spring TypeConverter 源码
spring TypeConverter 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/TypeConverter.java
/*
* Copyright 2002-2021 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.expression;
import org.springframework.core.convert.TypeDescriptor;
import org.springframework.lang.Nullable;
/**
* A type converter can convert values between different types encountered during
* expression evaluation. This is an SPI for the expression parser; see
* {@link org.springframework.core.convert.ConversionService} for the primary
* user API to Spring's conversion facilities.
*
* @author Andy Clement
* @author Juergen Hoeller
* @since 3.0
*/
public interface TypeConverter {
/**
* Return {@code true} if the type converter can convert the specified type
* to the desired target type.
* @param sourceType a type descriptor that describes the source type
* @param targetType a type descriptor that describes the requested result type
* @return {@code true} if that conversion can be performed
*/
boolean canConvert(@Nullable TypeDescriptor sourceType, TypeDescriptor targetType);
/**
* Convert (or coerce) a value from one type to another, for example from a
* {@code boolean} to a {@code String}.
* <p>The {@link TypeDescriptor} parameters enable support for typed collections:
* A caller may prefer a {@code List<Integer>}, for example, rather than
* simply any {@code List}.
* @param value the value to be converted
* @param sourceType a type descriptor that supplies extra information about the
* source object
* @param targetType a type descriptor that supplies extra information about the
* requested result type
* @return the converted value
* @throws EvaluationException if conversion failed or is not possible to begin with
*/
@Nullable
Object convertValue(@Nullable Object value, @Nullable TypeDescriptor sourceType, TypeDescriptor targetType);
}
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