BDE 4.14.0 Production release
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#include <balxml_reader.h>
Public Member Functions | |
virtual | ~Reader (void) |
void | dumpNode (bsl::ostream &os) const |
bool | isFatalError () const |
bool | isError () const |
bool | isWarning () const |
virtual void | setPrefixStack (PrefixStack *prefixes)=0 |
virtual void | setResolver (XmlResolverFunctor resolver)=0 |
virtual int | open (const char *filename, const char *encoding=0)=0 |
virtual int | open (const char *buffer, bsl::size_t size, const char *url=0, const char *encoding=0)=0 |
virtual int | open (bsl::streambuf *stream, const char *url=0, const char *encoding=0)=0 |
virtual void | close ()=0 |
virtual int | advanceToNextNode ()=0 |
virtual int | lookupAttribute (ElementAttribute *attribute, int index) const =0 |
virtual int | lookupAttribute (ElementAttribute *attribute, const char *qname) const =0 |
virtual int | lookupAttribute (ElementAttribute *attribute, const char *localName, const char *namespaceUri) const =0 |
virtual int | lookupAttribute (ElementAttribute *attribute, const char *localName, int namespaceId) const =0 |
virtual void | setOptions (unsigned int flags)=0 |
virtual const char * | documentEncoding () const =0 |
virtual XmlResolverFunctor | resolver () const =0 |
Return the external XML resource resolver. | |
virtual bool | isOpen () const =0 |
virtual const ErrorInfo & | errorInfo () const =0 |
virtual int | getLineNumber () const =0 |
virtual int | getColumnNumber () const =0 |
virtual PrefixStack * | prefixStack () const =0 |
virtual NodeType | nodeType () const =0 |
virtual const char * | nodeName () const =0 |
virtual const char * | nodeLocalName () const =0 |
virtual const char * | nodePrefix () const =0 |
virtual int | nodeNamespaceId () const =0 |
virtual const char * | nodeNamespaceUri () const =0 |
virtual const char * | nodeBaseUri () const =0 |
virtual bool | nodeHasValue () const =0 |
Return true if the current node has a value and false otherwise. | |
virtual const char * | nodeValue () const =0 |
virtual int | nodeDepth () const =0 |
virtual int | numAttributes () const =0 |
virtual bool | isEmptyElement () const =0 |
virtual unsigned int | options () const =0 |
Return the option flags. | |
Static Public Member Functions | |
static const char * | nodeTypeAsString (NodeType nodeType) |
This abstract class defines an interface for fast, forward-only access to XML data. An object belonging to a derived-class implementation of this protocol is required to be re-usable, such that a new XML document can be parsed using the same reader object by calling close
followed by another open
.
See balxml_reader
typedef bslma::ManagedPtr<bsl::streambuf> balxml::Reader::StreamBufPtr |
typedef bsl::function<StreamBufPtr(const char *location, const char *namespaceUri)> balxml::Reader::XmlResolverFunctor |
Type for a user supplied functor that finds and opens an external resource for the specified location
and/or namespaceUri
and returns that resource as a managed pointer to a stream. The location
argument specifies the location of the external resource and is typically a filename or a URI, depending on the context. The namespaceUri
argument always refers to the XML namespace of the entity to be resolved. A conforming functor returns an empty managed pointer if it cannot resolve the resource. For example, the reader may use a resolver to open an external entity, even if the reader does not do validation (see definition of <!ENTITY>
in the XML standard). Note that either argument can be NULL in situations where its value is not needed or can be computed from the other argument.
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virtual |
Destroy this object. The implementation for this pure abstract base class does nothing.
