Package org.apache.felix.utils.filter

Class FilterImpl

java.lang.Object

org.apache.felix.utils.filter.FilterImpl

All Implemented Interfaces:

org.osgi.framework.Filter

public class FilterImpl
extends Object
implements org.osgi.framework.Filter

This filter implementation is based on the official OSGi filter with additional support for the SUPERSET (>*) and SUBSET (<*) operators. This filter also has a few optimizations (cached transformation).

Nested Class Summary

Nested Classes

Modifier and Type	Class	Description
private static class	FilterImpl.CaseInsensitiveDictionary	This Dictionary is used for case-insensitive key lookup during filter evaluation.
private static class	FilterImpl.Parser	Parser class for OSGi filter strings.
private static class	FilterImpl.ServiceReferenceDictionary	This Dictionary is used for key lookup from a ServiceReference during filter evaluation.
private static class	FilterImpl.SetAccessibleAction

Field Summary

Fields

Modifier and Type	Field	Description
private static final int	AND
private static final int	APPROX
private final String	attr	filter attribute or null if operation AND, OR or NOT
private static final Class[]	constructorType
private final Object	converted	optim in case of version
private static final int	EQUAL
private String	filterString
private static final int	GREATER
private static final int	LESS
private static final int	NOT
private final int	op	filter operation
private static final int	OR
private static final int	PRESENT
private static final int	SUBSET
private static final int	SUBSTRING
private static final int	SUPERSET
private final Object	value	filter operands

Constructor Summary

Constructors

Constructor	Description
FilterImpl(int operation, String attr, Object value)

Method Summary

Modifier and Type	Method	Description
private static String	approxString(String input)	Map a string for an APPROX (~=) comparison.
private boolean	compare(int operation, Object value1, Object value2)
private boolean	compare_Boolean(int operation, boolean boolval, Object value2)
private boolean	compare_Byte(int operation, byte byteval, Object value2)
private boolean	compare_Character(int operation, char charval, Object value2)
private boolean	compare_Collection(int operation, Collection collection, Object value2)
private boolean	compare_Comparable(int operation, Comparable value1, Object value2)
private boolean	compare_Double(int operation, double doubleval, Object value2)
private boolean	compare_Float(int operation, float floatval, Object value2)
private boolean	compare_Integer(int operation, int intval, Object value2)
private boolean	compare_Long(int operation, long longval, Object value2)
private boolean	compare_ObjectArray(int operation, Object[] array, Object value2)
private boolean	compare_PrimitiveArray(int operation, Class type, Object primarray, Object value2)
private boolean	compare_Short(int operation, short shortval, Object value2)
private boolean	compare_String(int operation, String string, Object value2)
private boolean	compare_Unknown(int operation, Object value1, Object value2)
private static String	encodeValue(String value)	Encode the value string such that '(', '*', ')' and '\' are escaped.
boolean	equals(Object obj)	Compares this Filter to another Filter.
private Collection	getSet(Object value)
int	hashCode()	Returns the hashCode for this Filter.
boolean	match(Dictionary dictionary)	Filter using a Dictionary.
boolean	match(org.osgi.framework.ServiceReference reference)	Filter using a service's properties.
private boolean	match0(Dictionary properties)	Internal match routine.
private boolean	match0(Map properties)
boolean	matchCase(Dictionary dictionary)	Filter with case sensitivity using a Dictionary.
boolean	matchCase(Map map)	Filter using a Map.
boolean	matches(Map<String,?> map)	Filter using a Map.
static FilterImpl	newInstance(String filterString)	Constructs a FilterImpl object.
static FilterImpl	newInstance(String filterString, boolean ignoreCase)
private String	normalize()	Returns this Filter's normalized filter string.
String	toString()	Returns this Filter's filter string.

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, wait, wait, wait

Field Details

EQUAL

private static final int EQUAL

See Also:

• Constant Field Values

APPROX

private static final int APPROX

See Also:

• Constant Field Values

GREATER

private static final int GREATER

See Also:

• Constant Field Values

LESS

private static final int LESS

See Also:

• Constant Field Values

PRESENT

private static final int PRESENT

See Also:

• Constant Field Values

SUBSTRING

private static final int SUBSTRING

See Also:

• Constant Field Values

AND

private static final int AND

See Also:

• Constant Field Values

OR

private static final int OR

See Also:

• Constant Field Values

NOT

private static final int NOT

See Also:

• Constant Field Values

SUBSET

private static final int SUBSET

See Also:

• Constant Field Values

SUPERSET

private static final int SUPERSET

See Also:

• Constant Field Values

op

private final int op

filter operation

attr

private final String attr

filter attribute or null if operation AND, OR or NOT

value

private final Object value

filter operands

converted

private final Object converted

optim in case of version

filterString

private transient volatile String filterString

constructorType

private static final Class[] constructorType

Constructor Details

FilterImpl

FilterImpl(int operation,
 String attr,
 Object value)

Method Details

newInstance

public static FilterImpl newInstance(String filterString)
                              throws org.osgi.framework.InvalidSyntaxException

Constructs a FilterImpl object. This filter object may be used to match a ServiceReference or a Dictionary.

If the filter cannot be parsed, an InvalidSyntaxException will be thrown with a human readable message where the filter became unparsable.

Parameters:

filterString - the filter string.

