Source Code Cross Referenced for LockTableNode.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.LockTableNode
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.services.sanity.SanityManager;
029:
030:        import org.apache.derby.iapi.error.StandardException;
031:
032:        import org.apache.derby.iapi.sql.compile.CompilerContext;
033:
034:        import org.apache.derby.iapi.sql.conn.Authorizer;
035:
036:        import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptor;
037:        import org.apache.derby.iapi.sql.dictionary.DataDictionary;
038:        import org.apache.derby.iapi.sql.dictionary.DataDictionaryContext;
039:        import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor;
040:        import org.apache.derby.iapi.sql.dictionary.TableDescriptor;
041:
042:        import org.apache.derby.iapi.reference.SQLState;
043:
044:        import org.apache.derby.iapi.sql.execute.ConstantAction;
045:
046:        import org.apache.derby.iapi.sql.Activation;
047:        import org.apache.derby.iapi.sql.ResultSet;
048:        import org.apache.derby.iapi.reference.ClassName;
049:
050:        import org.apache.derby.impl.sql.compile.ActivationClassBuilder;
051:        import org.apache.derby.iapi.services.classfile.VMOpcode;
052:
053:        /**
054:         * A LockTableNode is the root of a QueryTree that represents a LOCK TABLE command:
055:         *	LOCK TABLE <TableName> IN SHARE/EXCLUSIVE MODE
056:         *
057:         * @author Jerry Brenner
058:         */
059:
060:        public class LockTableNode extends MiscellaneousStatementNode {
061:            private TableName tableName;
062:            private boolean exclusiveMode;
063:            private long conglomerateNumber;
064:            private TableDescriptor lockTableDescriptor;
065:
066:            /**
067:             * Initializer for LockTableNode
068:             *
069:             * @param tableName		The table to lock
070:             * @param exclusiveMode	boolean, whether or not to get an exclusive lock.
071:             */
072:            public void init(Object tableName, Object exclusiveMode) {
073:                this .tableName = (TableName) tableName;
074:                this .exclusiveMode = ((Boolean) exclusiveMode).booleanValue();
075:            }
076:
077:            /**
078:             * Convert this object to a String.  See comments in QueryTreeNode.java
079:             * for how this should be done for tree printing.
080:             *
081:             * @return	This object as a String
082:             */
083:
084:            public String toString() {
085:                if (SanityManager.DEBUG) {
086:                    return "tableName: " + tableName + "\n" + "exclusiveMode: "
087:                            + exclusiveMode + "\n" + "conglomerateNumber: "
088:                            + conglomerateNumber + "\n" + super .toString();
089:                } else {
090:                    return "";
091:                }
092:            }
093:
094:            public String statementToString() {
095:                return "LOCK TABLE";
096:            }
097:
098:            /**
099:             * Bind this LockTableNode.  This means looking up the table,
100:             * verifying it exists and getting the heap conglomerate number.
101:             *
102:             * @return	The bound query tree
103:             *
104:             * @exception StandardException		Thrown on error
105:             */
106:
107:            public QueryTreeNode bind() throws StandardException {
108:                CompilerContext cc = getCompilerContext();
109:                ConglomerateDescriptor cd;
110:                DataDictionary dd = getDataDictionary();
111:                SchemaDescriptor sd;
112:
113:                String schemaName = tableName.getSchemaName();
114:                sd = getSchemaDescriptor(schemaName);
115:
116:                // Users are not allowed to lock system tables
117:                if (sd.isSystemSchema()) {
118:                    throw StandardException.newException(
119:                            SQLState.LANG_NO_USER_DDL_IN_SYSTEM_SCHEMA,
120:                            statementToString(), schemaName);
121:                }
122:
123:                lockTableDescriptor = getTableDescriptor(tableName
124:                        .getTableName(), sd);
125:
126:                if (lockTableDescriptor == null) {
127:                    // Check if the reference is for a synonym.
128:                    TableName synonymTab = resolveTableToSynonym(tableName);
129:                    if (synonymTab == null)
130:                        throw StandardException.newException(
131:                                SQLState.LANG_TABLE_NOT_FOUND, tableName);
132:                    tableName = synonymTab;
133:                    sd = getSchemaDescriptor(tableName.getSchemaName());
134:
135:                    lockTableDescriptor = getTableDescriptor(synonymTab
136:                            .getTableName(), sd);
137:                    if (lockTableDescriptor == null)
138:                        throw StandardException.newException(
139:                                SQLState.LANG_TABLE_NOT_FOUND, tableName);
140:                }
141:
142:                //throw an exception if user is attempting to lock a temporary table
143:                if (lockTableDescriptor.getTableType() == TableDescriptor.GLOBAL_TEMPORARY_TABLE_TYPE) {
144:                    throw StandardException
145:                            .newException(SQLState.LANG_NOT_ALLOWED_FOR_DECLARED_GLOBAL_TEMP_TABLE);
146:                }
147:
148:                conglomerateNumber = lockTableDescriptor
149:                        .getHeapConglomerateId();
150:
151:                /* Get the base conglomerate descriptor */
152:                cd = lockTableDescriptor
153:                        .getConglomerateDescriptor(conglomerateNumber);
154:
155:                /* Statement is dependent on the TableDescriptor and ConglomerateDescriptor */
156:                cc.createDependency(lockTableDescriptor);
157:                cc.createDependency(cd);
158:
159:                if (isPrivilegeCollectionRequired()) {
160:                    // need SELECT privilege to perform lock table statement.
161:                    cc.pushCurrentPrivType(Authorizer.SELECT_PRIV);
162:                    cc.addRequiredTablePriv(lockTableDescriptor);
163:                    cc.popCurrentPrivType();
164:                }
165:
166:                return this ;
167:            }
168:
169:            /**
170:             * Return true if the node references SESSION schema tables (temporary or permanent)
171:             *
172:             * @return	true if references SESSION schema tables, else false
173:             *
174:             * @exception StandardException		Thrown on error
175:             */
176:            public boolean referencesSessionSchema() throws StandardException {
177:                //If lock table is on a SESSION schema table, then return true. 
178:                return isSessionSchema(lockTableDescriptor.getSchemaName());
179:            }
180:
181:            /**
182:             * Create the Constant information that will drive the guts of Execution.
183:             *
184:             * @exception StandardException		Thrown on failure
185:             */
186:            public ConstantAction makeConstantAction() throws StandardException {
187:                return getGenericConstantActionFactory()
188:                        .getLockTableConstantAction(
189:                                tableName.getFullTableName(),
190:                                conglomerateNumber, exclusiveMode);
191:            }
192:        }
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