/*
Derby - Class org.apache.derby.impl.sql.execute.SetSchemaConstantAction
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.sql.execute.ConstantAction;
import org.apache.derby.iapi.sql.dictionary.DataDictionary;
import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor;
import org.apache.derby.iapi.sql.conn.LanguageConnectionContext;
import org.apache.derby.iapi.sql.ParameterValueSet;
import org.apache.derby.iapi.sql.StatementType;
import org.apache.derby.iapi.types.DataValueDescriptor;
import org.apache.derby.iapi.error.StandardException;
import org.apache.derby.iapi.sql.Activation;
import org.apache.derby.iapi.services.sanity.SanityManager;
import org.apache.derby.iapi.reference.SQLState;
/**
* This class describes actions that are ALWAYS performed for a
* SET SCHEMA Statement at Execution time.
*
* @author jamie
*/
class SetSchemaConstantAction extends GenericConstantAction
{
private final String schemaName;
private final int type;
// CONSTRUCTORS
/**
* Make the ConstantAction for a SET SCHEMA statement.
*
* @param schemaName Name of schema.
* @param type type of set schema (e.g. SET_SCHEMA_DYNAMIC, SET_SCHEMA_USER)
*/
SetSchemaConstantAction(String schemaName, int type)
{
this.schemaName = schemaName;
this.type = type;
}
///////////////////////////////////////////////
//
// OBJECT SHADOWS
//
///////////////////////////////////////////////
public String toString()
{
// Do not put this under SanityManager.DEBUG - it is needed for
// error reporting.
// if the error happens after we have figured out the schema name for
// dynamic we want to use it rather than ?
return "SET SCHEMA " + ((type == StatementType.SET_SCHEMA_USER) ? "USER" :
((type == StatementType.SET_SCHEMA_DYNAMIC && schemaName == null) ? "?" : schemaName));
}
// INTERFACE METHODS
/**
* This is the guts of the Execution-time logic for CREATE SCHEMA.
*
* @see ConstantAction#executeConstantAction
*
* @exception StandardException Thrown on failure
*/
public void executeConstantAction( Activation activation )
throws StandardException
{
LanguageConnectionContext lcc;
DataDictionary dd;
// find the language context.
lcc = activation.getLanguageConnectionContext();
dd = lcc.getDataDictionary();
String thisSchemaName = schemaName;
if (type == StatementType.SET_SCHEMA_DYNAMIC)
{
ParameterValueSet pvs = activation.getParameterValueSet();
DataValueDescriptor dvs = pvs.getParameter(0);
thisSchemaName = dvs.getString();
//null parameter is not allowed
if (thisSchemaName == null || thisSchemaName.length() > 128)
throw StandardException.newException(SQLState.LANG_DB2_REPLACEMENT_ERROR, "CURRENT SCHEMA");
}
else if (type == StatementType.SET_SCHEMA_USER)
{
thisSchemaName = lcc.getAuthorizationId();
}
// if schemaName is null, sd will be null and default schema will be used
SchemaDescriptor sd = dd.getSchemaDescriptor(thisSchemaName, null, true);
lcc.setDefaultSchema(sd);
}
}