Class LazyDynaMap
- All Implemented Interfaces:
Serializable,DynaBean,DynaClass,MutableDynaClass
Provides a light weight DynaBean facade to a Map
with lazy map/list processing.
Its a light weight DynaBean implementation because there is no
actual DynaClass associated with this DynaBean - in fact
it implements the DynaClass interface itself providing pseudo DynaClass
behavior from the actual values stored in the Map.
As well providing rhe standard DynaBean access to the Map's properties
this class also provides the usual Lazy behavior:
- Properties don't need to be pre-defined in a
DynaClass - Indexed properties (
ListsorArrays) are automatically instantiated and grown so that they are large enough to cater for the index being set. - Mapped properties are automatically instantiated.
Restricted DynaClass
This class implements the MutableDynaClass interface.
MutableDynaClass have a facility to restrict the DynaClass
so that its properties cannot be modified. If the MutableDynaClass is
restricted then calling any of the set() methods for a property which
doesn't exist will result in a IllegalArgumentException being thrown.
- See Also:
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Field Summary
FieldsModifier and TypeFieldDescriptionprotected StringThe name of this DynaClass (analogous to thegetName()method ofjava.lang.Class).protected booleanControls whether changes to this DynaClass's properties are allowed.protected booleanControls whether thegetDynaProperty()method returns null if a property doesn't exist - or creates a new one.Fields inherited from class org.apache.commons.beanutils.LazyDynaBean
BigDecimal_ZERO, BigInteger_ZERO, Byte_ZERO, Character_SPACE, Double_ZERO, dynaClass, Float_ZERO, Integer_ZERO, Long_ZERO, Short_ZERO, values -
Constructor Summary
ConstructorsConstructorDescriptionConstructs a new instance.LazyDynaMap(String name) Construct a newLazyDynaMapwith the specified name.LazyDynaMap(String name, Map<String, Object> values) Construct a newLazyDynaMapwith the specified name andMap.LazyDynaMap(String name, DynaProperty[] properties) Construct a newLazyDynaMapwith the specified name and properties.LazyDynaMap(Map<String, Object> values) Construct a newLazyDynaMapwith the specifiedMap.LazyDynaMap(DynaClass dynaClass) Construct a newLazyDynaMapbased on an exisiting DynaClassLazyDynaMap(DynaProperty[] properties) Construct a newLazyDynaMapwith the specified properties. -
Method Summary
Modifier and TypeMethodDescriptionvoidAdd a new dynamic property with no restrictions on data type, readability, or writeability.voidAdd a new dynamic property with the specified data type, but with no restrictions on readability or writeability.voidAdd a new dynamic property with the specified data type, readability, and writeability.protected voidadd(DynaProperty property) Add a new dynamic property.Return an array ofProperyDescriptorsfor the properties currently defined in this DynaClass.getDynaProperty(String name) Return a property descriptor for the specified property.getMap()Return the underlying Map backing thisDynaBeangetName()Return the name of this DynaClass (analogous to thegetName()method ofjava.lang.Class)protected booleanisDynaProperty(String name) Indicate whether a property actually exists.booleanIs this DynaClass currently restricted.booleanShould this DynaClass return anullfrom thegetDynaProperty(name)method if the property doesn't exist.Instantiate and return a new DynaBean instance, associated with this DynaClass.voidRemove the specified dynamic property, and any associated data type, readability, and writeability, from this dynamic class.voidSet the value of a simple property with the specified name.voidSet the Map backing thisDynaBeanvoidsetRestricted(boolean restricted) Set whether this DynaClass is currently restricted.voidsetReturnNull(boolean returnNull) Set whether this DynaClass should return anullfrom thegetDynaProperty(name)method if the property doesn't exist.Methods inherited from class org.apache.commons.beanutils.LazyDynaBean
contains, createDynaBeanProperty, createIndexedProperty, createMappedProperty, createNumberProperty, createOtherProperty, createPrimitiveProperty, createProperty, defaultIndexedProperty, defaultMappedProperty, get, get, get, getDynaClass, growIndexedProperty, isAssignable, newMap, remove, set, set, size
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Field Details
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name
The name of this DynaClass (analogous to thegetName()method ofjava.lang.Class). -
restricted
Controls whether changes to this DynaClass's properties are allowed. -
returnNull
Controls whether the
getDynaProperty()method returns null if a property doesn't exist - or creates a new one.Default is
false.
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Constructor Details
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LazyDynaMap
public LazyDynaMap()Constructs a new instance. -
LazyDynaMap
Construct a newLazyDynaMapbased on an exisiting DynaClass- Parameters:
dynaClass- DynaClass to copy the name and properties from
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LazyDynaMap
Construct a newLazyDynaMapwith the specified properties.- Parameters:
properties- Property descriptors for the supported properties
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LazyDynaMap
Construct a newLazyDynaMapwith the specifiedMap.- Parameters:
values- The Map backing thisLazyDynaMap
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LazyDynaMap
Construct a newLazyDynaMapwith the specified name.- Parameters:
name- Name of this DynaBean class
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LazyDynaMap
Construct a newLazyDynaMapwith the specified name and properties.- Parameters:
name- Name of this DynaBean classproperties- Property descriptors for the supported properties
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LazyDynaMap
Construct a newLazyDynaMapwith the specified name andMap.- Parameters:
name- Name of this DynaBean classvalues- The Map backing thisLazyDynaMap
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Method Details
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add
Add a new dynamic property.- Parameters:
property- Property the new dynamic property to add.- Throws:
IllegalArgumentException- if name is null
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add
Add a new dynamic property with no restrictions on data type, readability, or writeability.- Specified by:
addin interfaceMutableDynaClass- Parameters:
name- Name of the new dynamic property- Throws:
IllegalArgumentException- if name is null
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add
Add a new dynamic property with the specified data type, but with no restrictions on readability or writeability.- Specified by:
addin interfaceMutableDynaClass- Parameters:
name- Name of the new dynamic propertytype- Data type of the new dynamic property (null for no restrictions)- Throws:
IllegalArgumentException- if name is nullIllegalStateException- if this DynaClass is currently restricted, so no new properties can be added
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add
Add a new dynamic property with the specified data type, readability, and writeability.
