org.simantics.interop/src/org/simantics/interop/issues/AndRead.java

   1 package org.simantics.interop.issues;\r
   2 \r
   3 import org.simantics.db.ReadGraph;\r
   4 import org.simantics.db.exception.DatabaseException;\r
   5 import org.simantics.db.request.Read;\r
   6 \r
   7 /**\r
   8  * AndRead can be used to combine multiple requests into single one. If all reads return true or null, this returns true.\r
   9  * @author Marko Luukkainen <marko.luukkainen@vtt.fi>\r
  10  *\r
  11  */\r
  12 public class AndRead implements Read<Boolean>{\r
  13 \r
  14         private Read<Boolean> reads[];\r
  15         \r
  16         public AndRead(Read<Boolean>... reads) {\r
  17                 this.reads = reads;\r
  18         }\r
  19         \r
  20         @Override\r
  21         public Boolean perform(ReadGraph graph) throws DatabaseException {\r
  22                 Boolean b = null;\r
  23                 for (Read<Boolean> r : reads) {\r
  24                         b = r.perform(graph);\r
  25                         if(b != null && !b)\r
  26                                 return false;\r
  27                 }\r
  28                 return true;\r
  29         }\r
  30 }\r