| /* |
| |
| Derby - Class org.apache.derby.impl.sql.compile.DropSchemaNode |
| |
| 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.iapi.services.context.ContextManager; |
| import org.apache.derby.shared.common.sanity.SanityManager; |
| import org.apache.derby.iapi.sql.conn.Authorizer; |
| import org.apache.derby.iapi.sql.conn.LanguageConnectionContext; |
| import org.apache.derby.iapi.sql.conn.StatementContext; |
| import org.apache.derby.iapi.sql.execute.ConstantAction; |
| |
| /** |
| * A DropSchemaNode is the root of a QueryTree that represents |
| * a DROP SCHEMA statement. |
| * |
| */ |
| |
| class DropSchemaNode extends DDLStatementNode |
| { |
| private int dropBehavior; |
| private String schemaName; |
| |
| /** |
| * Constructor for a DropSchemaNode |
| * |
| * @param schemaName The name of the object being dropped |
| * @param dropBehavior Drop behavior (RESTRICT | CASCADE) |
| * @param cm Context Manager |
| * |
| */ |
| DropSchemaNode(String schemaName, int dropBehavior, ContextManager cm) |
| { |
| super(null, cm); |
| this.schemaName = schemaName; |
| this.dropBehavior = dropBehavior; |
| } |
| |
| @Override |
| public void bindStatement() throws StandardException |
| { |
| /* |
| ** Users are not permitted to drop |
| ** the SYS or APP schemas. |
| */ |
| if (getDataDictionary().isSystemSchemaName(schemaName)) |
| { |
| throw(StandardException.newException( |
| SQLState.LANG_CANNOT_DROP_SYSTEM_SCHEMAS, this.schemaName)); |
| } |
| |
| /* |
| ** In SQL authorization mode, the current authorization identifier |
| ** must be either the owner of the schema or the database owner |
| ** in order for the schema object to be dropped. |
| */ |
| if (isPrivilegeCollectionRequired()) |
| { |
| LanguageConnectionContext lcc = getLanguageConnectionContext(); |
| StatementContext stx = lcc.getStatementContext(); |
| |
| String currentUser = stx.getSQLSessionContext().getCurrentUser(); |
| getCompilerContext().addRequiredSchemaPriv(schemaName, |
| currentUser, |
| Authorizer.DROP_SCHEMA_PRIV); |
| } |
| } |
| |
| /** |
| * Convert this object to a String. See comments in QueryTreeNode.java |
| * for how this should be done for tree printing. |
| * |
| * @return This object as a String |
| */ |
| @Override |
| public String toString() |
| { |
| if (SanityManager.DEBUG) |
| { |
| return super.toString() + |
| "dropBehavior: " + "\n" + dropBehavior + "\n"; |
| } |
| else |
| { |
| return ""; |
| } |
| } |
| |
| String statementToString() |
| { |
| return "DROP SCHEMA"; |
| } |
| |
| // inherit generate() method from DDLStatementNode |
| |
| |
| /** |
| * Create the Constant information that will drive the guts of Execution. |
| * |
| * @exception StandardException Thrown on failure |
| */ |
| @Override |
| public ConstantAction makeConstantAction() throws StandardException |
| { |
| return getGenericConstantActionFactory().getDropSchemaConstantAction(schemaName); |
| } |
| } |