Add PreparedPlugin interface

misc/src/main/java/org/zhdev/varioutil/PreparedPlugin.java

@@ -0,0 +1,62 @@
+package org.zhdev.varioutil;
+
+import org.zhdev.varioutil.config.Config;
+import org.zhdev.varioutil.config.ConfigException;
+import org.zhdev.varioutil.language.Language;
+import org.zhdev.varioutil.sql.SqlAdapter;
+import org.zhdev.varioutil.util.ResourceUtils;
+
+import java.io.IOException;
+import java.io.InputStream;
+import java.nio.file.Files;
+import java.nio.file.Path;
+
+public interface PreparedPlugin {
+    Config getDefaultConfig();
+
+    Language getLanguage();
+
+    SqlAdapter getSqlAdapter();
+
+    Path getDataDirectory();
+
+    default Path loadConfig(Config config, String pathname) {
+        ClassLoader classLoader = getClass().getClassLoader();
+        InputStream stream = ResourceUtils.getResource(pathname, classLoader);
+        if (stream != null) {
+            config.load(stream);
+        }
+
+        Path path = config.load(getDataDirectory().toString() + '/' + pathname);
+        try {
+            if (Files.notExists(path) || Files.size(path) == 0) {
+                if (ResourceUtils.saveResource(pathname, path, classLoader)) {
+                    config.load(path);
+                }
+            }
+        } catch (IOException e) {
+            throw new ConfigException(e);
+        }
+        return path;
+    }
+
+    default Path loadConfig(Config config) {
+        return loadConfig(config, config.getKey());
+    }
+
+    default Path saveConfig(Config config, String pathname) {
+        return config.save(getDataDirectory().toString() + '/' + pathname);
+    }
+
+    default Path saveConfigIfEmpty(Config config, String pathname) {
+        return config.saveIfEmpty(getDataDirectory().toString() + '/' + pathname);
+    }
+
+    default Path saveConfig(Config config) {
+        return saveConfig(config, config.getKey());
+    }
+
+    default Path saveConfigIfEmpty(Config config) {
+        return saveConfigIfEmpty(config, config.getKey());
+    }
+}