generalize ImportFilterBase a bit more

Currently there is a nearly exact copy of that class for every ODF
document type. That suggests that it might be a good idea to use a
template :-)

Change-Id: I2a24eb5bd63cc584569a948df63266c7eb703bd3

writerperfect/inc/writerperfect/DocumentHandlerFor.hxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_WRITERPERFECT_INC_WRITERPERFECT_DOCUMENTHANDLERFOR_HXX
+#define INCLUDED_WRITERPERFECT_INC_WRITERPERFECT_DOCUMENTHANDLERFOR_HXX
+
+namespace writerperfect
+{
+
+/** Definition of XML import service used with a Generator.
+
+    This template must be specialized for every libodfgen generator.
+  */
+template<class Generator>
+struct DocumentHandlerFor
+{
+    // static const rtl::OUString name();
+};
+
+}
+
+#endif // INCLUDED_WRITERPERFECT_INC_WRITERPERFECT_DOCUMENTHANDLERFOR_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */

writerperfect/inc/writerperfect/ImportFilter.hxx

+/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
+/*
+ * This Source Code Form is subject to the terms of the Mozilla Public
+ * License, v. 2.0. If a copy of the MPL was not distributed with this
+ * file, You can obtain one at http://mozilla.org/MPL/2.0/.
+ */
+
+#ifndef INCLUDED_WRITERPERFECT_INC_WRITERPERFECT_IMPORTFILTER_HXX
+#define INCLUDED_WRITERPERFECT_INC_WRITERPERFECT_IMPORTFILTER_HXX
+
+#include <libodfgen/libodfgen.hxx>
+
+#include <librevenge/librevenge.h>
+
+#include <librevenge-stream/librevenge-stream.h>
+
+#include <com/sun/star/beans/PropertyValue.hpp>
+#include <com/sun/star/document/XExtendedFilterDetection.hpp>
+#include <com/sun/star/document/XFilter.hpp>
+#include <com/sun/star/document/XImporter.hpp>
+#include <com/sun/star/io/XInputStream.hpp>
+#include <com/sun/star/io/XSeekable.hpp>
+#include <com/sun/star/lang/XInitialization.hpp>
+#include <com/sun/star/lang/XServiceInfo.hpp>
+#include <com/sun/star/uno/Reference.h>
+#include <com/sun/star/uno/XComponentContext.hpp>
+#include <com/sun/star/xml/sax/InputSource.hpp>
+#include <com/sun/star/xml/sax/XDocumentHandler.hpp>
+
+#include <cppuhelper/implbase1.hxx>
+#include <cppuhelper/implbase4.hxx>
+
+#include <unotools/mediadescriptor.hxx>
+
+#include <writerperfect/DocumentHandler.hxx>
+#include <writerperfect/WPXSvInputStream.hxx>
+
+#include <xmloff/attrlist.hxx>
+
+#include "writerperfect/DocumentHandlerFor.hxx"
+
+namespace writerperfect
+{
+
+namespace detail
+{
+
+template<class Generator>
+class ImportFilterImpl : public cppu::WeakImplHelper4
+    <
+    com::sun::star::document::XFilter,
+    com::sun::star::document::XImporter,
+    com::sun::star::document::XExtendedFilterDetection,
+    com::sun::star::lang::XInitialization
+    >
+{
+public:
+    ImportFilterImpl(const ::com::sun::star::uno::Reference< ::com::sun::star::uno::XComponentContext > &rxContext)
+        : mxContext(rxContext)
+    {
+    }
+
+    virtual ~ImportFilterImpl()
+    {
+    }
+
+    // XFilter
+    virtual sal_Bool SAL_CALL filter(const ::com::sun::star::uno::Sequence< ::com::sun::star::beans::PropertyValue > &rDescriptor)
+    throw (::com::sun::star::uno::RuntimeException, std::exception) SAL_OVERRIDE
+    {
+        sal_Int32 nLength = rDescriptor.getLength();
+        const css::beans::PropertyValue *pValue = rDescriptor.getConstArray();
+        css::uno::Reference < css::io::XInputStream > xInputStream;
+        for (sal_Int32 i = 0 ; i < nLength; i++)
+        {
+            if (pValue[i].Name == "InputStream")
+                pValue[i].Value >>= xInputStream;
+        }
+        if (!xInputStream.is())
+        {
+            OSL_ASSERT(false);
+            return sal_False;
+        }
+
+        // An XML import service: what we push sax messages to..
+        css::uno::Reference < css::xml::sax::XDocumentHandler > xInternalHandler(
+            mxContext->getServiceManager()->createInstanceWithContext(
+                DocumentHandlerFor<Generator>::name(), mxContext),
+            css::uno::UNO_QUERY_THROW);
+
+        // The XImporter sets up an empty target document for XDocumentHandler to write to..
+        css::uno::Reference < css::document::XImporter > xImporter(xInternalHandler, css::uno::UNO_QUERY);
