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Java Source Code / Java Documentation » Scripting » JUEL » javax.el

Source Cross Reference Class Diagram Java Document (Java Doc)

java.lang .Object

javax.el .ELResolver

javax.el .ResourceBundleELResolver

ResourceBundleELResolver

public class ResourceBundleELResolver extends ELResolver (Code)

Defines property resolution behavior on instances of java.util.ResourceBundle .

This resolver handles base objects of type java.util.ResourceBundle. It accepts any object as a property and coerces it to a java.lang.String for invoking java.util.ResourceBundle.getObject(java.lang.String) .

This resolver is read only and will throw a PropertyNotWritableException if setValue is called.

ELResolvers are combined together using CompositeELResolver s, to define rich semantics for evaluating an expression. See the javadocs for ELResolver for details.

See Also:   CompositeELResolver
See Also:   ELResolver
See Also:   java.util.ResourceBundle
since:
   JSP 2.1

Method Summary
public Class	getCommonPropertyType(ELContext context, Object base) If the base object is a ResourceBundle, returns the most general type that this resolver accepts for the `property` argument. Otherwise, returns `null`. Assuming the base is a `ResourceBundle`, this method will always return `String.class`. Parameters: context - The context of this evaluation. Parameters: base - The bundle to analyze.
public Iterator	getFeatureDescriptors(ELContext context, Object base) If the base object is a ResourceBundle, returns an `Iterator` containing the set of keys available in the `ResourceBundle`. Otherwise, returns `null`. The `Iterator` returned must contain zero or more instances of java.beans.FeatureDescriptor .
public Class	getType(ELContext context, Object base, Object property) If the base object is an instance of `ResourceBundle`, return `null`, since the resolver is read only. If the base is `ResourceBundle`, the `propertyResolved` property of the `ELContext` object must be set to `true` by this resolver, before returning.
public Object	getValue(ELContext context, Object base, Object property) If the base object is an instance of `ResourceBundle`, the provided property will first be coerced to a `String`. The `Object` returned by `getObject` on the base `ResourceBundle` will be returned. If the base is `ResourceBundle`, the `propertyResolved` property of the `ELContext` object must be set to `true` by this resolver, before returning.
public boolean	isReadOnly(ELContext context, Object base, Object property) If the base object is not null and an instanceof ResourceBundle , return `true`. Parameters: context - The context of this evaluation. Parameters: base - The ResourceBundle to be modified.
public void	setValue(ELContext context, Object base, Object property, Object value) If the base object is a ResourceBundle, throw a PropertyNotWritableException . Parameters: context - The context of this evaluation. Parameters: base - The ResourceBundle to be modified.

Method Detail

getCommonPropertyType
public Class getCommonPropertyType(ELContext context, Object base)(Code)
	If the base object is a ResourceBundle, returns the most general type that this resolver accepts for the `property` argument. Otherwise, returns `null`. Assuming the base is a `ResourceBundle`, this method will always return `String.class`. Parameters: context - The context of this evaluation. Parameters: base - The bundle to analyze. Only bases of type`ResourceBundle` are handled by this resolver. `null` if base is not a `ResourceBundle`;otherwise `String.class`.

getFeatureDescriptors

public Iterator getFeatureDescriptors(ELContext context, Object base)(Code)

If the base object is a ResourceBundle, returns an Iterator containing the set of keys available in the ResourceBundle. Otherwise, returns null.

The Iterator returned must contain zero or more instances of java.beans.FeatureDescriptor . Each info object contains information about a key in the ResourceBundle, and is initialized as follows:

displayName - The String key

name - Same as displayName property.

shortDescription - Empty string

expert - false

hidden - false

preferred - true

In addition, the following named attributes must be set in the returned FeatureDescriptors:

ELResolver.TYPE - String.class

ELResolver.RESOLVABLE_AT_DESIGN_TIME - true

Parameters:
context - The context of this evaluation.
Parameters:
base - The bundle whose keys are to be iterated over. Only bases oftype ResourceBundle are handled by thisresolver. An Iterator containing zero or more (possiblyinfinitely more) FeatureDescriptor objects, eachrepresenting a key in this bundle, or null if thebase object is not a ResourceBundle.

