add postgresql database

database/src/main/java/org/inksnow/cputil/db/postgres/PostgresqlDatabase.java

@@ -0,0 +1,62 @@
+package org.inksnow.cputil.db.postgres;
+
+import org.inksnow.cputil.classloader.LoadPolicy;
+import org.inksnow.cputil.db.Database;
+import org.inksnow.cputil.db.transform.DisableRegisterDriverTransformer;
+import org.inksnow.cputil.download.DownloadEntry;
+import org.inksnow.cputil.transform.Transformer;
+
+import java.util.Collections;
+import java.util.HashMap;
+import java.util.List;
+import java.util.Map;
+
+public class PostgresqlDatabase implements Database {
+  private static final String DRIVER_CLASS_NAME = "com.mysql.cj.jdbc.Driver";
+  private static final Map<String, LoadPolicy> LOAD_POLICIES = createLoadPolicies();
+  private static final Map<String, List<Transformer>> TRANSFORMERS = createTransformers();
+  private static final List<DownloadEntry> DOWNLOAD_ENTRIES = Collections.singletonList(
+      new DownloadEntry(
+          "org/postgresql/postgresql/42.7.4/postgresql-42.7.4.jar",
+          "https://repo1.maven.org/maven2/org/postgresql/postgresql/42.7.4/postgresql-42.7.4.jar",
+          "188976721ead8e8627eb6d8389d500dccc0c9bebd885268a3047180274a6031e"
+      )
+  );
+
+  private static Map<String, LoadPolicy> createLoadPolicies() {
+    Map<String, LoadPolicy> loadPolicies = new HashMap<>();
+    loadPolicies.put("org/postgresql", LoadPolicy.SELF_ONLY);
+    return Collections.unmodifiableMap(loadPolicies);
+  }
+
+  private static Map<String, List<Transformer>> createTransformers() {
+    Map<String, List<Transformer>> transformers = new HashMap<>();
+    transformers.put("org/postgresql/Driver", Collections.singletonList(new DisableRegisterDriverTransformer()));
+    return Collections.unmodifiableMap(transformers);
+  }
+
+  @Override
+  public String name() {
+    return "postgresql";
+  }
+
+  @Override
+  public List<DownloadEntry> downloadEntries() {
+    return DOWNLOAD_ENTRIES;
+  }
+
+  @Override
+  public Map<String, LoadPolicy> loadPolicies() {
+    return LOAD_POLICIES;
+  }
+
+  @Override
+  public Map<String, List<Transformer>> transformers() {
+    return TRANSFORMERS;
+  }
+
+  @Override
+  public String driverClassName() {
+    return DRIVER_CLASS_NAME;
+  }
+}

database/src/main/resources/META-INF/services/org.inksnow.cputil.db.Database

@@ -4,3 +4,4 @@ org.inksnow.cputil.db.h2.H2v2Database
 
 org.inksnow.cputil.db.mysql.MysqlDatabase
 org.inksnow.cputil.db.mariadb.MariadbDatabase
+org.inksnow.cputil.db.postgres.PostgresqlDatabase