Class RuleFactory

java.lang.Object

org.apache.log4j.rule.RuleFactory

public final class RuleFactory
extends Object

A Factory class which, given a string representation of the rule, and a context stack, will return a Rule ready for evaluation against events. If an operator is requested that isn't supported, an IllegalArgumentException is thrown.

Field Summary

Fields

Modifier and Type	Field	Description
private static final String	AND_RULE	AND operator literal.
private static final String	EQUALS_RULE	Equality operator literal.
private static final String	EXISTS_RULE	Exists operator literal.
private static final RuleFactory	FACTORY	Singleton instance.
private static final String	GREATER_THAN_EQUALS_RULE	Greater than or equal operator literal.
private static final String	GREATER_THAN_RULE	Greater than operator literal.
private static final String	LESS_THAN_EQUALS_RULE	Less than or equal operator literal.
private static final String	LESS_THAN_RULE	Less than operator literal.
private static final String	LIKE_RULE	Like operator literal.
private static final String	NOT_EQUALS_RULE	Inequality operator literal.
private static final String	NOT_RULE	NOT operator literal.
private static final String	OR_RULE	OR operator literal.
private static final String	PARTIAL_TEXT_MATCH_RULE	Partial match operator literal.
private static final Collection	RULES	Rules.

Constructor Summary

Constructors

Modifier	Constructor	Description
private	RuleFactory()	Create instance.

Method Summary

Modifier and Type	Method	Description
static RuleFactory	getInstance()	Get instance.
Rule	getRule(String symbol, Stack stack)	Create rule from applying operator to stack.
boolean	isRule(String symbol)	Determine if specified string is a known operator.

Methods inherited from class Object

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

Field Details

FACTORY

private static final RuleFactory FACTORY

Singleton instance.

RULES

private static final Collection RULES

Rules.

AND_RULE

private static final String AND_RULE

AND operator literal.

See Also:

• Constant Field Values

OR_RULE

private static final String OR_RULE

OR operator literal.

See Also:

• Constant Field Values

NOT_RULE

private static final String NOT_RULE

NOT operator literal.

See Also:

• Constant Field Values

NOT_EQUALS_RULE

private static final String NOT_EQUALS_RULE

Inequality operator literal.

See Also:

• Constant Field Values

EQUALS_RULE

private static final String EQUALS_RULE

Equality operator literal.

See Also:

• Constant Field Values

PARTIAL_TEXT_MATCH_RULE

private static final String PARTIAL_TEXT_MATCH_RULE

Partial match operator literal.

See Also:

• Constant Field Values

LIKE_RULE

private static final String LIKE_RULE

Like operator literal.

See Also:

• Constant Field Values

EXISTS_RULE

private static final String EXISTS_RULE

Exists operator literal.

See Also:

• Constant Field Values

LESS_THAN_RULE

private static final String LESS_THAN_RULE

Less than operator literal.

See Also:

• Constant Field Values

GREATER_THAN_RULE

private static final String GREATER_THAN_RULE

Greater than operator literal.

See Also:

• Constant Field Values

LESS_THAN_EQUALS_RULE

private static final String LESS_THAN_EQUALS_RULE

Less than or equal operator literal.

See Also:

• Constant Field Values

GREATER_THAN_EQUALS_RULE

private static final String GREATER_THAN_EQUALS_RULE

Greater than or equal operator literal.

See Also:

• Constant Field Values

Constructor Details

RuleFactory

private RuleFactory()

Create instance.

Method Details

getInstance

public static RuleFactory getInstance()

Get instance.

Returns:

rule factory instance.

isRule

public boolean isRule(String symbol)

Determine if specified string is a known operator.

Parameters:

symbol - string

Returns:

true if string is a known operator

getRule

public Rule getRule(String symbol,
 Stack stack)

Create rule from applying operator to stack.

Parameters:

symbol - symbol

stack - stack

Returns:

new instance