Expression Language 3.0 API 3.0.0 · javax.el.StaticFieldELResolver

Access	Constructor and Description
public	StaticFieldELResolver()

Method Summary

Modifier and Type	Method and Description
public Class<?>	Returns: `String.class`. getCommonPropertyType(ELContext The context of this evaluation. context, Object An `ELClass`. base) Implements abstract javax.el.ELResolver.getCommonPropertyType. Returns the type of the property.
public Iterator<FeatureDescriptor>	Returns: `null`. getFeatureDescriptors(ELContext The context of this evaluation. context, Object An `ELClass`. base) Implements abstract javax.el.ELResolver.getFeatureDescriptors. Returns the properties that can be resolved.
public Class<?>	Returns: If the `propertyResolved` property of `ELContext` was set to `true`, then the type of the type of the field. getType(ELContext The context of this evaluation. context, Object An `ELClass`. base, Object The name of the field. property) Implements abstract javax.el.ELResolver.getType. Returns the type of a static field.
public Object	Returns: If the `propertyResolved` property of `ELContext` was set to `true`, then the static field value. getValue(ELContext The context of this evaluation. context, Object An `ELClass`. base, Object A static field name. property) Implements abstract javax.el.ELResolver.getValue. Returns the value of a static field.
public Object	Returns: The result of the method invocation (`null` if the method has a `void` return type). invoke(ELContext The context of this evaluation. context, Object An `ELClass` base, Object When coerced to a `String`, the simple name of the method. method, Class<?>[] An array of Class objects identifying the method's formal parameter types, in declared order. Use an empty array if the method has no parameters. Can be `null`, in which case the method's formal parameter types are assumed to be unknown. paramTypes, Object[] The parameters to pass to the method, or `null` if no parameters. params) Overrides javax.el.ELResolver.invoke. Invokes a public static method or the constructor for a class.
public boolean	Returns: `true` isReadOnly(ELContext The context of this evaluation. context, Object An `ELClass`. base, Object The name of the bean. property) Implements abstract javax.el.ELResolver.isReadOnly. Inquires whether the static field is writable.
public void	setValue(ELContext The context of this evaluation. context, Object An `ELClass` base, Object The name of the field property, Object The value to set the field of the class to. value) Implements abstract javax.el.ELResolver.setValue. Attempts to write to a static field.

Inherited from javax.el.ELResolver:: convertToType

StaticFieldELResolver	back to summary
public StaticFieldELResolver()

Method Detail

getCommonPropertyType back to summary

getCommonPropertyType	back to summary
public Class<?> getCommonPropertyType(ELContext context, Object base) Implements abstract javax.el.ELResolver.getCommonPropertyType. Returns the type of the property. Always returns `String.class`, since a field name is a String. Parameters context:ELContext The context of this evaluation. base:Object An `ELClass`. Returns:Class<?> `String.class`. Annotations @Override

public Class<?> getCommonPropertyType(ELContext context, Object base)

Implements abstract javax.el.ELResolver.getCommonPropertyType.

Returns the type of the property. Always returns String.class, since a field name is a String.

Parameters

context:ELContext: The context of this evaluation.
base:Object: An ELClass.

Returns:Class<?>

String.class.

Annotations

@Override

getFeatureDescriptors back to summary

getFeatureDescriptors	back to summary
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base) Implements abstract javax.el.ELResolver.getFeatureDescriptors. Returns the properties that can be resolved. Always returns `null`, since there is no reason to iterate through a list of one element: field name. Parameters context:ELContext The context of this evaluation. base:Object An `ELClass`. Returns:Iterator<FeatureDescriptor> `null`. Annotations @Override

public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base)

Implements abstract javax.el.ELResolver.getFeatureDescriptors.

Returns the properties that can be resolved. Always returns null, since there is no reason to iterate through a list of one element: field name.

Parameters

context:ELContext: The context of this evaluation.
base:Object: An ELClass.

Returns:Iterator<FeatureDescriptor>

null.

