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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.ListELResolver

ListELResolver
public class ListELResolver extends ELResolver (Code)
Defines property resolution behavior on instances of java.util.List .

This resolver handles base objects of type java.util.List. It accepts any object as a property and coerces that object into an integer index into the list. The resulting value is the value in the list at that index.

This resolver can be constructed in read-only mode, which means that ListELResolver.isReadOnly will always return true and ListELResolver.setValue 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.


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



Constructor Summary
public  ListELResolver()
     Creates a new read/write ListELResolver.
public  ListELResolver(boolean isReadOnly)
     Creates a new ListELResolver whose read-only status is determined by the given parameter.

Method Summary
public  ClassgetCommonPropertyType(ELContext context, Object base)
     If the base object is a list, returns the most general type that this resolver accepts for the property argument. Otherwise, returns null.

Assuming the base is a List, this method will always return Integer.class.

public  Iterator<FeatureDescriptor>getFeatureDescriptors(ELContext context, Object base)
     Always returns null, since there is no reason to iterate through set set of all integers.

The ListELResolver.getCommonPropertyType method returns sufficient information about what properties this resolver accepts.


Parameters:
  context - The context of this evaluation.
Parameters:
  base - The list.
public  ClassgetType(ELContext context, Object base, Object property)
     If the base object is a list, returns the most general acceptable type for a value in this list.

If the base is a List, the propertyResolved property of the ELContext object must be set to true by this resolver, before returning.

public  ObjectgetValue(ELContext context, Object base, Object property)
     If the base object is a list, returns the value at the given index. The index is specified by the property argument, and coerced into an integer.
public  booleanisReadOnly(ELContext context, Object base, Object property)
     If the base object is a list, returns whether a call to ListELResolver.setValue will always fail.

If the base is a List, the propertyResolved property of the ELContext object must be set to true by this resolver, before returning.

public  voidsetValue(ELContext context, Object base, Object property, Object val)
     If the base object is a list, attempts to set the value at the given index with the given value.


Constructor Detail
ListELResolver
public ListELResolver()(Code)
Creates a new read/write ListELResolver.



ListELResolver
public ListELResolver(boolean isReadOnly)(Code)
Creates a new ListELResolver whose read-only status is determined by the given parameter.
Parameters:
  isReadOnly - true if this resolver cannot modifylists; false otherwise.




Method Detail
getCommonPropertyType
public Class getCommonPropertyType(ELContext context, Object base)(Code)
If the base object is a list, returns the most general type that this resolver accepts for the property argument. Otherwise, returns null.

Assuming the base is a List, this method will always return Integer.class. This is because Lists accept integers as their index.


Parameters:
  context - The context of this evaluation.
Parameters:
  base - The list to analyze. Only bases of type Listare handled by this resolver. null if base is not a List; otherwiseInteger.class.



getFeatureDescriptors
public Iterator<FeatureDescriptor> getFeatureDescriptors(ELContext context, Object base)(Code)
Always returns null, since there is no reason to iterate through set set of all integers.

The ListELResolver.getCommonPropertyType method returns sufficient information about what properties this resolver accepts.


Parameters:
  context - The context of this evaluation.
Parameters:
  base - The list. Only bases of type List are handled by this resolver. null.



getType
public Class getType(ELContext context, Object base, Object property)(Code)
If the base object is a list, returns the most general acceptable type for a value in this list.

If the base is a List, 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.

Assuming the base is a List, this method will always return Object.class. This is because Lists accept any object as an element.


