001/* 002 * Copyright 2002-2012 the original author or authors. 003 * 004 * Licensed under the Apache License, Version 2.0 (the "License"); 005 * you may not use this file except in compliance with the License. 006 * You may obtain a copy of the License at 007 * 008 * https://www.apache.org/licenses/LICENSE-2.0 009 * 010 * Unless required by applicable law or agreed to in writing, software 011 * distributed under the License is distributed on an "AS IS" BASIS, 012 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 013 * See the License for the specific language governing permissions and 014 * limitations under the License. 015 */ 016 017package org.springframework.beans.factory.parsing; 018 019import java.util.LinkedList; 020import java.util.List; 021 022import org.springframework.util.Assert; 023 024/** 025 * {@link ComponentDefinition} implementation that holds one or more nested 026 * {@link ComponentDefinition} instances, aggregating them into a named group 027 * of components. 028 * 029 * @author Juergen Hoeller 030 * @since 2.0.1 031 * @see #getNestedComponents() 032 */ 033public class CompositeComponentDefinition extends AbstractComponentDefinition { 034 035 private final String name; 036 037 private final Object source; 038 039 private final List<ComponentDefinition> nestedComponents = new LinkedList<ComponentDefinition>(); 040 041 042 /** 043 * Create a new CompositeComponentDefinition. 044 * @param name the name of the composite component 045 * @param source the source element that defines the root of the composite component 046 */ 047 public CompositeComponentDefinition(String name, Object source) { 048 Assert.notNull(name, "Name must not be null"); 049 this.name = name; 050 this.source = source; 051 } 052 053 054 @Override 055 public String getName() { 056 return this.name; 057 } 058 059 @Override 060 public Object getSource() { 061 return this.source; 062 } 063 064 065 /** 066 * Add the given component as nested element of this composite component. 067 * @param component the nested component to add 068 */ 069 public void addNestedComponent(ComponentDefinition component) { 070 Assert.notNull(component, "ComponentDefinition must not be null"); 071 this.nestedComponents.add(component); 072 } 073 074 /** 075 * Return the nested components that this composite component holds. 076 * @return the array of nested components, or an empty array if none 077 */ 078 public ComponentDefinition[] getNestedComponents() { 079 return this.nestedComponents.toArray(new ComponentDefinition[this.nestedComponents.size()]); 080 } 081 082}