Class LazyResourceManager
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescription<R> R
create
(DeviceResourceDescriptor<R> descriptor) Returns the resource described by the given descriptor.<R> void
destroy
(DeviceResourceDescriptor<R> descriptor) Deallocates a resource previously allocated byResourceManager.create(DeviceResourceDescriptor)
.<R> R
find
(DeviceResourceDescriptor<R> descriptor) Returns a previously allocated resource associated with the given descriptor, or null if none exists yet.protected Image
Returns the default image that will be returned in the event that the intended image is missing.Returns the Device for which this ResourceManager will create resourcesMethods inherited from class org.eclipse.jface.resource.ResourceManager
cancelDisposeExec, createColor, createColor, createFont, createImage, createImageWithDefault, destroyColor, destroyColor, destroyFont, destroyImage, dispose, disposeExec, get
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Constructor Details
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LazyResourceManager
- Parameters:
cacheSize
- the lru cache sizeparent
- ResourceManager
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Method Details
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getDevice
Description copied from class:ResourceManager
Returns the Device for which this ResourceManager will create resources- Specified by:
getDevice
in classResourceManager
- Returns:
- the Device associated with this ResourceManager
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getDefaultImage
Description copied from class:ResourceManager
Returns the default image that will be returned in the event that the intended image is missing.- Specified by:
getDefaultImage
in classResourceManager
- Returns:
- a default image that will be returned in the event that the intended image is missing.
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create
Description copied from class:ResourceManager
Returns the resource described by the given descriptor. If the resource already exists, the reference count is incremented and the exiting resource is returned. Otherwise, a new resource is allocated. Every call to this method should have a corresponding call toResourceManager.destroy(DeviceResourceDescriptor)
.If the resource is intended to live for entire lifetime of this resource-manager, a subsequent call to
ResourceManager.destroy(DeviceResourceDescriptor)
may be omitted and the resource will be cleaned up when this resource-manager is disposed. This pattern is useful for short-livedLocalResourceManager
s, but should never be used with the global resource-manager since doing so effectively leaks the resource.The resources returned from this method are reference counted and may be shared internally with other resource-managers. They should never be disposed outside of the ResourceManager framework, or it will cause exceptions in other code that shares them. For example, never call
Resource.dispose()
on anything returned from this method.- Specified by:
create
in classResourceManager
- Parameters:
descriptor
- descriptor for the resource to allocate- Returns:
- the newly allocated resource (not null)
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destroy
Description copied from class:ResourceManager
Deallocates a resource previously allocated byResourceManager.create(DeviceResourceDescriptor)
. Descriptors are compared by equality, not identity. If the same resource was created multiple times, this may decrement a reference count rather than disposing the actual resource.- Specified by:
destroy
in classResourceManager
- Parameters:
descriptor
- identifier for the resource
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find
Description copied from class:ResourceManager
Returns a previously allocated resource associated with the given descriptor, or null if none exists yet.- Specified by:
find
in classResourceManager
- Parameters:
descriptor
- descriptor to find- Returns:
- a previously allocated resource for the given descriptor or null if none.
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