01: /*
02:
03: Derby - Class org.apache.derby.impl.sql.compile.Level2CostEstimateImpl
04:
05: Licensed to the Apache Software Foundation (ASF) under one or more
06: contributor license agreements. See the NOTICE file distributed with
07: this work for additional information regarding copyright ownership.
08: The ASF licenses this file to you under the Apache License, Version 2.0
09: (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: public Level2CostEstimateImpl() {
34: }
35:
36: public Level2CostEstimateImpl(double theCost, double theRowCount,
37: double theSingleScanRowCount) {
38: super (theCost, theRowCount, theSingleScanRowCount);
39: }
40:
41: /** @see CostEstimate#cloneMe */
42: public CostEstimate cloneMe() {
43: return new Level2CostEstimateImpl(cost, rowCount,
44: singleScanRowCount);
45: }
46:
47: public String toString() {
48: return "Level2CostEstimateImpl: at " + hashCode()
49: + ", cost == " + cost + ", rowCount == " + rowCount
50: + ", singleScanRowCount == " + singleScanRowCount;
51: }
52:
53: public CostEstimateImpl setState(double theCost,
54: double theRowCount, CostEstimateImpl retval) {
55: if (retval == null) {
56: retval = new Level2CostEstimateImpl();
57: }
58:
59: return super.setState(theCost, theRowCount, retval);
60: }
61: }
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