| Rule.java |
/*
* GeoTools - The Open Source Java GIS Toolkit
* http://geotools.org
*
* (C) 2002-2008, Open Source Geospatial Foundation (OSGeo)
*
* This library is free software; you can redistribute it and/or
* modify it under the terms of the GNU Lesser General Public
* License as published by the Free Software Foundation;
* version 2.1 of the License.
*
* This library is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* Lesser General Public License for more details.
*/
package org.geotools.styling;
import java.util.List;
import org.opengis.filter.Filter;
import org.opengis.metadata.citation.OnLineResource;
import org.opengis.style.GraphicLegend;
/**
* A rule is used to attach a condition to, and group, the individual
* symbolizers used for rendering. The Title and Abstract describe the rule
* and may be used to generate a legend, as may the LegendGraphic. The Filter,
* ElseFilter, MinScale and MaxScale elements allow the selection of features
* and rendering scales for a rule. The scale selection works as follows.
* When a map is to be rendered, the scale denominator is computed and all
* rules in all UserStyles that have a scale outside of the request range are
* dropped. (This also includes Rules that have an ElseFilter.) An
* ElseFilter is simply an ELSE condition to the conditions (Filters) of all
* other rules in the same UserStyle. The exact meaning of the ElseFilter is
* determined after Rules have been eliminated for not fitting the rendering
* scale. This definition of the behaviour of ElseFilters may seem a little
* strange, but it allows for scale-dependent and scale-independent ELSE
* conditions. For the Filter, only SqlExpression is available for
* specification, but this is a hack and should be replaced with Filter as
* defined in WFS. A missing Filter element means "always true". If a set of
* Rules has no ElseFilters, then some features may not be rendered (which is
* presumably the desired behavior). The Scales are actually scale
* denominators (as double floats), so "10e6" would be interpreted as 1:10M. A
* missing MinScale means there is no lower bound to the scale-denominator
* range (lim[x->0+](x)), and a missing MaxScale means there is no upper bound
* (infinity). 0.28mm
*
* <p>
* The details of this object are taken from the <a
* href="https://portal.opengeospatial.org/files/?artifact_id=1188"> OGC
* Styled-Layer Descriptor Report (OGC 02-070) version 1.0.0.</a>:
* <pre><code>
* <xsd:element name="Rule">
* <xsd:annotation>
* <xsd:documentation>
* A Rule is used to attach property/scale conditions to and group
* the individual symbolizers used for rendering.
* </xsd:documentation>
* </xsd:annotation>
* <xsd:complexType>
* <xsd:sequence>
* <xsd:element ref="sld:Name" minOccurs="0"/>
* <xsd:element ref="sld:Title" minOccurs="0"/>
* <xsd:element ref="sld:Abstract" minOccurs="0"/>
* <xsd:element ref="sld:LegendGraphic" minOccurs="0"/>
* <xsd:choice minOccurs="0">
* <xsd:element ref="ogc:Filter"/>
* <xsd:element ref="sld:ElseFilter"/>
* </xsd:choice>
* <xsd:element ref="sld:MinScaleDenominator" minOccurs="0"/>
* <xsd:element ref="sld:MaxScaleDenominator" minOccurs="0"/>
* <xsd:element ref="sld:Symbolizer" maxOccurs="unbounded"/>
* </xsd:sequence>
* </xsd:complexType>
* </xsd:element>
* </code></pre>
* </p>
* @source $URL: http://svn.osgeo.org/geotools/tags/2.7-M3/modules/library/api/src/main/java/org/geotools/styling/Rule.java $
*/
public interface Rule extends org.opengis.style.Rule {
/**
* Sets the name of the rule.
*
* @param name The name of the rule. This provides a way to identify a
* rule.
*/
void setName(String name);
/**
* Description for this rule.
* @return Human readable description for use in user interfaces
* @since 2.5.x
*/
Description getDescription();
/**
* Description for this rule.
* @param description Human readable title and abstract.
*/
void setDescription(org.opengis.style.Description description);
/**
* Gets the title.
*
* @return The title of the rule. This is a brief, human readable,
* description of the rule.
* @deprecated use getDescription().getTitle().getString()
*/
String getTitle();
/**
* Sets the title.
*
* @param title The title of the rule. This is a brief, human readable,
* description of the rule.
*/
void setTitle(String title);
/**
* Gets the abstract text for the rule.
*
* @return The abstract text, a more detailed description of the rule.
