org.apache.commons.discovery.tools
public class ManagedProperties extends Object
This class may disappear in the future, or be moved to another project..
Extend the concept of System properties to a hierarchical scheme based around class loaders. System properties are global in nature, so using them easily violates sound architectural and design principles for maintaining separation between components and runtime environments. Nevertheless, there is a need for properties broader in scope than class or class instance scope.
This class is one solution.
Manage properties according to a secure scheme similar to that used by classloaders:
ClassLoader
s are organized in a tree hierarchy.ClassLoader
has a reference
to a parent ClassLoader
.ClassLoader
er.ClassLoader
instance
ClassLoader
instance take precedence over all properties of the same name bound
to any decendent.
Just to confuse the issue, this is the default case.ClassLoader
instance may be overriden by (default or non-default) properties of
the same name bound to any decendent.
This is not a perfect solution, as it is possible that
different ClassLoader
s load different instances of
ScopedProperties
. The 'higher' this class is loaded
within the ClassLoader
hierarchy, the more usefull
it will be.
Method Summary | |
---|---|
static Properties | getProperties()
This is an expensive operation.
|
static String | getProperty(String propertyName)
Get value for property bound to the current thread context class loader.
|
static String | getProperty(String propertyName, String dephault)
Get value for property bound to the current thread context class loader.
|
static String | getProperty(ClassLoader classLoader, String propertyName)
Get value for property bound to the class loader.
|
static String | getProperty(ClassLoader classLoader, String propertyName, String dephault)
Get value for property bound to the class loader.
|
static Enumeration | propertyNames()
Return list of all property names. |
static void | setLog(Log _log) |
static void | setProperties(Map newProperties)
Set property values for Properties bound to the
current thread context class loader.
|
static void | setProperties(Map newProperties, boolean isDefault)
Set property values for Properties bound to the
current thread context class loader.
|
static void | setProperty(String propertyName, String value)
Set value for property bound to the current thread context class loader. |
static void | setProperty(String propertyName, String value, boolean isDefault)
Set value for property bound to the current thread context class loader. |
Returns: Returns a java.util.Properties
instance
that is equivalent to the current state of the scoped
properties, in that getProperty() will return the same value.
However, this is a copy, so setProperty on the
returned value will not effect the scoped properties.
Parameters: propertyName property name.
Returns: property value if found, otherwise default.
Parameters: propertyName property name. dephault default value.
Returns: property value if found, otherwise default.
Parameters: classLoader propertyName property name.
Returns: property value if found, otherwise default.
Parameters: classLoader propertyName property name. dephault default value.
Returns: property value if found, otherwise default.
Properties
bound to the
current thread context class loader.
Parameters: newProperties name/value pairs to be bound
Properties
bound to the
current thread context class loader.
Parameters: newProperties name/value pairs to be bound isDefault determines if properties are default or not. A non-default property cannot be overriden. A default property can be overriden by a property (default or non-default) of the same name bound to a decendent class loader.
Parameters: propertyName property name value property value (non-default) If null, remove the property.
Parameters: propertyName property name value property value. If null, remove the property. isDefault determines if property is default or not. A non-default property cannot be overriden. A default property can be overriden by a property (default or non-default) of the same name bound to a decendent class loader.