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pure virtual |
Move to the next node in the data steam created by open
thus allowing the node's properties to be queried via the Reader
accessors. Return 0 on successful read, 1 if there are no more nodes to read, and a negative number otherwise. Note that each call to advanceToNextNode
invalidates strings and data structures returned when Reader
accessors where call for the "prior node". E.g., the pointer returned from nodeName
for this node will not be valid once advanceToNextNode
is called. Note that the reader will not be on a valid node until the first call to advanceToNextNode
after the reader is opened. TBD: add comment about insignificant white space.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Close the reader. Most, but not all state is reset. Specifically, the XML resource resolver and the prefix stack remain. The prefix stack shall be returned to the stack depth it had when setPrefixStack
was called. Call the method open
to reuse the reader. Note that close
invalidates all strings and data structures obtained via Reader
accessors. E.g., the pointer returned from nodeName
for this node will not be valid once close
is called.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the document encoding or NULL on error. The returned pointer is owned by this object and must not be modified or deallocated by the caller. The returned pointer becomes invalid when close
is called or the reader is destroyed.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
void balxml::Reader::dumpNode | ( | bsl::ostream & | os | ) | const |
Print the information about the current node to the specified output os
stream.
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pure virtual |
Return a reference to the non-modifiable error information for this reader. The returned value becomes invalid when close
is called or the reader is destroyed.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the current column number within the input stream. The current column number is the number of characters since the last newline was read by the reader plus one, i.e., the first column of each line is column number one. Return 0 if not available. Note that a derived-class implementation is not required to count columns and may just return 0.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the current line number within the input stream. The current line is the last line for which the reader has not yet seen a newline. Lines are counted starting at one from the time a stream is provided to open
. Return 0 if not available. Note that a derived-class implementation is not required to count lines and may just return 0.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return true if the current node is an element (i.e., node type is BAEXML_NODE_TYPE_ELEMENT
) that ends with />
; and false otherwise. Note that <a/>
will be considered empty but <a></a>
will not.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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inline |
Return true
if the derived object encountered a error. This method is equivalent to a call to errorInfo().isError();
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inline |
Return true
if the derived object encountered a fatal error. This method is equivalent to a call to errorInfo().isFatalError();
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pure virtual |
Return true if open
was called successfully and close
has not yet been called and false otherwise.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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inline |
Return true
if the derived object encountered a warning. This method is equivalent to a call to errorInfo().isWarning();
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pure virtual |
Find the attribute with the specified localName
and specified namespaceUri
in the current node, and fill in the specified attribute
structure. Return 0 on success, 1 if there is no attribute found with localName
and namespaceUri
, and a negative value otherwise. If namespaceUri
== 0 or a blank string is passed, then the document's default namespace will be used. The strings that were filled into the attribute
structure are invalid upon the next advanceToNextNode
or close
is called.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Find the attribute with the specified localName
and specified namespaceId
in the current node, and fill in the specified attribute
structure. Return 0 on success, 1 if there is no attribute found with localName
and namespaceId
, and a negative value otherwise. If namespaceId
== -1, then the document's default namespace will be used. The strings that were filled into the attribute
structure are invalid upon the next advanceToNextNode
or close
is called.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Find the attribute with the specified qname
(qualified name) in the current node, and fill in the specified attribute
structure. Return 0 on success, 1 if there is no attribute found with qname
, and a negative value otherwise. The strings that were filled into the attribute
structure are invalid upon the next advanceToNextNode
or close
is called.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Find the attribute at the specified index
in the current node, and fill in the specified attribute
structure. Return 0 on success, 1 if no attribute is found at the index
, and an a negative value otherwise. The strings that were filled into the attribute
structure are invalid upon the next advanceToNextNode
or close
is called.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the base URI name of the current node if the current node has a base URI and NULL otherwise. The returned pointer is owned by this object and must not be modified or deallocated by the caller. The returned pointer becomes invalid upon the next advanceToNextNode
, when close
is called or the reader is destroyed.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the nesting depth of the current node in the XML document. The root node has depth 0.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the local name of the current node if the current node has a local name and NULL otherwise. The returned pointer is owned by this object and must not be modified or deallocated by the caller. The returned pointer becomes invalid upon the next advanceToNextNode
, when close
is called or the reader is destroyed.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the qualified name of the current node if the current node has a name and NULL otherwise. The returned pointer is owned by this object and must not be modified or deallocated by the caller. The returned pointer becomes invalid upon the next advanceToNextNode
, when close
is called or the reader is destroyed.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the namespace ID of the current node if the current node has a namespace id and a negative number otherwise.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the namespace URI name of the current node if the current node has a namespace URI and NULL otherwise. The returned pointer is owned by this object and must not be modified or deallocated by the caller. The returned pointer becomes invalid upon the next advanceToNextNode
, when close
is called or the reader is destroyed.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the prefix name of the current node if the correct node has a prefix name and NULL otherwise. The returned pointer is owned by this object and must not be modified or deallocated by the caller. The returned pointer becomes invalid upon the next advanceToNextNode
, when close
is called or the reader is destroyed.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the node type of the current node if the reader isOpen
and has not encounter an error and Reader::NONE
otherwise.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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static |
Return a string representation for the specified nodeType
code or "(* UNKNOWN NODE TYPE *)" if nodeType
is not one of the values enumerated in NodeType
.
