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Java > Open Source Codes > org > objectweb > medor > eval > lib > TupleCollectionNodeEvaluator


1 /**
2  * MEDOR: Middleware Enabling Distributed Object Requests
3  *
4  * Copyright (C) 2001-2004 France Telecom R&D
5  * Contact: alexandre.lefebvre@rd.francetelecom.com
6  *
7  * This library is free software; you can redistribute it and/or
8  * modify it under the terms of the GNU Lesser General Public
9  * License as published by the Free Software Foundation; either
10  * version 2.1 of the License, or (at your option) any later version.
11  *
12  * This library is distributed in the hope that it will be useful,
13  * but WITHOUT ANY WARRANTY; without even the implied warranty of
14  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15  * Lesser General Public License for more details.
16  *
17  * You should have received a copy of the GNU Lesser General Public
18  * License along with this library; if not, write to the Free Software
19  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
20  *
21  * Initial developers: M. Alia, A. Lefebvre
22  */
23 package org.objectweb.medor.eval.lib;
24
25 import org.objectweb.medor.eval.api.NodeEvaluator;
26 import org.objectweb.medor.eval.api.EvaluationMetaData;
27 import org.objectweb.medor.eval.prefetch.api.PrefetchBuffer;
28 import org.objectweb.medor.tuple.api.TupleCollection;
29 import org.objectweb.medor.expression.api.ParameterOperand;
30 import org.objectweb.medor.query.api.QueryNode;
31 import org.objectweb.medor.api.MedorException;
32
33 /**
34  * Just a simple class that encapsulates a TupleCollection.
35  */
36 public class TupleCollectionNodeEvaluator implements NodeEvaluator {
37
38     TupleCollection tc;
39     QueryNode qn;
40     long cacheSize = 0;
41
42     public TupleCollectionNodeEvaluator(TupleCollection tc) {
43         this.tc = tc;
44     }
45
46     public boolean linkChildren(){
47         return true;
48     }
49
50     public boolean unlinkChildren(){
51         return true;
52     }
53
54     public TupleCollection fetchData(ParameterOperand[] parameters){
55         return tc;
56     }
57
58     public QueryNode getQueryNode(){
59         return qn;
60     }
61
62     public long getCacheSize() {
63         return cacheSize;
64     }
65
66     public void setCacheSize(long cacheSize) {
67         this.cacheSize = cacheSize;
68     }
69
70     public void setPrefetchBuffer(PrefetchBuffer pb) throws MedorException {
71         // No prefetching for this evaluator: ignore
72 }
73
74     public EvaluationMetaData getEvaluationMetaData() {
75         return null;
76     }
77
78 }
79
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