spring TypeConverterSupport 源码
spring TypeConverterSupport 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/TypeConverterSupport.java
/*
* Copyright 2002-2019 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
*
* https://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.beans;
import java.lang.reflect.Field;
import org.springframework.core.MethodParameter;
import org.springframework.core.convert.ConversionException;
import org.springframework.core.convert.ConverterNotFoundException;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* Base implementation of the {@link TypeConverter} interface, using a package-private delegate.
* Mainly serves as base class for {@link BeanWrapperImpl}.
*
* @author Juergen Hoeller
* @since 3.2
* @see SimpleTypeConverter
*/
public abstract class TypeConverterSupport extends PropertyEditorRegistrySupport implements TypeConverter {
@Nullable
TypeConverterDelegate typeConverterDelegate;
@Override
@Nullable
public <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType) throws TypeMismatchException {
return convertIfNecessary(value, requiredType, TypeDescriptor.valueOf(requiredType));
}
@Override
@Nullable
public <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType,
@Nullable MethodParameter methodParam) throws TypeMismatchException {
return convertIfNecessary(value, requiredType,
(methodParam != null ? new TypeDescriptor(methodParam) : TypeDescriptor.valueOf(requiredType)));
}
@Override
@Nullable
public <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType, @Nullable Field field)
throws TypeMismatchException {
return convertIfNecessary(value, requiredType,
(field != null ? new TypeDescriptor(field) : TypeDescriptor.valueOf(requiredType)));
}
@Nullable
@Override
public <T> T convertIfNecessary(@Nullable Object value, @Nullable Class<T> requiredType,
@Nullable TypeDescriptor typeDescriptor) throws TypeMismatchException {
Assert.state(this.typeConverterDelegate != null, "No TypeConverterDelegate");
try {
return this.typeConverterDelegate.convertIfNecessary(null, null, value, requiredType, typeDescriptor);
}
catch (ConverterNotFoundException | IllegalStateException ex) {
throw new ConversionNotSupportedException(value, requiredType, ex);
}
catch (ConversionException | IllegalArgumentException ex) {
throw new TypeMismatchException(value, requiredType, ex);
}
}
}
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