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pure virtual |
Return the value of the current node if the current node has a value and NULL otherwise. The returned pointer is owned by this object and must not be modified or deallocated by the caller. The returned pointer becomes invalid upon the next advanceToNextNode
, when close
is called or the reader is destroyed.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return the number of attributes for the current node if that node has attributes and 0 otherwise.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Set up the reader for parsing using the data contained in the specified (XML) stream
, set the base URL to the optionally specified url
and set the encoding value to the optionally specified encoding
("ASCII", "UTF-8", etc). Return 0 on success and non-zero otherwise. If url
is null or a blank string is passed, then base URL will be empty. The encoding passed to Reader::open
will take effect only when there is no encoding information in the original document, i.e., the encoding information obtained from the (XML) stream
trumps all. If there is no encoding provided within the document and encoding
is null or a blank string is passed, then set the encoding to the default "UTF-8". It is an error to open
a reader that is already open. Note that the reader will not be on a valid node until advanceToNextNode
is called.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Set up the reader for parsing using the data contained in the specified (XML) buffer
of the specified size
, set the base URL to the optionally specified url
and set the encoding value to the optionally specified encoding
("ASCII", "UTF-8", etc). Return 0 on success and non-zero otherwise. If url
is null or a blank string is passed, then base URL will be empty. The encoding passed to Reader::open
will take effect only when there is no encoding information in the original document, i.e., the encoding information obtained from the (XML) buffer
trumps all. If there is no encoding provided within the document and encoding
is null or a blank string is passed, then set the encoding to the default "UTF-8". It is an error to open
a reader that is already open. Note that the reader will not be on a valid node until advanceToNextNode
is called.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Set up the reader for parsing using the data contained in the XML file described by the specified filename
, and set the encoding value to the optionally specified encoding
("ASCII", "UTF-8", etc). Returns 0 on success and non-zero otherwise. The encoding passed to Reader::open
will take effect only when there is no encoding information in the original document, i.e., the encoding information obtained from the XML file described by the filename
trumps all. If there is no encoding provided within the document and encoding
is null or a blank string is passed, then set the encoding to the default "UTF-8". It is an error to open
a reader that is already open. Note that the reader will not be on a valid node until advanceToNextNode
is called.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Return a pointer to the modifiable prefix stack that is used by this reader to manage namespace prefixes or 0 if namespace support is disabled. The behavior is undefined if the returned prefix stack is augmented in any way after calling open
and before calling close
.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Set the options to the flags in the specified flags
. The options for the reader are persistent, i.e., the options are not reset by close
. The behavior is undefined if this method is called after calling open
and before calling close
; except that derived classes are permitted to specify valid behavior for calling this function for specific arguments while the reader is open.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Set the prefix stack to the stack at the optionally specified prefixes
address or disable prefix stack support if prefixes
is null. This stack is used to push and pop namespace prefixes as the parse progresses, so that, at any point, the stack will reflect the set of active prefixes for the current node. It is legitimate to pass a stack that already contains prefixes, these prefixes shall be preserved when close
is called, i.e., the prefix stack shall be returned to the stack depth it had when setPrefixStack
was called. The behavior is undefined if this method is called after calling open
and before calling close
.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.
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pure virtual |
Set the external XML resource resolver to the specified resolver
. The XML resource resolver is used by the balxml_reader to find and open an external resources (See the XmlResolverFunctor
typedef for more details). The XML resource resolver remains valid; it is not affected by a call to close
and should be available until the reader is destroyed. The behavior is undefined if this method is called after calling open
and before calling close
.
Implemented in balxml::MiniReader, and balxml::Utf8ReaderWrapper.