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/*
* 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.expression.spel.support;
import org.springframework.core.convert.ConversionException;
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.expression.spel.SpelEvaluationException;
import org.springframework.expression.spel.SpelMessage;
import org.springframework.util.Assert;
/**
* Default implementation of the {@link TypeConverter} interface,
* delegating to a core Spring {@link ConversionService}.
*
* @author Juergen Hoeller
* @author Andy Clement
* @since 3.0
* @see org.springframework.core.convert.ConversionService
*/
public class StandardTypeConverter implements TypeConverter {
private static volatile ConversionService defaultConversionService;
private final ConversionService conversionService;
/**
* Create a StandardTypeConverter for the default ConversionService.
*/
public StandardTypeConverter() {
if (defaultConversionService == null) {
defaultConversionService = new DefaultConversionService();
}
this.conversionService = defaultConversionService;
}
/**
* Create a StandardTypeConverter for the given ConversionService.
* @param conversionService the ConversionService to delegate to
*/
public StandardTypeConverter(ConversionService conversionService) {
Assert.notNull(conversionService, "ConversionService must not be null");
this.conversionService = conversionService;
}
@Override
public boolean canConvert(TypeDescriptor sourceType, TypeDescriptor targetType) {
return this.conversionService.canConvert(sourceType, targetType);
}
@Override
public Object convertValue(Object value, TypeDescriptor sourceType, TypeDescriptor targetType) {
try {
return this.conversionService.convert(value, sourceType, targetType);
}
catch (ConversionException ex) {
throw new SpelEvaluationException(
ex, SpelMessage.TYPE_CONVERSION_ERROR, sourceType.toString(), targetType.toString());
}
}
}
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