Examples of PostPreProcessFilterSplittingVisitor

org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor
Determines what queries can be processed server side and which can be processed client side. IMPLEMENTATION NOTE: This class is implemented as a stack processor. If you're curious how it works, compare it with the old SQLUnpacker class, which did the same thing using recursion in a more straightforward way. Here's a non-implementors best-guess at the algorithm: Starting at the top of the filter, split each filter into its constituent parts. If the given FilterCapabilities support the given operator, then keep checking downwards. The key is in knowing whether or not something "down the tree" from you wound up being supported or not. This is where the stacks come in. Right before handing off to accept() the sub- filters, we count how many things are currently on the "can be proccessed by the underlying datastore" stack (the preStack) and we count how many things are currently on the "need to be post- processed" stack. After the accept() call returns, we look again at the preStack.size() and postStack.size(). If the postStack has grown, that means that there was stuff down in the accept()-ed filter that wasn't supportable. Usually this means that our filter isn't supportable, but not always. In some cases a sub-filter being unsupported isn't necessarily bad, as we can 'unpack' OR statements into AND statements (DeMorgans rule/modus poens) and still see if we can handle the other side of the OR. Same with NOT and certain kinds of AND statements. In addition this class supports the case where we're doing an split in the middle of a client-side transaction. I.e. imagine doing a against a WFS-T where you have to filter against actions that happened previously in the transaction. That's what the ClientTransactionAccessor interface does, and this class splits filters while respecting the information about deletes and updates that have happened previously in the Transaction. I can't say with certainty exactly how the logic for that part of this works, but the test suite does seem to test it and the tests do pass. @author dzwiers @author commented and ported from gt to ogc filters by saul.farber @source $URL$ @deprecated use {@link CapabilitiesFilterSplitter} instead for geoapi FilterCapabilities

Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

            // first off, simplify the filter
            ArcSdeSimplifyingFilterVisitor visitor = new ArcSdeSimplifyingFilterVisitor(featureType);
            Filter simplified = (Filter) sourceFilter.accept(visitor, null);
            
            // then perform the splits
            PostPreProcessFilterSplittingVisitor unpacker = new PostPreProcessFilterSplittingVisitor(
                    sqlEncoder.getCapabilities(), featureType, null);
            simplified.accept(unpacker, null);


            SimplifyingFilterVisitor filterSimplifier = new SimplifyingFilterVisitor();
            final String typeName = this.featureType.getTypeName();
            FIDValidator validator = new SimplifyingFilterVisitor.TypeNameDotNumberFidValidator(
                    typeName);
            filterSimplifier.setFIDValidator(validator);


            this._sqlFilter = unpacker.getFilterPre();
            this._sqlFilter = (Filter) this._sqlFilter.accept(filterSimplifier, null);


            if (LOGGER.isLoggable(Level.FINE) && _sqlFilter != null)
                LOGGER.fine("SQL portion of SDE Query: '" + _sqlFilter + "'");


            Filter remainingFilter = unpacker.getFilterPost();


            unpacker = new PostPreProcessFilterSplittingVisitor(
                    GeometryEncoderSDE.getCapabilities(), featureType, null);
            remainingFilter.accept(unpacker, null);


            this.geometryFilter = unpacker.getFilterPre();
            this.geometryFilter = (Filter) this.geometryFilter.accept(filterSimplifier, null);
            if (LOGGER.isLoggable(Level.FINE) && geometryFilter != null)
                LOGGER.fine("Spatial-Filter portion of SDE Query: '" + geometryFilter + "'");


            this.unsupportedFilter = unpacker.getFilterPost();
            if (LOGGER.isLoggable(Level.FINE) && unsupportedFilter != null)
                LOGGER.fine("Unsupported (and therefore ignored) portion of SDE Query: '"
                        + unsupportedFilter + "'");
        }

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

    
    Filter[] splitFilter(Filter original) {
        Filter[] split = new Filter[2];
        if ( original != null ) {
            //create a filter splitter
            PostPreProcessFilterSplittingVisitor splitter = new PostPreProcessFilterSplittingVisitor(getDataStore()
                    .getFilterCapabilities(), null, null);
            original.accept(splitter, null);
        
            split[0] = splitter.getFilterPre();
            split[1] = splitter.getFilterPost();
        }
        
        SimplifyingFilterVisitor visitor = new SimplifyingFilterVisitor();
        visitor.setFIDValidator( new PrimaryKeyFIDValidator( this ) );
        split[0] = (Filter) split[0].accept(visitor, null);

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

    private Filter[] splitFilter(Filter original, FeatureSource source) {
        Filter[] split = new Filter[2];
        if (original != null) {
            SolrFeatureSource featureSource = (SolrFeatureSource) source;
            ;
            PostPreProcessFilterSplittingVisitor splitter = new PostPreProcessFilterSplittingVisitor(
                    getDataStore().getFilterCapabilities(), featureSource.getSchema(), null);
            original.accept(splitter, null);
            split[0] = splitter.getFilterPre();
            split[1] = splitter.getFilterPost();
        }
        return split;
    }

