Source Code Cross Referenced for DropIndexNode.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.DropIndexNode
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.sql.compile.CompilerContext;
027:
028:        import org.apache.derby.iapi.sql.dictionary.ConglomerateDescriptor;
029:        import org.apache.derby.iapi.sql.dictionary.ConstraintDescriptor;
030:        import org.apache.derby.iapi.sql.dictionary.DataDictionary;
031:        import org.apache.derby.iapi.sql.dictionary.DataDictionaryContext;
032:        import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor;
033:        import org.apache.derby.iapi.sql.dictionary.TableDescriptor;
034:
035:        import org.apache.derby.iapi.reference.SQLState;
036:
037:        import org.apache.derby.iapi.sql.execute.ConstantAction;
038:
039:        import org.apache.derby.iapi.sql.dictionary.SchemaDescriptor;
040:
041:        import org.apache.derby.iapi.error.StandardException;
042:
043:        /**
044:         * A DropIndexNode is the root of a QueryTree that represents a DROP INDEX
045:         * statement.
046:         *
047:         * @author Jeff Lichtman
048:         */
049:
050:        public class DropIndexNode extends DDLStatementNode {
051:            private ConglomerateDescriptor cd;
052:            private TableDescriptor td;
053:
054:            public String statementToString() {
055:                return "DROP INDEX";
056:            }
057:
058:            /**
059:             * Bind this DropIndexNode.  This means looking up the index,
060:             * verifying it exists and getting the conglomerate number.
061:             *
062:             * @return	The bound query tree
063:             *
064:             * @exception StandardException		Thrown on error
065:             */
066:            public QueryTreeNode bind() throws StandardException {
067:                CompilerContext cc = getCompilerContext();
068:                DataDictionary dd = getDataDictionary();
069:                SchemaDescriptor sd;
070:
071:                sd = getSchemaDescriptor();
072:
073:                if (sd.getUUID() != null)
074:                    cd = dd.getConglomerateDescriptor(getRelativeName(), sd,
075:                            false);
076:
077:                if (cd == null) {
078:                    throw StandardException.newException(
079:                            SQLState.LANG_INDEX_NOT_FOUND, getFullName());
080:                }
081:
082:                /* Get the table descriptor */
083:                td = getTableDescriptor(cd.getTableID());
084:
085:                /* Drop index is not allowed on an index backing a constraint -
086:                 * user must drop the constraint, which will drop the index.
087:                 * Drop constraint drops the constraint before the index,
088:                 * so it's okay to drop a backing index if we can't find its
089:                 * ConstraintDescriptor.
090:                 */
091:                if (cd.isConstraint()) {
092:                    ConstraintDescriptor conDesc;
093:                    String constraintName;
094:
095:                    conDesc = dd.getConstraintDescriptor(td, cd.getUUID());
096:                    if (conDesc != null) {
097:                        constraintName = conDesc.getConstraintName();
098:                        throw StandardException.newException(
099:                                SQLState.LANG_CANT_DROP_BACKING_INDEX,
100:                                getFullName(), constraintName);
101:                    }
102:                }
103:
104:                /* Statement is dependent on the TableDescriptor and ConglomerateDescriptor */
105:                cc.createDependency(td);
106:                cc.createDependency(cd);
107:
108:                return this ;
109:            }
110:
111:            // inherit generate() method from DDLStatementNode
112:
113:            /**
114:             * Create the Constant information that will drive the guts of Execution.
115:             *
116:             * @exception StandardException		Thrown on failure
117:             */
118:            public ConstantAction makeConstantAction() throws StandardException {
119:                return getGenericConstantActionFactory()
120:                        .getDropIndexConstantAction(getFullName(),
121:                                getRelativeName(), getRelativeName(),
122:                                getSchemaDescriptor().getSchemaName(),
123:                                td.getUUID(), td.getHeapConglomerateId());
124:            }
125:        }
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