bundles/org.simantics.db.layer0/src/org/simantics/db/layer0/request/VariableRead.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.layer0.request;
  13
  14 import org.simantics.db.AsyncRequestProcessor;
  15 import org.simantics.db.RequestProcessor;
  16 import org.simantics.db.exception.DatabaseException;
  17 import org.simantics.db.layer0.variable.Variable;
  18 import org.simantics.db.procedure.AsyncListener;
  19 import org.simantics.db.procedure.AsyncProcedure;
  20 import org.simantics.db.procedure.Listener;
  21 import org.simantics.db.procedure.Procedure;
  22 import org.simantics.db.procedure.SyncListener;
  23 import org.simantics.db.procedure.SyncProcedure;
  24 import org.simantics.db.request.Read;
  25 import org.simantics.db.request.ReadInterface;
  26
  27 public abstract class VariableRead<T> implements Read<T>, ReadInterface<T> {
  28
  29     final protected Variable variable;
  30
  31     @Override
  32     public int hashCode() {
  33         return variable.hashCode();
  34     }
  35
  36     protected Class<?> clazz() {
  37         return getClass();
  38     }
  39
  40     @Override
  41     public boolean equals(Object object) {
  42         if (this == object)
  43             return true;
  44         else if (object == null)
  45             return false;
  46         else if (!clazz().isInstance(object))
  47             return false;
  48         VariableRead<?> r = (VariableRead<?>) object;
  49         return variable.equals(r.variable);
  50     }
  51
  52     public VariableRead(Variable variable) {
  53         if(variable == null) throw new IllegalArgumentException("Null variable.");
  54         this.variable = variable;
  55     }
  56
  57     @Override
  58     public void request(AsyncRequestProcessor processor, AsyncProcedure<T> procedure) {
  59         processor.asyncRequest(this, procedure);
  60     }
  61
  62     @Override
  63     public void request(AsyncRequestProcessor processor, Procedure<T> procedure) {
  64         processor.asyncRequest(this, procedure);
  65     }
  66
  67     @Override
  68     public void request(AsyncRequestProcessor processor, SyncProcedure<T> procedure) {
  69         processor.asyncRequest(this, procedure);
  70     }
  71
  72     @Override
  73     public void request(AsyncRequestProcessor processor, AsyncListener<T> procedure) {
  74         processor.asyncRequest(this, procedure);
  75     }
  76
  77     @Override
  78     public void request(AsyncRequestProcessor processor, Listener<T> procedure) {
  79         processor.asyncRequest(this, procedure);
  80     }
  81
  82     @Override
  83     public void request(AsyncRequestProcessor processor, SyncListener<T> procedure) {
  84         processor.asyncRequest(this, procedure);
  85     }
  86
  87     @Override
  88     public T request(RequestProcessor processor) throws DatabaseException {
  89         return processor.syncRequest(this);
  90     }
  91
  92     @Override
  93     public String toString() {
  94         return getClass().getSimpleName() + "|" + variable;
  95     }
  96
  97 }