* @deprecated use getDescription().getAbstract().getString()
*/
String getAbstract();
/**
* Sets the abstract text for the rule.
*
* @param abstractStr The abstract text, a more detailed description of the
* rule.
* @deprecated use getDescription().setAbstract()
*/
void setAbstract(String abstractStr);
/**
* The smallest value for scale denominator at which symbolizers contained
* by this rule should be applied.
*
* @param scale The smallest (inclusive) denominator value that this rule
* will be active for.
*/
void setMinScaleDenominator(double scale);
/**
* The largest value for scale denominator at which symbolizers contained
* by this rule should be applied.
*
* @param scale The largest (exclusive) denominator value that this rule
* will be active for.
*/
void setMaxScaleDenominator(double scale);
/**
* This is the filter used to select content for this rule to display
* <p>
* @return Filter use to select content for this rule to display, Filter.INCLUDES to include all content; of isElseFilter for null
*/
Filter getFilter();
/**
* Filter used to select content for this rule to display.
* <p>
* This filter is only consulted if isElseFilter is false.
*
* @param filter
*/
void setFilter(Filter filter);
/**
* @deprecated Please use isElseFilter
*/
boolean hasElseFilter();
/**
*
* @param isElse if this rule should accept any features not already rendered
*/
void setElseFilter(boolean isElse);
/**
* @param isElse
* @deprecaated Please use setElseFilter( isElse );
*/
void setIsElseFilter( boolean isElse );
/**
*
*/
public GraphicLegend getLegend();
/**
* @param legend
*/
void setLegend( GraphicLegend legend);
/**
* A set of equivalent Graphics in different formats which can be used as a
* legend against features stylized by the symbolizers in this rule.
*
* @return A single Graphic matching the getLegend()
* @deprecated Please use getLegend
*/
Graphic[] getLegendGraphic();
/**
* A set of equivalent Graphics in different formats which can be used as a
* legend against features stylized by the symbolizers in this rule.
*
* @param graphics Graphic objects; the first one will be used to configure getGraphicLenged
* @deprecated Please use setLegend
*/
void setLegendGraphic(Graphic[] graphics);
/**
* The symbolizers contain the actual styling information for different
* geometry types. A single feature may be rendered by more than one of
* the symbolizers returned by this method. It is important that the
* symbolizers be applied in the order in which they are returned if the
* end result is to be as intended. All symbolizers should be applied to
* all features which make it through the filters in this rule regardless
* of the features' geometry. For example, a polygon symbolizer should be
* applied to line geometries and even points. If this is not the desired
* beaviour, ensure that either the filters block inappropriate features
* or that the FeatureTypeStyler which contains this rule has its
* FeatureTypeName or SemanticTypeIdentifier set appropriately.
*
* @return An array of symbolizers to be applied, in sequence, to all of
* the features addressed by the FeatureTypeStyler which contains
* this rule.
* @param Please use symbolizers().toArray( new Symbolizer[0] )
*/
Symbolizer[] getSymbolizers();
/**
* Symbolizers used, in order, to portray the features selected by this rule.
* <p>
* Please note that this list may be modified direct.
*/
List<org.geotools.styling.Symbolizer> symbolizers();
/**
* The symbolizers contain the actual styling information for different
* geometry types. A single feature may be rendered by more than one of
* the symbolizers returned by this method. It is important that the
* symbolizers be applied in the order in which they are returned if the
* end result is to be as intended. All symbolizers should be applied to
* all features which make it through the filters in this rule regardless
* of the features' geometry. For example, a polygon symbolizer should be
* applied to line geometries and even points. If this is not the desired
* beaviour, ensure that either the filters block inappropriate features
* or that the FeatureTypeStyler which contains this rule has its
* FeatureTypeName or SemanticTypeIdentifier set appropriately.
*
* @param symbolizers An array of symbolizers to be applied, in sequence,
* to all of the features addressed by the FeatureTypeStyler which
* contains this rule.
* @deprecated please use symbolizers().addAll()
*/
void setSymbolizers(Symbolizer[] symbolizers);
/**
* @return Location where this style is defined; file or server; or null if unknown
*/
public OnLineResource getOnlineResource();
/**
* @param resource Indicates where this style is defined
*/
void setOnlineResource(OnLineResource online);
/**
* Used to traverse the style data structure.
* @param visitor
*/
void accept(org.geotools.styling.StyleVisitor visitor);
}