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/*
* Vaadin Framework 7
*
* Copyright (C) 2000-2024 Vaadin Ltd
*
* This program is available under Vaadin Commercial License and Service Terms.
*
* See for the full
* license.
*/
package com.vaadin.data.util.converter;
import java.io.Serializable;
import java.util.Locale;
import com.vaadin.server.VaadinSession;
public class ConverterUtil implements Serializable {
/**
* Finds a converter that can convert from the given presentation type to
* the given model type and back. Uses the given application to find a
* {@link ConverterFactory} or, if application is null, uses the
* {@link VaadinSession#getCurrent()}.
*
* @param
* the presentation type
* @param
* the model type
* @param presentationType
* the presentation type
* @param modelType
* the model type
* @param session
* the session to use to find a ConverterFactory or null to use
* the current session
* @return a Converter capable of converting between the given types or null
* if no converter was found
*/
public static Converter getConverter(
Class presentationType,
Class modelType, VaadinSession session) {
Converter converter = null;
if (session == null) {
session = VaadinSession.getCurrent();
}
if (session != null) {
ConverterFactory factory = session.getConverterFactory();
converter = factory.createConverter(presentationType, modelType);
}
return converter;
}
/**
* Convert the given value from the data source type to the UI type.
*
* @param modelValue
* the model value to convert
* @param presentationType
* the type of the presentation value
* @param converter
* the converter to use
* @param locale
* the locale to use for conversion
* @param
* the presentation type
* @param
* the model type
*
* @return the converted value, compatible with the presentation type, or
* the original value if its type is compatible and no converter is
* set.
* @throws Converter.ConversionException
* if there was a problem converting the value
*/
@SuppressWarnings("unchecked")
public static PRESENTATIONTYPE convertFromModel(
MODELTYPE modelValue,
Class presentationType,
Converter converter, Locale locale)
throws Converter.ConversionException {
if (converter != null) {
/*
* If there is a converter, always use it. It must convert or throw
* an exception.
*/
PRESENTATIONTYPE presentation = converter.convertToPresentation(
modelValue, presentationType, locale);
if (presentation != null
&& !presentationType.isInstance(presentation)) {
throw new Converter.ConversionException(
"Converter returned an object of type "
+ presentation.getClass().getName()
+ " when expecting "
+ presentationType.getName());
}
return presentation;
}
if (modelValue == null) {
// Null should always be passed through the converter but if there
// is no converter we can safely return null
return null;
}
if (presentationType.isAssignableFrom(modelValue.getClass())) {
return (PRESENTATIONTYPE) modelValue;
} else {
throw new Converter.ConversionException(
"Unable to convert value of type "
+ modelValue.getClass().getName()
+ " to presentation type " + presentationType
+ ". No converter is set and the types are not compatible.");
}
}
/**
* Convert the given value from the presentation (UI) type to model (data
* source) type.
*
* @param presentationValue
* the presentation value to convert
* @param modelType
* the type of the model
* @param converter
* the converter to use
* @param locale
* the locale to use for conversion
* @param
* the presentation type
* @param
* the model type
*
* @return the converted value, compatible with the model type, or the
* original value if its type is compatible and no converter is set.
* @throws Converter.ConversionException
* if there was a problem converting the value
*/
public static MODELTYPE convertToModel(
PRESENTATIONTYPE presentationValue, Class modelType,
Converter converter, Locale locale)
throws Converter.ConversionException {
if (converter != null) {
/*
* If there is a converter, always use it. It must convert or throw
* an exception.
*/
MODELTYPE model = converter.convertToModel(presentationValue,
modelType, locale);
if (model != null && !modelType.isInstance(model)) {
throw new Converter.ConversionException(
"Converter returned an object of type "
+ model.getClass().getName()
+ " when expecting " + modelType.getName());
}
return model;
}
if (presentationValue == null) {
// Null should always be passed through the converter but if there
// is no converter we can safely return null
return null;
}
if (modelType == null) {
// No model type, return original value
return (MODELTYPE) presentationValue;
} else if (modelType.isAssignableFrom(presentationValue.getClass())) {
// presentation type directly compatible with model type
return modelType.cast(presentationValue);
} else {
throw new Converter.ConversionException(
"Unable to convert value of type "
+ presentationValue.getClass().getName()
+ " to model type " + modelType
+ ". No converter is set and the types are not compatible.");
}
}
/**
* Checks if the given converter can handle conversion between the given
* presentation and model type. Does strict type checking and only returns
* true if the converter claims it can handle exactly the given types.
*
* @see #canConverterPossiblyHandle(Converter, Class, Class)
*
* @param converter
* The converter to check. If this is null the result is always
* false.
* @param presentationType
* The presentation type
* @param modelType
* The model type
* @return true if the converter supports conversion between the given
* presentation and model type, false otherwise
*/
public static boolean canConverterHandle(Converter converter,
Class presentationType, Class modelType) {
if (converter == null) {
return false;
}
if (modelType != converter.getModelType()) {
return false;
}
if (presentationType != converter.getPresentationType()) {
return false;
}
return true;
}
/**
* Checks if it possible that the given converter can handle conversion
* between the given presentation and model type somehow.
*
* @param converter
* The converter to check. If this is null the result is always
* false.
* @param presentationType
* The presentation type
* @param modelType
* The model type
* @return true if the converter possibly support conversion between the
* given presentation and model type, false otherwise
*/
public static boolean canConverterPossiblyHandle(Converter converter,
Class presentationType, Class modelType) {
if (converter == null) {
return false;
}
Class converterModelType = converter.getModelType();
if (!modelType.isAssignableFrom(converterModelType)
&& !converterModelType.isAssignableFrom(modelType)) {
// model types are not compatible in any way
return false;
}
Class converterPresentationType = converter.getPresentationType();
if (!presentationType.isAssignableFrom(converterPresentationType)
&& !converterPresentationType
.isAssignableFrom(presentationType)) {
// presentation types are not compatible in any way
return false;
}
return true;
}
}
