com.janetfilter.core.commons.ConfigParser Maven / Gradle / Ivy
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package com.janetfilter.core.commons;
import com.janetfilter.core.models.FilterRule;
import com.janetfilter.core.utils.StringUtils;
import java.io.BufferedReader;
import java.io.File;
import java.io.FileInputStream;
import java.io.InputStreamReader;
import java.nio.charset.StandardCharsets;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
public class ConfigParser {
public static Map> parse(File file) throws Exception {
Map> map = new HashMap<>();
if (null == file || !file.exists() || !file.isFile() || !file.canRead()) {
return map;
}
try (BufferedReader reader = new BufferedReader(new InputStreamReader(new FileInputStream(file), StandardCharsets.UTF_8))) {
int lineNumber = 0;
String line, lastSection = null;
while (null != (line = reader.readLine())) {
lineNumber++;
line = line.trim();
if (StringUtils.isEmpty(line)) {
continue;
}
int len = line.length();
switch (line.charAt(0)) {
case '[':
if (']' != line.charAt(len - 1)) {
throw new Exception("Invalid section! Line: " + lineNumber);
}
String section = line.substring(1, len - 1);
if (StringUtils.isEmpty(section)) {
throw new Exception("Empty section name! Line: " + lineNumber);
}
map.computeIfAbsent(lastSection = section, k -> new ArrayList<>());
break;
case '#':
case ';':
break; // comment
case '/':
if (len > 1 && '/' == line.charAt(1)) {
break; // comment
}
throw new Exception("Invalid character! Line: " + lineNumber);
default:
if (null == lastSection) {
break; // ignore rules without section
}
String[] parts = line.split(",", 2);
if (2 != parts.length) {
throw new Exception("Invalid rule! Line: " + lineNumber);
}
String type = parts[0].trim();
String content = parts[1].trim();
if (StringUtils.isEmpty(type) || StringUtils.isEmpty(content)) {
throw new Exception("Invalid rule! Line: " + lineNumber);
}
if (!Character.isAlphabetic(type.charAt(0))) {
throw new Exception("Invalid rule! Line: " + lineNumber);
}
FilterRule rule = FilterRule.of(type, content);
if (null == rule) {
throw new Exception("Invalid rule type! Line: " + lineNumber);
}
map.get(lastSection).add(rule);
DebugInfo.debug("Add section: " + lastSection + ", rule: " + rule);
break;
}
}
}
DebugInfo.debug("Config file loaded: " + file);
return map;
}
}