001/* 002 * Copyright 2002-2017 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 * https://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.context.support; 018 019import org.springframework.context.EmbeddedValueResolverAware; 020import org.springframework.lang.Nullable; 021import org.springframework.util.StringValueResolver; 022 023/** 024 * Convenient base class for components with a need for embedded value resolution 025 * (i.e. {@link org.springframework.context.EmbeddedValueResolverAware} consumers). 026 * 027 * @author Juergen Hoeller 028 * @since 4.1 029 */ 030public class EmbeddedValueResolutionSupport implements EmbeddedValueResolverAware { 031 032 @Nullable 033 private StringValueResolver embeddedValueResolver; 034 035 036 @Override 037 public void setEmbeddedValueResolver(StringValueResolver resolver) { 038 this.embeddedValueResolver = resolver; 039 } 040 041 /** 042 * Resolve the given embedded value through this instance's {@link StringValueResolver}. 043 * @param value the value to resolve 044 * @return the resolved value, or always the original value if no resolver is available 045 * @see #setEmbeddedValueResolver 046 */ 047 @Nullable 048 protected String resolveEmbeddedValue(String value) { 049 return (this.embeddedValueResolver != null ? this.embeddedValueResolver.resolveStringValue(value) : value); 050 } 051 052 053}