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206 lines
8.3 KiB
C++
206 lines
8.3 KiB
C++
//
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// XMLReader.h
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//
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// Library: XML
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// Package: SAX
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// Module: SAX
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//
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// SAX2 XMLReader Interface.
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//
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// Copyright (c) 2004-2006, Applied Informatics Software Engineering GmbH.
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// and Contributors.
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//
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// SPDX-License-Identifier: BSL-1.0
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//
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#ifndef SAX_XMLReader_INCLUDED
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#define SAX_XMLReader_INCLUDED
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#include "Poco/XML/XML.h"
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#include "Poco/XML/XMLString.h"
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namespace Poco {
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namespace XML {
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class EntityResolver;
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class DTDHandler;
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class ContentHandler;
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class ErrorHandler;
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class InputSource;
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class LexicalHandler;
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class NamespaceHandler;
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class XML_API XMLReader
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/// Interface for reading an XML document using callbacks.
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/// XMLReader is the interface that an XML parser's SAX2 driver must
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/// implement. This interface allows an application to set and
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/// query features and properties in the parser, to register event handlers
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/// for document processing, and to initiate a document parse.
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/// All SAX interfaces are assumed to be synchronous: the parse methods must not
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/// return until parsing is complete, and readers
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/// must wait for an event-handler callback to return before reporting the next event.
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{
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public:
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virtual void setEntityResolver(EntityResolver* pResolver) = 0;
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/// Allow an application to register an entity resolver.
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///
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/// If the application does not register an entity resolver, the
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/// XMLReader will perform its own default resolution.
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///
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/// Applications may register a new or different resolver in the middle of a
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/// parse, and the SAX parser must begin using the new resolver immediately.
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virtual EntityResolver* getEntityResolver() const = 0;
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/// Return the current entity resolver.
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virtual void setDTDHandler(DTDHandler* pDTDHandler) = 0;
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/// Allow an application to register a DTD event handler.
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///
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/// If the application does not register a DTD handler, all DTD events reported by
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/// the SAX parser will be silently ignored.
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///
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/// Applications may register a new or different handler in the middle of a parse,
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/// and the SAX parser must begin using the new handler immediately.
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virtual DTDHandler* getDTDHandler() const = 0;
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/// Return the current DTD handler.
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virtual void setContentHandler(ContentHandler* pContentHandler) = 0;
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/// Allow an application to register a content event handler.
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///
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/// If the application does not register a content handler, all content events
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/// reported by the SAX parser will be silently ignored.
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///
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/// Applications may register a new or different handler in the middle of a parse,
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/// and the SAX parser must begin using the new handler immediately.
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virtual ContentHandler* getContentHandler() const = 0;
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/// Return the current content handler.
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virtual void setErrorHandler(ErrorHandler* pErrorHandler) = 0;
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/// Allow an application to register an error event handler.
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///
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/// If the application does not register an error handler, all error events reported by
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/// the SAX parser will be silently ignored; however, normal processing may not continue.
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/// It is highly recommended that all SAX applications implement an error handler to avoid
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/// unexpected bugs.
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///
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/// Applications may register a new or different handler in the middle of a parse, and the
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/// SAX parser must begin using the new handler immediately.
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virtual ErrorHandler* getErrorHandler() const = 0;
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/// Return the current error handler.
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virtual void setFeature(const XMLString& featureId, bool state) = 0;
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/// Set the state of a feature.
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///
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/// The feature name is any fully-qualified URI. It is possible for an XMLReader to
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/// expose a feature value but to be unable to change the current value. Some feature
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/// values may be immutable or mutable only in specific contexts, such as before, during,
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/// or after a parse.
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///
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/// All XMLReaders are required to support setting http://xml.org/sax/features/namespaces
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/// to true and http://xml.org/sax/features/namespace-prefixes to false.
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virtual bool getFeature(const XMLString& featureId) const = 0;
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/// Look up the value of a feature.
