Package com.storedobject.vaadin.util

Interface FieldValueHandler

All Known Implementing Classes:

AbstractForm.ValueHandler

public interface FieldValueHandler

Interface for handling field values dynamically. This interface defines various operations for retrieving, updating, and checking properties of fields such as visibility, editability, and basic handling capabilities.

Author:

Syam

Method Summary

Modifier and Type	Method	Description
boolean	canHandle(String fieldName)	Determines whether the handler can process the provided field name.
boolean	canSet(String fieldName)	Determines whether the specified field can be set to a value.
Object	getValue(String fieldName)	Retrieves the value associated with the specified field.
boolean	isBasic()	Determines whether the field value handler is considered basic.
boolean	isEditable(com.vaadin.flow.component.HasValue<?,?> field)	Checks if the given field is editable.
boolean	isEditable(String fieldName)	Checks whether the specified field is editable.
boolean	isVisible(com.vaadin.flow.component.HasValue<?,?> field)	Determines if the specified field is currently visible.
boolean	isVisible(String fieldName)	Checks whether the specified field is visible.
void	setValue(String fieldName, Object value)	Sets the value of the specified field.

Method Details

isBasic

boolean isBasic()

Determines whether the field value handler is considered basic.

Returns:

true if the handler is basic, false otherwise

canHandle

boolean canHandle(String fieldName)

Determines whether the handler can process the provided field name.

Parameters:

fieldName - the name of the field to check

Returns:

true if the handler can handle the field, false otherwise

canSet

boolean canSet(String fieldName)

Determines whether the specified field can be set to a value.

Parameters:

fieldName - the name of the field to check

Returns:

true if the field can be set, false otherwise

getValue

Object getValue(String fieldName)

Retrieves the value associated with the specified field.

Parameters:

fieldName - the name of the field whose value is to be retrieved

Returns:

the value of the specified field, or null if the field does not exist or is inaccessible

setValue

void setValue(String fieldName,
 Object value)

Sets the value of the specified field.

Parameters:

fieldName - the name of the field to set the value for

value - the value to be set for the specified field

isVisible

boolean isVisible(String fieldName)

Checks whether the specified field is visible.

Parameters:

fieldName - the name of the field to check visibility for

Returns:

true if the field is visible, false otherwise

isVisible

boolean isVisible(com.vaadin.flow.component.HasValue<?,?> field)

Determines if the specified field is currently visible.

Parameters:

field - the field to check for visibility, provided as an instance implementing HasValue

Returns:

true if the field is visible, false otherwise

isEditable

boolean isEditable(String fieldName)

Checks whether the specified field is editable.

Parameters:

fieldName - the name of the field to check

Returns:

true if the field is editable, false otherwise

isEditable

boolean isEditable(com.vaadin.flow.component.HasValue<?,?> field)

Checks if the given field is editable.

Parameters:

field - the field to be checked

Returns:

true if the field is editable, false otherwise