01: /*
02: * Copyright 2002-2006 the original author or authors.
03: *
04: * Licensed under the Apache License, Version 2.0 (the "License");
05: * you may not use this file except in compliance with the License.
06: * You may obtain a copy of the License at
07: *
08: * http://www.apache.org/licenses/LICENSE-2.0
09: *
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 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 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: }
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