EnumerablePropertySource (Spring Framework 4.3.30.RELEASE API)

java.lang.Object
- org.springframework.core.env.PropertySource<T>
- - org.springframework.core.env.EnumerablePropertySource<T>

Direct Known Subclasses:
CommandLinePropertySource, CompositePropertySource, MapPropertySource, PortletConfigPropertySource, PortletContextPropertySource, ServletConfigPropertySource, ServletContextPropertySource
```
public abstract class EnumerablePropertySource<T>
extends PropertySource<T>
```
A PropertySource implementation capable of interrogating its underlying source object to enumerate all possible property name/value pairs. Exposes the getPropertyNames() method to allow callers to introspect available properties without having to access the underlying source object. This also facilitates a more efficient implementation of containsProperty(String), in that it can call getPropertyNames() and iterate through the returned array rather than attempting a call to PropertySource.getProperty(String) which may be more expensive. Implementations may consider caching the result of getPropertyNames() to fully exploit this performance opportunity.
Most framework-provided PropertySource implementations are enumerable; a counter-example would be JndiPropertySource where, due to the nature of JNDI it is not possible to determine all possible property names at any given time; rather it is only possible to try to access a property (via PropertySource.getProperty(String)) in order to evaluate whether it is present or not.
Since:
3.1
Author:
Chris Beams, Juergen Hoeller

Nested Class Summary
- Nested classes/interfaces inherited from class org.springframework.core.env.PropertySource
  PropertySource.StubPropertySource

Field Summary
- Fields inherited from class org.springframework.core.env.PropertySource
  logger, name, source

Constructor Summary
Constructors
Modifier Constructor Description
protected EnumerablePropertySource(String name)
EnumerablePropertySource(String name, T source)

Method Summary

All Methods Instance Methods Abstract Methods Concrete Methods
Modifier and Type	Method	Description
`boolean`	`containsProperty(String name)`	Return whether this `PropertySource` contains a property with the given name.
`abstract String[]`	`getPropertyNames()`	Return the names of all properties contained by the source object (never `null`).

Methods inherited from class org.springframework.core.env.PropertySource
equals, getName, getProperty, getSource, hashCode, named, toString

Methods inherited from class java.lang.Object
clone, finalize, getClass, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - EnumerablePropertySource
```
public EnumerablePropertySource(String name,
                                T source)
```
  - EnumerablePropertySource
```
protected EnumerablePropertySource(String name)
```
- Method Detail
  - containsProperty
```
public boolean containsProperty(String name)
```
    Return whether this PropertySource contains a property with the given name.
    This implementation checks for the presence of the given name within the getPropertyNames() array.
    Overrides:
    containsProperty in class PropertySource<T>
    Parameters:
    name - the name of the property to find
  - getPropertyNames
```
public abstract String[] getPropertyNames()
```
    Return the names of all properties contained by the source object (never null).