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; 016 017/** 018 * Used to define an object that can provide a value for a substitution symbol 019 * (substitution symbol can appear in HiveMind module deployment descriptors). 020 * 021 * @author Howard Lewis Ship 022 */ 023 024public interface SymbolSource 025{ 026 /** 027 * Returns the value for the symbol, if this source can provide one. 028 * Returns null if the source can not provide a value. 029 */ 030 public String valueForSymbol(String name); 031}