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cn.hutool.setting.SettingLoader Maven / Gradle / Ivy
package cn.hutool.setting;
import cn.hutool.core.io.FileUtil;
import cn.hutool.core.io.IoUtil;
import cn.hutool.core.io.resource.Resource;
import cn.hutool.core.lang.Assert;
import cn.hutool.core.util.CharUtil;
import cn.hutool.core.util.CharsetUtil;
import cn.hutool.core.util.ReUtil;
import cn.hutool.core.util.StrUtil;
import cn.hutool.core.util.SystemPropsUtil;
import cn.hutool.log.Log;
import java.io.BufferedReader;
import java.io.File;
import java.io.IOException;
import java.io.InputStream;
import java.io.PrintWriter;
import java.nio.charset.Charset;
import java.util.HashSet;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map.Entry;
import java.util.Set;
/**
* Setting文件加载器
*
* @author Looly
*
*/
public class SettingLoader {
private static final Log log = Log.get();
/** 注释符号(当有此符号在行首,表示此行为注释) */
private final static char COMMENT_FLAG_PRE = '#';
/** 赋值分隔符(用于分隔键值对) */
private char assignFlag = '=';
/** 变量名称的正则 */
private String varRegex = "\\$\\{(.*?)\\}";
/** 本设置对象的字符集 */
private final Charset charset;
/** 是否使用变量 */
private final boolean isUseVariable;
/** GroupedMap */
private final GroupedMap groupedMap;
/**
* 构造
*
* @param groupedMap GroupedMap
*/
public SettingLoader(GroupedMap groupedMap) {
this(groupedMap, CharsetUtil.CHARSET_UTF_8, false);
}
/**
* 构造
*
* @param groupedMap GroupedMap
* @param charset 编码
* @param isUseVariable 是否使用变量
*/
public SettingLoader(GroupedMap groupedMap, Charset charset, boolean isUseVariable) {
this.groupedMap = groupedMap;
this.charset = charset;
this.isUseVariable = isUseVariable;
}
/**
* 加载设置文件
*
* @param resource 配置文件URL
* @return 加载是否成功
*/
public boolean load(Resource resource) {
if (resource == null) {
throw new NullPointerException("Null setting url define!");
}
log.debug("Load setting file [{}]", resource);
InputStream settingStream = null;
try {
settingStream = resource.getStream();
load(settingStream);
} catch (Exception e) {
log.error(e, "Load setting error!");
return false;
} finally {
IoUtil.close(settingStream);
}
return true;
}
/**
* 加载设置文件。 此方法不会关闭流对象
*
* @param settingStream 文件流
* @return 加载成功与否
* @throws IOException IO异常
*/
synchronized public boolean load(InputStream settingStream) throws IOException {
this.groupedMap.clear();
BufferedReader reader = null;
try {
reader = IoUtil.getReader(settingStream, this.charset);
// 分组
String group = null;
String line;
while (true) {
line = reader.readLine();
if (line == null) {
break;
}
line = line.trim();
// 跳过注释行和空行
if (StrUtil.isBlank(line) || StrUtil.startWith(line, COMMENT_FLAG_PRE)) {
continue;
}
// 记录分组名
if (StrUtil.isSurround(line, CharUtil.BRACKET_START, CharUtil.BRACKET_END)) {
group = line.substring(1, line.length() - 1).trim();
continue;
}
final String[] keyValue = StrUtil.splitToArray(line, this.assignFlag, 2);
// 跳过不符合键值规范的行
if (keyValue.length < 2) {
continue;
}
String value = keyValue[1].trim();
// 替换值中的所有变量变量(变量必须是此行之前定义的变量,否则无法找到)
if (this.isUseVariable) {
value = replaceVar(group, value);
}
this.groupedMap.put(group, keyValue[0].trim(), value);
}
} finally {
IoUtil.close(reader);
}
return true;
}
/**
* 设置变量的正则
* 正则只能有一个group表示变量本身,剩余为字符 例如 \$\{(name)\}表示${name}变量名为name的一个变量表示
*
* @param regex 正则
*/
public void setVarRegex(String regex) {
this.varRegex = regex;
}
/**
* 赋值分隔符(用于分隔键值对)
*
* @param assignFlag 正则
* @since 4.6.5
*/
public void setAssignFlag(char assignFlag) {
this.assignFlag = assignFlag;
}
/**
* 持久化当前设置,会覆盖掉之前的设置
* 持久化会不会保留之前的分组
*
* @param absolutePath 设置文件的绝对路径
*/
public void store(String absolutePath) {
store(FileUtil.touch(absolutePath));
}
/**
* 持久化当前设置,会覆盖掉之前的设置
* 持久化会不会保留之前的分组
*
* @param file 设置文件
* @since 5.4.3
*/
public void store(File file) {
Assert.notNull(file, "File to store must be not null !");
log.debug("Store Setting to [{}]...", file.getAbsolutePath());
PrintWriter writer = null;
try {
writer = FileUtil.getPrintWriter(file, charset, false);
store(writer);
} finally {
IoUtil.close(writer);
}
}
/**
* 存储到Writer
*
* @param writer Writer
*/
synchronized private void store(PrintWriter writer) {
for (Entry> groupEntry : this.groupedMap.entrySet()) {
writer.println(StrUtil.format("{}{}{}", CharUtil.BRACKET_START, groupEntry.getKey(), CharUtil.BRACKET_END));
for (Entry entry : groupEntry.getValue().entrySet()) {
writer.println(StrUtil.format("{} {} {}", entry.getKey(), this.assignFlag, entry.getValue()));
}
}
}
// ----------------------------------------------------------------------------------- Private method start
/**
* 替换给定值中的变量标识
*
* @param group 所在分组
* @param value 值
* @return 替换后的字符串
*/
private String replaceVar(String group, String value) {
// 找到所有变量标识
final Set vars = ReUtil.findAll(varRegex, value, 0, new HashSet<>());
String key;
for (String var : vars) {
key = ReUtil.get(varRegex, var, 1);
if (StrUtil.isNotBlank(key)) {
// 本分组中查找变量名对应的值
String varValue = this.groupedMap.get(group, key);
// 跨分组查找
if (null == varValue) {
final List groupAndKey = StrUtil.split(key, CharUtil.DOT, 2);
if (groupAndKey.size() > 1) {
varValue = this.groupedMap.get(groupAndKey.get(0), groupAndKey.get(1));
}
}
// 系统参数和环境变量中查找
if (null == varValue) {
varValue = SystemPropsUtil.get(key);
}
if (null != varValue) {
// 替换标识
value = value.replace(var, varValue);
}
}
}
return value;
}
// ----------------------------------------------------------------------------------- Private method end
}