Class YamlMapFactoryBean
- All Implemented Interfaces:
FactoryBean<Map<String,
,Object>> InitializingBean
Map
that reads from a YAML source, preserving the
YAML-declared value types and their structure.
YAML is a nice human-readable format for configuration, and it has some useful hierarchical properties. It's more or less a superset of JSON, so it has a lot of similar features.
If multiple resources are provided the later ones will override entries in
the earlier ones hierarchically; that is, all entries with the same nested key
of type Map
at any depth are merged. For example:
foo: bar: one: two three: fourplus (later in the list)
foo: bar: one: 2 five: sixresults in an effective input of
foo: bar: one: 2 three: four five: sixNote that the value of "foo" in the first document is not simply replaced with the value in the second, but its nested values are merged.
Requires SnakeYAML 2.0 or higher, as of Spring Framework 6.1.
- Since:
- 4.1
- Author:
- Dave Syer, Juergen Hoeller
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Nested Class Summary
Nested classes/interfaces inherited from class org.springframework.beans.factory.config.YamlProcessor
YamlProcessor.DocumentMatcher, YamlProcessor.MatchCallback, YamlProcessor.MatchStatus, YamlProcessor.ResolutionMethod
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Field Summary
Fields inherited from interface org.springframework.beans.factory.FactoryBean
OBJECT_TYPE_ATTRIBUTE
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Constructor Summary
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Method Summary
Modifier and TypeMethodDescriptionvoid
Invoked by the containingBeanFactory
after it has set all bean properties and satisfiedBeanFactoryAware
,ApplicationContextAware
etc.Template method that subclasses may override to construct the object returned by this factory.Return an instance (possibly shared or independent) of the object managed by this factory.Class<?>
Return the type of object that this FactoryBean creates, ornull
if not known in advance.boolean
Is the object managed by this factory a singleton? That is, willFactoryBean.getObject()
always return the same object (a reference that can be cached)?void
setSingleton
(boolean singleton) Set if a singleton should be created, or a new object on each request otherwise.Methods inherited from class org.springframework.beans.factory.config.YamlProcessor
createYaml, getFlattenedMap, process, setDocumentMatchers, setMatchDefault, setResolutionMethod, setResources, setSupportedTypes
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Constructor Details
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YamlMapFactoryBean
public YamlMapFactoryBean()
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Method Details
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setSingleton
public void setSingleton(boolean singleton) Set if a singleton should be created, or a new object on each request otherwise. Default istrue
(a singleton). -
isSingleton
public boolean isSingleton()Description copied from interface:FactoryBean
Is the object managed by this factory a singleton? That is, willFactoryBean.getObject()
always return the same object (a reference that can be cached)?NOTE: If a FactoryBean indicates to hold a singleton object, the object returned from
getObject()
might get cached by the owning BeanFactory. Hence, do not returntrue
unless the FactoryBean always exposes the same reference.The singleton status of the FactoryBean itself will generally be provided by the owning BeanFactory; usually, it has to be defined as singleton there.
NOTE: This method returning
false
does not necessarily indicate that returned objects are independent instances. An implementation of the extendedSmartFactoryBean
interface may explicitly indicate independent instances through itsSmartFactoryBean.isPrototype()
method. PlainFactoryBean
implementations which do not implement this extended interface are simply assumed to always return independent instances if theisSingleton()
implementation returnsfalse
.The default implementation returns
true
, since aFactoryBean
typically manages a singleton instance.- Specified by:
isSingleton
in interfaceFactoryBean<Map<String,
Object>> - Returns:
- whether the exposed object is a singleton
- See Also:
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afterPropertiesSet
public void afterPropertiesSet()Description copied from interface:InitializingBean
Invoked by the containingBeanFactory
after it has set all bean properties and satisfiedBeanFactoryAware
,ApplicationContextAware
etc.This method allows the bean instance to perform validation of its overall configuration and final initialization when all bean properties have been set.
- Specified by:
afterPropertiesSet
in interfaceInitializingBean
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getObject
Description copied from interface:FactoryBean
Return an instance (possibly shared or independent) of the object managed by this factory.As with a
BeanFactory
, this allows support for both the Singleton and Prototype design pattern.If this FactoryBean is not fully initialized yet at the time of the call (for example because it is involved in a circular reference), throw a corresponding
FactoryBeanNotInitializedException
.As of Spring 2.0, FactoryBeans are allowed to return
null
objects. The factory will consider this as normal value to be used; it will not throw a FactoryBeanNotInitializedException in this case anymore. FactoryBean implementations are encouraged to throw FactoryBeanNotInitializedException themselves now, as appropriate.- Specified by:
getObject
in interfaceFactoryBean<Map<String,
Object>> - Returns:
- an instance of the bean (can be
null
) - See Also:
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getObjectType
Description copied from interface:FactoryBean
Return the type of object that this FactoryBean creates, ornull
if not known in advance.This allows one to check for specific types of beans without instantiating objects, for example on autowiring.
In the case of implementations that are creating a singleton object, this method should try to avoid singleton creation as far as possible; it should rather estimate the type in advance. For prototypes, returning a meaningful type here is advisable too.
This method can be called before this FactoryBean has been fully initialized. It must not rely on state created during initialization; of course, it can still use such state if available.
NOTE: Autowiring will simply ignore FactoryBeans that return
null
here. Therefore, it is highly recommended to implement this method properly, using the current state of the FactoryBean.- Specified by:
getObjectType
in interfaceFactoryBean<Map<String,
Object>> - Returns:
- the type of object that this FactoryBean creates,
or
null
if not known at the time of the call - See Also:
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createMap
Template method that subclasses may override to construct the object returned by this factory.Invoked lazily the first time
getObject()
is invoked in case of a shared singleton; else, on eachgetObject()
call.The default implementation returns the merged
Map
instance.- Returns:
- the object returned by this factory
- See Also:
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