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///
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/// The feature name is any fully-qualified URI. It is possible for an XMLReader
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/// to recognize a feature name but temporarily be unable to return its value.
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/// Some feature values may be available only in specific contexts, such as before,
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/// during, or after a parse. Also, some feature values may not be programmatically
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/// accessible. (In the case of an adapter for SAX1 Parser, there is no
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/// implementation-independent way to expose whether the underlying parser is performing
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/// validation, expanding external entities, and so forth.)
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///
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/// All XMLReaders are required to recognize the
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/// http://xml.org/sax/features/namespaces and the
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/// http://xml.org/sax/features/namespace-prefixes feature names.
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/// Implementors are free (and encouraged) to invent their own features,
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/// using names built on their own URIs.
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virtual void setProperty(const XMLString& propertyId, const XMLString& value) = 0;
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/// Set the value of a property.
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///
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/// The property name is any fully-qualified URI. It is possible for an XMLReader
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/// to recognize a property name but to be unable to change the current value.
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/// Some property values may be immutable or mutable only in specific contexts,
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/// such as before, during, or after a parse.
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///
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/// XMLReaders are not required to recognize setting any specific property names, though a
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/// core set is defined by SAX2.
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///
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/// This method is also the standard mechanism for setting extended handlers.
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virtual void setProperty(const XMLString& propertyId, void* value) = 0;
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/// Set the value of a property.
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/// See also setProperty(const XMLString&, const XMLString&).
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virtual void* getProperty(const XMLString& propertyId) const = 0;
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/// Look up the value of a property.
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/// String values are returned as XMLChar*
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/// The property name is any fully-qualified URI. It is possible for an XMLReader to
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/// recognize a property name but temporarily be unable to return its value. Some property
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/// values may be available only in specific contexts, such as before, during, or after a parse.
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///
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/// XMLReaders are not required to recognize any specific property names, though an initial
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/// core set is documented for SAX2.
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///
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/// Implementors are free (and encouraged) to invent their own properties, using names
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/// built on their own URIs.
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virtual void parse(InputSource* pSource) = 0;
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/// Parse an XML document.
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///
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/// The application can use this method to instruct the XML reader to begin parsing an
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/// XML document from any valid input source (a character stream, a byte stream, or a URI).
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///
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/// Applications may not invoke this method while a parse is in progress (they should create
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/// a new XMLReader instead for each nested XML document). Once a parse is complete, an
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/// application may reuse the same XMLReader object, possibly with a different input source.
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/// Configuration of the XMLReader object (such as handler bindings and values established for
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/// feature flags and properties) is unchanged by completion of a parse, unless the definition of that
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/// aspect of the configuration explicitly specifies other behavior. (For example, feature flags or
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/// properties exposing characteristics of the document being parsed.)
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///
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/// During the parse, the XMLReader will provide information about the XML document through the registered
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/// event handlers.
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///
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/// This method is synchronous: it will not return until parsing has ended. If a client application
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/// wants to terminate parsing early, it should throw an exception.
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virtual void parse(const XMLString& systemId) = 0;
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/// Parse an XML document from a system identifier.
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/// See also parse(InputSource*).
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virtual void parseMemoryNP(const char* xml, std::size_t size) = 0;
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/// Parse an XML document from memory.
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/// See also parse(InputSource*).
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// SAX Features
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static const XMLString FEATURE_VALIDATION;
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static const XMLString FEATURE_NAMESPACES;
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static const XMLString FEATURE_NAMESPACE_PREFIXES;
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static const XMLString FEATURE_EXTERNAL_GENERAL_ENTITIES;
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static const XMLString FEATURE_EXTERNAL_PARAMETER_ENTITIES;
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static const XMLString FEATURE_STRING_INTERNING;
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// SAX Properties
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static const XMLString PROPERTY_DECLARATION_HANDLER;
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static const XMLString PROPERTY_LEXICAL_HANDLER;
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protected:
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virtual ~XMLReader();
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};
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} } // namespace Poco::XML
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#endif // SAX_XMLReader_INCLUDED
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