#919 - io.ebean package initial

src/main/java/io/ebean/config/dbplatform/DbDefaultValue.java

@@ -0,0 +1,70 @@
+package io.ebean.config.dbplatform;
+
+import java.util.LinkedHashMap;
+import java.util.Map;
+
+/**
+ * DB Column default values mapping to database platform specific literals.
+ */
+public class DbDefaultValue {
+
+  /**
+   * The key for FALSE.
+   */
+  public static final String FALSE = "false";
+
+  /**
+   * The key for TRUE.
+   */
+  public static final String TRUE = "true";
+
+  /**
+   * The key for the NOW / current timestamp.
+   */
+  public static final String NOW = "now";
+
+  protected Map<String, String> map = new LinkedHashMap<>();
+
+  /**
+   * Set the DB now function.
+   */
+  public void setNow(String dbFunction) {
+    put(NOW, dbFunction);
+  }
+
+  /**
+   * Set the DB false literal.
+   */
+  public void setFalse(String dbFalseLiteral) {
+    put(FALSE, dbFalseLiteral);
+  }
+
+  /**
+   * Set the DB true literal.
+   */
+  public void setTrue(String dbTrueLiteral) {
+    put(TRUE, dbTrueLiteral);
+  }
+
+  /**
+   * Add an translation entry.
+   */
+  public void put(String dbLiteral, String dbTranslated) {
+    map.put(dbLiteral, dbTranslated);
+  }
+
+  /**
+   * Convert the DB default literal to platform specific type or function.
+   * <p>
+   * This is intended for the DB column default clause in DDL.
+   * </p>
+   */
+  public String convert(String dbDefaultLiteral) {
+    if (dbDefaultLiteral == null) {
+      return null;
+    }
+    String val = map.get(dbDefaultLiteral);
+    return val != null ? val : dbDefaultLiteral;
+  }
+
+}