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Java > Open Source Codes > org > springframework > beans > PropertyValues


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  * Holder containing 0 or more PropertyValue objects,
21  * typically comprising one update.
22  *
23  * @author Rod Johnson
24  * @author Juergen Hoeller
25  * @since 13 May 2001
26  * @see PropertyValue
27  */
28 public interface PropertyValues {
29    
30     /**
31      * Return an array of the PropertyValue objects held in this object.
32      */
33     PropertyValue[] getPropertyValues();
34     
35     /**
36      * Return the property value with the given name, if any.
37      * @param propertyName the name to search for
38      * @return the property value, or <code>null</code>
39      */
40     PropertyValue getPropertyValue(String JavaDoc propertyName);
41
42     /**
43      * Is there a property value for this property?
44      * @param propertyName the name of the property we're interested in
45      * @return whether there is a property value for this property
46      */
47     boolean contains(String JavaDoc propertyName);
48
49     /**
50      * Does this holder not contain any PropertyValue objects at all?
51      */
52     boolean isEmpty();
53
54     /**
55      * Return the changes since the previous PropertyValues.
56      * Subclasses should also override <code>equals</code>.
57      * @param old old property values
58      * @return PropertyValues updated or new properties.
59      * Return empty PropertyValues if there are no changes.
60      * @see java.lang.Object#equals
61      */
62     PropertyValues changesSince(PropertyValues old);
63
64 }
65
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