com.alibaba.nacos.spring.util.PropertiesPlaceholderResolver Maven / Gradle / Ivy

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/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package com.alibaba.nacos.spring.util;

import java.lang.annotation.Annotation;
import java.util.Map;
import java.util.Properties;

import org.springframework.core.annotation.AnnotationUtils;
import org.springframework.core.env.PropertyResolver;
import org.springframework.util.StringUtils;

/**
 * Placeholder Resolver for {@link Properties properties}
 *
 * @author Mercy
 * @since 0.1.0
 */
public class PropertiesPlaceholderResolver {

	private final PropertyResolver propertyResolver;

	public PropertiesPlaceholderResolver(PropertyResolver propertyResolver) {
		this.propertyResolver = propertyResolver;
	}

	/**
	 * Resolve placeholders in specified {@link Annotation annotation}
	 *
	 * @param annotation {@link Annotation annotation}
	 * @return Resolved {@link Properties source properties}
	 */
	public Properties resolve(Annotation annotation) {
		Map attributes = AnnotationUtils
				.getAnnotationAttributes(annotation);
		return resolve(attributes);
	}

	/**
	 * Resolve placeholders in specified {@link Map properties}
	 *
	 * @param properties {@link Map source properties}
	 * @return Resolved {@link Properties source properties}
	 */
	public Properties resolve(Map properties) {
		Properties resolvedProperties = new Properties();
		for (Map.Entry entry : properties.entrySet()) {
			if (entry.getValue() instanceof CharSequence) {
				String key = String.valueOf(entry.getKey());
				String value = String.valueOf(entry.getValue());
				String resolvedValue = propertyResolver.resolvePlaceholders(value);
				if (StringUtils.hasText(resolvedValue)) { // set properties if has test
					resolvedProperties.setProperty(key, resolvedValue);
				}
			}
		}
		return resolvedProperties;
	}

}