--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.sql.compile.LockTableNode\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.error.StandardException;\r
+import org.apache.derby.iapi.reference.SQLState;\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+import org.apache.derby.iapi.sql.compile.CompilerContext;\r
+import org.apache.derby.iapi.sql.conn.Authorizer;\r
+import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptor;\r
+import org.apache.derby.iapi.sql.dictionary.DataDictionary;\r
+import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor;\r
+import org.apache.derby.iapi.sql.dictionary.TableDescriptor;\r
+import org.apache.derby.iapi.sql.execute.ConstantAction;\r
+\r
+/**\r
+ * A LockTableNode is the root of a QueryTree that represents a LOCK TABLE command:\r
+ * LOCK TABLE <TableName> IN SHARE/EXCLUSIVE MODE\r
+ *\r
+ */\r
+\r
+public class LockTableNode extends MiscellaneousStatementNode\r
+{\r
+ private TableName tableName;\r
+ private boolean exclusiveMode;\r
+ private long conglomerateNumber;\r
+ private TableDescriptor lockTableDescriptor;\r
+\r
+ /**\r
+ * Initializer for LockTableNode\r
+ *\r
+ * @param tableName The table to lock\r
+ * @param exclusiveMode boolean, whether or not to get an exclusive lock.\r
+ */\r
+ public void init(Object tableName, Object exclusiveMode)\r
+ {\r
+ this.tableName = (TableName) tableName;\r
+ this.exclusiveMode = ((Boolean) exclusiveMode).booleanValue();\r
+ }\r
+\r
+ /**\r
+ * Convert this object to a String. See comments in QueryTreeNode.java\r
+ * for how this should be done for tree printing.\r
+ *\r
+ * @return This object as a String\r
+ */\r
+\r
+ public String toString()\r
+ {\r
+ if (SanityManager.DEBUG)\r
+ {\r
+ return "tableName: " + tableName + "\n" +\r
+ "exclusiveMode: " + exclusiveMode + "\n" +\r
+ "conglomerateNumber: " + conglomerateNumber + "\n" +\r
+ super.toString();\r
+ }\r
+ else\r
+ {\r
+ return "";\r
+ }\r
+ }\r
+\r
+ public String statementToString()\r
+ {\r
+ return "LOCK TABLE";\r
+ }\r
+\r
+ /**\r
+ * Bind this LockTableNode. This means looking up the table,\r
+ * verifying it exists and getting the heap conglomerate number.\r
+ *\r
+ *\r
+ * @exception StandardException Thrown on error\r
+ */\r
+\r
+ public void bindStatement() throws StandardException\r
+ {\r
+ CompilerContext cc = getCompilerContext();\r
+ ConglomerateDescriptor cd;\r
+ DataDictionary dd = getDataDictionary();\r
+ SchemaDescriptor sd;\r
+\r
+ String schemaName = tableName.getSchemaName();\r
+ sd = getSchemaDescriptor(schemaName);\r
+\r
+ // Users are not allowed to lock system tables\r
+ if (sd.isSystemSchema())\r
+ {\r
+ throw StandardException.newException(SQLState.LANG_NO_USER_DDL_IN_SYSTEM_SCHEMA, \r
+ statementToString(), schemaName);\r
+ }\r
+\r
+ lockTableDescriptor = getTableDescriptor(tableName.getTableName(), sd);\r
+\r
+ if (lockTableDescriptor == null)\r
+ {\r
+ // Check if the reference is for a synonym.\r
+ TableName synonymTab = resolveTableToSynonym(tableName);\r
+ if (synonymTab == null)\r
+ throw StandardException.newException(SQLState.LANG_TABLE_NOT_FOUND, tableName);\r
+ tableName = synonymTab;\r
+ sd = getSchemaDescriptor(tableName.getSchemaName());\r
+\r
+ lockTableDescriptor = getTableDescriptor(synonymTab.getTableName(), sd);\r
+ if (lockTableDescriptor == null)\r
+ throw StandardException.newException(SQLState.LANG_TABLE_NOT_FOUND, tableName);\r
+ }\r
+\r
+ //throw an exception if user is attempting to lock a temporary table\r
+ if (lockTableDescriptor.getTableType() == TableDescriptor.GLOBAL_TEMPORARY_TABLE_TYPE)\r
+ {\r
+ throw StandardException.newException(SQLState.LANG_NOT_ALLOWED_FOR_DECLARED_GLOBAL_TEMP_TABLE);\r
+ }\r
+\r
+ conglomerateNumber = lockTableDescriptor.getHeapConglomerateId();\r
+\r
+ /* Get the base conglomerate descriptor */\r
+ cd = lockTableDescriptor.getConglomerateDescriptor(conglomerateNumber);\r
+\r
+ /* Statement is dependent on the TableDescriptor and ConglomerateDescriptor */\r
+ cc.createDependency(lockTableDescriptor);\r
+ cc.createDependency(cd);\r
+\r
+ if (isPrivilegeCollectionRequired())\r
+ {\r
+ // need SELECT privilege to perform lock table statement.\r
+ cc.pushCurrentPrivType(Authorizer.SELECT_PRIV);\r
+ cc.addRequiredTablePriv(lockTableDescriptor);\r
+ cc.popCurrentPrivType();\r
+ }\r
+ }\r
+\r
+ /**\r
+ * Return true if the node references SESSION schema tables (temporary or permanent)\r
+ *\r
+ * @return true if references SESSION schema tables, else false\r
+ *\r
+ * @exception StandardException Thrown on error\r
+ */\r
+ public boolean referencesSessionSchema()\r
+ throws StandardException\r
+ {\r
+ //If lock table is on a SESSION schema table, then return true. \r
+ return isSessionSchema(lockTableDescriptor.getSchemaName());\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().getLockTableConstantAction(\r
+ tableName.getFullTableName(),\r
+ conglomerateNumber,\r
+ exclusiveMode);\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff