Package com.osohq.oso

Class Polar

java.lang.Object

com.osohq.oso.Polar

Direct Known Subclasses:

Oso

public class Polar
extends Object

Field Summary

Fields

Modifier and Type	Field	Description
protected Host	host

Constructor Summary

Constructors

Constructor	Description
Polar()

Method Summary

Modifier and Type	Method	Description
void	clearRules()	Clear the rules from the KB, but maintain all registered classes and calls.
void	loadFile(String filename)	Deprecated. loadFile(String) has been deprecated in favor of loadFiles(String[]) as of the 0.20 release.
void	loadFiles(String[] filenames)	Load Polar policy files.
void	loadFilesFromResources(String... filenames)	Load Polar policy files from resources.
void	loadStr(String str)	Load a Polar string into the KB (without filename).
void	loadStr(String str, String filename)	Load a Polar string into the KB (with filename).
static void	main(String[] args)
Query	query(Predicate query)	Query for a predicate.
Query	query(Predicate query, boolean acceptExpression)	Query for a predicate, optionally accepting expressions in the result.
Query	query(Predicate query, Map<String,Object> bindings, boolean acceptExpression)	Query for a predicate, applying bindings and optionally accepting the expression type as a result.
Query	query(String query)	Query for a predicate, parsing it first.
Query	query(String query, boolean acceptExpression)	Query for a predicate, parsing it first and optionally accepting an expression.
Query	query(String query, Map<String,Object> bindings)	Query for a predicate, parsing it first and applying bindings
Query	query(String query, Map<String,Object> bindings, boolean acceptExpression)	Query for a predicate, parsing it first, applying bindings and optionally accepting an expression.
Query	queryRule(String rule, Object... args)	Query for a rule.
Query	queryRule(String rule, Map<String,Object> bindings, Object... args)	Query for a rule.
boolean	queryRuleOnce(String rule, Object... args)	Query for a rule, and check if it has any results.
void	registerClass(Class<?> cls)	Register a Java class with Polar.
void	registerClass(Class<?> cls, String name)	Register a Java class with Polar using an alias.
void	registerConstant(Object value, String name)	Registers `value` as a Polar constant variable called `name`.
void	repl()	Start the Polar REPL.
void	repl(String[] files)	Load the given files and start the Polar REPL.

Methods inherited from class java.lang.Object

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

Field Details

host

protected Host host

Constructor Details

Polar

public Polar()
      throws Exceptions.OsoException

Throws:

Exceptions.OsoException

Method Details

clearRules

public void clearRules()
                throws Exceptions.OsoException

Clear the rules from the KB, but maintain all registered classes and calls.

Throws:

Exceptions.OsoException

loadFiles

public void loadFiles(String[] filenames)
               throws IOException,
Exceptions.OsoException

Load Polar policy files. File contents are loaded into a String and saved here, so changes to a file made after a call to loadFiles will not be recognized.

Throws:

Exceptions.PolarFileExtensionError - On incorrect file extension.

Exceptions.PolarFileNotFoundError - On nonexistent file.

Exceptions.InlineQueryFailedError - On a failed inline query.

IOException - If unable to open or read the file.

Exceptions.OsoException

loadFilesFromResources

public void loadFilesFromResources(String... filenames)
                            throws IOException,
Exceptions.OsoException

Load Polar policy files from resources. File contents are loaded into a String and saved here, so changes to a file made after a call to loadFiles will not be recognized.

Throws:

Exceptions.PolarFileExtensionError - On incorrect file extension.

Exceptions.PolarFileNotFoundError - On nonexistent file.

Exceptions.InlineQueryFailedError - On a failed inline query.

IOException - If unable to open or read the file.

Exceptions.OsoException

loadFile

@Deprecated
public void loadFile(String filename)
              throws IOException,
Exceptions.OsoException

Deprecated.

loadFile(String) has been deprecated in favor of loadFiles(String[]) as of the 0.20 release. Please see changelog for migration instructions: https://docs.osohq.com/project/changelogs/2021-09-15.html

Load a Polar policy file. File contents are loaded into a String and saved here, so changes to the file made after a call to loadFile will not be recognized.

Throws:

Exceptions.PolarFileExtensionError - On incorrect file extension.

Exceptions.PolarFileNotFoundError - On nonexistent file.

