/*
Derby - Class org.apache.derby.impl.sql.execute.DropSPSConstantAction
Copyright 1998, 2004 The Apache Software Foundation or its licensors, as applicable.
Licensed 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.execute;
import org.apache.derby.iapi.services.sanity.SanityManager;
import org.apache.derby.iapi.error.StandardException;
import org.apache.derby.iapi.sql.conn.LanguageConnectionContext;
import org.apache.derby.iapi.sql.dictionary.ColumnDescriptor;
import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptor;
import org.apache.derby.iapi.sql.dictionary.DataDescriptorGenerator;
import org.apache.derby.iapi.sql.dictionary.DataDictionary;
import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor;
import org.apache.derby.iapi.sql.dictionary.SPSDescriptor;
import org.apache.derby.iapi.sql.dictionary.TableDescriptor;
import org.apache.derby.iapi.sql.depend.Dependency;
import org.apache.derby.iapi.sql.depend.DependencyManager;
import org.apache.derby.iapi.reference.SQLState;
import org.apache.derby.iapi.sql.execute.ConstantAction;
import org.apache.derby.iapi.sql.Activation;
import org.apache.derby.iapi.store.access.TransactionController;
/**
* This class describes actions that are ALWAYS performed for a
* DROP STATEMENT Statement at Execution time.
*
* @author Jamie
*/
class DropSPSConstantAction extends DDLConstantAction
{
private final String spsName;
private final SchemaDescriptor sd;
// CONSTRUCTORS
/**
* Make the ConstantAction for a DROP STATEMENT statement.
*
* @param sd Schema that stored prepared statement lives in.
* @param spsName Name of the SPS
*
*/
DropSPSConstantAction(
SchemaDescriptor sd,
String spsName)
{
this.sd = sd;
this.spsName = spsName;
if (SanityManager.DEBUG)
{
SanityManager.ASSERT(sd != null, "SchemaDescriptor is null");
}
}
///////////////////////////////////////////////
//
// OBJECT SHADOWS
//
///////////////////////////////////////////////
public String toString()
{
// Do not put this under SanityManager.DEBUG - it is needed for
// error reporting.
String schemaName = "???";
if ( sd != null ) { schemaName = sd.getSchemaName(); }
return "DROP STATEMENT " + schemaName + "." + spsName;
}
// INTERFACE METHODS
/**
* This is the guts of the Execution-time logic for DROP STATEMENT.
*
* @see ConstantAction#executeConstantAction
*
* @exception StandardException Thrown on failure
*/
public void executeConstantAction( Activation activation )
throws StandardException
{
SPSDescriptor spsd;
ConglomerateDescriptor cd;
LanguageConnectionContext lcc = activation.getLanguageConnectionContext();
DataDictionary dd = lcc.getDataDictionary();
DependencyManager dm = dd.getDependencyManager();
/*
** Inform the data dictionary that we are about to write to it.
** There are several calls to data dictionary "get" methods here
** that might be done in "read" mode in the data dictionary, but
** it seemed safer to do this whole operation in "write" mode.
**
** We tell the data dictionary we're done writing at the end of
** the transaction.
*/
dd.startWriting(lcc);
/*
** Get the statement descriptor. We're responsible for raising
** the error if it isn't found
*/
spsd = dd.getSPSDescriptor(spsName, sd);
if (spsd == null)
{
throw StandardException.newException(SQLState.LANG_OBJECT_NOT_FOUND_DURING_EXECUTION, "STATEMENT",
(sd.getSchemaName() + "." + spsName));
}
/* Prepare all dependents to invalidate. (This is there chance
* to say that they can't be invalidated. For example, an open
* cursor referencing a table/sps that the user is attempting to
* drop.) If no one objects, then invalidate any dependent objects.
*/
dm.invalidateFor(spsd, DependencyManager.DROP_SPS, lcc);
/* Clear the dependencies for the sps */
spsd.makeInvalid(DependencyManager.DROP_SPS, lcc);
//dm.clearDependencies(spsd);
/* Drop the sps */
dd.dropSPSDescriptor(spsd, lcc.getTransactionExecute());
}
}