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

        WFSTransactionState state = (t == Transaction.AUTO_COMMIT) ? null : (WFSTransactionState) t
                .getState(this);
        WFSTransactionAccessor transactionAccessor = null;
        if (state != null)
            transactionAccessor = new WFSTransactionAccessor(state.getActions(ft.getTypeName()));
        PostPreProcessFilterSplittingVisitor wfsfv = new PostPreProcessFilterSplittingVisitor(
                capabilities.getFilterCapabilities(), ft, transactionAccessor);


        q.getFilter().accept(wfsfv, null);


        Filter[] f = new Filter[2];
        f[0] = wfsfv.getFilterPre(); // server
        f[1] = wfsfv.getFilterPost();


        return f;
    }

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

        if (filter == Filter.INCLUDE || filter == Filter.EXCLUDE) {
            return true;
        }


        // we can encode fully an attribute filter plus a bbox spatial filter
        PostPreProcessFilterSplittingVisitor visitor = new PostPreProcessFilterSplittingVisitor(
                ATTRIBUTE_FILTER_CAPABILITIES, schema, null);
        filter.accept(visitor, null);
        Filter postFilter = visitor.getFilterPost();
        return postFilter == Filter.INCLUDE || postFilter instanceof BBOX;
    }

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

     * @return
     */
    public Filter getPostFilter() {
        // see if the query has a single bbox filter (that's how much we're sure to be able to
        // encode)
        PostPreProcessFilterSplittingVisitor visitor = new PostPreProcessFilterSplittingVisitor(
                STRICT_GEOMETRY_FILTER_CAPABILITIES, schema, null);
        filter.accept(visitor, null);
        Filter preFilter = visitor.getFilterPre();


        if (preFilter == null || preFilter instanceof BBOX) {
            // ok, then we can extract using the extended caps
            visitor = new PostPreProcessFilterSplittingVisitor(EXTENDED_FILTER_CAPABILITIES,
                    schema, null);
            filter.accept(visitor, null);
            return visitor.getFilterPost();
        } else {
            // though luck, there is more than a single bbox filter
            visitor = new PostPreProcessFilterSplittingVisitor(ATTRIBUTE_FILTER_CAPABILITIES,
                    schema, null);
            filter.accept(visitor, null);
            return visitor.getFilterPost();
        }
    }

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

     * @param filter
     * @return
     */
    public Geometry getSpatialFilter() {
        // TODO: switch to the non deprecated splitter (that no one seems to be using)
        PostPreProcessFilterSplittingVisitor visitor = new PostPreProcessFilterSplittingVisitor(
                GEOMETRY_FILTER_CAPABILITIES, schema, null);
        filter.accept(visitor, null);
        Filter preFilter = visitor.getFilterPre();
        if (preFilter instanceof BinarySpatialOperator) {
            BinarySpatialOperator bso = ((BinarySpatialOperator) preFilter);
            Expression geomExpression = null;
            if (bso.getExpression1() instanceof PropertyName
                    && bso.getExpression2() instanceof Literal) {

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

     * @param filter
     * @return
     */
    public String getAttributeFilter() {
        // TODO: switch to the non deprecated splitter (that no one seems to be using)
        PostPreProcessFilterSplittingVisitor visitor = new PostPreProcessFilterSplittingVisitor(
                ATTRIBUTE_FILTER_CAPABILITIES, schema, null);
        filter.accept(visitor, null);
        Filter preFilter = visitor.getFilterPre();
        if (preFilter != Filter.EXCLUDE && preFilter != Filter.INCLUDE) {
            FilterToRestrictedWhere sqlConverter = new FilterToRestrictedWhere(schema);
            preFilter.accept(sqlConverter, null);
            return sqlConverter.getRestrictedWhere();
        }

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

        }


        Filter[] split = new Filter[2];
        if ( original != null ) {
            //create a filter splitter
            PostPreProcessFilterSplittingVisitor splitter = new PostPreProcessFilterSplittingVisitor(getDataStore()
                    .getFilterCapabilities(), featureSource.getSchema(), null);
            original.accept(splitter, null);
        
            split[0] = splitter.getFilterPre();
            split[1] = splitter.getFilterPost();
        }
        
        // handle three-valued logic differences by adding "is not null" checks in the filter,
        // the simplifying filter visitor will take care of them if they are redundant
        NullHandlingVisitor nhv = new NullHandlingVisitor(source.getSchema());

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Examples of org.geotools.filter.visitor.PostPreProcessFilterSplittingVisitor

    Filter[] splitFilter(Filter fnOriginalFilter) {
        /* Split filter into 2 parts */
        Filter[] split = new Filter[2];
        if (fnOriginalFilter != null) {
            //create a filter splitter
            PostPreProcessFilterSplittingVisitor splitter = new PostPreProcessFilterSplittingVisitor(ods.ODS_FILTER_CAPABILITIES, getSchema(), null);


            fnOriginalFilter.accept(splitter, null);
            /* Natively supported*/
            split[0] = splitter.getFilterPre();
            /* Not natively supported*/
            split[1] = splitter.getFilterPost();
        }
        /* Getting simplest possible filter*/
        SimplifyingFilterVisitor visitor = new SimplifyingFilterVisitor();


        split[0] = (Filter) split[0].accept(visitor, null);

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