import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
/**
 * Write the FilterBuilder for a Not filter
 * 
 * @param filter the filter to visit
 * @param extraData extra data (unused by this method)
 * 
 */
public Object visit(Not filter, Object extraData) {
    if(filter.getFilter() instanceof PropertyIsNull) {
        Expression expr = ((PropertyIsNull) filter.getFilter()).getExpression();
        expr.accept(this, extraData);
    } else {
        filter.getFilter().accept(this, extraData);
    }

    if(filter.getFilter() instanceof PropertyIsNull) {
        queryBuilder = ImmutableMap.of("exists", ImmutableMap.of("field", field));
    } else {
        queryBuilder = ImmutableMap.of("bool", ImmutableMap.of("must_not", queryBuilder));
    }
    return extraData;
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
/**
 * Sets the capabilities of this filter.
 *
 * @return FilterCapabilities for this Filter
 */
protected FilterCapabilities createFilterCapabilities() {
    FilterCapabilities capabilities = new FilterCapabilities();

    capabilities.addAll(FilterCapabilities.LOGICAL_OPENGIS);
    capabilities.addAll(FilterCapabilities.SIMPLE_COMPARISONS_OPENGIS);
    capabilities.addType(PropertyIsNull.class);
    capabilities.addType(PropertyIsBetween.class);
    capabilities.addType(Id.class);
    capabilities.addType(IncludeFilter.class);
    capabilities.addType(ExcludeFilter.class);
    capabilities.addType(PropertyIsLike.class);

    // spatial filters
    capabilities.addType(BBOX.class);
    capabilities.addType(Contains.class);
    //capabilities.addType(Crosses.class);
    capabilities.addType(Disjoint.class);
    //capabilities.addType(Equals.class);
    capabilities.addType(Intersects.class);
    //capabilities.addType(Overlaps.class);
    //capabilities.addType(Touches.class);
    capabilities.addType(Within.class);
    capabilities.addType(DWithin.class);
    capabilities.addType(Beyond.class);

    //temporal filters
    capabilities.addType(After.class);
    capabilities.addType(Before.class);
    capabilities.addType(Begins.class);
    capabilities.addType(BegunBy.class);
    capabilities.addType(During.class);
    capabilities.addType(Ends.class);
    capabilities.addType(EndedBy.class);
    capabilities.addType(TContains.class);
    capabilities.addType(TEquals.class);

    return capabilities;
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
@Test
public void testPropertyIsNull() {
    PropertyIsNull filter = ff.isNull(ff.property("prop"));
    Map<String,Object> expected = ImmutableMap.of("bool", ImmutableMap.of("must_not",
            ImmutableMap.of("exists", ImmutableMap.of("field", "prop"))));

    builder.visit(filter, null);
    assertTrue(builder.createFilterCapabilities().fullySupports(filter));
    assertEquals(expected, builder.getQueryBuilder());
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
@Test
public void testGetFeaturesWithIsNullFilter() throws Exception {
    init();
    FilterFactory ff = dataStore.getFilterFactory();
    PropertyIsNull f = ff.isNull(ff.property("security_ss"));
    SimpleFeatureCollection features = featureSource.getFeatures(f);
    assertEquals(1, features.size());
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
@Override
public Object visit(
		final PropertyIsNull filter,
		final Object data ) {
	return new ExtractGeometryFilterVisitorResult(
			infinity(),
			null);
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
@Override
public Object visit(
		final PropertyIsNull filter,
		final Object data ) {

	return new PropertyConstraintSet();
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
@Override
public Object visit(
		final PropertyIsNull filter,
		final Object extraData ) {
	if (!usesProperty(filter)) {
		return Filter.INCLUDE;
	}
	return super.visit(
			filter,
			extraData);
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
/** {@inheritDoc} */
@Override
public Object visit(PropertyIsNull filter, Object userData) {
	String propertyName = getPropertyName(filter.getExpression());
	String finalName = parsePropertyName(propertyName, userData);
	return Restrictions.isNull(finalName);
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
/**
 * Adds the filter.
 *
 * @param node the node
 * @return the filter
 */
private Filter addFilter(FilterNode node) {
    Filter filter = node.getFilter();

    FilterConfigInterface filterConfig = node.getFilterConfig();

    if (filter instanceof LogicFilterImpl) {
        List<Filter> filterList = new ArrayList<Filter>();

        createFilterList(node, filterList);

        return filterConfig.createLogicFilter(filterList);
    }

    List<Expression> parameterFilter = new ArrayList<Expression>();

    if (filter instanceof FidFilterImpl) {
        createExpressionParameterList(node, 1, parameterFilter);
    } else if (filter instanceof BinaryTemporalOperator) {
        createExpressionParameterList(node, 2, parameterFilter);
    } else if (filter instanceof PropertyIsBetween) {
        createExpressionParameterList(node, 3, parameterFilter);
    } else if (filter instanceof PropertyIsNull) {
        createExpressionParameterList(node, 1, parameterFilter);
    } else if (filter instanceof PropertyIsLike) {
        createExpressionParameterList(node, 6, parameterFilter);
    } else if (filter instanceof BinarySpatialOperator) {
        createExpressionParameterList(node, 2, parameterFilter);
    } else if (filter instanceof BinaryComparisonAbstract) {
        if (filter instanceof Not) {
            createExpressionParameterList(node, 1, parameterFilter);
        } else if (filter instanceof PropertyIsGreaterThan) {
            createExpressionParameterList(node, 2, parameterFilter);
        } else {
            createExpressionParameterList(node, 3, parameterFilter);
        }
    } else {
        return filter;
    }

    return filterConfig.createFilter(parameterFilter);
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
@Override
public Object visit(PropertyIsNull pin, Object o) {
    throw new UnsupportedOperationException("Not supported yet."); //To change body of generated methods, choose Tools | Templates.
}
 

import org.opengis.filter.PropertyIsNull; //导入依赖的package包/类
@Override
public Object visit(
		final PropertyIsNull filter,
		final Object data ) {
	return new TemporalConstraints();
}