本文整理了Java中org.opengis.filter.FilterFactory2.isNull()方法的一些代码示例，展示了FilterFactory2.isNull()的具体用法。这些代码示例主要来源于Github/Stackoverflow/Maven等平台，是从一些精选项目中提取出来的代码，具有较强的参考意义，能在一定程度帮忙到你。FilterFactory2.isNull()方法的具体详情如下：
包路径：org.opengis.filter.FilterFactory2
类名称：FilterFactory2
方法名：isNull

FilterFactory2.isNull介绍

暂无

代码示例

代码示例来源：origin: geotools/geotools

public Object visit(PropertyIsNull filter, Object arg1) {
  Expression nullCheck = filter.getExpression();
  List sourceChecks = (List) nullCheck.accept(this, null);
  List combined = new ArrayList(sourceChecks.size());
  for (Iterator it = sourceChecks.iterator(); it.hasNext(); ) {
    Expression sourceValue = (Expression) it.next();
    Filter newFilter = ff.isNull(sourceValue);
    combined.add(newFilter);
  }
  Filter unrolled = combineOred(combined);
  return unrolled;
}

代码示例来源：origin: geotools/geotools

/**
   * Parses a null filter from a node known to be a null node.
   *
   * @param nullNode the PropertyIsNull node.
   * @return a null filter of the expression contained in null node.
   * @throws IllegalFilterException DOCUMENT ME!
   */
  private static PropertyIsNull parseNullFilter(Node nullNode) throws IllegalFilterException {

    final ExpressionDOMParser expressionDOMParser = new ExpressionDOMParser(FILTER_FACT);

    LOGGER.finest("parsing null node: " + nullNode);

    Node value = nullNode.getFirstChild();

    while (value.getNodeType() != Node.ELEMENT_NODE) {
      value = value.getNextSibling();
    }

    LOGGER.finest("add null value -> " + value + "<-");
    Expression expr = expressionDOMParser.expression(value);

    return FILTER_FACT.isNull(expr);
  }
}

代码示例来源：origin: geotools/geotools

/**
 * @see org.geotools.xml.schema.Type#getValue(org.geotools.xml.schema.Element,
 *     org.geotools.xml.schema.ElementValue[], org.xml.sax.Attributes, java.util.Map)
 */
public Object getValue(Element element, ElementValue[] value, Attributes attrs, Map hints)
    throws SAXException {
  FilterFactory2 factory = FilterSchema.filterFactory(hints);
  try {
    Expression expr = (Expression) value[0].getValue();
    return factory.isNull(expr);
  } catch (ClassCastException expressionRequired) {
    throw new SAXException("Illegal filter for " + element, expressionRequired);
  } catch (IllegalFilterException e) {
    throw new SAXException("Illegal filter for " + element);
  }
}

代码示例来源：origin: geotools/geotools

public Object visit(PropertyIsNull filter, Object extraData) {
  Expression expr = visit(filter.getExpression(), extraData);
  return getFactory(extraData).isNull(expr);
}

代码示例来源：origin: geotools/geotools

static PropertyIsNull propertyIsNull() {
  return f.isNull(propertyName());
}

代码示例来源：origin: geotools/geotools

/**
 * Test the null operator.
 *
 * @throws IllegalFilterException If the constructed filter is not valid.
 */
public void testNull() throws IllegalFilterException {
  PropertyIsNull filter = fac.isNull(fac.property("foo"));
  assertAttributeName(filter, new String[] {"foo"});
}

代码示例来源：origin: geotools/geotools

/**
 * Guards the filter against potential null values in the target property name (if it is a
 * property name, to start with)
 */
private Filter guardAgainstNulls(Filter filter, Expression potentialPropertyName) {
  if (potentialPropertyName instanceof PropertyName) {
    PropertyName pn = (PropertyName) potentialPropertyName;
    String name = pn.getPropertyName();
    if (isNillable(name)) {
      Not notNull = ff.not(ff.isNull(ff.property(name)));
      if (filter instanceof And) {
        And and = (And) filter;
        List<Filter> children = new ArrayList<Filter>(and.getChildren());
        children.add(notNull);
        return ff.and(children);
      } else {
        return ff.and(filter, notNull);
      }
    }
  }
  return filter;
}

代码示例来源：origin: geotools/geotools

private Not propertyNotNull(String name) {
    return ff.not(ff.isNull(ff.property(name)));
  }
}

代码示例来源：origin: geotools/geotools

public void testIdCollector() {
    Filter filter = ff.isNull(ff.property("name"));
    Set fids = (Set) filter.accept(IdCollectorFilterVisitor.ID_COLLECTOR, new HashSet());
    assertTrue(fids.isEmpty());
    assertFalse(fids.contains("eclesia"));

    filter = ff.id(Collections.singleton(ff.featureId("eclesia")));
    fids = (Set) filter.accept(IdCollectorFilterVisitor.ID_COLLECTOR, new HashSet());
    assertFalse(fids.isEmpty());
    assertTrue(fids.contains("eclesia"));
  }
}