Parameters:
  context - The context of this evaluation.
Parameters:
  base - The list to analyze. Only bases of type Listare handled by this resolver.
Parameters:
  property - The index of the element in the list to return the acceptable type for. Will be coerced into an integer, but otherwise ignored by this resolver. If the propertyResolved property of ELContext was set to true, thenthe most general acceptable type; otherwise undefined.
throws:
  PropertyNotFoundException - if the given index is out of bounds for this list.
throws:
  NullPointerException - if context is null
throws:
  ELException - if an exception was thrown while performingthe property or variable resolution. The thrown exceptionmust be included as the cause property of this exception, ifavailable.



getValue
public Object getValue(ELContext context, Object base, Object property)(Code)
If the base object is a list, returns the value at the given index. The index is specified by the property argument, and coerced into an integer. If the coercion could not be performed, an IllegalArgumentException is thrown. If the index is out of bounds, null is returned.

If the base is a List, 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 list to be analyzed. Only bases of type List are handled by this resolver.
Parameters:
  property - The index of the value to be returned. Will be coercedinto an integer. If the propertyResolved property of ELContext was set to true, thenthe value at the given index or nullif the index was out of bounds. Otherwise, undefined.
throws:
  IllegalArgumentException - if the property could not be coercedinto an integer.
throws:
  NullPointerException - if context is null.
throws:
  ELException - if an exception was thrown while performingthe property or variable resolution. The thrown exceptionmust be included as the cause property of this exception, ifavailable.



isReadOnly
public boolean isReadOnly(ELContext context, Object base, Object property)(Code)
If the base object is a list, returns whether a call to ListELResolver.setValue will always fail.

If the base is a List, 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 this resolver was constructed in read-only mode, this method will always return true.

If a List was created using java.util.Collections.unmodifiableList , this method must return true. Unfortunately, there is no Collections API method to detect this. However, an implementation can create a prototype unmodifiable List and query its runtime type to see if it matches the runtime type of the base object as a workaround.


Parameters:
  context - The context of this evaluation.
Parameters:
  base - The list to analyze. Only bases of type Listare handled by this resolver.
Parameters:
  property - The index of the element in the list to return the acceptable type for. Will be coerced into an integer, but otherwise ignored by this resolver. If the propertyResolved property of ELContext was set to true, thentrue if calling the setValue methodwill always fail or false if it is possible thatsuch a call may succeed; otherwise undefined.
throws:
  PropertyNotFoundException - if the given index is out of bounds for this list.
throws:
  NullPointerException - if context is null
throws:
  ELException - if an exception was thrown while performingthe property or variable resolution. The thrown exceptionmust be included as the cause property of this exception, ifavailable.



setValue
public void setValue(ELContext context, Object base, Object property, Object val)(Code)
If the base object is a list, attempts to set the value at the given index with the given value. The index is specified by the property argument, and coerced into an integer. If the coercion could not be performed, an IllegalArgumentException is thrown. If the index is out of bounds, a PropertyNotFoundException is thrown.

If the base is a List, 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.

If this resolver was constructed in read-only mode, this method will always throw PropertyNotWritableException.

If a List was created using java.util.Collections.unmodifiableList , this method must throw PropertyNotWritableException. Unfortunately, there is no Collections API method to detect this. However, an implementation can create a prototype unmodifiable List and query its runtime type to see if it matches the runtime type of the base object as a workaround.


Parameters:
  context - The context of this evaluation.
Parameters:
  base - The list to be modified. Only bases of type List are handled by this resolver.
Parameters:
  property - The index of the value to be set. Will be coercedinto an integer.
Parameters:
  val - The value to be set at the given index.
throws:
  ClassCastException - if the class of the specified element prevents it from being added to this list.
throws:
  NullPointerException - if context is null, orif the value is null and this Listdoes not support null elements.
throws:
  IllegalArgumentException - if the property could not be coercedinto an integer, or if some aspect of the specified element prevents it from being added to this list.
throws:
  PropertyNotWritableException - if this resolver was constructedin read-only mode, or if the set operation is not supported by the underlying list.
throws:
  PropertyNotFoundException - if the given index is out of bounds for this list.
throws:
  ELException - if an exception was thrown while performingthe property or variable resolution. The thrown exceptionmust be included as the cause property of this exception, ifavailable.



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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