Annotations

@Override

getType back to summary

getType	back to summary
public Class<?> getType(ELContext context, Object base, Object property) Implements abstract javax.el.ELResolver.getType. Returns the type of a static field. If the base object is an instance of `ELClass`and the property is a String, the `propertyResolved` property of the `ELContext` object must be set to `true` by the resolver, before returning. If this property is not `true` after this method is called, the caller can safely assume no value has been set. If the property string is a public static field of class specified in ELClass, return the type of the static field. Parameters context:ELContext The context of this evaluation. base:Object An `ELClass`. property:Object The name of the field. Returns:Class<?> If the `propertyResolved` property of `ELContext` was set to `true`, then the type of the type of the field. Annotations @Override Exceptions NullPointerException: if context is `null`. PropertyNotFoundException: if field is not a public static filed of the class, or if the field is inaccessible.

public Class<?> getType(ELContext context, Object base, Object property)

Implements abstract javax.el.ELResolver.getType.

Returns the type of a static field.

If the base object is an instance of ELClassand the property is a String, the propertyResolved property of the ELContext object must be set to true by the resolver, before returning. If this property is not true after this method is called, the caller can safely assume no value has been set.

If the property string is a public static field of class specified in ELClass, return the type of the static field.

Parameters

context:ELContext: The context of this evaluation.
base:Object: An ELClass.
property:Object: The name of the field.

Returns:Class<?>

If the propertyResolved property of ELContext was set to true, then the type of the type of the field.

Annotations

@Override

Exceptions

NullPointerException:: if context is null.
PropertyNotFoundException:: if field is not a public static filed of the class, or if the field is inaccessible.

getValue back to summary

getValue	back to summary
public Object getValue(ELContext context, Object base, Object property) Implements abstract javax.el.ELResolver.getValue. Returns the value of a static field. If the base object is an instance of `ELClass` and the property is String, 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. If the property is a public static field of class specified in `ELClass`, return the value of the static field. An Enum constant is a public static field of an Enum object, and is a special case of this. Parameters context:ELContext The context of this evaluation. base:Object An `ELClass`. property:Object A static field name. Returns:Object If the `propertyResolved` property of `ELContext` was set to `true`, then the static field value. Annotations @Override Exceptions NullPointerException: if context is `null`. PropertyNotFoundException: if the specified class does not exist, or if the field is not a public static filed of the class, or if the field is inaccessible.

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

Implements abstract javax.el.ELResolver.getValue.

Returns the value of a static field.

If the base object is an instance of ELClass and the property is String, 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.

If the property is a public static field of class specified in ELClass, return the value of the static field. An Enum constant is a public static field of an Enum object, and is a special case of this.

Parameters

context:ELContext: The context of this evaluation.
base:Object: An ELClass.
property:Object: A static field name.

Returns:Object

If the propertyResolved property of ELContext was set to true, then the static field value.

Annotations

@Override

Exceptions

NullPointerException:: if context is null.
PropertyNotFoundException:: if the specified class does not exist, or if the field is not a public static filed of the class, or if the field is inaccessible.

invoke back to summary

invoke	back to summary
public Object invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params) Overrides javax.el.ELResolver.invoke. Invokes a public static method or the constructor for a class. If the base object is an instance of `ELClass` and the method is a String, the `propertyResolved` property of the `ELContext` object must be set to `true` by the resolver, before returning. If this property is not `true` after this method is called, the caller should ignore the return value. Invoke the public static method specified by `method`. The process involved in the method selection is the same as that used in `BeanELResolver`. As a special case, if the name of the method is "<init>", the constructor for the class will be invoked. Parameters context:ELContext Doc from javax.el.ELResolver.invoke. The context of this evaluation. base:Object An `ELClass` method:Object When coerced to a `String`, the simple name of the method. paramTypes:Class<?>[] An array of Class objects identifying the method's formal parameter types, in declared order. Use an empty array if the method has no parameters. Can be `null`, in which case the method's formal parameter types are assumed to be unknown. params:Object[] The parameters to pass to the method, or `null` if no parameters. Returns:Object The result of the method invocation (`null` if the method has a `void` return type). Annotations @Override Exceptions MethodNotFoundException: if no suitable method can be found. ELException: if an exception was thrown while performing (base, method) resolution. The thrown exception must be included as the cause property of this exception, if available. If the exception thrown is an `InvocationTargetException`, extract its `cause` and pass it to the `ELException` constructor.

public Object invoke(ELContext context, Object base, Object method, Class<?>[] paramTypes, Object[] params)

Overrides javax.el.ELResolver.invoke.

