spring TypeComparator 源码
spring TypeComparator 代码
文件路径：/spring-expression/src/main/java/org/springframework/expression/TypeComparator.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.lang.Nullable;
/**
* Instances of a type comparator should be able to compare pairs of objects for equality.
* The specification of the return value is the same as for {@link java.lang.Comparable}.
*
* @author Andy Clement
* @since 3.0
* @see java.lang.Comparable
*/
public interface TypeComparator {
/**
* Return {@code true} if the comparator can compare these two objects.
* @param firstObject the first object
* @param secondObject the second object
* @return {@code true} if the comparator can compare these objects
*/
boolean canCompare(@Nullable Object firstObject, @Nullable Object secondObject);
/**
* Compare two given objects.
* @param firstObject the first object
* @param secondObject the second object
* @return 0 if they are equal, a negative integer if the first is smaller than
* the second, or a positive integer if the first is larger than the second
* @throws EvaluationException if a problem occurs during comparison
* (or if they are not comparable in the first place)
* @see Comparable#compareTo
*/
int compare(@Nullable Object firstObject, @Nullable Object secondObject) throws EvaluationException;
}
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