getType
public Class getType(ELContext context, Object base, Object property)(Code)
	If the base object is an instance of `ResourceBundle`, return `null`, since the resolver is read only. If the base is `ResourceBundle`, the `propertyResolved` property of the `ELContext` object must be set to `true` by this resolver, before returning. If this property is not `true` after this method is called, the caller should ignore the return value. Parameters: context - The context of this evaluation. Parameters: base - The ResourceBundle to analyze. Parameters: property - The name of the property to analyze. If the `propertyResolved` property of`ELContext` was set to `true`, then`null`; otherwise undefined. throws: NullPointerException - if context is `null`

getValue

public Object getValue(ELContext context, Object base, Object property)(Code)

If the base object is an instance of ResourceBundle, the provided property will first be coerced to a String. The Object returned by getObject on the base ResourceBundle will be returned.

If the base is ResourceBundle, the propertyResolved property of the ELContext object must be set to true by this resolver, before returning. If this property is not true after this method is called, the caller should ignore the return value.

Parameters:
  context - The context of this evaluation.
Parameters:
  base - The ResourceBundle to analyze.
Parameters:
  property - The name of the property to analyze. Will be coerced to aString. If the propertyResolved property ofELContext was set to true, thennull if property is null;otherwise the Object for the given key(property coerced to String) from theResourceBundle.If no object for the given key can be found, then the String "???" + key + "???".
throws:
  NullPointerException - if context is null
throws:
  ELException - if an exception was thrown while performing the property orvariable resolution. The thrown exception must be included asthe cause property of this exception, if available.

isReadOnly
public boolean isReadOnly(ELContext context, Object base, Object property)(Code)
	If the base object is not null and an instanceof ResourceBundle , return `true`. Parameters: context - The context of this evaluation. Parameters: base - The ResourceBundle to be modified. Only bases that are of typeResourceBundle are handled. Parameters: property - The String property to use. If the `propertyResolved` property of`ELContext` was set to `true`, then`true`; otherwise undefined. throws: NullPointerException - if context is `null`

setValue
public void setValue(ELContext context, Object base, Object property, Object value)(Code)
	If the base object is a ResourceBundle, throw a PropertyNotWritableException . Parameters: context - The context of this evaluation. Parameters: base - The ResourceBundle to be modified. Only bases that are of typeResourceBundle are handled. Parameters: property - The String property to use. Parameters: value - The value to be set. throws: NullPointerException - if context is `null`. throws: PropertyNotWritableException - Always thrown if base is an instance of ReasourceBundle.

Fields inherited from javax.el.ELResolver

final public static String RESOLVABLE_AT_DESIGN_TIME(Code)(Java Doc)
final public static String TYPE(Code)(Java Doc)

Methods inherited from javax.el.ELResolver

abstract public Class getCommonPropertyType(ELContext context, Object base)(Code)(Java Doc)
abstract public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base)(Code)(Java Doc)
abstract public Class getType(ELContext context, Object base, Object property)(Code)(Java Doc)
abstract public Object getValue(ELContext context, Object base, Object property)(Code)(Java Doc)
abstract public boolean isReadOnly(ELContext context, Object base, Object property)(Code)(Java Doc)
abstract public void setValue(ELContext context, Object base, Object property, Object value)(Code)(Java Doc)

Methods inherited from java.lang.Object

native protected Object clone() throws CloneNotSupportedException(Code)(Java Doc)
public boolean equals(Object obj)(Code)(Java Doc)
protected void finalize() throws Throwable(Code)(Java Doc)
final native public Class getClass()(Code)(Java Doc)
native public int hashCode()(Code)(Java Doc)
final native public void notify()(Code)(Java Doc)
final native public void notifyAll()(Code)(Java Doc)
public String toString()(Code)(Java Doc)
final native public void wait(long timeout) throws InterruptedException(Code)(Java Doc)
final public void wait(long timeout, int nanos) throws InterruptedException(Code)(Java Doc)
final public void wait() throws InterruptedException(Code)(Java Doc)

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