--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.sql.compile.DropAliasNode\r
+\r
+ Licensed to the Apache Software Foundation (ASF) under one or more\r
+ contributor license agreements. See the NOTICE file distributed with\r
+ this work for additional information regarding copyright ownership.\r
+ The ASF licenses this file to you under the Apache License, Version 2.0\r
+ (the "License"); you may not use this file except in compliance with\r
+ the License. You may obtain a copy of the License at\r
+\r
+ http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+ Unless required by applicable law or agreed to in writing, software\r
+ distributed under the License is distributed on an "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ See the License for the specific language governing permissions and\r
+ limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.impl.sql.compile;\r
+\r
+import org.apache.derby.iapi.sql.compile.C_NodeTypes;\r
+\r
+import org.apache.derby.iapi.services.context.ContextManager;\r
+\r
+import org.apache.derby.iapi.sql.execute.ConstantAction;\r
+\r
+import org.apache.derby.iapi.reference.SQLState;\r
+\r
+import org.apache.derby.iapi.error.StandardException;\r
+\r
+import org.apache.derby.iapi.services.monitor.Monitor;\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+\r
+import org.apache.derby.iapi.sql.dictionary.AliasDescriptor;\r
+import org.apache.derby.iapi.sql.dictionary.DataDictionary;\r
+import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor;\r
+\r
+import org.apache.derby.catalog.AliasInfo;\r
+\r
+/**\r
+ * A DropAliasNode represents a DROP ALIAS statement.\r
+ *\r
+ */\r
+\r
+public class DropAliasNode extends DDLStatementNode\r
+{\r
+ private char aliasType;\r
+ private char nameSpace;\r
+\r
+ /**\r
+ * Initializer for a DropAliasNode\r
+ *\r
+ * @param dropAliasName The name of the method alias being dropped\r
+ * @param aliasType Alias type\r
+ *\r
+ * @exception StandardException\r
+ */\r
+ public void init(Object dropAliasName, Object aliasType)\r
+ throws StandardException\r
+ {\r
+ TableName dropItem = (TableName) dropAliasName;\r
+ initAndCheck(dropItem);\r
+ this.aliasType = ((Character) aliasType).charValue();\r
+ \r
+ switch (this.aliasType)\r
+ {\r
+ case AliasInfo.ALIAS_TYPE_PROCEDURE_AS_CHAR:\r
+ nameSpace = AliasInfo.ALIAS_NAME_SPACE_PROCEDURE_AS_CHAR;\r
+ break;\r
+\r
+ case AliasInfo.ALIAS_TYPE_FUNCTION_AS_CHAR:\r
+ nameSpace = AliasInfo.ALIAS_NAME_SPACE_FUNCTION_AS_CHAR;\r
+ break;\r
+\r
+ case AliasInfo.ALIAS_TYPE_SYNONYM_AS_CHAR:\r
+ nameSpace = AliasInfo.ALIAS_NAME_SPACE_SYNONYM_AS_CHAR;\r
+ break;\r
+\r
+ default:\r
+ if (SanityManager.DEBUG)\r
+ {\r
+ SanityManager.THROWASSERT("bad type to DropAliasNode: "+this.aliasType);\r
+ }\r
+ }\r
+ }\r
+\r
+ public char getAliasType() { return aliasType; }\r
+\r
+ public String statementToString()\r
+ {\r
+ return "DROP ".concat(aliasTypeName(aliasType));\r
+ }\r
+\r
+ /**\r
+ * Bind this DropMethodAliasNode. \r
+ *\r
+ *\r
+ * @exception StandardException Thrown on error\r
+ */\r
+ public void bindStatement() throws StandardException\r
+ {\r
+ DataDictionary dataDictionary = getDataDictionary();\r
+ String aliasName = getRelativeName();\r
+\r
+ AliasDescriptor ad = null;\r
+ SchemaDescriptor sd = getSchemaDescriptor();\r
+ \r
+ if (sd.getUUID() != null) {\r
+ ad = dataDictionary.getAliasDescriptor\r
+ (sd.getUUID().toString(), aliasName, nameSpace );\r
+ }\r
+ if ( ad == null )\r
+ {\r
+ throw StandardException.newException(SQLState.LANG_OBJECT_DOES_NOT_EXIST, statementToString(), aliasName);\r
+ }\r
+\r
+ // User cannot drop a system alias\r
+ if (ad.getSystemAlias())\r
+ {\r
+ throw StandardException.newException(SQLState.LANG_CANNOT_DROP_SYSTEM_ALIASES, aliasName);\r
+ }\r
+\r
+ // Statement is dependent on the AliasDescriptor\r
+ getCompilerContext().createDependency(ad);\r
+ }\r
+\r
+ // inherit generate() method from DDLStatementNode\r
+\r
+\r
+ /**\r
+ * Create the Constant information that will drive the guts of Execution.\r
+ *\r
+ * @exception StandardException Thrown on failure\r
+ */\r
+ public ConstantAction makeConstantAction() throws StandardException\r
+ {\r
+ return getGenericConstantActionFactory().getDropAliasConstantAction(getSchemaDescriptor(), getRelativeName(), nameSpace);\r
+ }\r
+\r
+ /* returns the alias type name given the alias char type */\r
+ private static String aliasTypeName( char actualType)\r
+ {\r
+ String typeName = null;\r
+\r
+ switch ( actualType )\r
+ {\r
+ case AliasInfo.ALIAS_TYPE_PROCEDURE_AS_CHAR:\r
+ typeName = "PROCEDURE";\r
+ break;\r
+ case AliasInfo.ALIAS_TYPE_FUNCTION_AS_CHAR:\r
+ typeName = "FUNCTION";\r
+ break;\r
+ case AliasInfo.ALIAS_TYPE_SYNONYM_AS_CHAR:\r
+ typeName = "SYNONYM";\r
+ break;\r
+ }\r
+ return typeName;\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff