org.geotools.filter

Class LikeFilterImpl

Object

FilterAbstract

AbstractFilter

LikeFilterImpl

All Implemented Interfaces:

FilterType, Filter, MultiValuedFilter, PropertyIsLike

public class LikeFilterImpl
extends AbstractFilter
implements PropertyIsLike

Defines a like filter, which checks to see if an attribute matches a REGEXP.

Author:

Rob Hranac, Vision for New York

Nested Class Summary

Nested classes/interfaces inherited from interface MultiValuedFilter

MultiValuedFilter.MatchAction

Field Summary

Fields

Modifier and Type	Field and Description
protected MultiValuedFilter.MatchAction	matchAction Used to indicate action with multiple values *

Fields inherited from class AbstractFilter

LOGGER

Fields inherited from interface PropertyIsLike

NAME

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 and Description
protected	LikeFilterImpl() Constructor which flags the operator as like.
	LikeFilterImpl(Expression expr, String pattern, String wildcardMulti, String wildcardSingle, String escape)
	LikeFilterImpl(Expression expr, String pattern, String wildcardMulti, String wildcardSingle, String escape, MultiValuedFilter.MatchAction matchAction)
protected	LikeFilterImpl(MultiValuedFilter.MatchAction matchAction)

Method Summary

Modifier and Type	Method and Description
Object	accept(FilterVisitor visitor, Object extraData) Used by FilterVisitors to perform some action on this filter instance.
static String	convertToSQL92(char escape, char multi, char single, boolean matchCase, String pattern) Given OGC PropertyIsLike Filter information, construct an SQL-compatible 'like' pattern.
boolean	equals(Object o) Compares this filter to the specified object.
boolean	evaluate(Object feature) Determines whether or not a given feature matches this pattern.
String	getEscape() Getter for property escape.
Expression	getExpression() Gets the expression for hte filter.
String	getLiteral() Returns the pattern.
MultiValuedFilter.MatchAction	getMatchAction() * Flag Controlling MatchAction property When one or more of the operands evaluates to multiple values rather than a single value, which action should be taken?
String	getSingleChar() Getter for property wildcardSingle.
String	getSQL92LikePattern() see convertToSQL92
String	getWildCard() Getter for property wildcardMulti
int	hashCode() Override of hashCode method.
boolean	isMatchingCase() Flag controlling wither comparisons are case sensitive.
void	setEscape(String escape)
void	setExpression(Expression e)
void	setLiteral(String literal) Sets the pattern.
void	setMatchCase(boolean matchingCase)
void	setMatchingCase(boolean matchingCase)
void	setSingleChar(String singleChar)
void	setWildCard(String wildCard)
String	toString() Return this filter as a string.

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

Field Detail

matchAction

protected MultiValuedFilter.MatchAction matchAction

Used to indicate action with multiple values *

Constructor Detail

LikeFilterImpl

protected LikeFilterImpl()

Constructor which flags the operator as like.

LikeFilterImpl

public LikeFilterImpl(Expression expr,
                      String pattern,
                      String wildcardMulti,
                      String wildcardSingle,
                      String escape)

LikeFilterImpl

protected LikeFilterImpl(MultiValuedFilter.MatchAction matchAction)

LikeFilterImpl

public LikeFilterImpl(Expression expr,
                      String pattern,
                      String wildcardMulti,
                      String wildcardSingle,
                      String escape,
                      MultiValuedFilter.MatchAction matchAction)

Method Detail

convertToSQL92

public static String convertToSQL92(char escape,
                                    char multi,
                                    char single,
                                    boolean matchCase,
                                    String pattern)
                             throws IllegalArgumentException

Given OGC PropertyIsLike Filter information, construct an SQL-compatible 'like' pattern.

SQL % --> match any number of characters _ --> match a single character

NOTE; the SQL command is 'string LIKE pattern [ESCAPE escape-character]' We could re-define the escape character, but I'm not doing to do that in this code since some databases will not handle this case.

Method: 1.

Examples: ( escape ='!', multi='*', single='.' ) broadway* -> 'broadway%' broad_ay -> 'broad_ay' broadway -> 'broadway'

broadway!* -> 'broadway*' (* has no significance and is escaped) can't -> 'can''t' ( ' escaped for SQL compliance)

NOTE: we also handle "'" characters as special because they are end-of-string characters. SQL will convert ' to '' (double single quote).

NOTE: we dont handle "'" as a 'special' character because it would be too confusing to have a special char as another special char. Using this will throw an error (IllegalArgumentException).

Throws:

IllegalArgumentException

getSQL92LikePattern

public String getSQL92LikePattern()
                           throws IllegalArgumentException

see convertToSQL92

Throws:

IllegalArgumentException

setWildCard

public void setWildCard(String wildCard)

setSingleChar

public void setSingleChar(String singleChar)

setEscape

public void setEscape(String escape)

setMatchCase

public void setMatchCase(boolean matchingCase)

isMatchingCase

public boolean isMatchingCase()

Description copied from interface: PropertyIsLike

Flag controlling wither comparisons are case sensitive.

The ability to match case is pending the Filter 2.0 specification.

Specified by:

isMatchingCase in interface PropertyIsLike

Returns:

true if the comparison is case sensetive, otherwise false.

getMatchAction

public MultiValuedFilter.MatchAction getMatchAction()

Description copied from interface: MultiValuedFilter

* Flag Controlling MatchAction property When one or more of the operands evaluates to multiple values rather than a single value, which action should be taken? If there are n values for the left operand and m values for the right operand, there are n * m possible combinations that can be compared,

ANY - if any of the possible combinations match, the result is true (aggregated OR) ALL - only if all of the possible combinations match, the result is true (aggregated AND) ONE - only if exactly one of the possible combinations match, the result is true (aggregated XOR)

Specified by:

getMatchAction in interface MultiValuedFilter

Returns:

MatchAction flag

setMatchingCase

public void setMatchingCase(boolean matchingCase)

getExpression

public Expression getExpression()

Gets the expression for hte filter.

This method calls th deprecated #getValue() for backwards compatability with subclasses.

Specified by:

getExpression in interface PropertyIsLike

setExpression

public void setExpression(Expression e)

getLiteral

public String getLiteral()

Returns the pattern.

Specified by:

getLiteral in interface PropertyIsLike

setLiteral

public void setLiteral(String literal)

Sets the pattern.

evaluate

public boolean evaluate(Object feature)

Determines whether or not a given feature matches this pattern.

Specified by:

evaluate in interface Filter

Parameters:

feature - Specified feature to examine.

Returns:

Flag confirming whether or not this feature is inside the filter.

TODO:

REVISIT: could the pattern be null such that a null = null?

toString

public String toString()

Return this filter as a string.

Overrides:

toString in class Object

Returns:

String representation of this like filter.

getEscape

public String getEscape()

Getter for property escape.

Specified by:

getEscape in interface PropertyIsLike

Returns:

Value of property escape.

getWildCard

public String getWildCard()

Getter for property wildcardMulti

Specified by:

getWildCard in interface PropertyIsLike

See Also:

PropertyIsLike.getWildCard().

getSingleChar

public String getSingleChar()

Getter for property wildcardSingle.

Specified by:

getSingleChar in interface PropertyIsLike

See Also:

PropertyIsLike.getSingleChar()().

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, the value, and the pattern are the same. &

Overrides:

equals in class Object

Parameters:

o - - the object to compare this LikeFilter 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 Object

Returns:

the hash code for this like filter implementation.

accept

public 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.

Specified by:

accept in interface Filter

Parameters:

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