com.izforge.izpack.rules
Class RulesEngine

java.lang.Object
  com.izforge.izpack.rules.RulesEngine

All Implemented Interfaces:

java.io.Serializable

public class RulesEngine
extends java.lang.Object
implements java.io.Serializable

The rules engine class is the central point for checking conditions

Author:

Dennis Reil, created: 09.11.2006, 13:48:39

See Also:

Serialized Form

Field Summary

protected static java.util.Map<java.lang.String,Condition>	conditionsmap
protected IXMLElement	conditionsspec
protected static AutomatedInstallData	installdata
protected java.util.Map<java.lang.String,java.lang.String>	optionalpackconditions
protected java.util.Map<java.lang.String,java.lang.String>	packconditions
protected java.util.Map<java.lang.String,java.lang.String>	panelconditions
private static long	serialVersionUID

Constructor Summary

private	RulesEngine()
	RulesEngine(IXMLElement conditionsspecxml, AutomatedInstallData installdata)
	RulesEngine(java.util.Map<java.lang.String,Condition> rules, AutomatedInstallData installdata)

Method Summary

void	addCondition(Condition condition)
static Condition	analyzeCondition(IXMLElement condition)
boolean	canInstallPack(java.lang.String packid, java.util.Properties variables) Is the installation of a pack possible?
boolean	canInstallPackOptional(java.lang.String packid, java.util.Properties variables) Is an optional installation of a pack possible if the condition is not met?
boolean	canShowPanel(java.lang.String panelid, java.util.Properties variables) Can a panel be shown?
protected boolean	checkAttribute(java.lang.String val, java.lang.String attribute, java.lang.String element) Checks if an attribute for an xmlelement is set.
private static void	createBuiltinOsCondition(java.lang.String osVersionField, java.lang.String conditionId)
static IXMLElement	createConditionElement(Condition condition, IXMLElement root)
static Condition	getCondition(java.lang.String id)
protected static Condition	getConditionByExpr(java.lang.StringBuffer conditionexpr)
private static java.lang.Class<Condition>	getConditionClass(java.lang.String conditionClassName)
java.lang.String[]	getKnownConditionIds() Returns the current known condition ids.
private void	init() initializes builtin conditions
boolean	isConditionTrue(Condition cond)
boolean	isConditionTrue(Condition cond, java.util.Properties variables)
boolean	isConditionTrue(java.lang.String id)
boolean	isConditionTrue(java.lang.String id, java.util.Properties variables)
private static void	loadStaticConditions()
protected void	readConditions() Read the spec for the conditions
void	writeRulesXML(java.io.OutputStream out)

Methods inherited from class java.lang.Object

clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

Field Detail

serialVersionUID

private static final long serialVersionUID

See Also:

Constant Field Values

panelconditions

protected java.util.Map<java.lang.String,java.lang.String> panelconditions

packconditions

protected java.util.Map<java.lang.String,java.lang.String> packconditions

optionalpackconditions

protected java.util.Map<java.lang.String,java.lang.String> optionalpackconditions

conditionsspec

protected IXMLElement conditionsspec

conditionsmap

protected static java.util.Map<java.lang.String,Condition> conditionsmap

installdata

protected static AutomatedInstallData installdata

Constructor Detail

RulesEngine

private RulesEngine()

RulesEngine

public RulesEngine(IXMLElement conditionsspecxml,
                   AutomatedInstallData installdata)

RulesEngine

public RulesEngine(java.util.Map<java.lang.String,Condition> rules,
                   AutomatedInstallData installdata)

Method Detail

loadStaticConditions

private static void loadStaticConditions()

init

private void init()

initializes builtin conditions

createBuiltinOsCondition

private static void createBuiltinOsCondition(java.lang.String osVersionField,
                                             java.lang.String conditionId)

getKnownConditionIds

public java.lang.String[] getKnownConditionIds()

Returns the current known condition ids.

Returns:

checkAttribute

protected boolean checkAttribute(java.lang.String val,
                                 java.lang.String attribute,
                                 java.lang.String element)

Checks if an attribute for an xmlelement is set.

Parameters:

val - value of attribute to check

attribute - the attribute which is checked

element - the element

Returns:

true value was set false no value was set

analyzeCondition

public static Condition analyzeCondition(IXMLElement condition)

getConditionClass

private static java.lang.Class<Condition> getConditionClass(java.lang.String conditionClassName)

readConditions

protected void readConditions()

Read the spec for the conditions

getCondition

public static Condition getCondition(java.lang.String id)

getConditionByExpr

protected static Condition getConditionByExpr(java.lang.StringBuffer conditionexpr)

isConditionTrue

public boolean isConditionTrue(java.lang.String id,
                               java.util.Properties variables)

isConditionTrue

public boolean isConditionTrue(Condition cond,
                               java.util.Properties variables)

isConditionTrue

public boolean isConditionTrue(java.lang.String id)

isConditionTrue

public boolean isConditionTrue(Condition cond)

canShowPanel

public boolean canShowPanel(java.lang.String panelid,
                            java.util.Properties variables)

Can a panel be shown?

Parameters:

panelid - - id of the panel, which should be shown

variables - - the variables

Returns:

true - there is no condition or condition is met false - there is a condition and the condition was not met

canInstallPack

public boolean canInstallPack(java.lang.String packid,
                              java.util.Properties variables)

Is the installation of a pack possible?

Parameters:

packid -

variables -

Returns:

true - there is no condition or condition is met false - there is a condition and the condition was not met

canInstallPackOptional

public boolean canInstallPackOptional(java.lang.String packid,
                                      java.util.Properties variables)

Is an optional installation of a pack possible if the condition is not met?

Parameters:

packid -

variables -

Returns:

addCondition

public void addCondition(Condition condition)

Parameters:

condition -

writeRulesXML

public void writeRulesXML(java.io.OutputStream out)

createConditionElement

public static IXMLElement createConditionElement(Condition condition,
                                                 IXMLElement root)