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/*
Derby - Class org.apache.derby.impl.sql.compile.AccessPathImpl
Licensed to the Apache Software Foundation (ASF) under one or more
contributor license agreements. See the NOTICE file distributed with
this work for additional information regarding copyright ownership.
The ASF licenses this file to you under the Apache License, Version 2.0
(the "License"); you may not use this file except in compliance with
the License. You may obtain a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS,
WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
See the License for the specific language governing permissions and
limitations under the License.
*/
package org.apache.derby.impl.sql.compile;
import org.apache.derby.iapi.error.StandardException;
import org.apache.derby.iapi.reference.SQLState;
import org.apache.derby.shared.common.sanity.SanityManager;
import org.apache.derby.iapi.sql.compile.AccessPath;
import org.apache.derby.iapi.sql.compile.CostEstimate;
import org.apache.derby.iapi.sql.compile.JoinStrategy;
import org.apache.derby.iapi.sql.compile.Optimizer;
import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptor;
import org.apache.derby.iapi.sql.dictionary.ConstraintDescriptor;
import org.apache.derby.iapi.sql.dictionary.DataDictionary;
import org.apache.derby.iapi.sql.dictionary.TableDescriptor;
class AccessPathImpl implements AccessPath
{
ConglomerateDescriptor cd = null;
private CostEstimate costEstimate = null;
boolean coveringIndexScan = false;
boolean nonMatchingIndexScan = false;
JoinStrategy joinStrategy = null;
int lockMode;
Optimizer optimizer;
private String accessPathName = "";
AccessPathImpl(Optimizer optimizer)
{
this.optimizer = optimizer;
}
/** @see AccessPath#setConglomerateDescriptor */
public void setConglomerateDescriptor(ConglomerateDescriptor cd)
{
this.cd = cd;
}
/** @see AccessPath#getConglomerateDescriptor */
public ConglomerateDescriptor getConglomerateDescriptor()
{
return cd;
}
/** @see AccessPath#setCostEstimate */
public void setCostEstimate(CostEstimate costEstimate)
{
/*
** CostEstimates are mutable, so keep the best cost estimate in
** a copy.
*/
if (this.costEstimate == null)
{
if (costEstimate != null)
{
this.costEstimate = costEstimate.cloneMe();
}
}
else
{
if (costEstimate == null)
this.costEstimate = null;
else
this.costEstimate.setCost(costEstimate);
}
}
/** @see AccessPath#getCostEstimate */
public CostEstimate getCostEstimate()
{
return costEstimate;
}
/** @see AccessPath#setCoveringIndexScan */
public void setCoveringIndexScan(boolean coveringIndexScan)
{
this.coveringIndexScan = coveringIndexScan;
}
/** @see AccessPath#getCoveringIndexScan */
public boolean getCoveringIndexScan()
{
return coveringIndexScan;
}
/** @see AccessPath#setNonMatchingIndexScan */
public void setNonMatchingIndexScan(boolean nonMatchingIndexScan)
{
this.nonMatchingIndexScan = nonMatchingIndexScan;
}
/** @see AccessPath#getNonMatchingIndexScan */
public boolean getNonMatchingIndexScan()
{
return nonMatchingIndexScan;
}
/** @see AccessPath#setJoinStrategy */
public void setJoinStrategy(JoinStrategy joinStrategy)
{
this.joinStrategy = joinStrategy;
}
/** @see AccessPath#getJoinStrategy */
public JoinStrategy getJoinStrategy()
{
return joinStrategy;
}
/** @see AccessPath#setLockMode */
public void setLockMode(int lockMode)
{
this.lockMode = lockMode;
}
/** @see AccessPath#getLockMode */
public int getLockMode()
{
return lockMode;
}
/** @see AccessPath#copy */
public void copy(AccessPath copyFrom)
{
setConglomerateDescriptor(copyFrom.getConglomerateDescriptor());
setCostEstimate(copyFrom.getCostEstimate());
setCoveringIndexScan(copyFrom.getCoveringIndexScan());
setNonMatchingIndexScan(copyFrom.getNonMatchingIndexScan());
setJoinStrategy(copyFrom.getJoinStrategy());
setLockMode(copyFrom.getLockMode());
}
/** @see AccessPath#getOptimizer */
public Optimizer getOptimizer()
{
return optimizer;
}
@Override
public String toString()
{
if (SanityManager.DEBUG)
{
return "cd == " + cd +
", costEstimate == " + costEstimate +
", coveringIndexScan == " + coveringIndexScan +
", nonMatchingIndexScan == " + nonMatchingIndexScan +
", joinStrategy == " + joinStrategy +
", lockMode == " + lockMode +
", optimizer level == " + optimizer.getLevel();
}
else
{
return "";
}
}
/** @see AccessPath#initializeAccessPathName */
public void initializeAccessPathName(DataDictionary dd, TableDescriptor td)
throws StandardException
{
if (cd == null)
return;
if (cd.isConstraint())
{
ConstraintDescriptor constraintDesc =
dd.getConstraintDescriptor(td, cd.getUUID());
if (constraintDesc == null)
{
throw StandardException.newException(
SQLState.LANG_OBJECT_NOT_FOUND,
"CONSTRAINT on TABLE",
td.getName());
}
accessPathName = constraintDesc.getConstraintName();
}
else if (cd.isIndex())
{
accessPathName = cd.getConglomerateName();
}
else
{
accessPathName = "";
}
}
}