001// Copyright 2004, 2005 The Apache Software Foundation 002// 003// Licensed under the Apache License, Version 2.0 (the "License"); 004// you may not use this file except in compliance with the License. 005// You may obtain a copy of the License at 006// 007// http://www.apache.org/licenses/LICENSE-2.0 008// 009// Unless required by applicable law or agreed to in writing, software 010// distributed under the License is distributed on an "AS IS" BASIS, 011// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 012// See the License for the specific language governing permissions and 013// limitations under the License. 014 015package org.apache.hivemind.lib; 016 017 018/** 019 * Builds a default implementation of an interface. The fabricated class has no-op 020 * implementions for each method in the interface. Non-void methods return null, 021 * false or zero. A cached, shared instance of the empty implementation is kept and will 022 * be returned on future invocations. 023 * 024 * @author Howard Lewis Ship 025 */ 026public interface DefaultImplementationBuilder 027{ 028 /** 029 * Builds a default implementation of the indicated interface, instantiates and returns it. 030 * Results are cached for later re-use. 031 * 032 * @throws org.apache.hivemind.ApplicationRuntimeException if interfaceType is not an interface. 033 */ 034 public Object buildDefaultImplementation(Class interfaceType); 035}