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java.lang.Objectjavax.el.ELResolver
javax.el.BeanELResolver
public class BeanELResolver
Defines property resolution behavior on objects using the JavaBeans component architecture. This
resolver handles base objects of any type, as long as the base is not null. It accepts any object
as a property, and coerces it to a string. That string is then used to find a JavaBeans compliant
property on the base object. The value is accessed using JavaBeans getters and setters. This
resolver can be constructed in read-only mode, which means that isReadOnly will always return
true and setValue(ELContext, Object, Object, Object)
will always throw
PropertyNotWritableException. ELResolvers are combined together using CompositeELResolver
s, to define rich semantics for evaluating an expression. See the javadocs for ELResolver
for details. Because this resolver handles base objects of any type, it should be placed near the
end of a composite resolver. Otherwise, it will claim to have resolved a property before any
resolvers that come after it get a chance to test if they can do so as well.
CompositeELResolver
,
ELResolver
Nested Class Summary | |
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protected static class |
BeanELResolver.BeanProperties
|
protected static class |
BeanELResolver.BeanProperty
|
Field Summary |
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Fields inherited from class javax.el.ELResolver |
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RESOLVABLE_AT_DESIGN_TIME, TYPE |
Constructor Summary | |
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BeanELResolver()
Creates a new read/write BeanELResolver. |
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BeanELResolver(boolean readOnly)
Creates a new BeanELResolver whose read-only status is determined by the given parameter. |
Method Summary | |
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java.lang.Class<?> |
getCommonPropertyType(ELContext context,
java.lang.Object base)
If the base object is not null, returns the most general type that this resolver accepts for the property argument. |
java.util.Iterator<java.beans.FeatureDescriptor> |
getFeatureDescriptors(ELContext context,
java.lang.Object base)
If the base object is not null, returns an Iterator containing the set of JavaBeans properties available on the given object. |
java.lang.Class<?> |
getType(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base object is not null, returns the most general acceptable type that can be set on this bean property. |
java.lang.Object |
getValue(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base object is not null, returns the current value of the given property on this bean. |
boolean |
isReadOnly(ELContext context,
java.lang.Object base,
java.lang.Object property)
If the base object is not null, returns whether a call to setValue(ELContext, Object, Object, Object) will always fail. |
void |
setValue(ELContext context,
java.lang.Object base,
java.lang.Object property,
java.lang.Object value)
If the base object is not null, attempts to set the value of the given property on this bean. |
Methods inherited from class java.lang.Object |
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clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait |
Constructor Detail |
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public BeanELResolver()
public BeanELResolver(boolean readOnly)
Method Detail |
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public java.lang.Class<?> getCommonPropertyType(ELContext context, java.lang.Object base)
getCommonPropertyType
in class ELResolver
context
- The context of this evaluation.base
- The bean to analyze.
public java.util.Iterator<java.beans.FeatureDescriptor> getFeatureDescriptors(ELContext context, java.lang.Object base)
ELResolver.TYPE
- The runtime type of the property, from
PropertyDescriptor.getPropertyType().ELResolver.RESOLVABLE_AT_DESIGN_TIME
- true.
getFeatureDescriptors
in class ELResolver
context
- The context of this evaluation.base
- The bean to analyze.
public java.lang.Class<?> getType(ELContext context, java.lang.Object base, java.lang.Object property)
getType
in class ELResolver
context
- The context of this evaluation.base
- The bean to analyze.property
- The name of the property to analyze. Will be coerced to a String.
java.lang.NullPointerException
- if context is null
PropertyNotFoundException
- if base is not null and the specified property does not exist or is not readable.
ELException
- if an exception was thrown while performing the property or variable resolution.
The thrown exception must be included as the cause property of this exception, if
available.public java.lang.Object getValue(ELContext context, java.lang.Object base, java.lang.Object property)
getValue
in class ELResolver
context
- The context of this evaluation.base
- The bean to analyze.property
- The name of the property to analyze. Will be coerced to a String.
java.lang.NullPointerException
- if context is null
PropertyNotFoundException
- if base is not null and the specified property does not exist or is not readable.
ELException
- if an exception was thrown while performing the property or variable resolution.
The thrown exception must be included as the cause property of this exception, if
available.public boolean isReadOnly(ELContext context, java.lang.Object base, java.lang.Object property)
setValue(ELContext, Object, Object, Object)
will always fail. If the base is not
null, 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 can safely assume no value was set.
isReadOnly
in class ELResolver
context
- The context of this evaluation.base
- The bean to analyze.property
- The name of the property to analyze. Will be coerced to a String.
java.lang.NullPointerException
- if context is null
PropertyNotFoundException
- if base is not null and the specified property does not exist or is not readable.
ELException
- if an exception was thrown while performing the property or variable resolution.
The thrown exception must be included as the cause property of this exception, if
available.public void setValue(ELContext context, java.lang.Object base, java.lang.Object property, java.lang.Object value)
setValue
in class ELResolver
context
- The context of this evaluation.base
- The bean to analyze.property
- The name of the property to analyze. Will be coerced to a String.value
- The value to be associated with the specified key.
java.lang.NullPointerException
- if context is null
PropertyNotFoundException
- if base is not null and the specified property does not exist or is not readable.
PropertyNotWritableException
- if this resolver was constructed in read-only mode, or if there is no setter for
the property
ELException
- if an exception was thrown while performing the property or variable resolution.
The thrown exception must be included as the cause property of this exception, if
available.
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Copyright © 2006-2009 Odysseus Software GmbH. | ||||||||
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