spring PropertyValues 源码
spring PropertyValues 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/PropertyValues.java
/*
* Copyright 2002-2018 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.util.Arrays;
import java.util.Iterator;
import java.util.Spliterator;
import java.util.Spliterators;
import java.util.stream.Stream;
import java.util.stream.StreamSupport;
import org.springframework.lang.Nullable;
/**
* Holder containing one or more {@link PropertyValue} objects,
* typically comprising one update for a specific target bean.
*
* @author Rod Johnson
* @author Juergen Hoeller
* @since 13 May 2001
* @see PropertyValue
*/
public interface PropertyValues extends Iterable<PropertyValue> {
/**
* Return an {@link Iterator} over the property values.
* @since 5.1
*/
@Override
default Iterator<PropertyValue> iterator() {
return Arrays.asList(getPropertyValues()).iterator();
}
/**
* Return a {@link Spliterator} over the property values.
* @since 5.1
*/
@Override
default Spliterator<PropertyValue> spliterator() {
return Spliterators.spliterator(getPropertyValues(), 0);
}
/**
* Return a sequential {@link Stream} containing the property values.
* @since 5.1
*/
default Stream<PropertyValue> stream() {
return StreamSupport.stream(spliterator(), false);
}
/**
* Return an array of the PropertyValue objects held in this object.
*/
PropertyValue[] getPropertyValues();
/**
* Return the property value with the given name, if any.
* @param propertyName the name to search for
* @return the property value, or {@code null} if none
*/
@Nullable
PropertyValue getPropertyValue(String propertyName);
/**
* Return the changes since the previous PropertyValues.
* Subclasses should also override {@code equals}.
* @param old the old property values
* @return the updated or new properties.
* Return empty PropertyValues if there are no changes.
* @see Object#equals
*/
PropertyValues changesSince(PropertyValues old);
/**
* Is there a property value (or other processing entry) for this property?
* @param propertyName the name of the property we're interested in
* @return whether there is a property value for this property
*/
boolean contains(String propertyName);
/**
* Does this holder not contain any PropertyValue objects at all?
*/
boolean isEmpty();
}
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