xref: /trunk/main/xmlsecurity/source/framework/saxeventkeeperimpl.hxx (revision ec61c6ed)

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 *
 * Licensed to the Apache Software Foundation (ASF) under one
 * or more contributor license agreements.  See the NOTICE file
 * distributed with this work for additional information
 * regarding copyright ownership.  The ASF licenses this file
 * to you under the Apache License, Version 2.0 (the
 * "License"); you may not use this file except in compliance
 * with the License.  You may obtain a copy of the License at
 *
 *   http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
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 *
 *************************************************************/



#ifndef _SAXEVENTKEEPERIMPL_HXX
#define _SAXEVENTKEEPERIMPL_HXX

#include <com/sun/star/xml/crypto/sax/XSecuritySAXEventKeeper.hpp>
#include <com/sun/star/xml/crypto/sax/XReferenceResolvedBroadcaster.hpp>
#include <com/sun/star/xml/crypto/sax/XSAXEventKeeperStatusChangeBroadcaster.hpp>
#include <com/sun/star/xml/crypto/sax/XSAXEventKeeperStatusChangeListener.hpp>
#include <com/sun/star/xml/csax/XCompressedDocumentHandler.hpp>
#include <com/sun/star/xml/wrapper/XXMLDocumentWrapper.hpp>
#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
#include <com/sun/star/lang/XInitialization.hpp>
#include <com/sun/star/lang/XServiceInfo.hpp>
#include <cppuhelper/implbase6.hxx>

#include "buffernode.hxx"
#include "elementmark.hxx"
#include "elementcollector.hxx"

#ifndef INCLUDED_VECTOR
#include <vector>
#define INCLUDED_VECTOR
#endif

class SAXEventKeeperImpl : public cppu::WeakImplHelper6
<
	com::sun::star::xml::crypto::sax::XSecuritySAXEventKeeper,
	com::sun::star::xml::crypto::sax::XReferenceResolvedBroadcaster,
	com::sun::star::xml::crypto::sax::XSAXEventKeeperStatusChangeBroadcaster,
	com::sun::star::xml::sax::XDocumentHandler,
	com::sun::star::lang::XInitialization,
	com::sun::star::lang::XServiceInfo
>
/****** SAXEventKeeperImpl.hxx/CLASS SAXEventKeeperImpl ***********************
 *
 *   NAME
 *	SAXEventKeeperImpl -- SAX events buffer controller
 *
 *   FUNCTION
 *	Controls SAX events to be bufferred, and controls bufferred SAX events
 *	to be released.
 *
 *   HISTORY
 *	05.01.2004 -	Interface supported: XSecuritySAXEventKeeper,
 *	            	XReferenceResolvedBroadcaster,
 *	            	XSAXEventKeeperStatusChangeBroadcaster,
 *	            	XDocumentHandler, XInitialization, XServiceInfo
 *
 *   AUTHOR
 *	Michael Mi
 *	Email: michael.mi@sun.com
 ******************************************************************************/
{
private:
	/*
	 * the XMLDocumentWrapper component which maintains all bufferred SAX
	 * in DOM format.
	 */
	com::sun::star::uno::Reference<
		com::sun::star::xml::wrapper::XXMLDocumentWrapper >
		m_xXMLDocument;

	/*
	 * the document handler provided by the XMLDocumentWrapper component.
	 */
	com::sun::star::uno::Reference<
		com::sun::star::xml::sax::XDocumentHandler > m_xDocumentHandler;

	/*
	 * the compressed document handler provided by the XMLDocumentWrapper
	 * component, the handler has more effient method definition that the
	 * normal document handler.
	 */
	com::sun::star::uno::Reference<
		com::sun::star::xml::csax::XCompressedDocumentHandler >
		m_xCompressedDocumentHandler;

	/*
	 * a listener which receives this SAXEventKeeper's status change
	 * notification.
	 * Based on the status changes, the listener can decide whether the
	 * SAXEventKeeper should chain on/chain off the SAX chain, or whether
	 * the SAXEventKeeper is useless any long.
	 */
	com::sun::star::uno::Reference<
		com::sun::star::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >
		m_xSAXEventKeeperStatusChangeListener;

	/*
	 * the root node of the BufferNode tree.
	 * the BufferNode tree is used to keep track of all bufferred elements,
	 * it has the same structure with the document which maintains those
	 * elements physically.
	 */
	BufferNode*  m_pRootBufferNode;

	/*
	 * the current active BufferNode.
	 * this is used to keep track the current location in the BufferNode tree,
	 * the next generated BufferNode will become a child BufferNode of it.
	 */
	BufferNode*  m_pCurrentBufferNode;

	/*
	 * the next Id for a coming ElementMark.
	 * the variable is increased by 1 when an new ElementMark is generated,
	 * in this way, we can promise the Id of any ElementMark is unique.
	 */
	sal_Int32    m_nNextElementMarkId;

