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

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