javax.el

Class ValueExpression

java.lang.Object

javax.el.Expression

javax.el.ValueExpression

public abstract class ValueExpression
extends Expression

Expression representing a variable.

Since:

2.1

Constructor Summary

Constructors

Constructor and Description
ValueExpression()

Method Summary

Methods

Modifier and Type	Method and Description
abstract java.lang.Class	getExpectedType() Returns the type of this variable after evaluation.
abstract java.lang.Class	getType(ELContext context) Returns the most general type that a call to setValue(javax.el.ELContext, java.lang.Object) will accept.
abstract java.lang.Object	getValue(ELContext context) Returns the associated value.
abstract boolean	isReadOnly(ELContext context) Indicates whether this variable is read-only.
abstract void	setValue(ELContext context, java.lang.Object value) Sets the associated value.

Methods inherited from class javax.el.Expression

equals, getExpressionString, hashCode, isLiteralText

Methods inherited from class java.lang.Object

clone, finalize, getClass, notify, notifyAll, toString, wait, wait, wait

Constructor Detail

ValueExpression

public ValueExpression()

Method Detail

getValue

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

Returns the associated value.

Throws:

java.lang.NullPointerException

PropertyNotFoundException

ELException

setValue

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

Sets the associated value.

Throws:

java.lang.NullPointerException

PropertyNotFoundException

PropertyNotWritableException

ELException

isReadOnly

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

Indicates whether this variable is read-only.

Throws:

java.lang.NullPointerException

PropertyNotFoundException

ELException

getType

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

Returns the most general type that a call to setValue(javax.el.ELContext, java.lang.Object) will accept.

Throws:

java.lang.NullPointerException

PropertyNotFoundException

ELException

getExpectedType

public abstract java.lang.Class getExpectedType()

Returns the type of this variable after evaluation.