Constructor Detail

• ValueExpression

  public ValueExpression()

Method Detail

• getExpectedType

  public abstract java.lang.Class<?> getExpectedType()

• getType

  public abstract java.lang.Class<?> getType(ELContext context)
                                      throws java.lang.NullPointerException,
                                             PropertyNotFoundException,
                                             ELException

  Parameters:

  context - The EL context for this evaluation

  Returns:

  The type of the result of this value expression

  Throws:

  java.lang.NullPointerException - If the supplied context is null

  PropertyNotFoundException - If a property/variable resolution failed because no match was found or a match was found but was not readable

  ELException - Wraps any exception throw whilst resolving a property or variable

• isReadOnly

  public abstract boolean isReadOnly(ELContext context)
                              throws java.lang.NullPointerException,
                                     PropertyNotFoundException,
                                     ELException

  Parameters:

  context - The EL context for this evaluation

  Returns:

  true if this expression is read only otherwise false

  Throws:

  java.lang.NullPointerException - If the supplied context is null

  PropertyNotFoundException - If a property/variable resolution failed because no match was found or a match was found but was not readable

  ELException - Wraps any exception throw whilst resolving a property or variable

• setValue

  public abstract void setValue(ELContext context,
              java.lang.Object value)
                         throws java.lang.NullPointerException,
                                PropertyNotFoundException,
                                PropertyNotWritableException,
                                ELException

  Parameters:

  context - The EL context for this evaluation

  value - The value to set the property to which this value expression refers

  Throws:

  java.lang.NullPointerException - If the supplied context is null

  PropertyNotFoundException - If a property/variable resolution failed because no match was found

  PropertyNotWritableException - If a property/variable resolution failed because a match was found but was not writable

  ELException - Wraps any exception throw whilst resolving a property or variable

• getValue

  public abstract java.lang.Object getValue(ELContext context)
                                     throws java.lang.NullPointerException,
                                            PropertyNotFoundException,
                                            ELException

  Parameters:

  context - The EL context for this evaluation

  Returns:

  The result of evaluating this value expression

  Throws:

  java.lang.NullPointerException - If the supplied context is null

  PropertyNotFoundException - If a property/variable resolution failed because no match was found or a match was found but was not readable

  ELException - Wraps any exception throw whilst resolving a property or variable

• getValueReference

  public ValueReference getValueReference(ELContext context)

  Parameters:

  context - The EL context for this evaluation

  Returns:

  This default implementation always returns null

  Since:

  EL 2.2