1 /*
2 * Copyright 2001-2013 Stephen Colebourne
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 package org.joda.beans;
17
18 /**
19 * A query based on beans.
20 * <p>
21 * The query interface provides the simplest way to query beans.
22 *
23 * @param <P> the type of the property content
24 * @author Stephen Colebourne
25 */
26 public interface BeanQuery<P> {
27
28 /**
29 * Queries a value from the specified bean.
30 * <p>
31 * This returns a value of some kind derived from the specified bean.
32 * This might be a property value or some other derived value.
33 *
34 * @param bean the bean to query, not null
35 * @return the value derived from the specified bean, may be null
36 * @throws ClassCastException if the bean is of an incorrect type
37 * @throws UnsupportedOperationException if unable to query
38 */
39 P get(Bean bean);
40
41 }