|
zenilib
0.5.3.0
|
#include <tinyxml.h>
A TiXmlHandle is a class that wraps a node pointer with null checks; this is an incredibly useful thing. Note that TiXmlHandle is not part of the TinyXml DOM structure. It is a separate utility class.
Take an example:
<Document>
<Element attributeA = "valueA">
<Child attributeB = "value1" />
<Child attributeB = "value2" />
</Element>
<Document>
Assuming you want the value of "attributeB" in the 2nd "Child" element, it's very easy to write a lot of code that looks like:
TiXmlElement* root = document.FirstChildElement( "Document" );
if ( root )
{
TiXmlElement* element = root->FirstChildElement( "Element" );
if ( element )
{
TiXmlElement* child = element->FirstChildElement( "Child" );
if ( child )
{
TiXmlElement* child2 = child->NextSiblingElement( "Child" );
if ( child2 )
{
// Finally do something useful.
And that doesn't even cover "else" cases. TiXmlHandle addresses the verbosity of such code. A TiXmlHandle checks for null pointers so it is perfectly safe and correct to use:
TiXmlHandle docHandle( &document );
TiXmlElement* child2 = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", 1 ).ToElement();
if ( child2 )
{
// do something useful
Which is MUCH more concise and useful.
It is also safe to copy handles - internally they are nothing more than node pointers.
TiXmlHandle handleCopy = handle;
What they should not be used for is iteration:
int i=0;
while ( true )
{
TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).Child( "Child", i ).ToElement();
if ( !child )
break;
// do something
++i;
}
It seems reasonable, but it is in fact two embedded while loops. The Child method is a linear walk to find the element, so this code would iterate much more than it needs to. Instead, prefer:
TiXmlElement* child = docHandle.FirstChild( "Document" ).FirstChild( "Element" ).FirstChild( "Child" ).ToElement();
for( child; child; child=child->NextSiblingElement() )
{
// do something
}
|
inline |
Create a handle from any node (at any depth of the tree.) This can be a null pointer.
Definition at line 1635 of file tinyxml.h.
Referenced by Child(), ChildElement(), FirstChild(), and FirstChildElement().
|
inline |
| TiXmlHandle TiXmlHandle::Child | ( | const char * | value, |
| int | index | ||
| ) | const |
Return a handle to the "index" child with the given name. The first child is 0, the second 1, etc.
Definition at line 1652 of file tinyxml.cpp.
References TiXmlNode::FirstChild(), i, TiXmlNode::NextSibling(), and TiXmlHandle().
| TiXmlHandle TiXmlHandle::Child | ( | int | index | ) | const |
Return a handle to the "index" child. The first child is 0, the second 1, etc.
Definition at line 1633 of file tinyxml.cpp.
References TiXmlNode::FirstChild(), i, TiXmlNode::NextSibling(), and TiXmlHandle().
| TiXmlHandle TiXmlHandle::ChildElement | ( | const char * | value, |
| int | index | ||
| ) | const |
Return a handle to the "index" child element with the given name. The first child element is 0, the second 1, etc. Note that only TiXmlElements are indexed: other types are not counted.
Definition at line 1690 of file tinyxml.cpp.
References TiXmlNode::FirstChildElement(), i, TiXmlNode::NextSiblingElement(), and TiXmlHandle().
| TiXmlHandle TiXmlHandle::ChildElement | ( | int | index | ) | const |
Return a handle to the "index" child element. The first child element is 0, the second 1, etc. Note that only TiXmlElements are indexed: other types are not counted.
Definition at line 1671 of file tinyxml.cpp.
References TiXmlNode::FirstChildElement(), i, TiXmlNode::NextSiblingElement(), and TiXmlHandle().
|
inline |
| TiXmlHandle TiXmlHandle::FirstChild | ( | ) | const |
Return a handle to the first child node.
Definition at line 1585 of file tinyxml.cpp.
References TiXmlNode::FirstChild(), and TiXmlHandle().
| TiXmlHandle TiXmlHandle::FirstChild | ( | const char * | value | ) | const |
Return a handle to the first child node with the given name.
Definition at line 1597 of file tinyxml.cpp.
References TiXmlNode::FirstChild(), and TiXmlHandle().
| TiXmlHandle TiXmlHandle::FirstChildElement | ( | ) | const |
Return a handle to the first child element.
Definition at line 1609 of file tinyxml.cpp.
References TiXmlNode::FirstChildElement(), and TiXmlHandle().
| TiXmlHandle TiXmlHandle::FirstChildElement | ( | const char * | value | ) | const |
Return a handle to the first child element with the given name.
Definition at line 1621 of file tinyxml.cpp.
References TiXmlNode::FirstChildElement(), and TiXmlHandle().
|
inline |
|
inline |
Return the handle as a TiXmlElement. This may return null.
Definition at line 1681 of file tinyxml.h.
Referenced by Zeni::XML_Element_c::good(), Zeni::XML_Element_c::to_string(), and Zeni::XML_Element_c::value().
|
inline |
Return the handle as a TiXmlNode. This may return null.
Definition at line 1678 of file tinyxml.h.
Referenced by Zeni::XML_Element_c::child(), Zeni::XML_Element_c::child_element(), Zeni::XML_Element::create_child(), Zeni::XML_Element_c::first(), Zeni::XML_Element::first(), Zeni::XML_Element_c::first_child(), Zeni::XML_Element_c::first_child_element(), Zeni::XML_Element_c::next(), Zeni::XML_Element::next(), Zeni::XML_Element_c::operator[](), Zeni::XML_Element::operator[](), Zeni::XML_Element::remove_child(), and Zeni::XML_Element::set_string().
|
inline |
|
inline |
Return the handle as a TiXmlUnknown. This may return null.
|
inline |
1.8.5