bundles/org.simantics.db.common/src/org/simantics/db/common/request/UnaryParametrizedRead.java

   1 /*******************************************************************************\r
   2  * Copyright (c) 2007, 2010 Association for Decentralized Information Management\r
   3  * in Industry THTH ry.\r
   4  * All rights reserved. This program and the accompanying materials\r
   5  * are made available under the terms of the Eclipse Public License v1.0\r
   6  * which accompanies this distribution, and is available at\r
   7  * http://www.eclipse.org/legal/epl-v10.html\r
   8  *\r
   9  * Contributors:\r
  10  *     VTT Technical Research Centre of Finland - initial API and implementation\r
  11  *******************************************************************************/\r
  12 package org.simantics.db.common.request;\r
  13 \r
  14 import org.simantics.db.ReadGraph;\r
  15 import org.simantics.db.exception.DatabaseException;\r
  16 import org.simantics.db.request.Read;\r
  17 \r
  18 public abstract class UnaryParametrizedRead<P, C, R> implements ParametrizedRead<P, R> {\r
  19 \r
  20     final protected C constant;\r
  21     \r
  22     public UnaryParametrizedRead(C constant) {\r
  23         this.constant = constant;\r
  24     }\r
  25         \r
  26         abstract public R perform(ReadGraph graph, P parameter) throws DatabaseException;\r
  27         \r
  28         @Override\r
  29         public Read<R> get(P parameter) {\r
  30                 return new BinaryRead<P, C, R>(parameter, constant) {\r
  31 \r
  32                         @Override\r
  33                         public R perform(ReadGraph graph) throws DatabaseException {\r
  34                                 return UnaryParametrizedRead.this.perform(graph, parameter);\r
  35                         }\r
  36                         \r
  37                 };\r
  38         }\r
  39     \r
  40 }\r