Returns:

A new filter

Throws:

org.osgi.framework.InvalidSyntaxException - If the filter parameter contains an invalid filter string that cannot be parsed.

newInstance

public static FilterImpl newInstance(String filterString,
 boolean ignoreCase)
                              throws org.osgi.framework.InvalidSyntaxException

Throws:

org.osgi.framework.InvalidSyntaxException

match

public boolean match(org.osgi.framework.ServiceReference reference)

Filter using a service's properties.

This Filter is executed using the keys and values of the referenced service's properties. The keys are case insensitively matched with this Filter.

Specified by:

match in interface org.osgi.framework.Filter

Parameters:

reference - The reference to the service whose properties are used in the match.

Returns:

true if the service's properties match this Filter; false otherwise.

match

public boolean match(Dictionary dictionary)

Filter using a Dictionary. This Filter is executed using the specified Dictionary's keys and values. The keys are case insensitively matched with this Filter.

Specified by:

match in interface org.osgi.framework.Filter

Parameters:

dictionary - The Dictionary whose keys are used in the match.

Returns:

true if the Dictionary's keys and values match this filter; false otherwise.

Throws:

IllegalArgumentException - If dictionary contains case variants of the same key name.

matchCase

public boolean matchCase(Dictionary dictionary)

Filter with case sensitivity using a Dictionary. This Filter is executed using the specified Dictionary's keys and values. The keys are case sensitively matched with this Filter.

Specified by:

matchCase in interface org.osgi.framework.Filter

Parameters:

dictionary - The Dictionary whose keys are used in the match.

Returns:

true if the Dictionary's keys and values match this filter; false otherwise.

Since:

1.3

matchCase

public boolean matchCase(Map map)

Filter using a Map. This Filter is executed using the specified Map's keys and values. The keys are case insensitively matched with this Filter.

Parameters:

map - The Map whose keys are used in the match.

Returns:

true if the Map's keys and values match this filter; false otherwise.

Throws:

IllegalArgumentException - If map contains case variants of the same key name.

matches

public boolean matches(Map<String,?> map)

Filter using a Map. This Filter is executed using the specified Map's keys and values. The keys are looked up in a normal manner respecting case.

Specified by:

matches in interface org.osgi.framework.Filter

Parameters:

map - The Map whose key/value pairs are used in the match. Maps with null key or values are not supported. A null value is considered not present to the filter.

Returns:

true if the Map's values match this filter; false otherwise.

Since:

1.6

toString

public String toString()

Returns this Filter's filter string.

The filter string is normalized by removing whitespace which does not affect the meaning of the filter.

Specified by:

toString in interface org.osgi.framework.Filter

Overrides:

toString in class Object

Returns:

This Filter's filter string.

normalize

private String normalize()

Returns this Filter's normalized filter string.

The filter string is normalized by removing whitespace which does not affect the meaning of the filter.

Returns:

This Filter's filter string.

equals

public boolean equals(Object obj)

Compares this Filter to another Filter.

This implementation returns the result of calling this.toString().equals(obj.toString().

Specified by:

equals in interface org.osgi.framework.Filter

Overrides:

equals in class Object

Parameters:

obj - The object to compare against this Filter.

Returns:

If the other object is a Filter object, then returns the result of calling this.toString().equals(obj.toString(); false otherwise.

hashCode

public int hashCode()

Returns the hashCode for this Filter.

This implementation returns the result of calling this.toString().hashCode().

Specified by:

hashCode in interface org.osgi.framework.Filter

Overrides:

hashCode in class Object

Returns:

The hashCode of this Filter.

match0

private boolean match0(Dictionary properties)

Internal match routine. Dictionary parameter must support case-insensitive get.

Parameters:

properties - A dictionary whose keys are used in the match.

Returns:

If the Dictionary's keys match the filter, return true. Otherwise, return false.

match0

private boolean match0(Map properties)

encodeValue

private static String encodeValue(String value)

Encode the value string such that '(', '*', ')' and '\' are escaped.

Parameters:

value - unencoded value string.

Returns:

encoded value string.

getSet

private Collection getSet(Object value)

compare

private boolean compare(int operation,
 Object value1,
 Object value2)

compare_Collection

private boolean compare_Collection(int operation,
 Collection collection,
 Object value2)

compare_ObjectArray

private boolean compare_ObjectArray(int operation,
 Object[] array,
 Object value2)

compare_PrimitiveArray

private boolean compare_PrimitiveArray(int operation,
 Class type,
 Object primarray,
 Object value2)

compare_String

private boolean compare_String(int operation,
 String string,
 Object value2)

compare_Integer

private boolean compare_Integer(int operation,
 int intval,
 Object value2)

compare_Long

private boolean compare_Long(int operation,
 long longval,
 Object value2)

compare_Byte

private boolean compare_Byte(int operation,
 byte byteval,
 Object value2)

compare_Short

private boolean compare_Short(int operation,
 short shortval,
 Object value2)

compare_Character

private boolean compare_Character(int operation,
 char charval,
 Object value2)

compare_Boolean

private boolean compare_Boolean(int operation,
 boolean boolval,
 Object value2)

compare_Float

private boolean compare_Float(int operation,
 float floatval,
 Object value2)

compare_Double

private boolean compare_Double(int operation,
 double doubleval,
 Object value2)

compare_Comparable

private boolean compare_Comparable(int operation,
 Comparable value1,
 Object value2)

compare_Unknown

private boolean compare_Unknown(int operation,
 Object value1,
 Object value2)

approxString

private static String approxString(String input)

Map a string for an APPROX (~=) comparison. This implementation removes white spaces. This is the minimum implementation allowed by the OSGi spec.

Parameters:

input - Input string.

Returns:

String ready for APPROX comparison.