This is a collection of thoughts on AIDA Styles and on their use in the new plotter.
This is an object that can save and retrieve styles from a store (xml file on disk, database table). The basic xml style definition is the AIDA one. Next to the style itself we also identified the need to define Style Rules that should also be saved/retrieved to/from the store:
<styleStore>
<styles>
<style>
.......
<rules>
<rule>
.......
</rule>
</rules>
</style>
</styles>
</styleStore>
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Multiple stores might be loaded at once: System Store, Personal Store, Group Store, Experiment Store. Their information is grouped and managed by a Style Registry
It should be possible to define rules on how to attach a style to a particular plot object. Multiple rules might be applied to a given style. It should be possible to apply rules to:
A style registry combines the styles and rules from different style stores and provides the right set of styles (with the appropriate Style Order) for a given plot object.
We have to define the order in which the styles are applied to an object:
GUI front end for viewing and editing individual styles or combinations of styles.
We already have a first version of the style editor. We need to add the possibility to view the information contained in a style registry, i.e. the chain of styles contributing to a given object and the set of rules that have contributed to it.
Let's leave Style Store out of this discussion just for the moment.
So Style Registry is created and is getting populated by (or just acts as a manager/façade for) the Style Stores, but it has access to Style/Rules information.
Just before object is plotted/printed and we know the object's path in a Tree, object's type, order of the object in particular IPlotterRegion, etc. All this information is used to query the Style Registry and create a cumulative IPlotterStyle for the implicit parameters.
Information that we need:
If any styles are passed explicitly to the plotter, this implicit cumulative style will be set as parent (or merged in as a lower priority Style).
I've set three interfaces that might do the job (below), have a look.
IPlotterStore in StyleRegistry is identified by a name (storeName). Store names have to be unique.
Also StyleRegistry can manage the Categories: list of all available keys and set of current values.
package hep.aida.ref.plotter.style.registry;
import hep.aida.IPlotterStyle;
public interface IStyleRegistry {
// To work with Style Stores
String[] getAvailableStoreNames();
IStyleStore getStore(String storeName);
// To work with categories, this can be a separate service
// Available category keys are filled from Rules of all available Stores
String[] getAvailableCategoryKeys();
String[] getAvailableCategoryValues(String categoryKey);
String getCategoryCurrentValue(String categoryKey);
void setCategoryCurrentValue(String categoryKey, String categoryValue);
// Following methods are used to obtain cumulative IPlotterStyle
// for particular plotter, region, object, action, and (possibly) categories
IPlotterStyle getStyleForState(IPlotterState state);
}
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package hep.aida.ref.plotter.style.registry;
import hep.aida.IPlotterStyle;
/**
* This interface can be implemented as "In-Memory" copy of persistent
* facility, or as keeping live connections and committing any change
* immediately.
*/
public interface IStyleStore {
// Key for AIDA type of object that the Style is going to be used with
public static String STYLE_PREVIEW_TYPE = "STYLE_PREVIEW_TYPE";
// Key for Style name
public static String STYLE_STORE_NAME = "STYLE_STORE_NAME";
String getStoreName();
String getStoreType();
boolean isReadOnly();
// Manage Styles
boolean hasStyle(String styleName);
void addStyle(String styleName, IPlotterStyle style);
void addStyle(String styleName, IPlotterStyle style, IStyleRule rule);
IPlotterStyle getStyle(String styleName);
/**
* Remove Style and Rule associated with it from the Store
*/
IPlotterStyle removeStyle(String styleName);
String[] getAllStyleNames();
// Create new Rule for this Store - Store acts as a Rule Factory
IStyleRule createRule();
// Manage Rules - only one rule per style is allowed
IStyleRule getRuleForStyle(String styleName);
void setRuleForStyle(String styleName, IStyleRule rule);
void removeRuleForStyle(String styleName);
/**
* Write all information from Store to the undelying persistent
* facility: XML file, database, etc.
*/
void commit();
/**
* Close all connections and free all resources.
* Store is not usable after this method is executed.
*/
void close();
}
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Style Rule contains expression that is evaluated at run-time
package hep.aida.ref.plotter.style.registry;
public interface IStyleRule {
public static String PATH = "Path";
public static String OBJECT = "Object";
public static String OBJECTTYPE = "ObjectType";
public static String NULL = "Null";
public static String ATTRIBUTE = "attribute(\"\")";
public static String OVERLAYINDEX = "OverlayIndex";
public static String OVERLAYTOTAL = "OverlayTotal";
public static String REGIONINDEX = "RegionIndex";
public static String REGIONTOTAL = "RegionTotal";
String getDescription();
// Evaluates the Rule
boolean ruleApplies(IPlotterState state);
}
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package hep.aida.ref.plotter.style.registry;
/**
* This object encapsulates information about relevant
* IPlotterRegion, object, and actions.
* It is used for obtaining implicit IPlotterStyle
*/
import java.util.Map;
public interface IPlotterState {
static String ATTRIBUTE_KEY_PREFIX = "IPlotterState";
Object getObject();
String getObjectPath();
int getOverlayIndex();
int getOverlayTotal();
int getRegionIndex();
int getRegionTotal();
String getAttribute(String key);
Map getAttributes();
void clear();
}
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