Source Code Cross Referenced for SetTransactionIsolationNode.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » sql » compile » Java Source Code / Java DocumentationJava Source Code and Java Documentation

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Java Source Code / Java Documentation » Database DBMS » db derby 10.2 » org.apache.derby.impl.sql.compile 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.impl.sql.compile.SetTransactionIsolationNode
004:
005:           Licensed to the Apache Software Foundation (ASF) under one or more
006:           contributor license agreements.  See the NOTICE file distributed with
007:           this work for additional information regarding copyright ownership.
008:           The ASF licenses this file to you under the Apache License, Version 2.0
009:           (the "License"); you may not use this file except in compliance with
010:           the License.  You may obtain a copy of the License at
011:
012:              http://www.apache.org/licenses/LICENSE-2.0
013:
014:           Unless required by applicable law or agreed to in writing, software
015:           distributed under the License is distributed on an "AS IS" BASIS,
016:           WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
017:           See the License for the specific language governing permissions and
018:           limitations under the License.
019:
020:         */
021:
022:        package org.apache.derby.impl.sql.compile;
023:
024:        import org.apache.derby.iapi.services.context.ContextManager;
025:
026:        import org.apache.derby.iapi.services.compiler.MethodBuilder;
027:
028:        import org.apache.derby.iapi.error.StandardException;
029:
030:        import org.apache.derby.iapi.sql.execute.ConstantAction;
031:
032:        import org.apache.derby.iapi.sql.Activation;
033:        import org.apache.derby.iapi.sql.ResultSet;
034:
035:        import org.apache.derby.impl.sql.compile.ActivationClassBuilder;
036:
037:        import org.apache.derby.iapi.services.sanity.SanityManager;
038:        import org.apache.derby.iapi.reference.ClassName;
039:        import org.apache.derby.iapi.services.classfile.VMOpcode;
040:
041:        /**
042:         * A SetTransactionIsolationNode is the root of a QueryTree that represents a SET
043:         * TRANSACTION ISOLATION command
044:         *
045:         * @author Jerry Brenner
046:         */
047:
048:        public class SetTransactionIsolationNode extends
049:                TransactionStatementNode {
050:            private int isolationLevel;
051:
052:            /**
053:             * Initializer for SetTransactionIsolationNode
054:             *
055:             * @param isolationLevel		The new isolation level
056:             */
057:            public void init(Object isolationLevel) {
058:                this .isolationLevel = ((Integer) isolationLevel).intValue();
059:            }
060:
061:            /**
062:             * Convert this object to a String.  See comments in QueryTreeNode.java
063:             * for how this should be done for tree printing.
064:             *
065:             * @return	This object as a String
066:             */
067:
068:            public String toString() {
069:                if (SanityManager.DEBUG) {
070:                    return "isolationLevel: " + isolationLevel + "\n"
071:                            + super .toString();
072:                } else {
073:                    return "";
074:                }
075:            }
076:
077:            public String statementToString() {
078:                return "SET TRANSACTION ISOLATION";
079:            }
080:
081:            /**
082:             * generates a the code.
083:             *
084:             * @param acb the activation class builder for this statement
085:             * @param mb	The method for the method to be built
086:             * @exception StandardException thrown if generation fails
087:             */
088:            public void generate(ActivationClassBuilder acb, MethodBuilder mb)
089:                    throws StandardException {
090:                acb.pushGetResultSetFactoryExpression(mb);
091:
092:                acb.pushThisAsActivation(mb);
093:
094:                mb.callMethod(VMOpcode.INVOKEINTERFACE, (String) null,
095:                        "getSetTransactionResultSet", ClassName.ResultSet, 1);
096:            }
097:
098:            /**
099:             * Create the Constant information that will drive the guts of Execution.
100:             *
101:             * @exception StandardException		Thrown on failure
102:             */
103:            public ConstantAction makeConstantAction() throws StandardException {
104:                return getGenericConstantActionFactory()
105:                        .getSetTransactionIsolationConstantAction(
106:                                isolationLevel);
107:            }
108:        }
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