com.bea.p13n.controls.rules
Interface RulesExecutorControl

All Superinterfaces:

weblogic.jws.control.Control, com.bea.control.Control, Serializable

public interface RulesExecutorControl

extends weblogic.jws.control.Control

This control defines the API for executing named rule sets and/or rules using the underlying BEA rules engine. The ruleset, rule, and filters are all set as attributes on the control and may be edited in the control property set GUI. It is assumed the user knows which rules exist in the rules repository. Use the RulesManagerControl to list, access, or manage these rules.

Rulesets are stored in the Portal data repository and are updated using data sync. They are loaded automatically when the server starts. To facilitate loading rulesets via data sync, simply place the ruleset file (generally ends with .rls) into the application's META-INF/data directory. For better organization, you may place the rulesets into a subdirectory, such as META-INF/data/rulesets. The ruleset uri is relative to the META-INF/data directory and looks something like this: '/rulesets/MyRule.rls'

There are two ways to configure this control, depending on whether you intend to invoke the control multiple times. For a single control invocation, configure the control properties, then use the evaluateRule() and evaluateRuleset() methods. If you intend to execute multiple rulesets within the same page, use the evaluate() and evaluateAll() methods, optionally overriding the control filter properties with the set*() methods.

Once the rules engine has finished executing, several objects will exist in working memory, including those that were originally input to the evaluate methods. Specifying the filter class names allows you to view only those classes in the results you're interested in. Those filtering parameters may be set on the control properties, or set programatically. If they are not set, the results are returned as-is, without filtering. For more information on filtering results, see the javadocs for com.bea.p13n.rules.manager.RuleResultClassFilter and the javadocs below on the 'setDoFilter' method.
Control properties:

• rulesetUri (OPTIONAL) URI of the ruleset to use. This is relative to the application's META-INF/data directory. Use the RulesMangerControl to list rulesets and rules.
• ruleName (OPTIONAL) Name of the rule to use. Must be contained within the ruleset URI specified for this control.
• filterResults (OPTIONAL) Whether to filter the results after the rule(s) have been evaluated. If false, all objects remaining in working memory will be returned.
• filterClassName (OPTIONAL) Filter rule results on this class. Enter class name (eg, java.lang.String). If left empty, results will not be filtered. Specify either this or the 'filterClassNames' but not both. The 'filterResults' property must be set to true to use this property.
• filterClassNames (OPTIONAL) Filter rule results on these classes. Enter as a comma-separated list of class names. Specify either this or the 'filterClassName' but not both. The 'filterResults' property must be set to true to use this property.
• filterRuleName (OPTIONAL) Filter rule results on the rule that produced the result. If this is left empty, then results from all rules will be returned. Otherwise, results from only this rule will be returned. This filter is applied in conjunction with the Class filters, if those are specified. The 'filterResults' property must be set to true to use this property.

Security requirements: none

Nested Class Summary

Nested classes inherited from class com.bea.control.Control

com.bea.control.Control.Callback

Method Summary

Iterator	evaluate(String rulesetUri, String ruleName, Object[] inputObjects) Applies a named rule in the ruleset uri to the set of objects provided by the caller and returns an iterator over the resultant set of objects.
Iterator	evaluateAll(String rulesetUri, Object[] inputObjects) Applies all rules within the named rule set to the set of objects provided by the caller and returns an iterator over the resultant set of objects.
Iterator	evaluateRule(Object[] inputObjects) Applies a named rule to the set of objects provided by the caller and returns an iterator over the resultant set of objects.
Iterator	evaluateRuleSet(Object[] inputObjects) Applies all rules within the named rule set to the set of objects provided by the caller and returns an iterator over the resultant set of objects.
void	setDoFilter(boolean doFilter) Toggle the filtering option, overriding the control property setting.
void	setFilterClass(String className) Set the Java Class on which the rules results will be filtered.
void	setFilterClasses(String[] classNames) Set the array of Java Class names on which the rules results will be filtered.
void	setFilterRuleName(String ruleName) Set the rule name for which the filter will be applied.

Method Detail

evaluate

public Iterator evaluate(String rulesetUri,
                         String ruleName,
                         Object[] inputObjects)
                  throws IllegalArgumentException,
                         ApplicationException,
                         P13nControlException

Applies a named rule in the ruleset uri to the set of objects provided by the caller and returns an iterator over the resultant set of objects.

Use this method for multiple invocations of the same control, where you'd like to execute different rulesets/rules each time.

Parameters:

rulesetUri - Then URI of the ruleset containing the rule. This is relative to the application's META-INF/data directory and begins with '/'

ruleName - The name of the rule within the ruleset to execute.

inputObjects - The set of objects to which the rule is to be applied

Returns:

The set of objects which resulted from the application of the rule and optionally filtered.

Throws:

IllegalArgumentException - if ruleSetUri or ruleName are null or zero-length, or if inputObjects is null.

ApplicationException - if the rule set execution subsystem is unable to execute the rule.

