Module org.omnifaces

Package org.omnifaces.el

Class ReadOnlyValueExpression

java.lang.Object

jakarta.el.Expression

jakarta.el.ValueExpression

org.omnifaces.el.ReadOnlyValueExpression

All Implemented Interfaces:

Serializable

public class ReadOnlyValueExpression
extends ValueExpression

Implementation of a read only value expression that can be used when the value is not yet available at construction time, or when the value would be too expensive to create and it's not yet clear if the expression will actually be evaluated.

A callback (lambda in Java 8) that obtains the value can be provided, or the getValue() method can be overridden.

Since:

2.0

Author:

Arjan Tijms

See Also:

• Serialized Form

Constructor Summary

Constructors

Constructor	Description
ReadOnlyValueExpression()	Construct a read only value expression.
ReadOnlyValueExpression(Class<?> expectedType)	Construct a read only value expression.
ReadOnlyValueExpression(Class<?> expectedType, FunctionalInterfaces.SerializableSupplier<Object> callback)	Construct a read only value expression.

Method Summary

Modifier and Type	Method	Description
boolean	equals(Object object)
FunctionalInterfaces.SerializableSupplier<Object>	getCallback()	Returns the functional interface that will be called when the value expression is resolved
Class<?>	getExpectedType()
String	getExpressionString()
Class<?>	getType(ELContext context)
<T> T	getValue(ELContext context)
int	hashCode()
boolean	isLiteralText()
boolean	isReadOnly(ELContext context)
void	setCallback(FunctionalInterfaces.SerializableSupplier<Object> callback)	Sets the functional interface that will be called when the value expression is resolved
void	setValue(ELContext context, Object value)

Methods inherited from class jakarta.el.ValueExpression

getValueReference

Methods inherited from class java.lang.Object

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

Constructor Details

ReadOnlyValueExpression

public ReadOnlyValueExpression(Class<?> expectedType,
 FunctionalInterfaces.SerializableSupplier<Object> callback)

Construct a read only value expression.

Parameters:

expectedType - The type the result of the expression will be coerced to after evaluation.

callback - The functional interface that will be called when the value expression is resolved.

ReadOnlyValueExpression

public ReadOnlyValueExpression(Class<?> expectedType)

Construct a read only value expression.

Parameters:

expectedType - The type the result of the expression will be coerced to after evaluation.

ReadOnlyValueExpression

public ReadOnlyValueExpression()

Construct a read only value expression.

Method Details

getValue

public <T> T getValue(ELContext context)

Specified by:

getValue in class ValueExpression

setValue

public void setValue(ELContext context,
 Object value)

Specified by:

setValue in class ValueExpression

isReadOnly

public boolean isReadOnly(ELContext context)

Specified by:

isReadOnly in class ValueExpression

getType

public Class<?> getType(ELContext context)

Specified by:

getType in class ValueExpression

getExpectedType

public Class<?> getExpectedType()

Specified by:

getExpectedType in class ValueExpression

getExpressionString

public String getExpressionString()

Specified by:

getExpressionString in class Expression

equals

public boolean equals(Object object)

Specified by:

equals in class Expression

hashCode

public int hashCode()

Specified by:

hashCode in class Expression

isLiteralText

public boolean isLiteralText()

Specified by:

isLiteralText in class Expression

getCallback

public FunctionalInterfaces.SerializableSupplier<Object> getCallback()

Returns the functional interface that will be called when the value expression is resolved

Returns:

the functional interface that will be called when the value expression is resolved

Since:

2.1

setCallback

public void setCallback(FunctionalInterfaces.SerializableSupplier<Object> callback)

Sets the functional interface that will be called when the value expression is resolved

Parameters:

callback - functional interface returning what the value expression will return

Since:

2.1