Package org.apache.jasper.el

Class JspValueExpression

java.lang.Object

javax.el.Expression

javax.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

Author:

Jacob Hookom

See Also:

Serialized Form

Constructor Summary

Constructors

Constructor	Description
JspValueExpression()
JspValueExpression(String mark, ValueExpression target)

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object obj)
Class<?>	getExpectedType()
String	getExpressionString()
Class<?>	getType(ELContext context)
Object	getValue(ELContext context)
int	hashCode()
boolean	isLiteralText()
boolean	isReadOnly(ELContext context)
void	readExternal(ObjectInput in)
void	setValue(ELContext context, Object value)
void	writeExternal(ObjectOutput out)

Methods inherited from class javax.el.ValueExpression

getValueReference

Methods inherited from class java.lang.Object

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

Constructor Detail

JspValueExpression

public JspValueExpression()

JspValueExpression

public JspValueExpression(String mark,
                          ValueExpression target)

Method Detail

getExpectedType

public Class<?> getExpectedType()

Specified by:

getExpectedType in class ValueExpression

getType

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

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

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

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 Object getValue(ELContext context)
                throws NullPointerException,
                       PropertyNotFoundException,
                       ELException

Specified by:

getValue in class ValueExpression

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()

Specified by:

getExpressionString in class Expression

isLiteralText

public boolean isLiteralText()

Specified by:

isLiteralText in class Expression

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