/*
* Copyright 2002-2009 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.beans;
import org.springframework.core.MethodParameter;
/**
* Interface that defines type conversion methods. Typically (but not necessarily)
* implemented in conjunction with the PropertyEditorRegistry interface.
*
* @author Juergen Hoeller
* @since 2.0
* @see PropertyEditorRegistry
* @see SimpleTypeConverter
* @see BeanWrapperImpl
*/
public interface TypeConverter {
/**
* Convert the value to the required type (if necessary from a String).
* <p>Conversions from String to any type will typically use the <code>setAsText</code>
* method of the PropertyEditor class. Note that a PropertyEditor must be registered
* for the given class for this to work; this is a standard JavaBeans API.
* A number of PropertyEditors are automatically registered.
* @param value the value to convert
* @param requiredType the type we must convert to
* (or <code>null</code> if not known, for example in case of a collection element)
* @return the new value, possibly the result of type conversion
* @throws TypeMismatchException if type conversion failed
* @see java.beans.PropertyEditor#setAsText(String)
* @see java.beans.PropertyEditor#getValue()
*/
<T> T convertIfNecessary(Object value, Class<T> requiredType) throws TypeMismatchException;
/**
* Convert the value to the required type (if necessary from a String).
* <p>Conversions from String to any type will typically use the <code>setAsText</code>
* method of the PropertyEditor class. Note that a PropertyEditor must be registered
* for the given class for this to work; this is a standard JavaBeans API.
* A number of PropertyEditors are automatically registered.
* @param value the value to convert
* @param requiredType the type we must convert to
* (or <code>null</code> if not known, for example in case of a collection element)
* @param methodParam the method parameter that is the target of the conversion
* (for analysis of generic types; may be <code>null</code>)
* @return the new value, possibly the result of type conversion
* @throws TypeMismatchException if type conversion failed
* @see java.beans.PropertyEditor#setAsText(String)
* @see java.beans.PropertyEditor#getValue()
*/
<T> T convertIfNecessary(Object value, Class<T> requiredType, MethodParameter methodParam)
throws TypeMismatchException;
}
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