Examples of org.geotools.filter.visitor.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 $URL$

            filters.add(rule.getFilter());
        }
        // not or and and simplify (if there is any include/exclude we'll get 
        // a very simple result ;-)
        Filter or = ff.or(filters);
        SimplifyingFilterVisitor simplifier = new SimplifyingFilterVisitor();
        return (Filter) or.accept(simplifier, null);
    }

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    public void removeFeatures(Filter filter) throws IOException {
        Preconditions.checkState(getDataStore().isAllowTransactions(),
                "Transactions not supported; head is not a local branch");
        final WorkingTree workingTree = delegate.getWorkingTree();
        final String typeTreePath = delegate.getTypeTreePath();
        filter = (Filter) filter.accept(new SimplifyingFilterVisitor(), null);
        if (Filter.INCLUDE.equals(filter)) {
            workingTree.delete(typeTreePath);
            return;
        }
        if (Filter.EXCLUDE.equals(filter)) {

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        };
    }


    @Override
    protected ReferencedEnvelope getBoundsInternal(Query query) throws IOException {
        final Filter filter = (Filter) query.getFilter().accept(new SimplifyingFilterVisitor(),
                null);
        final CoordinateReferenceSystem crs = getSchema().getCoordinateReferenceSystem();
        if (Filter.INCLUDE.equals(filter) && oldRoot == null
                && ChangeType.ADDED.equals(changeType())) {
            NodeRef typeRef = getTypeRef();

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        return bounds;
    }


    @Override
    protected int getCountInternal(Query query) throws IOException {
        final Filter filter = (Filter) query.getFilter().accept(new SimplifyingFilterVisitor(),
                null);
        if (Filter.EXCLUDE.equals(filter)) {
            return 0;
        }

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            LOGGER.trace("GeoGigFeatureSource.getNativeReader: no screenMap provided");
        } else {
            LOGGER.trace("GeoGigFeatureSource.getNativeReader: using screenMap filter");
        }
        LOGGER.trace("Query filter: {}", filter);
        filter = (Filter) filter.accept(new SimplifyingFilterVisitor(), null);
        LOGGER.trace("Simplified filter: {}", filter);


        GeogigFeatureReader<SimpleFeatureType, SimpleFeature> nativeReader;


        final String rootRef = getRootRef();

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            // 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)

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

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        } else {
            query.getHints().putAll(hints);
        }


        // simplify the filter
        SimplifyingFilterVisitor simplifier = new SimplifyingFilterVisitor();
        Filter simplifiedFilter = (Filter) query.getFilter().accept(simplifier, null);
        query.setFilter(simplifiedFilter);
        
        return query;
    }

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        PropertyIsEqualTo equal = ff.equal(ff.property("a"), ff.property("b"), false);
        And and = ff.and(between, equal);
        
        NullHandlingVisitor nh = new NullHandlingVisitor();
        Filter nhResult = (Filter) and.accept(nh, null);
        SimplifyingFilterVisitor simplifier = new SimplifyingFilterVisitor();
        Filter simplified = (Filter) nhResult.accept(simplifier, null);
        assertTrue(simplified instanceof And);
        Filter expected = ff.and(Arrays.asList(between, equal, propertyNotNull("a"), propertyNotNull("b"), propertyNotNull("c")));
        assertEquals(expected, simplified);

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    @Test 
    public void testSimplify() throws Exception {
        Filter isCoverage = ECQL.toFilter("isCoverage() = true");


        SimplifyingFilterVisitor visitor = new SimplifyingFilterVisitor();
        Filter result = (Filter) isCoverage.accept(visitor, null);
        
        assertEquals(isCoverage, result);
    }

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