infra.beans.factory.config.EmbeddedValueResolver Maven / Gradle / Ivy
/*
* Copyright 2017 - 2024 the original author or authors.
*
* This program is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program. If not, see [https://www.gnu.org/licenses/]
*/
package infra.beans.factory.config;
import infra.core.StringValueResolver;
import infra.lang.Nullable;
import infra.util.ObjectUtils;
/**
* {@link StringValueResolver} adapter for resolving placeholders and
* expressions against a {@link ConfigurableBeanFactory}.
*
* Note that this adapter resolves expressions as well, in contrast
* to the {@link ConfigurableBeanFactory#resolveEmbeddedValue} method.
* The {@link BeanExpressionContext} used is for the plain bean factory,
* with no scope specified for any contextual objects to access.
*
* @author Juergen Hoeller
* @author Harry Yang
* @see ConfigurableBeanFactory#resolveEmbeddedValue(String)
* @see ConfigurableBeanFactory#getBeanExpressionResolver()
* @see BeanExpressionContext
* @since 4.0 2021/12/7 11:24
*/
public class EmbeddedValueResolver implements StringValueResolver {
private final ExpressionEvaluator expressionEvaluator;
public EmbeddedValueResolver(ConfigurableBeanFactory beanFactory) {
this.expressionEvaluator = ExpressionEvaluator.from(beanFactory);
}
@Override
@Nullable
public String resolveStringValue(@Nullable String strVal) {
return ObjectUtils.toString(expressionEvaluator.evaluate(strVal));
}
/**
* contains placeholder or EL expressions
*
* @param expr expression
*/
public static boolean isEmbedded(@Nullable String expr) {
return expr != null && ((expr.startsWith("#{") || expr.startsWith("${")) && expr.endsWith("}"));
}
}