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Java > Open Source Codes > org > apache > derby > impl > sql > compile > Level2CostEstimateImpl


1 /*
2
3    Derby - Class org.apache.derby.impl.sql.compile.Level2CostEstimateImpl
4
5    Licensed to the Apache Software Foundation (ASF) under one or more
6    contributor license agreements. See the NOTICE file distributed with
7    this work for additional information regarding copyright ownership.
8    The ASF licenses this file to you under the Apache License, Version 2.0
9    (the "License"); you may not use this file except in compliance with
10    the License. You may obtain a copy of the License at
11
12       http://www.apache.org/licenses/LICENSE-2.0
13
14    Unless required by applicable law or agreed to in writing, software
15    distributed under the License is distributed on an "AS IS" BASIS,
16    WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
17    See the License for the specific language governing permissions and
18    limitations under the License.
19
20  */
21
22 package org.apache.derby.impl.sql.compile;
23
24 import org.apache.derby.iapi.sql.compile.CostEstimate;
25
26 import org.apache.derby.iapi.store.access.StoreCostResult;
27
28 import org.apache.derby.iapi.services.sanity.SanityManager;
29
30 import org.apache.derby.impl.sql.compile.CostEstimateImpl;
31
32 public class Level2CostEstimateImpl extends CostEstimateImpl
33 {
34     public Level2CostEstimateImpl()
35     {
36     }
37
38     public Level2CostEstimateImpl(double theCost,
39                             double theRowCount,
40                             double theSingleScanRowCount)
41     {
42         super(theCost, theRowCount, theSingleScanRowCount);
43     }
44
45     /** @see CostEstimate#cloneMe */
46     public CostEstimate cloneMe()
47     {
48         return new Level2CostEstimateImpl(cost,
49                                     rowCount,
50                                     singleScanRowCount);
51     }
52
53     public String JavaDoc toString()
54     {
55         return "Level2CostEstimateImpl: at " + hashCode() + ", cost == " + cost +
56                 ", rowCount == " + rowCount +
57                 ", singleScanRowCount == " + singleScanRowCount;
58     }
59
60     public CostEstimateImpl setState(double theCost,
61                                         double theRowCount,
62                                         CostEstimateImpl retval)
63     {
64         if (retval == null)
65         {
66             retval = new Level2CostEstimateImpl();
67         }
68
69         return super.setState(theCost, theRowCount, retval);
70     }
71 }
72
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