Invokes a public static method or the constructor for a class.

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

Invoke the public static method specified by method.

The process involved in the method selection is the same as that used in BeanELResolver.

As a special case, if the name of the method is "<init>", the constructor for the class will be invoked.

Parameters

context:ELContext

Doc from javax.el.ELResolver.invoke.

The context of this evaluation.

base:Object

An ELClass

method:Object

When coerced to a String, the simple name of the method.

paramTypes:Class<?>[]

An array of Class objects identifying the method's formal parameter types, in declared order. Use an empty array if the method has no parameters. Can be null, in which case the method's formal parameter types are assumed to be unknown.

params:Object[]

The parameters to pass to the method, or null if no parameters.

Returns:Object

The result of the method invocation (null if the method has a void return type).

Annotations

@Override

Exceptions

MethodNotFoundException:: if no suitable method can be found.
ELException:: if an exception was thrown while performing (base, method) resolution. The thrown exception must be included as the cause property of this exception, if available. If the exception thrown is an InvocationTargetException, extract its cause and pass it to the ELException constructor.

isReadOnly back to summary

isReadOnly	back to summary
public boolean isReadOnly(ELContext context, Object base, Object property) Implements abstract javax.el.ELResolver.isReadOnly. Inquires whether the static field is writable. If the base object is an instance of `ELClass`and the property is a String, the `propertyResolved` property of the `ELContext` object must be set to `true` by the resolver, before returning. If this property is not `true` after this method is called, the caller can safely assume no value has been set. Always returns a `true` because writing to a static field is not allowed. Parameters context:ELContext The context of this evaluation. base:Object An `ELClass`. property:Object The name of the bean. Returns:boolean `true` Annotations @Override Exceptions NullPointerException: if context is `null`.

public boolean isReadOnly(ELContext context, Object base, Object property)

Implements abstract javax.el.ELResolver.isReadOnly.

Inquires whether the static field is writable.

Always returns a true because writing to a static field is not allowed.

Parameters

context:ELContext: The context of this evaluation.
base:Object: An ELClass.
property:Object: The name of the bean.

Returns:boolean

true

Annotations

@Override

Exceptions

NullPointerException:: if context is null.

setValue back to summary

setValue	back to summary
public void setValue(ELContext context, Object base, Object property, Object value) Implements abstract javax.el.ELResolver.setValue. Attempts to write to a static field. If the base object is an instance of `ELClass`and the property is String, a `PropertyNotWritableException` will always be thrown, because writing to a static field is not allowed. Parameters context:ELContext The context of this evaluation. base:Object An `ELClass` property:Object The name of the field value:Object The value to set the field of the class to. Annotations @Override Exceptions NullPointerException: if context is `null` PropertyNotWritableException: Doc from javax.el.ELResolver.setValue. if the given (base, property) pair is handled by this `ELResolver` but the specified variable or property is not writable.

public void setValue(ELContext context, Object base, Object property, Object value)

Implements abstract javax.el.ELResolver.setValue.

Attempts to write to a static field.

If the base object is an instance of ELClassand the property is String, a PropertyNotWritableException will always be thrown, because writing to a static field is not allowed.

Parameters

context:ELContext: The context of this evaluation.
base:Object: An ELClass
property:Object: The name of the field
value:Object: The value to set the field of the class to.

Annotations

@Override

Exceptions

NullPointerException:

if context is null

PropertyNotWritableException:

Doc from javax.el.ELResolver.setValue.

if the given (base, property) pair is handled by this ELResolver but the specified variable or property is not writable.

public Class StaticFieldELResolver

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