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.schema.rules; 016 017import org.apache.hivemind.HiveMind; 018import org.apache.hivemind.Location; 019import org.apache.hivemind.internal.Module; 020import org.apache.hivemind.schema.Translator; 021 022/** 023 * Used to translate a value into a reference to a HiveMind service within the registry. 024 * 025 * @author Howard Lewis Ship 026 */ 027public class ServiceTranslator implements Translator 028{ 029 /** 030 * Returns null if the input is null or empty. Returns the service with the given name 031 * otherwise. Will log an error and return null if an exception is thrown. If the input value is 032 * not qualified, the contributing module's id is added as a prefix. 033 */ 034 public Object translate(Module contributingModule, Class propertyType, String inputValue, 035 Location location) 036 { 037 if (HiveMind.isBlank(inputValue)) 038 return null; 039 040 return contributingModule.getService(inputValue, Object.class); 041 } 042 043}