org.omnifaces.el

Class ReadOnlyValueExpression

java.lang.Object

javax.el.Expression

javax.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 and Description
ReadOnlyValueExpression()
ReadOnlyValueExpression(Class<?> expectedType)
ReadOnlyValueExpression(Class<?> expectedType, Callback.ReturningWithArgument<Object,ELContext> callbackWithArgument)
ReadOnlyValueExpression(Class<?> expectedType, Callback.SerializableReturning<Object> callbackReturning)

Method Summary

Modifier and Type	Method and Description
boolean	equals(Object object)
Callback.SerializableReturning<Object>	getCallbackReturning() Returns the functional interface that will be called when the value expression is resolved
Callback.ReturningWithArgument<Object,ELContext>	getCallbackWithArgument() Returns the functional interface that will be called when the value expression is resolved and which receives the proper ELContext.
Class<?>	getExpectedType()
String	getExpressionString()
Class<?>	getType(ELContext context)
Object	getValue(ELContext context)
int	hashCode()
boolean	isLiteralText()
boolean	isReadOnly(ELContext context)
void	setCallbackReturning(Callback.SerializableReturning<Object> callbackReturning) Sets the functional interface that will be called when the value expression is resolved
void	setCallbackWithArgument(Callback.ReturningWithArgument<Object,ELContext> callbackWithArgument) Sets the functional interface that will be called when the value expression is resolved and which receives the proper ELContext.
void	setValue(ELContext context, Object value)

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

ReadOnlyValueExpression

public ReadOnlyValueExpression(Class<?> expectedType,
                               Callback.SerializableReturning<Object> callbackReturning)

ReadOnlyValueExpression

public ReadOnlyValueExpression(Class<?> expectedType,
                               Callback.ReturningWithArgument<Object,ELContext> callbackWithArgument)

ReadOnlyValueExpression

public ReadOnlyValueExpression(Class<?> expectedType)

ReadOnlyValueExpression

public ReadOnlyValueExpression()

Method Detail

getValue

public Object 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

getCallbackWithArgument

public Callback.ReturningWithArgument<Object,ELContext> getCallbackWithArgument()

Returns the functional interface that will be called when the value expression is resolved and which receives the proper ELContext.

Returns:

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

Since:

2.1

setCallbackWithArgument

public void setCallbackWithArgument(Callback.ReturningWithArgument<Object,ELContext> callbackWithArgument)

Sets the functional interface that will be called when the value expression is resolved and which receives the proper ELContext.

Parameters:

callbackWithArgument - functional interface returning what the value expression will return

Since:

2.1

getCallbackReturning

public Callback.SerializableReturning<Object> getCallbackReturning()

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

setCallbackReturning

public void setCallbackReturning(Callback.SerializableReturning<Object> callbackReturning)

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

Parameters:

callbackReturning - functional interface returning what the value expression will return

Since:

2.1