# OSGeo::FDO::Filter

## Classes
class | OSGeo::FDO::Filter::BinaryLogicalOperator
| The BinaryLogicalOperator class derives from LogicalOperator and allows two filters to be combined via a logical "and" or a logical "or". More...
class | OSGeo::FDO::Filter::ComparisonCondition
| The ComparisonCondition class derives SearchCondition and can be used to test the equality of two expressions. More...
class | OSGeo::FDO::Filter::DistanceCondition
| The DistanceCondition class derives GeometricCondition and can be used to test whether the value of a geometric property is within or beyond a specified distance of the specified geometric value. Some feature providers may only support literal geometric values; if so, the provider's capabilities will indicate this limitation. More...
class | OSGeo::FDO::Filter::Filter
| Filter is an abstract class which acts as a base class for condition and operator classes that can occur in a filter expression tree. The Filter class contains operations for converting between the text and expression tree representation of a filter. More...
class | OSGeo::FDO::Filter::GeometricCondition
| GeometricCondition is an abstract class that derives from SearchCondition and can be used to test whether the value of a geometric property meets a particular spatial criteria. GeometricCondition is the base class for DistanceCondition and SpatialCondition. More...
interface | OSGeo::FDO::Filter::IFilterProcessor
| The IFilterProcessor interface can be used to process the nodes in a filter tree. It declares a process operation for each concrete class in the filter hierarchy. Providers or client applications can create classes that realize this interface to do something meaningful with a filter hierarchy. For example, a RDBMS feature provider can implement a processor class to convert a filter hierarchy to the SQL equivalent syntax. More...
class | OSGeo::FDO::Filter::IFilterProcessorImp
| The IFilterProcessor interface can be used to process the nodes in a filter tree. It declares a process operation for each concrete class in the filter hierarchy. Providers or client applications can create classes that realize this interface to do something meaningful with a filter hierarchy. For example, a RDBMS feature provider can implement a processor class to convert a filter hierarchy to the SQL equivalent syntax. More...
class | OSGeo::FDO::Filter::InCondition
| The InCondition class derives from SearchCondition and can be used to test if the value of a specified data property is within a given set of literal values. More...
class | OSGeo::FDO::Filter::LogicalOperator
| The LogicalOperator is an abstract base class. BinaryLogicalOperator and UnaryLogicalOperator derive from the LogicalOperator class. More...
class | OSGeo::FDO::Filter::NullCondition
| The NullCondition class derives from SearchCondition and can be used to test if the value of a specified data property is null. More...
class | OSGeo::FDO::Filter::SearchCondition
| The SearchCondition is an abstract base class. SpatialCondition, ComparisonCondition, LikeCondition, InCondition, and NullCondition derive from the SearchCondition class. More...
class | OSGeo::FDO::Filter::SpatialCondition
| The SpatialCondition class derives from GeometricCondition and can be used to test whether the value of a geometric property (referenced using the name of the property) and another geometric value satisfy the spatial relationship implied by the operation. Some feature providers may only support literal geometric values; if so, the provider's capabilities will indicate this limitation. More...
class | OSGeo::FDO::Filter::UnaryLogicalOperator
| The UnaryLogicalOperator class derives from LogicalOperator and allows a logical "Not" to be performed against a filter. More...
class | OSGeo::FDO::Filter::ValueExpressionCollection
| The ValueExpressionCollection is a collection of ValueExpression objects. More...
## Enumerations
enum | BinaryLogicalOperations { BinaryLogicalOperations_And = FdoBinaryLogicalOperations_And, BinaryLogicalOperations_Or = FdoBinaryLogicalOperations_Or }
| The BinaryLogicalOperations enumeration lists the binary logical operations available. More...
enum | ComparisonOperations { ComparisonOperations_EqualTo = FdoComparisonOperations_EqualTo, ComparisonOperations_NotEqualTo = FdoComparisonOperations_NotEqualTo, ComparisonOperations_GreaterThan = FdoComparisonOperations_GreaterThan, ComparisonOperations_GreaterThanOrEqualTo = FdoComparisonOperations_GreaterThanOrEqualTo, ComparisonOperations_LessThan = FdoComparisonOperations_LessThan, ComparisonOperations_LessThanOrEqualTo = FdoComparisonOperations_LessThanOrEqualTo, ComparisonOperations_Like = FdoComparisonOperations_Like }
| The ComparisonOperations enumeration lists the comparison operations available. More...
enum | ConditionType { ConditionType_Comparison = FdoConditionType_Comparison, ConditionType_Like = FdoConditionType_Like, ConditionType_In = FdoConditionType_In, ConditionType_Null = FdoConditionType_Null, ConditionType_Spatial = FdoConditionType_Spatial, ConditionType_Distance = FdoConditionType_Distance }
| The ConditionType enumeration defines the filter condition types available. This enumeration is used in the capabilities. More...
enum | DistanceOperations { DistanceOperations_Beyond = FdoDistanceOperations_Beyond, DistanceOperations_Within = FdoDistanceOperations_Within }
| The DistanceOperations enumeration lists the distance conditions available. More...
enum | SpatialOperations { SpatialOperations_Contains = FdoSpatialOperations_Contains, SpatialOperations_Crosses = FdoSpatialOperations_Crosses, SpatialOperations_Disjoint = FdoSpatialOperations_Disjoint, SpatialOperations_Equals = FdoSpatialOperations_Equals, SpatialOperations_Intersects = FdoSpatialOperations_Intersects, SpatialOperations_Overlaps = FdoSpatialOperations_Overlaps, SpatialOperations_Touches = FdoSpatialOperations_Touches, SpatialOperations_Within = FdoSpatialOperations_Within, SpatialOperations_CoveredBy = FdoSpatialOperations_CoveredBy, SpatialOperations_Inside = FdoSpatialOperations_Inside, SpatialOperations_EnvelopeIntersects = FdoSpatialOperations_EnvelopeIntersects }
| The SpatialOperations enumeration lists the spatial conditions available. More...
enum | UnaryLogicalOperations { UnaryLogicalOperations_Not = FdoUnaryLogicalOperations_Not }
| The UnaryLogicalOperations enumeration lists the unary logical operations available. More...