代码示例来源：origin: geotools/geotools

/**
 * Test the null operator.
 *
 * @throws IllegalFilterException If the constructed filter is not valid.
 */
public void testNull() throws IllegalFilterException {
  // Test for false positive.
  PropertyName testAttribute = new AttributeExpressionImpl(testSchema, "testString");
  PropertyIsNull filter = fac.isNull(org.opengis.filter.expression.Expression.NIL);
  assertTrue(filter.evaluate(testFeature));
  filter = fac.isNull(testAttribute);
  assertFalse(filter.evaluate(testFeature));
}

代码示例来源：origin: geotools/geotools

@Test
public void testNull() {
  Filter filter = ff.isNull(ff.property("name"));
  Envelope env = (Envelope) filter.accept(visitor, null);
  assertEquals(infinity, env);
}

代码示例来源：origin: geotools/geotools

public void testNullFilterVisitor() {
  Filter filter = ff.isNull(ff.property("name"));
  assertEquals(Integer.valueOf(1), filter.accept(NullFilterVisitor.NULL_VISITOR, 1));
  filter = Filter.INCLUDE;
  assertEquals(Integer.valueOf(1), filter.accept(NullFilterVisitor.NULL_VISITOR, 1));
  FilterVisitor allFids =
      new NullFilterVisitor() {
        public Object visit(Id filter, Object data) {
          if (data == null) return null;
          Set set = (Set) data;
          set.addAll(filter.getIDs());
          return set;
        }
      };
  Filter myFilter = ff.id(Collections.singleton(ff.featureId("fred")));
  Set set = (Set) myFilter.accept(allFids, new HashSet());
  assertNotNull(set);
  Set set2 = (Set) myFilter.accept(allFids, null); // set2 will be null
  assertNull(set2);
}

代码示例来源：origin: geotools/geotools

public void testIdFinderFilterVisitor() {
  Filter filter = ff.isNull(ff.property("name"));
  boolean found = (Boolean) filter.accept(new IdFinderFilterVisitor(), null);
  assertFalse(found);
  filter = ff.id(Collections.singleton(ff.featureId("eclesia")));
  found = (Boolean) filter.accept(new IdFinderFilterVisitor(), null);
  assertTrue(found);
}

代码示例来源：origin: geotools/geotools

@Test
public void testAndIsNull() throws Exception {
  final Filter f =
      ff.and(ff.bbox("geom", -10, -10, 10, 10, null), ff.isNull(ff.literal("someDate")));
  final Envelope env = (Envelope) f.accept(visitor, null);
  assertEquals(new Envelope(-10, 10, -10, 10), env);
}

代码示例来源：origin: geotools/geotools

@Test
public void testNullFilter() throws Exception {
  PropertyIsNull nullFilter = ff.isNull(ff.property("measurement/result"));
  Filter unrolled = (Filter) nullFilter.accept(visitor, null);
  assertTrue(unrolled instanceof PropertyIsNull);
  assertNotSame(nullFilter, unrolled);
  PropertyIsNull unmapped = (PropertyIsNull) unrolled;
  Expression unmappedAtt = unmapped.getExpression();
  assertTrue(unmappedAtt instanceof PropertyName);
  assertEquals("results_value", ((PropertyName) unmappedAtt).getPropertyName());
}

代码示例来源：origin: org.geotools/gt-app-schema

public Object visit(PropertyIsNull filter, Object arg1) {
  Expression nullCheck = filter.getExpression();
  List sourceChecks = (List) nullCheck.accept(this, null);
  List combined = new ArrayList(sourceChecks.size());
  for (Iterator it = sourceChecks.iterator(); it.hasNext();) {
    Expression sourceValue = (Expression) it.next();
    Filter newFilter = ff.isNull(sourceValue);
    combined.add(newFilter);
  }
  Filter unrolled = combineOred(combined);
  return unrolled;
}

代码示例来源：origin: geotools/geotools

PropertyIsNull nullFilter = fac.isNull(testAttribute);

代码示例来源：origin: org.geotools/gt-main

public Object visit(PropertyIsNull filter, Object extraData) {
  Expression expr= visit(filter.getExpression(), extraData);
  return getFactory(extraData).isNull(expr);
}

代码示例来源：origin: org.geotools/gt2-main

public Object visit(PropertyIsNull filter, Object extraData) {
  Expression expr=(Expression) filter.getExpression().accept(this, extraData);
  return getFactory(extraData).isNull(expr);
}

代码示例来源：origin: org.geotools/gt-app-schema

@Test
public void testNullFilter() throws Exception {
  PropertyIsNull nullFilter = ff.isNull(ff.property("measurement/result"));
  Filter unrolled = (Filter) nullFilter.accept(visitor, null);
  assertTrue(unrolled instanceof PropertyIsNull);
  assertNotSame(nullFilter, unrolled);
  PropertyIsNull unmapped = (PropertyIsNull) unrolled;
  Expression unmappedAtt = unmapped.getExpression();
  assertTrue(unmappedAtt instanceof PropertyName);
  assertEquals("results_value", ((PropertyName) unmappedAtt).getPropertyName());
}