	/*
	 * maintains a collection of all ElementMarks.
	 */
	std::vector< const ElementMark* > m_vElementMarkBuffers;

	/*
	 * maintains a list of new ElementCollectors that will be created
	 * on the element represented by the next incoming startElement SAX
	 * event.
	 * The reason that such the m_vNewElementCollectors is necessary
	 * is: when an ElementCollector is asked to create, it can't be
	 * created completely at once, because the BufferNode it will be
	 * working on has not been created until the next startElement
	 * SAX event comes.
	 */
	std::vector< const ElementCollector* > m_vNewElementCollectors;

	/*
	 * maintains the new Blocker that will be created
	 * on the element represented by the next incoming startElement SAX
	 * event.
	 */
	ElementMark* m_pNewBlocker;

	/*
	 * the document handler to which all received SAX events will be
	 * forwarded.
	 */
	com::sun::star::uno::Reference<
		com::sun::star::xml::sax::XDocumentHandler > m_xNextHandler;

	/*
	 * the current BufferNode which prevents the SAX events to be
	 * forwarded to the m_xNextHandler.
	 */
	BufferNode*  m_pCurrentBlockingBufferNode;

	/*
	 * maintains a list of ElementMark that has been asked to release.
	 * Because during processing a request of releasing an ElementMark,
	 * another releasing ElementMark request can be invoked. To avoid
	 * reentering the same method, a such request only add that ElementMark
	 * into this ElementMark list, then all ElementMarks will be processed in
	 * order.
	 */
	std::vector< sal_Int32 > m_vReleasedElementMarkBuffers;

	/*
	 * a flag to indicate whether the ElementMark releasing process is runing.
	 * When a releasing request comes, the assigned ElementMark is added to
	 * the m_vReleasedElementMarkBuffers first, then this flag is checked.
	 * If the ElementMark releasing process is not running, then call that
	 * method.
	 */
	bool     m_bIsReleasing;

	/*
	 * a flag to indicate whether it is the "Forwarding" mode now.
	 * A "Forwarding" mode means that all received SAX events are from the
	 * XMLDocumentWrapper component, instead of up-stream component in the
	 * SAX chain.
	 * The difference between "Forwarding" mode and normal mode is that:
	 * no SAX events need to be transferred to the XMLDocumentWrapper component
	 * again even if a buffer request happens.
	 */
	bool     m_bIsForwarding;

	void setCurrentBufferNode(BufferNode* pBufferNode);

	BufferNode* addNewElementMarkBuffers();

	ElementMark* findElementMarkBuffer(sal_Int32 nId) const;

	void removeElementMarkBuffer(sal_Int32 nId);

	rtl::OUString printBufferNode(
		BufferNode* pBufferNode, sal_Int32 nIndent) const;

	com::sun::star::uno::Sequence< com::sun::star::uno::Reference<
		com::sun::star::xml::wrapper::XXMLElementWrapper > >
		collectChildWorkingElement(BufferNode* pBufferNode) const;

	void smashBufferNode(
		BufferNode* pBufferNode, bool bClearRoot) const;

	BufferNode* findNextBlockingBufferNode(
		BufferNode* pStartBufferNode) const;

	void diffuse(BufferNode* pBufferNode) const;

	void releaseElementMarkBuffer();

	void markElementMarkBuffer(sal_Int32 nId);

	sal_Int32 createElementCollector(
		sal_Int32 nSecurityId,
		com::sun::star::xml::crypto::sax::ElementMarkPriority nPriority,
		bool bModifyElement,
		const com::sun::star::uno::Reference<
			com::sun::star::xml::crypto::sax::XReferenceResolvedListener>&
			xReferenceResolvedListener);

	sal_Int32 createBlocker(sal_Int32 nSecurityId);

public:
	SAXEventKeeperImpl();
	virtual ~SAXEventKeeperImpl();

	/* XSAXEventKeeper */
	virtual sal_Int32 SAL_CALL addElementCollector(  )
		throw (com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL removeElementCollector( sal_Int32 id )
		throw (com::sun::star::uno::RuntimeException);
	virtual sal_Int32 SAL_CALL addBlocker(  )
		throw (com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL removeBlocker( sal_Int32 id )
		throw (com::sun::star::uno::RuntimeException);
	virtual sal_Bool SAL_CALL isBlocking(  )
		throw (com::sun::star::uno::RuntimeException);
	virtual com::sun::star::uno::Reference<
		com::sun::star::xml::wrapper::XXMLElementWrapper > SAL_CALL
		getElement( sal_Int32 id )
		throw (com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL setElement(
		sal_Int32 id,
		const com::sun::star::uno::Reference<
			com::sun::star::xml::wrapper::XXMLElementWrapper >&
			aElement )
		throw (com::sun::star::uno::RuntimeException);
	virtual com::sun::star::uno::Reference<
		com::sun::star::xml::sax::XDocumentHandler > SAL_CALL
		setNextHandler( const com::sun::star::uno::Reference<
			com::sun::star::xml::sax::XDocumentHandler >& xNewHandler )
		throw (com::sun::star::uno::RuntimeException);
	virtual rtl::OUString SAL_CALL printBufferNodeTree()
		throw (com::sun::star::uno::RuntimeException);
	virtual com::sun::star::uno::Reference<
		com::sun::star::xml::wrapper::XXMLElementWrapper > SAL_CALL
		getCurrentBlockingNode()
		throw (com::sun::star::uno::RuntimeException);

