Class JspValueExpression

java.lang.Object

jakarta.el.Expression

jakarta.el.ValueExpression

org.apache.jasper.el.JspValueExpression

All Implemented Interfaces:

Externalizable, Serializable

public final class JspValueExpression
extends ValueExpression
implements Externalizable

Wrapper for providing context to ValueExpressions.

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
JspValueExpression()	Default constructor for deserialization.
JspValueExpression(String mark, ValueExpression target)	Constructs an instance with the given mark and target expression.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
Class<?>	getExpectedType()	Returns the expected type of the result of this expression.
String	getExpressionString()	Returns the original string representation of this EL expression as it was parsed.
Class<?>	getType(ELContext context)	Returns the type of the result produced by evaluating this expression.
<T> T	getValue(ELContext context)	Evaluates this expression and returns the result.
int	hashCode()
boolean	isLiteralText()	Returns whether this expression is a literal text expression, meaning it does not contain any variables, functions, or operators and evaluates to a constant value.
boolean	isReadOnly(ELContext context)	Determines whether the property referenced by this expression is read-only.
void	readExternal(ObjectInput in)
void	setValue(ELContext context, Object value)	Sets the value of the property referenced by this expression.
void	writeExternal(ObjectOutput out)

Methods inherited from class ValueExpression

getValueReference

Methods inherited from class Object

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

Constructor Details

JspValueExpression

public JspValueExpression()

Default constructor for deserialization.

JspValueExpression

public JspValueExpression(String mark,
 ValueExpression target)

Constructs an instance with the given mark and target expression.

Parameters:

mark - The mark string

target - The target value expression

Method Details

getExpectedType

public Class<?> getExpectedType()

Description copied from class: jakarta.el.ValueExpression

Returns the expected type of the result of this expression.

Specified by:

getExpectedType in class ValueExpression

Returns:

The expected result type, or Object.class if no specific type is expected

getType

public Class<?> getType(ELContext context)
                 throws NullPointerException,
PropertyNotFoundException,
ELException

Description copied from class: jakarta.el.ValueExpression

Returns the type of the result produced by evaluating this expression.

Specified by:

getType in class ValueExpression

Parameters:

context - The EL context for this evaluation

Returns:

The type of the result of this value expression

Throws:

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 boolean isReadOnly(ELContext context)
                   throws NullPointerException,
PropertyNotFoundException,
ELException

Description copied from class: jakarta.el.ValueExpression

Determines whether the property referenced by this expression is read-only.

Specified by:

isReadOnly in class ValueExpression

Parameters:

context - The EL context for this evaluation

Returns:

true if this expression is read only otherwise false

Throws:

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 void setValue(ELContext context,
 Object value)
              throws NullPointerException,
PropertyNotFoundException,
PropertyNotWritableException,
ELException

Description copied from class: jakarta.el.ValueExpression

Sets the value of the property referenced by this expression.

Specified by:

setValue in class ValueExpression

Parameters:

context - The EL context for this evaluation

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

Throws:

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 <T> T getValue(ELContext context)
               throws NullPointerException,
PropertyNotFoundException,
ELException

Description copied from class: jakarta.el.ValueExpression

Evaluates this expression and returns the result.

Specified by:

getValue in class ValueExpression

Type Parameters:

T - The expected type for the result of evaluating this value expression

Parameters:

context - The EL context for this evaluation

Returns:

The result of evaluating this value expression

Throws:

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

equals

public boolean equals(Object obj)

Specified by:

equals in class Expression

hashCode

public int hashCode()

Specified by:

hashCode in class Expression

getExpressionString

public String getExpressionString()

Description copied from class: jakarta.el.Expression

Returns the original string representation of this EL expression as it was parsed.

Specified by:

getExpressionString in class Expression

Returns:

the string representation of this expression

isLiteralText

public boolean isLiteralText()

Description copied from class: jakarta.el.Expression

Returns whether this expression is a literal text expression, meaning it does not contain any variables, functions, or operators and evaluates to a constant value.

Specified by:

isLiteralText in class Expression

Returns:

true if this expression is a literal text, false otherwise

writeExternal

public void writeExternal(ObjectOutput out)
                   throws IOException

Specified by:

writeExternal in interface Externalizable

Throws:

IOException

readExternal

public void readExternal(ObjectInput in)
                  throws IOException,
ClassNotFoundException

Specified by:

readExternal in interface Externalizable

Throws:

IOException

ClassNotFoundException