Exceptions.InlineQueryFailedError - On a failed inline query.

IOException - If unable to open or read the file.

Exceptions.OsoException

loadStr

public void loadStr(String str,
 String filename)
             throws Exceptions.OsoException

Load a Polar string into the KB (with filename).

Parameters:

str - Polar string to be loaded.

filename - Name of the source file.

Throws:

Exceptions.InlineQueryFailedError - On a failed inline query.

Exceptions.OsoException

loadStr

public void loadStr(String str)
             throws Exceptions.OsoException

Load a Polar string into the KB (without filename).

Parameters:

str - Polar string to be loaded.

Throws:

Exceptions.InlineQueryFailedError - On a failed inline query.

Exceptions.OsoException

query

public Query query(String query)
            throws Exceptions.OsoException

Query for a predicate, parsing it first.

Throws:

Exceptions.OsoException

query

public Query query(String query,
 boolean acceptExpression)
            throws Exceptions.OsoException

Query for a predicate, parsing it first and optionally accepting an expression.

Throws:

Exceptions.OsoException

query

public Query query(String query,
 Map<String,Object> bindings)
            throws Exceptions.OsoException

Query for a predicate, parsing it first and applying bindings

Throws:

Exceptions.OsoException

query

public Query query(String query,
 Map<String,Object> bindings,
 boolean acceptExpression)
            throws Exceptions.OsoException

Query for a predicate, parsing it first, applying bindings and optionally accepting an expression.

Throws:

Exceptions.OsoException

query

public Query query(Predicate query)
            throws Exceptions.OsoException

Query for a predicate.

Throws:

Exceptions.OsoException

query

public Query query(Predicate query,
 boolean acceptExpression)
            throws Exceptions.OsoException

Query for a predicate, optionally accepting expressions in the result.

Throws:

Exceptions.OsoException

query

public Query query(Predicate query,
 Map<String,Object> bindings,
 boolean acceptExpression)
            throws Exceptions.OsoException

Query for a predicate, applying bindings and optionally accepting the expression type as a result.

Parameters:

acceptExpression - Set to true to accept an Expression as a result from the VM.

Throws:

Exceptions.OsoException

queryRule

public Query queryRule(String rule,
 Object... args)
                throws Exceptions.OsoException

Query for a rule.

Parameters:

rule - Rule name, e.g. "f" for rule "f(x)".

args - Variable list of rule arguments.

Throws:

Exceptions.OsoException

queryRule

public Query queryRule(String rule,
 Map<String,Object> bindings,
 Object... args)
                throws Exceptions.OsoException

Query for a rule.

Parameters:

rule - Rule name, e.g. "f" for rule "f(x)".

args - Variable list of rule arguments.

Throws:

Exceptions.OsoException

queryRuleOnce

public boolean queryRuleOnce(String rule,
 Object... args)
                      throws Exceptions.OsoException

Query for a rule, and check if it has any results. Returns true if there are results, and false if not.

Parameters:

rule - Rule name, e.g. "f" for rule "f(x)".

args - Variable list of rule arguments.

Throws:

Exceptions.OsoException

repl

public void repl()
          throws Exceptions.OsoException,
IOException

Start the Polar REPL.

Throws:

Exceptions.OsoException

IOException

repl

public void repl(String[] files)
          throws Exceptions.OsoException,
IOException

Load the given files and start the Polar REPL.

Throws:

Exceptions.OsoException

IOException

main

public static void main(String[] args)
                 throws Exceptions.OsoException,
IOException

Throws:

Exceptions.OsoException

IOException

registerClass

public void registerClass(Class<?> cls)
                   throws Exceptions.DuplicateClassAliasError,
Exceptions.OsoException

Register a Java class with Polar.

Throws:

Exceptions.DuplicateClassAliasError

Exceptions.OsoException

registerClass

public void registerClass(Class<?> cls,
 String name)
                   throws Exceptions.DuplicateClassAliasError,
Exceptions.OsoException

Register a Java class with Polar using an alias.

Throws:

Exceptions.DuplicateClassAliasError

Exceptions.OsoException

registerConstant

public void registerConstant(Object value,
 String name)
                      throws Exceptions.OsoException

Registers `value` as a Polar constant variable called `name`.

Throws:

Exceptions.OsoException