spring CompositeComponentDefinition 源码
spring CompositeComponentDefinition 代码
文件路径：/spring-beans/src/main/java/org/springframework/beans/factory/parsing/CompositeComponentDefinition.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.factory.parsing;
import java.util.ArrayList;
import java.util.List;
import org.springframework.lang.Nullable;
import org.springframework.util.Assert;
/**
* {@link ComponentDefinition} implementation that holds one or more nested
* {@link ComponentDefinition} instances, aggregating them into a named group
* of components.
*
* @author Juergen Hoeller
* @since 2.0.1
* @see #getNestedComponents()
*/
public class CompositeComponentDefinition extends AbstractComponentDefinition {
private final String name;
@Nullable
private final Object source;
private final List<ComponentDefinition> nestedComponents = new ArrayList<>();
/**
* Create a new CompositeComponentDefinition.
* @param name the name of the composite component
* @param source the source element that defines the root of the composite component
*/
public CompositeComponentDefinition(String name, @Nullable Object source) {
Assert.notNull(name, "Name must not be null");
this.name = name;
this.source = source;
}
@Override
public String getName() {
return this.name;
}
@Override
@Nullable
public Object getSource() {
return this.source;
}
/**
* Add the given component as nested element of this composite component.
* @param component the nested component to add
*/
public void addNestedComponent(ComponentDefinition component) {
Assert.notNull(component, "ComponentDefinition must not be null");
this.nestedComponents.add(component);
}
/**
* Return the nested components that this composite component holds.
* @return the array of nested components, or an empty array if none
*/
public ComponentDefinition[] getNestedComponents() {
return this.nestedComponents.toArray(new ComponentDefinition[0]);
}
}
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