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## org.springframework.ui.context.support
Class DelegatingThemeSource

    java.lang.Object
      org.springframework.ui.context.support.DelegatingThemeSource

All Implemented Interfaces:
  HierarchicalThemeSource, ThemeSource

    public class DelegatingThemeSource

extends Object
implements HierarchicalThemeSource

Empty ThemeSource that delegates all calls to the parent ThemeSource. If no parent is available, it simply won't resolve any theme.

Used as placeholder by UiApplicationContextUtils, if a context doesn't define its own ThemeSource. Not intended for direct use in applications.

Since:
  1.2.4
Author:
  Juergen Hoeller
See Also:
  `UiApplicationContextUtils`

Constructor Summary
`DelegatingThemeSource()`

Method Summary
`ThemeSource` | `getParentThemeSource()` Return the parent of this ThemeSource, or `null` if none.
`Theme` | `getTheme(String themeName)` Return the Theme instance for the given theme name.
`void` | `setParentThemeSource(ThemeSource parentThemeSource)` Set the parent that will be used to try to resolve theme messages that this object can't resolve.

Methods inherited from class java.lang.Object
`clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait`

Constructor Detail

### DelegatingThemeSource

    public DelegatingThemeSource()

Method Detail

### setParentThemeSource

    public void setParentThemeSource(ThemeSource parentThemeSource)

  Description copied from interface: `HierarchicalThemeSource`
  Set the parent that will be used to try to resolve theme messages that this object can't resolve.

  Specified by:
    `setParentThemeSource` in interface `HierarchicalThemeSource`
  Parameters:
    `parentThemeSource` - the parent ThemeSource that will be used to resolve messages that this object can't resolve. May be `null`, in which case no further resolution is possible.

### getParentThemeSource

    public ThemeSource getParentThemeSource()

  Description copied from interface: `HierarchicalThemeSource`
  Return the parent of this ThemeSource, or `null` if none.

  Specified by:
    `getParentThemeSource` in interface `HierarchicalThemeSource`

### getTheme

    public Theme getTheme(String themeName)

  Description copied from interface: `ThemeSource`
  Return the Theme instance for the given theme name.

  The returned Theme will resolve theme-specific messages, codes, file paths, etc (e.g. CSS and image files in a web environment).

  Specified by:
    `getTheme` in interface `ThemeSource`
  Parameters:
    `themeName` - the name of the theme
  Returns:
    the corresponding Theme, or `null` if none defined. Note that, by convention, a ThemeSource should at least be able to return a default Theme for the default theme name "theme" but may also return default Themes for other theme names.
  See Also:
    `AbstractThemeResolver.ORIGINAL_DEFAULT_THEME_NAME`

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