spring SimpleKey 源码
spring SimpleKey 代码
文件路径：/spring-context/src/main/java/org/springframework/cache/interceptor/SimpleKey.java
/*
* Copyright 2002-2020 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.cache.interceptor;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.Serializable;
import java.util.Arrays;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
import org.springframework.util.StringUtils;
/**
* A simple key as returned from the {@link SimpleKeyGenerator}.
*
* @author Phillip Webb
* @author Juergen Hoeller
* @since 4.0
* @see SimpleKeyGenerator
*/
@SuppressWarnings("serial")
public class SimpleKey implements Serializable {
/**
* An empty key.
*/
public static final SimpleKey EMPTY = new SimpleKey();
private final Object[] params;
// Effectively final, just re-calculated on deserialization
private transient int hashCode;
/**
* Create a new {@link SimpleKey} instance.
* @param elements the elements of the key
*/
public SimpleKey(Object... elements) {
Assert.notNull(elements, "Elements must not be null");
this.params = elements.clone();
// Pre-calculate hashCode field
this.hashCode = Arrays.deepHashCode(this.params);
}
@Override
public boolean equals(@Nullable Object other) {
return (this == other ||
(other instanceof SimpleKey && Arrays.deepEquals(this.params, ((SimpleKey) other).params)));
}
@Override
public final int hashCode() {
// Expose pre-calculated hashCode field
return this.hashCode;
}
@Override
public String toString() {
return getClass().getSimpleName() + " [" + StringUtils.arrayToCommaDelimitedString(this.params) + "]";
}
private void readObject(ObjectInputStream ois) throws IOException, ClassNotFoundException {
ois.defaultReadObject();
// Re-calculate hashCode field on deserialization
this.hashCode = Arrays.deepHashCode(this.params);
}
}
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