified in the start tag) will be omitted from the list.

Parameters

  index | The index of the attribute in the list (starting at 0).

Returns
  The qName of the indexed attribute, or null if the index is out of range.

See also
  getLength

## ◆ getType() [1/3]

virtual const XMLCh * Attributes::getType | ( | const XMLCh *const | qName | ) | const
| pure virtual

Look up an attribute's type by XML 1.0 qualified name.

See getType for a description of the possible types.

Parameters

  qName | The XML 1.0 qualified name.

Returns
  The attribute type as a string, or null if the attribute is not in the list or if qualified names are not available.

## ◆ getType() [2/3]

virtual const XMLCh * Attributes::getType | ( | const XMLCh *const | uri,
|  | const XMLCh *const | localPart ) const
| pure virtual

Look up an attribute's type by Namespace name.

See getType for a description of the possible types.

Parameters

  uri | The Namespace URI, or the empty String if the name has no Namespace URI.
  localPart | The local name of the attribute.

Returns
  The attribute type as a string, or null if the attribute is not in the list or if Namespace processing is not being performed.

## ◆ getType() [3/3]

virtual const XMLCh * Attributes::getType | ( | const XMLSize_t | index | ) | const
| pure virtual

Return the type of an attribute in the list (by position).

The attribute type is one of the strings "CDATA", "ID", "IDREF", "IDREFS", "NMTOKEN", "NMTOKENS", "ENTITY", "ENTITIES", or "NOTATION" (always in upper case).

If the parser has not read a declaration for the attribute, or if the parser does not report attribute types, then it must return the value "CDATA" as stated in the XML 1.0 Recommendation (clause 3.3.3, "Attribute-Value Normalization").

For an enumerated attribute that is not a notation, the parser will report the type as "NMTOKEN".

Parameters

  index | The index of the attribute in the list (starting at 0).

Returns
  The attribute type as a string, or null if the index is out of range.

See also
  getLength
  getType

## ◆ getURI()

virtual const XMLCh * Attributes::getURI | ( | const XMLSize_t | index | ) | const
| pure virtual

Return the namespace URI of an attribute in this list (by position).

The QNames must be unique: the SAX parser shall not include the same attribute twice. Attributes without values (those declared #IMPLIED without a value specified in the start tag) will be omitted from the list.

Parameters

  index | The index of the attribute in the list (starting at 0).

Returns
  The URI of the indexed attribute, or null if the index is out of range.

See also
  getLength

## ◆ getValue() [1/3]

virtual const XMLCh * Attributes::getValue | ( | const XMLCh *const | qName | ) | const
| pure virtual

Look up an attribute's value by XML 1.0 qualified name.

See getValue for a description of the possible values.

Parameters

  qName | The XML 1.0 qualified name.

Returns
  The attribute value as a string, or null if the attribute is not in the list or if qualified names are not available.

## ◆ getValue() [2/3]

virtual const XMLCh * Attributes::getValue | ( | const XMLCh *const | uri,
|  | const XMLCh *const | localPart ) const
| pure virtual

Look up an attribute's value by Namespace name.

See getValue for a description of the possible values.

Parameters

  uri | The Namespace URI, or the empty String if the name has no Namespace URI.
  localPart | The local name of the attribute.

Returns
  The attribute value as a string, or null if the attribute is not in the list.

## ◆ getValue() [3/3]

virtual const XMLCh * Attributes::getValue | ( | const XMLSize_t | index | ) | const
| pure virtual

Return the value of an attribute in the list (by position).

If the attribute value is a list of tokens (IDREFS, ENTITIES, or NMTOKENS), the tokens will be concatenated into a single string separated by whitespace.

Parameters

  index | The index of the attribute in the list (starting at 0).

Returns
  The attribute value as a string, or null if the index is out of range.

See also
  getLength
  getValue

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

- Attributes.hpp