+        xImporter->setTargetDocument(mxDoc);
+
+        // OO Graphics Handler: abstract class to handle document SAX messages, concrete implementation here
+        // writes to in-memory target doc
+        DocumentHandler xHandler(xInternalHandler);
+
+        WPXSvInputStream input(xInputStream);
+
+        Generator exporter;
+        exporter.addDocumentHandler(&xHandler, ODF_FLAT_XML);
+
+        this->doRegisterHandlers(exporter);
+
+        utl::MediaDescriptor aDescriptor(rDescriptor);
+        return this->doImportDocument(input, exporter, aDescriptor);
+    }
+
+    virtual void SAL_CALL cancel()
+    throw (::com::sun::star::uno::RuntimeException, std::exception) SAL_OVERRIDE
+    {
+    }
+
+    // XImporter
+    virtual void SAL_CALL setTargetDocument(const ::com::sun::star::uno::Reference< ::com::sun::star::lang::XComponent > &xDoc)
+    throw (::com::sun::star::lang::IllegalArgumentException, ::com::sun::star::uno::RuntimeException, std::exception) SAL_OVERRIDE
+    {
+        mxDoc = xDoc;
+    }
+
+    //XExtendedFilterDetection
+    virtual OUString SAL_CALL detect(com::sun::star::uno::Sequence< com::sun::star::beans::PropertyValue > &Descriptor)
+    throw(com::sun::star::uno::RuntimeException, std::exception) SAL_OVERRIDE
+    {
+        OUString sTypeName;
+        sal_Int32 nLength = Descriptor.getLength();
+        sal_Int32 location = nLength;
+        const css::beans::PropertyValue *pValue = Descriptor.getConstArray();
+        css::uno::Reference < css::io::XInputStream > xInputStream;
+        for (sal_Int32 i = 0 ; i < nLength; i++)
+        {
+            if (pValue[i].Name == "TypeName")
+                location=i;
+            else if (pValue[i].Name == "InputStream")
+                pValue[i].Value >>= xInputStream;
+        }
+
+        if (!xInputStream.is())
+            return OUString();
+
+        WPXSvInputStream input(xInputStream);
+
+        if (this->doDetectFormat(input, sTypeName))
+        {
+            assert(!sTypeName.isEmpty());
+
+            if (location == nLength)
+            {
+                Descriptor.realloc(nLength+1);
+                Descriptor[location].Name = "TypeName";
+            }
+
+            Descriptor[location].Value <<=sTypeName;
+        }
+
+        return sTypeName;
+    }
+
+    // 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, std::exception) SAL_OVERRIDE
+    {
+        css::uno::Sequence < css::beans::PropertyValue > aAnySeq;
+        sal_Int32 nLength = aArguments.getLength();
+        if (nLength && (aArguments[0] >>= aAnySeq))
+        {
+            const css::beans::PropertyValue *pValue = aAnySeq.getConstArray();
+            nLength = aAnySeq.getLength();
+            for (sal_Int32 i = 0 ; i < nLength; i++)
+            {
+                if (pValue[i].Name == "Type")
+                {
+                    pValue[i].Value >>= msFilterName;
+                    break;
+                }
+            }
+        }
+    }
+
+private:
+    virtual bool doDetectFormat(librevenge::RVNGInputStream &rInput, OUString &rTypeName) = 0;
+    virtual bool doImportDocument(librevenge::RVNGInputStream &rInput, Generator &rGenerator, utl::MediaDescriptor &rDescriptor) = 0;
+    virtual void doRegisterHandlers(Generator &)
+    {
+    }
+
+private:
+    ::com::sun::star::uno::Reference< ::com::sun::star::uno::XComponentContext > mxContext;
+    ::com::sun::star::uno::Reference< ::com::sun::star::lang::XComponent > mxDoc;
+    OUString msFilterName;
+    ::com::sun::star::uno::Reference< ::com::sun::star::xml::sax::XDocumentHandler > mxHandler;
+};
+
+}
+
+/** A base class for import filters.
+ */
+template<class Generator>
+struct ImportFilter : public cppu::ImplInheritanceHelper1<detail::ImportFilterImpl<Generator>, com::sun::star::lang::XServiceInfo>
+{
+    ImportFilter(const css::uno::Reference<css::uno::XComponentContext> &rxContext)
+        : cppu::ImplInheritanceHelper1<detail::ImportFilterImpl<Generator>, com::sun::star::lang::XServiceInfo>(rxContext)
+    {
+    }
+};
+
+}
+
+#endif // INCLUDED_WRITERPERFECT_INC_WRITERPERFECT_IMPORTFILTER_HXX
+
+/* vim:set shiftwidth=4 softtabstop=4 expandtab: */