Examples of SimplifyingFilterVisitor

org.geotools.filter.visitor.SimplifyingFilterVisitor
Takes a filter and returns a simplified, equivalent one. At the moment the filter:
- simplifies out {@link Filter#INCLUDE} and {@link Filter#EXCLUDE} in logical expressions
- removes double logic negations
- deal with FID filter validation removing invalid fids
- optimize out all non volatile functions that do not happen to use attributes, replacing them with literals
FID filter validation is meant to wipe out non valid feature ids from {@link Id} filters. This isso in order to avoid sending feature ids down to DataStores that are not valid as per the specific FeatureType fid structure. Since this is structure is usually DataStore specific, some times being a strategy based on how the feature type primary key is generated, fid validation is abstracted out to the {@link FIDValidator} interface so when a DataStore is about to send a querydown to the backend it van provide this visitor with a validator specific for the feature type fid structure being queried.

By default all feature ids are valid. DataStores that want non valid fids to be wiped out should set a {@link FIDValidator} through the {@link #setFIDValidator(FIDValidator)} method.
@author Andrea Aime - OpenGeo @author Gabriel Roldan (OpenGeo) @since 2.5.x @version $Id$ @source $URL$

Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

        
        // simplify the filter, it may contain needless parts that cannot be encoded
        // e.g., Filter.INCLUDE mixed with other filters
        Filter filter = query.getFilter();
        if(filter != Filter.INCLUDE) {
            SimplifyingFilterVisitor visitor = new SimplifyingFilterVisitor();
            Filter simplified = (Filter) filter.accept(visitor, null);
            query.setFilter(simplified);
        }
        
        if(store.preferredProtocol == HttpMethod.POST) {

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

    protected Filter simplify(Filter filter) {
        if (Filter.INCLUDE.equals(filter) || Filter.EXCLUDE.equals(filter)) {
            return filter;
        }


        SimplifyingFilterVisitor simplifier = new SimplifyingFilterVisitor();
        filter = (Filter) filter.accept(simplifier, null);
        return filter;
    }

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

     * @return a two-element array where the first element is the supported filter and the second
     *         the one to post-process
     * @see WFSStrategy#splitFilters(WFS_1_1_0_Protocol, Filter)
     */
    public Filter[] splitFilters(Capabilities caps, Filter queryFilter) {
        SimplifyingFilterVisitor simplifier = new SimplifyingFilterVisitor(); 
        queryFilter = (Filter) queryFilter.accept(simplifier, null);
        
        // ID Filters aren't allowed to be parameters in Logical or Comparison Operators
        
        FilterCapabilities filterCapabilities = caps.getContents();

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

                }
            }
            FilterFactory ff = CommonFactoryFinder.getFilterFactory(null);
            serverFilter = ff.and(serverChild);
            postFilter = ff.and(postChild);
            SimplifyingFilterVisitor sfv = new SimplifyingFilterVisitor();
            serverFilter = (Filter) serverFilter.accept(sfv, null);
            postFilter = (Filter) postFilter.accept(sfv, null);
        }


        return new Filter[] { serverFilter, postFilter };

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

                    }
                }
            }
            FilterFactory ff = CommonFactoryFinder.getFilterFactory();
            serverFilter = ff.and(children);
            SimplifyingFilterVisitor sfv = new SimplifyingFilterVisitor();
            serverFilter = (Filter) serverFilter.accept(sfv, null);
        }
        return new Filter[] { serverFilter, postFilter };
    }

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor


    private Filter filter;


    public OGRFilterTranslator(SimpleFeatureType schema, Filter filter) {
        this.schema = schema;
        SimplifyingFilterVisitor simplifier = new SimplifyingFilterVisitor();
        this.filter = (Filter) filter.accept(simplifier, null);
    }

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

        // 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());
        split[0] = (Filter) split[0].accept(nhv, null);
        
        SimplifyingFilterVisitor visitor = new SimplifyingFilterVisitor();
        visitor.setFIDValidator( new PrimaryKeyFIDValidator( featureSource ) );
        split[0] = (Filter) split[0].accept(visitor, null);
        split[1] = (Filter) split[1].accept(visitor, null);
        
        return split;
    }

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

     */
    @Override
    protected FeatureReader<SimpleFeatureType, SimpleFeature> getReaderInternal(Query fnQuery) throws IOException {
        // simplify the filter
        Filter filter = fnQuery.getFilter();
        SimplifyingFilterVisitor simplifier = new SimplifyingFilterVisitor();
        filter = (Filter) filter.accept(simplifier, null);
        
        // Split the filter into two parts, pre and post 
        Filter[] split = splitFilter(filter);

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

            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);


        split[1] = (Filter) split[1].accept(visitor, null);

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Examples of org.geotools.filter.visitor.SimplifyingFilterVisitor

        if (unscaled instanceof Literal) {
            processLiteralExpression((Literal) unscaled, defaultUnit);
        } else {
            // see if we can still optimize
            PropertyIsNull test = ff.isNull(unscaled);
            Filter simplified = (Filter) test.accept(new SimplifyingFilterVisitor(), null);
            if (simplified == Filter.INCLUDE) {
                // special case, the expression was nil to start with
                this.expression = NilExpression.NIL;
                this.uom = defaultUnit;
            } else if (simplified instanceof PropertyIsNull) {

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