N.B.Support for readable/writeable properties has not been implemented and this method always throws a
UnsupportedOperationException.I'm not sure the intention of the original authors for this method, but it seems to me that readable/writable should be attributes of the
DynaPropertyclass (which they are not) and is the reason this method has not been implemented.- Specified by:
addin interfaceMutableDynaClass- Parameters:
name- Name of the new dynamic propertytype- Data type of the new dynamic property (null for no restrictions)readable- Set totrueif this property value should be readablewriteable- Set totrueif this property value should be writeable- Throws:
UnsupportedOperationException- anytime this method is called
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getDynaProperties
Return an array of
ProperyDescriptorsfor the properties currently defined in this DynaClass. If no properties are defined, a zero-length array will be returned.FIXME - Should we really be implementing
getBeanInfo()instead, which returns property descriptors and a bunch of other stuff?- Specified by:
getDynaPropertiesin interfaceDynaClass- Returns:
- the set of properties for this DynaClass
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getDynaProperty
Return a property descriptor for the specified property.
If the property is not found and the
returnNullindicator istrue, this method always returnsnull.If the property is not found and the
returnNullindicator isfalsea new property descriptor is created and returned (although its not actually added to the DynaClass's properties). This is the default beahviour.The reason for not returning a
nullproperty descriptor is thatBeanUtilsuses this method to check if a property exists before trying to set it - since these Map implementations automatically add any new properties when they are set, returningnullfrom this method would defeat their purpose.- Specified by:
getDynaPropertyin interfaceDynaClass- Parameters:
name- Name of the dynamic property for which a descriptor is requested- Returns:
- The descriptor for the specified property
- Throws:
IllegalArgumentException- if no property name is specified
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getMap
Return the underlying Map backing thisDynaBean- Overrides:
getMapin classLazyDynaBean- Returns:
- the underlying Map
- Since:
- 1.8.0
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getName
Return the name of this DynaClass (analogous to thegetName()method ofjava.lang.Class) -
isDynaProperty
Indicate whether a property actually exists.
N.B. Using
getDynaProperty(name) == nulldoesn't work in this implementation because that method might return a DynaProperty if it doesn't exist (depending on thereturnNullindicator).- Overrides:
isDynaPropertyin classLazyDynaBean- Parameters:
name- Name of the dynamic property- Returns:
trueif the property exists, otherwisefalse- Throws:
IllegalArgumentException- if no property name is specified
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isRestricted
Is this DynaClass currently restricted.
If restricted, no changes to the existing registration of property names, data types, readability, or writeability are allowed.
- Specified by:
isRestrictedin interfaceMutableDynaClass- Returns:
trueif this MutableDynaClassis restricted, otherwisefalse
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isReturnNull
Should this DynaClass return anullfrom thegetDynaProperty(name)method if the property doesn't exist.- Returns:
trueif anullDynaPropertyshould be returned if the property doesn't exist, otherwisefalseif a newDynaPropertyshould be created.
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newInstance
Instantiate and return a new DynaBean instance, associated with this DynaClass.- Specified by:
newInstancein interfaceDynaClass- Returns:
- A new
DynaBeaninstance
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remove
Remove the specified dynamic property, and any associated data type, readability, and writeability, from this dynamic class. NOTE - This does NOT cause any corresponding property values to be removed from DynaBean instances associated with this DynaClass.- Specified by:
removein interfaceMutableDynaClass- Parameters:
name- Name of the dynamic property to remove- Throws:
IllegalArgumentException- if name is nullIllegalStateException- if this DynaClass is currently restricted, so no properties can be removed
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set
Set the value of a simple property with the specified name.- Specified by:
setin interfaceDynaBean- Overrides:
setin classLazyDynaBean- Parameters:
name- Name of the property whose value is to be setvalue- Value to which this property is to be set
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setMap
Set the Map backing thisDynaBean- Parameters:
values- The new Map of values
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setRestricted
Set whether this DynaClass is currently restricted.
If restricted, no changes to the existing registration of property names, data types, readability, or writeability are allowed.
- Specified by:
setRestrictedin interfaceMutableDynaClass- Parameters:
restricted- The new restricted state
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setReturnNull
Set whether this DynaClass should return anullfrom thegetDynaProperty(name)method if the property doesn't exist.- Parameters:
returnNull-trueif anullDynaPropertyshould be returned if the property doesn't exist, otherwisefalseif a newDynaPropertyshould be created.
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