merged 1.1 branch into head

[mir.git] / source / mir / entity / adapter / ToOneRelationField.java

diff --git a/source/mir/entity/adapter/ToOneRelationField.java b/source/mir/entity/adapter/ToOneRelationField.java
new file mode 100755 (executable)
index 0000000..92dce0f
--- /dev/null
+++ b/source/mir/entity/adapter/ToOneRelationField.java
@@ -0,0 +1,55 @@
+/*\r
+ * Copyright (C) 2005 The Mir-coders group\r
+ *\r
+ * This file is part of Mir.\r
+ *\r
+ * Mir is free software; you can redistribute it and/or modify\r
+ * it under the terms of the GNU General Public License as published by\r
+ * the Free Software Foundation; either version 2 of the License, or\r
+ * (at your option) any later version.\r
+ *\r
+ * Mir is distributed in the hope that it will be useful,\r
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of\r
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the\r
+ * GNU General Public License for more details.\r
+ *\r
+ * You should have received a copy of the GNU General Public License\r
+ * along with Mir; if not, write to the Free Software\r
+ * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA\r
+ *\r
+ * In addition, as a special exception, The Mir-coders gives permission to link\r
+ * the code of this program with  any library licensed under the Apache Software License.\r
+ * You must obey the GNU General Public License in all respects for all of the code used\r
+ * other than the above mentioned libraries.  If you modify this file, you may extend this\r
+ * exception to your version of the file, but you are not obligated to do so.\r
+ * If you do not wish to do so, delete this exception statement from your version.\r
+ */\r
+package mir.entity.adapter;\r
+\r
+public class ToOneRelationField implements EntityAdapterDefinition.CalculatedField{\r
+  private String fromField;\r
+  private String toField;\r
+  private String toEntity;\r
+\r
+  public ToOneRelationField(String aFromField, String aToEntity, String aToField) {\r
+    fromField = aFromField;\r
+    toField = aToField;\r
+    toEntity = aToEntity;\r
+  }\r
+\r
+  public Object getValue(EntityAdapter anEntityAdapter) {\r
+    try {\r
+      if (anEntityAdapter.get(fromField)==null) {\r
+        return null;\r
+      }\r
+      \r
+      return anEntityAdapter.getToOneRelation(\r
+                  toField + "=" + anEntityAdapter.get(fromField),\r
+                  toField,\r
+                  toEntity);\r
+    }\r
+    catch (Throwable t) {\r
+      throw new RuntimeException(t.getMessage());\r
+    }\r
+  }\r
+}\r