org.springframework.core.env

## Class MutablePropertySources

- java.lang.Object
- - org.springframework.core.env.MutablePropertySources

- All Implemented Interfaces:
    Iterable<PropertySource<?>>, PropertySources

      public class MutablePropertySources
      extends Object
      implements PropertySources

  Default implementation of the `PropertySources` interface. Allows manipulation of contained property sources and provides a constructor for copying an existing `PropertySources` instance.

  Where precedence is mentioned in methods such as `addFirst(org.springframework.core.env.PropertySource<?>)` and `addLast(org.springframework.core.env.PropertySource<?>)`, this is with regard to the order in which property sources will be searched when resolving a given property with a `PropertyResolver`.

  Since:
    3.1
  Author:
    Chris Beams
  See Also:
    `PropertySourcesPropertyResolver`

- - ### Constructor Summary

    Constructors
    Constructor and Description
    `MutablePropertySources()` Create a new `MutablePropertySources` object.
    `MutablePropertySources(PropertySources propertySources)` Create a new `MutablePropertySources` from the given propertySources object, preserving the original order of contained `PropertySource` objects.

  - ### Method Summary

    Methods
    Modifier and Type | Method and Description
    --- | ---
    `void` | `addAfter(String relativePropertySourceName, PropertySource<?> propertySource)` Add the given property source object with precedence immediately lower than than the named relative property source.
    `void` | `addBefore(String relativePropertySourceName, PropertySource<?> propertySource)` Add the given property source object with precedence immediately higher than the named relative property source.
    `void` | `addFirst(PropertySource<?> propertySource)` Add the given property source object with highest precedence.
    `void` | `addLast(PropertySource<?> propertySource)` Add the given property source object with lowest precedence.
    `protected void` | `assertLegalRelativeAddition(String relativePropertySourceName, PropertySource<?> propertySource)` Ensure that the given property source is not being added relative to itself.
    `boolean` | `contains(String name)` Return whether a property source with the given name is contained.
    `PropertySource<?>` | `get(String name)` Return the property source with the given name, `null` if not found.
    `Iterator<PropertySource<?>>` | `iterator()`
    `int` | `precedenceOf(PropertySource<?> propertySource)` Return the precedence of the given property source, `-1` if not found.
    `PropertySource<?>` | `remove(String name)` Remove and return the property source with the given name, `null` if not found.
    `protected void` | `removeIfPresent(PropertySource<?> propertySource)` Log the removal of the given propertySource if it is present.
    `void` | `replace(String name, PropertySource<?> propertySource)` Replace the property source with the given name with the given property source object.
    `int` | `size()` Return the number of `PropertySource` objects contained.
    `String` | `toString()`

    - ### Methods inherited from class java.lang.Object

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

- - ### Constructor Detail

    - #### MutablePropertySources

          public MutablePropertySources()

      Create a new `MutablePropertySources` object.

    - #### MutablePropertySources

          public MutablePropertySources(PropertySources propertySources)

      Create a new `MutablePropertySources` from the given propertySources object, preserving the original order of contained `PropertySource` objects.

  - ### Method Detail

    - #### contains

          public boolean contains(String name)

      Description copied from interface: `PropertySources`
      Return whether a property source with the given name is contained.
      Specified by:
        `contains` in interface `PropertySources`
      Parameters:
        `name` - the name of the property source to find

    - #### get

          public PropertySource<?> get(String name)

      Description copied from interface: `PropertySources`
      Return the property source with the given name, `null` if not found.
      Specified by:
        `get` in interface `PropertySources`
      Parameters:
        `name` - the name of the property source to find

    - #### iterator

          public Iterator<PropertySource<?>> iterator()

      Specified by:
        `iterator` in interface `Iterable<PropertySource<?>>`

    - #### addFirst

          public void addFirst(PropertySource<?> propertySource)

      Add the given property source object with highest precedence.

    - #### addLast

          public void addLast(PropertySource<?> propertySource)

      Add the given property source object with lowest precedence.

    - #### addBefore

          public void addBefore(String relativePropertySourceName,
                       PropertySource<?> propertySource)

      Add the given property source object with precedence immediately higher than the named relative property source.

    - #### addAfter

          public void addAfter(String relativePropertySourceName,
                      PropertySource<?> propertySource)

      Add the given property source object with precedence immediately lower than than the named relative property source.

    - #### precedenceOf

          public int precedenceOf(PropertySource<?> propertySource)

      Return the precedence of the given property source, `-1` if not found.

    - #### remove

          public PropertySource<?> remove(String name)

      Remove and return the property source with the given name, `null` if not found.
      Parameters:
        `name` - the name of the property source to find and remove

    - #### replace

          public void replace(String name,
                     PropertySource<?> propertySource)

      Replace the property source with the given name with the given property source object.
      Parameters:
        `name` - the name of the property source to find and replace
        `propertySource` - the replacement property source
      Throws:
        `IllegalArgumentException` - if no property source with the given name is present
      See Also:
        `contains(java.lang.String)`

    - #### size

          public int size()

      Return the number of `PropertySource` objects contained.

    - #### toString

          public String toString()

      Overrides:
        `toString` in class `Object`

    - #### assertLegalRelativeAddition

          protected void assertLegalRelativeAddition(String relativePropertySourceName,
                                         PropertySource<?> propertySource)

      Ensure that the given property source is not being added relative to itself.

    - #### removeIfPresent

          protected void removeIfPresent(PropertySource<?> propertySource)

      Log the removal of the given propertySource if it is present.