001/* 002 * Licensed to the Apache Software Foundation (ASF) under one 003 * or more contributor license agreements. See the NOTICE file 004 * distributed with this work for additional information 005 * regarding copyright ownership. The ASF licenses this file 006 * to you under the Apache License, Version 2.0 (the 007 * "License"); you may not use this file except in compliance 008 * with the License. You may obtain a copy of the License at 009 * 010 * http://www.apache.org/licenses/LICENSE-2.0 011 * 012 * Unless required by applicable law or agreed to in writing, 013 * software distributed under the License is distributed on an 014 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY 015 * KIND, either express or implied. See the License for the 016 * specific language governing permissions and limitations 017 * under the License. 018 */ 019package org.apache.reef.tang; 020 021/** 022 * This interface is used to track the source of configuration bindings. 023 * <p> 024 * This can be explicitly set (such as by configuration file parsers), or be 025 * implicitly bound to the stack trace of bind() invocation. 026 */ 027public interface BindLocation { 028 /** 029 * Implementations of BindLocation should override toString() so that it 030 * returns a human readable representation of the source of the 031 * configuration option in question. 032 * 033 * @return A (potentially multi-line) string that represents the stack 034 * trace, configuration file location, or other source of some 035 * configuration data. 036 */ 037 String toString(); 038}