001/* 002 * Copyright 2001-2013 Stephen Colebourne 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 * http://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 */ 016package org.joda.beans; 017 018/** 019 * A query based on beans. 020 * <p> 021 * The query interface provides the simplest way to query beans. 022 * 023 * @param <P> the type of the property content 024 * @author Stephen Colebourne 025 */ 026public interface BeanQuery<P> { 027 028 /** 029 * Queries a value from the specified bean. 030 * <p> 031 * This returns a value of some kind derived from the specified bean. 032 * This might be a property value or some other derived value. 033 * 034 * @param bean the bean to query, not null 035 * @return the value derived from the specified bean, may be null 036 * @throws ClassCastException if the bean is of an incorrect type 037 * @throws UnsupportedOperationException if unable to query 038 */ 039 P get(Bean bean); 040 041}