ALKMaps.Filter.Comparison

This class represents a comparison filter.

Inherits from

ALKMaps.Filter

Summary

ALKMaps.Filter.Comparison	This class represents a comparison filter.
Properties
type	{String} type: type of the comparison.
property	{String} name of the context property to compare
value	{Number} or {String} comparison value for binary comparisons.
matchCase	{Boolean} Force case sensitive searches for EQUAL_TO and NOT_EQUAL_TO comparisons.
lowerBoundary	{Number} or {String} lower boundary for between comparisons.
upperBoundary	{Number} or {String} upper boundary for between comparisons.
Constructor
ALKMaps.Filter.Comparison	Creates a comparison rule.
Functions
evaluate	Evaluates this filter in a specific context.
value2regex	Converts the value of this rule into a regular expression string, according to the wildcard characters specified.
regex2value	Convert the value of this rule from a regular expression string into an ogc literal string using a wildCard of *, a singleChar of ., and an escape of !.
clone	Clones this filter.

Properties

type

{String} type: type of the comparison. This is one of

ALKMaps.Filter.Comparison.EQUAL_TO = “==”;
ALKMaps.Filter.Comparison.NOT_EQUAL_TO = “!=”;
ALKMaps.Filter.Comparison.LESS_THAN = “<”;
ALKMaps.Filter.Comparison.GREATER_THAN = “>”;
ALKMaps.Filter.Comparison.LESS_THAN_OR_EQUAL_TO = “<=”;
ALKMaps.Filter.Comparison.GREATER_THAN_OR_EQUAL_TO = “>=”;
ALKMaps.Filter.Comparison.BETWEEN = “..”;
ALKMaps.Filter.Comparison.LIKE = “~”;

property

{String} name of the context property to compare

value

{Number} or {String} comparison value for binary comparisons. In the case of a String, this can be a combination of text and propertyNames in the form “literal ${propertyName}”

matchCase

{Boolean} Force case sensitive searches for EQUAL_TO and NOT_EQUAL_TO comparisons. The Filter Encoding 1.1 specification added a matchCase attribute to ogc:PropertyIsEqualTo and ogc:PropertyIsNotEqualTo elements. This property will be serialized with those elements only if using the v1.1.0 filter format. However, when evaluating filters here, the matchCase property will always be respected (for EQUAL_TO and NOT_EQUAL_TO). Default is true.

lowerBoundary

{Number} or {String} lower boundary for between comparisons. In the case of a String, this can be a combination of text and propertyNames in the form “literal ${propertyName}”

upperBoundary

{Number} or {String} upper boundary for between comparisons. In the case of a String, this can be a combination of text and propertyNames in the form “literal ${propertyName}”

Constructor

ALKMaps.Filter.Comparison

Creates a comparison rule.

Parameters

options

{Object} An optional object with properties to set on the rule

Returns

{ALKMaps.Filter.Comparison}

Functions

evaluate

evaluate: function( context )

Evaluates this filter in a specific context.

Parameters

context

{Object} Context to use in evaluating the filter. If a vector feature is provided, the feature.attributes will be used as context.

Returns

{Boolean} The filter applies.

value2regex

value2regex: function( wildCard,
singleChar,
escapeChar )

Converts the value of this rule into a regular expression string, according to the wildcard characters specified. This method has to be called after instantiation of this class, if the value is not a regular expression already.

Parameters

wildCard	{Char} wildcard character in the above value, default is “*”
singleChar	{Char} single-character wildcard in the above value default is “.”
escapeChar	{Char} escape character in the above value, default is “!”

Returns

{String} regular expression string

regex2value

regex2value: function()

Convert the value of this rule from a regular expression string into an ogc literal string using a wildCard of *, a singleChar of ., and an escape of !. Leaves the value property unmodified.

Returns

{String} A string value.

clone

clone: function()

Clones this filter.

Returns

{ALKMaps.Filter.Comparison} Clone of this filter.