/*
* Copyright 2002-2012 the original author or authors.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
package org.springframework.expression.spel.support;
import java.beans.PropertyEditor;
import org.springframework.beans.BeansException;
import org.springframework.beans.SimpleTypeConverter;
import org.springframework.beans.factory.BeanFactory;
import org.springframework.beans.factory.BeanFactoryAware;
import org.springframework.beans.factory.config.ConfigurableBeanFactory;
import org.springframework.core.convert.ConversionService;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.core.convert.support.DefaultConversionService;
import org.springframework.expression.TypeConverter;
/**
* Copied from Spring Integration for purposes of reproducing
* {@link Spr7538Tests}.
*/
class BeanFactoryTypeConverter implements TypeConverter, BeanFactoryAware {
private SimpleTypeConverter delegate = new SimpleTypeConverter();
private static ConversionService defaultConversionService;
private ConversionService conversionService;
public BeanFactoryTypeConverter() {
synchronized (this) {
if (defaultConversionService == null) {
defaultConversionService = new DefaultConversionService();
}
}
this.conversionService = defaultConversionService;
}
public BeanFactoryTypeConverter(ConversionService conversionService) {
this.conversionService = conversionService;
}
public void setConversionService(ConversionService conversionService) {
this.conversionService = conversionService;
}
@Override
public void setBeanFactory(BeanFactory beanFactory) throws BeansException {
if (beanFactory instanceof ConfigurableBeanFactory) {
Object typeConverter = ((ConfigurableBeanFactory) beanFactory).getTypeConverter();
if (typeConverter instanceof SimpleTypeConverter) {
delegate = (SimpleTypeConverter) typeConverter;
}
}
}
public boolean canConvert(Class<?> sourceType, Class<?> targetType) {
if (conversionService.canConvert(sourceType, targetType)) {
return true;
}
if (!String.class.isAssignableFrom(sourceType) && !String.class.isAssignableFrom(targetType)) {
// PropertyEditor cannot convert non-Strings
return false;
}
if (!String.class.isAssignableFrom(sourceType)) {
return delegate.findCustomEditor(sourceType, null) != null || delegate.getDefaultEditor(sourceType) != null;
}
return delegate.findCustomEditor(targetType, null) != null || delegate.getDefaultEditor(targetType) != null;
}
@Override
public boolean canConvert(TypeDescriptor sourceTypeDescriptor, TypeDescriptor targetTypeDescriptor) {
if (conversionService.canConvert(sourceTypeDescriptor, targetTypeDescriptor)) {
return true;
}
// TODO: what does this mean? This method is not used in SpEL so probably ignorable?
Class<?> sourceType = sourceTypeDescriptor.getObjectType();
Class<?> targetType = targetTypeDescriptor.getObjectType();
return canConvert(sourceType, targetType);
}
@Override
public Object convertValue(Object value, TypeDescriptor sourceType, TypeDescriptor targetType) {
if (targetType.getType() == Void.class || targetType.getType() == Void.TYPE) {
return null;
}
if (conversionService.canConvert(sourceType, targetType)) {
return conversionService.convert(value, sourceType, targetType);
}
if (!String.class.isAssignableFrom(sourceType.getType())) {
PropertyEditor editor = delegate.findCustomEditor(sourceType.getType(), null);
editor.setValue(value);
return editor.getAsText();
}
return delegate.convertIfNecessary(value, targetType.getType());
}
}