Package org.geotools.filter

Class LogicFilterImpl

Object

FilterAbstract

AbstractFilter

BinaryLogicAbstract

LogicFilterImpl

All Implemented Interfaces:

Filter, FilterType

Direct Known Subclasses:

AndImpl, NotImpl, OrImpl

public abstract class LogicFilterImpl
extends BinaryLogicAbstract

Defines a logic filter (the only filter type that contains other filters). This filter holds one or more filters together and relates them logically with an internally defined type (AND, OR, NOT).

Author:

Rob Hranac, TOPP

Field Summary

Fields inherited from class BinaryLogicAbstract

children

Fields inherited from class AbstractFilter

LOGGER

Fields inherited from interface Filter

EXCLUDE, INCLUDE

Fields inherited from interface FilterType

ALL, BETWEEN, COMPARE_EQUALS, COMPARE_GREATER_THAN, COMPARE_GREATER_THAN_EQUAL, COMPARE_LESS_THAN, COMPARE_LESS_THAN_EQUAL, COMPARE_NOT_EQUALS, FID, GEOMETRY_BBOX, GEOMETRY_BEYOND, GEOMETRY_CONTAINS, GEOMETRY_CROSSES, GEOMETRY_DISJOINT, GEOMETRY_DWITHIN, GEOMETRY_EQUALS, GEOMETRY_INTERSECTS, GEOMETRY_OVERLAPS, GEOMETRY_TOUCHES, GEOMETRY_WITHIN, LIKE, LOGIC_AND, LOGIC_NOT, LOGIC_OR, NONE, NULL

Constructor Summary

Constructors

Modifier	Constructor	Description
protected	LogicFilterImpl(List<Filter> children)
protected	LogicFilterImpl(Filter filter1, Filter filter2, short filterType)	Convenience constructor to create an AND/OR logic filter.

Method Summary

Modifier and Type	Method	Description
abstract Object	accept(FilterVisitor visitor, Object extraData)	Used by FilterVisitors to perform some action on this filter instance.
void	addFilter(Filter filter)	Adds a sub filter to this filter.
boolean	equals(Object o)	Compares this filter to the specified object.
Iterator	getFilterIterator()	Gets an iterator for the filters held by this logic filter.
int	hashCode()	Override of hashCode method.
String	toString()	Returns a string representation of this filter.

Methods inherited from class BinaryLogicAbstract

getChildren, setChildren

Methods inherited from class AbstractFilter

isCompareFilter, isGeometryDistanceFilter, isGeometryFilter, isLogicFilter, isMathFilter, isSimpleFilter

Methods inherited from class FilterAbstract

accepts, eval, eval

Methods inherited from class Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Methods inherited from interface Filter

evaluate

Constructor Detail

LogicFilterImpl

protected LogicFilterImpl(List<Filter> children)

LogicFilterImpl

protected LogicFilterImpl(Filter filter1,
                          Filter filter2,
                          short filterType)
                   throws IllegalFilterException

Convenience constructor to create an AND/OR logic filter.

Parameters:

filter1 - An initial sub filter.

filter2 - An initial sub filter.

filterType - The final relation between all sub filters.

Throws:

IllegalFilterException - Does not conform to logic filter structure

Method Detail

addFilter

public final void addFilter(Filter filter)
                     throws IllegalFilterException

Adds a sub filter to this filter.

Parameters:

filter - Specified filter to add to the sub filter list.

Throws:

IllegalFilterException - Does not conform to logic filter structure

TODO:

REVISIT: make all filters immutable. This should return a new filter.

getFilterIterator

public Iterator getFilterIterator()

Gets an iterator for the filters held by this logic filter.

Returns:

the iterator of the filters.

toString

public String toString()

Returns a string representation of this filter.

Overrides:

toString in class Object

Returns:

String representation of the logic filter.

equals

public boolean equals(Object o)

Compares this filter to the specified object. Returns true if the passed in object is the same as this filter. Checks to make sure the filter types are the same, and then checks that the subFilters lists are the same size and that one list contains the other. This means that logic filters with different internal orders of subfilters are equal.

Overrides:

equals in class BinaryLogicAbstract

Parameters:

o - - the object to compare this LogicFilter against.

Returns:

true if specified object is equal to this filter; false otherwise.

hashCode

public int hashCode()

Override of hashCode method.

Overrides:

hashCode in class BinaryLogicAbstract

Returns:

a code to hash this object by.

accept

public abstract Object accept(FilterVisitor visitor,
                              Object extraData)

Used by FilterVisitors to perform some action on this filter instance. Typicaly used by Filter decoders, but may also be used by any thing which needs infomration from filter structure. Implementations should always call: visitor.visit(this); It is importatant that this is not left to a parent class unless the parents API is identical.

Parameters:

visitor - The visitor which requires access to this filter, the method must call visitor.visit(this);