001/* 002 * Copyright 2012-2018 the original author or authors. 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 */ 016 017package org.springframework.boot.context.properties.bind; 018 019import org.springframework.core.env.PropertyResolver; 020 021/** 022 * Optional strategy that used by a {@link Binder} to resolve property placeholders. 023 * 024 * @author Phillip Webb 025 * @author Madhura Bhave 026 * @since 2.0.0 027 * @see PropertySourcesPlaceholdersResolver 028 */ 029@FunctionalInterface 030public interface PlaceholdersResolver { 031 032 /** 033 * No-op {@link PropertyResolver}. 034 */ 035 PlaceholdersResolver NONE = (value) -> value; 036 037 /** 038 * Called to resolve any placeholders in the given value. 039 * @param value the source value 040 * @return a value with placeholders resolved 041 */ 042 Object resolvePlaceholders(Object value); 043 044}