/*
* Copyright 2002-2016 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.integration.util;
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;
import org.springframework.integration.history.MessageHistory;
import org.springframework.messaging.MessageHeaders;
import org.springframework.util.ClassUtils;
/**
* @author Dave Syer
* @author Oleg Zhurakousky
* @author Gary Russell
* @author Soby Chacko
*/
public class BeanFactoryTypeConverter implements TypeConverter, BeanFactoryAware {
private volatile SimpleTypeConverter delegate = new SimpleTypeConverter();
private volatile boolean haveCalledDelegateGetDefaultEditor;
private volatile ConversionService conversionService;
public BeanFactoryTypeConverter() {
this.conversionService = DefaultConversionService.getSharedInstance();
}
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) {
this.delegate = (SimpleTypeConverter) typeConverter;
}
}
}
public boolean canConvert(Class<?> sourceType, Class<?> targetType) {
if (this.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 this.delegate.findCustomEditor(sourceType, null) != null || this.getDefaultEditor(sourceType) != null;
}
return this.delegate.findCustomEditor(targetType, null) != null || this.getDefaultEditor(targetType) != null;
}
@Override
public boolean canConvert(TypeDescriptor sourceTypeDescriptor, TypeDescriptor targetTypeDescriptor) {
if (this.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) {
// Echoes org.springframework.expression.common.ExpressionUtils.convertTypedValue()
if ((targetType.getType() == Void.class || targetType.getType() == Void.TYPE) && value == null) {
return null;
}
/*
* INT-2630 Spring 3.1 now converts ALL arguments; we know we don't need to convert MessageHeaders
* or MessageHistory; the MapToMap converter requires a no-arg constructor.
* Also INT-2650 - don't convert large byte[]
*/
if (sourceType != null) {
Class<?> sourceClass = sourceType.getType();
Class<?> targetClass = targetType.getType();
if ((sourceClass == MessageHeaders.class && targetClass == MessageHeaders.class) ||
(sourceClass == MessageHistory.class && targetClass == MessageHistory.class) ||
(sourceType.isAssignableTo(targetType) && ClassUtils.isPrimitiveArray(sourceClass))) {
return value;
}
}
if (this.conversionService.canConvert(sourceType, targetType)) {
return this.conversionService.convert(value, sourceType, targetType);
}
if (!String.class.isAssignableFrom(sourceType.getType())) {
PropertyEditor editor = this.delegate.findCustomEditor(sourceType.getType(), null);
if (editor == null) {
editor = this.getDefaultEditor(sourceType.getType());
}
if (editor != null) { // INT-1441
String text = null;
synchronized (editor) {
editor.setValue(value);
text = editor.getAsText();
}
if (String.class.isAssignableFrom(targetType.getType())) {
return text;
}
return convertValue(text, TypeDescriptor.valueOf(String.class), targetType);
}
}
synchronized (this.delegate) {
return this.delegate.convertIfNecessary(value, targetType.getType());
}
}
private PropertyEditor getDefaultEditor(Class<?> sourceType) {
PropertyEditor defaultEditor;
if (this.haveCalledDelegateGetDefaultEditor) {
defaultEditor = this.delegate.getDefaultEditor(sourceType);
}
else {
synchronized (this) {
// not thread-safe - it builds the defaultEditors field in-place (SPR-10191)
defaultEditor = this.delegate.getDefaultEditor(sourceType);
}
this.haveCalledDelegateGetDefaultEditor = true;
}
return defaultEditor;
}
}