| /* |
| |
| Derby - Class org.apache.derby.impl.sql.compile.SetTransactionIsolationNode |
| |
| 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.ClassName; |
| import org.apache.derby.iapi.services.classfile.VMOpcode; |
| import org.apache.derby.iapi.services.compiler.MethodBuilder; |
| import org.apache.derby.iapi.services.context.ContextManager; |
| import org.apache.derby.shared.common.sanity.SanityManager; |
| import org.apache.derby.iapi.sql.execute.ConstantAction; |
| |
| /** |
| * A SetTransactionIsolationNode is the root of a QueryTree that represents a SET |
| * TRANSACTION ISOLATION command |
| * |
| */ |
| |
| class SetTransactionIsolationNode extends TransactionStatementNode |
| { |
| private int isolationLevel; |
| |
| /** |
| * Constructor for SetTransactionIsolationNode |
| * |
| * @param isolationLevel The new isolation level |
| * @param cm The context manager |
| */ |
| SetTransactionIsolationNode(int isolationLevel, ContextManager cm) |
| { |
| super(cm); |
| this.isolationLevel = isolationLevel; |
| } |
| |
| /** |
| * 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 "isolationLevel: " + isolationLevel + "\n" + |
| super.toString(); |
| } |
| else |
| { |
| return ""; |
| } |
| } |
| |
| String statementToString() |
| { |
| return "SET TRANSACTION ISOLATION"; |
| } |
| |
| /** |
| * generates a the code. |
| * |
| * @param acb the activation class builder for this statement |
| * @param mb The method for the method to be built |
| * @exception StandardException thrown if generation fails |
| */ |
| @Override |
| void generate(ActivationClassBuilder acb, MethodBuilder mb) |
| throws StandardException |
| { |
| acb.pushGetResultSetFactoryExpression(mb); |
| |
| acb.pushThisAsActivation(mb); |
| |
| mb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null, "getSetTransactionResultSet", ClassName.ResultSet, 1); |
| } |
| |
| |
| /** |
| * Create the Constant information that will drive the guts of Execution. |
| * |
| * @exception StandardException Thrown on failure |
| */ |
| @Override |
| public ConstantAction makeConstantAction() throws StandardException |
| { |
| return getGenericConstantActionFactory().getSetTransactionIsolationConstantAction(isolationLevel); |
| } |
| } |