Mergeable


1   /*
2    * Copyright 2002-2006 the original author or authors.
3    *
4    * Licensed under the Apache License, Version 2.0 (the "License");
5    * you may not use this file except in compliance with the License.
6    * You may obtain a copy of the License at
7    *
8    *      http://www.apache.org/licenses/LICENSE-2.0
9    *
10   * Unless required by applicable law or agreed to in writing, software
11   * distributed under the License is distributed on an "AS IS" BASIS,
12   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
13   * See the License for the specific language governing permissions and
14   * limitations under the License.
15   */
16  
17  package org.springframework.beans;
18  
19  /**
20   * Interface representing an object whose value set can be merged with
21   * that of a parent object.
22   *
23   * @author Rob Harrop
24   * @since 2.0
25   * @see org.springframework.beans.factory.support.ManagedSet
26   * @see org.springframework.beans.factory.support.ManagedList
27   * @see org.springframework.beans.factory.support.ManagedMap
28   * @see org.springframework.beans.factory.support.ManagedProperties
29   */
30  public interface Mergeable {
31  
32      /**
33       * Is merging enabled for this particular instance?
34       */
35      boolean isMergeEnabled();
36  
37      /**
38       * Merge the current value set with that of the supplied object.
39       * <p>The supplied object is considered the parent, and values in
40       * the callee's value set must override those of the supplied object.
41       * @param parent the object to merge with
42       * @return the result of the merge operation
43       * @throws IllegalArgumentException if the supplied parent is <code>null</code>
44       * @exception IllegalStateException if merging is not enabled for this instance
45       * (i.e. <code>mergeEnabled</code> equals <code>false</code>).
46       */
47      Object   merge(Object   parent);
48  
49  }
50
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