	/* XSecuritySAXEventKeeper */
	virtual sal_Int32 SAL_CALL addSecurityElementCollector(
		com::sun::star::xml::crypto::sax::ElementMarkPriority priority,
		sal_Bool modifyElement )
		throw (com::sun::star::uno::RuntimeException);
	virtual sal_Int32 SAL_CALL cloneElementCollector(
		sal_Int32 referenceId,
		com::sun::star::xml::crypto::sax::ElementMarkPriority priority )
		throw (com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL setSecurityId( sal_Int32 id, sal_Int32 securityId )
		throw (com::sun::star::uno::RuntimeException);

	/* XReferenceResolvedBroadcaster */
	virtual void SAL_CALL addReferenceResolvedListener(
		sal_Int32 referenceId,
		const com::sun::star::uno::Reference<
			com::sun::star::xml::crypto::sax::XReferenceResolvedListener >&
			listener )
		throw (com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL removeReferenceResolvedListener(
		sal_Int32 referenceId,
		const com::sun::star::uno::Reference<
			com::sun::star::xml::crypto::sax::XReferenceResolvedListener >&
			listener )
		throw (com::sun::star::uno::RuntimeException);

	/* XSAXEventKeeperStatusChangeBroadcaster */
	virtual void SAL_CALL addSAXEventKeeperStatusChangeListener(
		const com::sun::star::uno::Reference<
			com::sun::star::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >&
			listener )
		throw (com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL removeSAXEventKeeperStatusChangeListener(
		const com::sun::star::uno::Reference<
			com::sun::star::xml::crypto::sax::XSAXEventKeeperStatusChangeListener >&
			listener )
		throw (com::sun::star::uno::RuntimeException);

	/* XDocumentHandler */
	virtual void SAL_CALL startDocument(  )
		throw (com::sun::star::xml::sax::SAXException, com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL endDocument(  )
		throw (com::sun::star::xml::sax::SAXException, com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL startElement(
		const rtl::OUString& aName,
		const com::sun::star::uno::Reference< com::sun::star::xml::sax::XAttributeList >&
		xAttribs )
		throw (com::sun::star::xml::sax::SAXException, com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL endElement( const rtl::OUString& aName )
		throw (com::sun::star::xml::sax::SAXException, com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL characters( const rtl::OUString& aChars )
		throw (com::sun::star::xml::sax::SAXException, com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL ignorableWhitespace( const rtl::OUString& aWhitespaces )
		throw (com::sun::star::xml::sax::SAXException, com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL processingInstruction(
		const rtl::OUString& aTarget, const rtl::OUString& aData )
		throw (com::sun::star::xml::sax::SAXException, com::sun::star::uno::RuntimeException);
	virtual void SAL_CALL setDocumentLocator(
		const com::sun::star::uno::Reference< com::sun::star::xml::sax::XLocator >& xLocator )
		throw (com::sun::star::xml::sax::SAXException, com::sun::star::uno::RuntimeException);

	/* XInitialization */
	virtual void SAL_CALL initialize(
		const com::sun::star::uno::Sequence< com::sun::star::uno::Any >& aArguments )
		throw (com::sun::star::uno::Exception, com::sun::star::uno::RuntimeException);

	/* XServiceInfo */
	virtual rtl::OUString SAL_CALL getImplementationName(  )
		throw (com::sun::star::uno::RuntimeException);
	virtual sal_Bool SAL_CALL supportsService( const rtl::OUString& ServiceName )
		throw (com::sun::star::uno::RuntimeException);
	virtual com::sun::star::uno::Sequence< rtl::OUString > SAL_CALL getSupportedServiceNames(  )
		throw (com::sun::star::uno::RuntimeException);
};

rtl::OUString SAXEventKeeperImpl_getImplementationName()
	throw ( com::sun::star::uno::RuntimeException );

sal_Bool SAL_CALL SAXEventKeeperImpl_supportsService( const rtl::OUString& ServiceName )
	throw ( com::sun::star::uno::RuntimeException );

com::sun::star::uno::Sequence< rtl::OUString > SAL_CALL SAXEventKeeperImpl_getSupportedServiceNames(  )
	throw ( com::sun::star::uno::RuntimeException );

com::sun::star::uno::Reference< com::sun::star::uno::XInterface >
SAL_CALL SAXEventKeeperImpl_createInstance( const com::sun::star::uno::Reference< com::sun::star::lang::XMultiServiceFactory > & rSMgr)
	throw ( com::sun::star::uno::Exception );

#endif