P13nControlException - if remote exceptions are encountered.

evaluateAll

public Iterator evaluateAll(String rulesetUri,
                            Object[] inputObjects)
                     throws IllegalArgumentException,
                            ApplicationException,
                            P13nControlException

Applies all rules within the named rule set to the set of objects provided by the caller and returns an iterator over the resultant set of objects.

Use this method for multiple invocations of the same control, where you'd like to execute different rulesets each time.

Parameters:

rulesetUri - Then URI of the ruleset containing the rule. This is relative to the application's META-INF/data directory and begins with '/'

inputObjects - The set of objects to which the rules are to be applied.

Returns:

The set of objects which resulted from the application of the rules and optionally filtered

Throws:

IllegalArgumentException - if ruleSetUri is null or zero-length, or if inputObjects is null.

ApplicationException - if the rule set execution subsystem is unable to execute the rule set.

P13nControlException - if remote errors are encountered.

evaluateRule

public Iterator evaluateRule(Object[] inputObjects)
                      throws IllegalArgumentException,
                             ApplicationException,
                             P13nControlException

Applies a named rule to the set of objects provided by the caller and returns an iterator over the resultant set of objects. Both the ruleset URI and rule name must be specified on the control properties.

Use this method for a single invocation of the control, where all properties have been configured on the control.

Parameters:

inputObjects - The set of objects to which the rule is to be applied

Returns:

The set of objects which resulted from the application of the rule and optionally filtered.

Throws:

IllegalArgumentException - if ruleSetUri or ruleName are null or zero-length, or if inputObjects is null.

ApplicationException - if the rule set execution subsystem is unable to execute the rule.

P13nControlException - if remote exceptions are encountered.

evaluateRuleSet

public Iterator evaluateRuleSet(Object[] inputObjects)
                         throws IllegalArgumentException,
                                ApplicationException,
                                P13nControlException

Applies all rules within the named rule set to the set of objects provided by the caller and returns an iterator over the resultant set of objects. The ruleset URI must be specified on the control properties.

Use this method for a single invocation of the control, where all properties have been configured on the control.

Parameters:

inputObjects - The set of objects to which the rules are to be applied.

Returns:

The set of objects which resulted from the application of the rules and optionally filtered

Throws:

IllegalArgumentException - if ruleSetUri is null or zero-length, or if inputObjects is null.

ApplicationException - if the rule set execution subsystem is unable to execute the rule set.

P13nControlException - if remote errors are encountered.

setDoFilter

public void setDoFilter(boolean doFilter)

Toggle the filtering option, overriding the control property setting. When filtering, you must specify either the filterClass or the filterClasses. Specifying the filter rule name is optional (see javadocs above).

When the rules engine has finished executing, its working memory will always include the input objects as well as any new objects created when the rule(s) fired. These new objects are of type 'com.bea.p13n.rules.Result' and you can use that API to get at the underlying object.

Use this method for multiple invocations of the same control using different filter rules. Otherwise, this property may be set on the control and applied to all invocations of the control

This method overrides the 'filterRuleName' property of this control and allows multiple invocations of the same control using different filters. It automatically sets the 'filterResults' parameter to true.

Parameters:

doFilter - Whether or not to filter the rule results.

setFilterClass

public void setFilterClass(String className)
                    throws ClassNotFoundException

Set the Java Class on which the rules results will be filtered. Once the rules engine has finished executing, several objects will exist in working memory, including those that were originally input to the evaluate methods. Specifying the filter class allows you to view only those classes in the results you're interested in.

This method overrides the 'filterClass' property of this control and allows multiple invocations of the same control using different filters. It automatically sets the 'filterResults' parameter to true.

Specify either this or the filterClasses, but not both.

Use this method for multiple invocations of the same control using different filter classes. Otherwise, this property may be set on the control and applied to all invocations of the control

Throws:

ClassNotFoundException - if the name class cannot be instantiated

setFilterClasses

public void setFilterClasses(String[] classNames)
                      throws ClassNotFoundException

Set the array of Java Class names on which the rules results will be filtered. Once the rules engine has finished executing, several objects will exist in working memory, including those that were originally input to the evaluate methods. Specifying the filter class names allows you to view only those classes in the results you're interested in.

This method overrides the 'filterClasses' property of this control and allows multiple invocations of the same control using different filters. It automatically sets the 'filterResults' parameter to true.

Specify either this or the filterClass, but not both.

Use this method for multiple invocations of the same control using different filter classes. Otherwise, this property may be set on the control and applied to all invocations of the control.

Throws:

ClassNotFoundException - if the name class cannot be instantiated

setFilterRuleName

public void setFilterRuleName(String ruleName)

Set the rule name for which the filter will be applied. Once the rules engine has finished executing, several objects will exist in working memory, including those that were originally input to the evaluate methods. You may be interested in the results of only one particular rule. If no rule name is specified, the filter is applied to the results of all rule executions.

Use this method for multiple invocations of the same control using different filter rules. Otherwise, this property may be set on the control and applied to all invocations of the control

This method overrides the 'filterRuleName' property of this control and allows multiple invocations of the same control using different filters. It automatically sets the 'filterResults' parameter to true.

Parameters:

ruleName - The rule for which the filter will be applied.