Source Code Cross Referenced for DefaultNode.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.DefaultNode
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.sql.compile.CompilerContext;
031:        import org.apache.derby.iapi.sql.compile.Parser;
032:        import org.apache.derby.iapi.sql.compile.C_NodeTypes;
033:
034:        import org.apache.derby.iapi.sql.conn.LanguageConnectionContext;
035:
036:        import org.apache.derby.iapi.types.TypeId;
037:
038:        import org.apache.derby.iapi.sql.dictionary.ColumnDescriptor;
039:        import org.apache.derby.iapi.sql.dictionary.DataDictionary;
040:        import org.apache.derby.iapi.sql.dictionary.DefaultDescriptor;
041:        import org.apache.derby.iapi.sql.dictionary.TableDescriptor;
042:
043:        import org.apache.derby.iapi.error.StandardException;
044:
045:        import org.apache.derby.impl.sql.compile.ExpressionClassBuilder;
046:
047:        import org.apache.derby.catalog.types.DefaultInfoImpl;
048:
049:        import java.util.Vector;
050:
051:        /**
052:         * DefaultNode represents a column/parameter default.
053:         */
054:        public class DefaultNode extends ValueNode {
055:            private String columnName;
056:            private String defaultText;
057:            private ValueNode defaultTree;
058:
059:            /**
060:             * Initializer for a column/parameter default.
061:             *
062:             * @param defaultTree			Query tree for default
063:             * @param defaultText	The text of the default.
064:             */
065:            public void init(Object defaultTree, Object defaultText) {
066:                this .defaultTree = (ValueNode) defaultTree;
067:                this .defaultText = (String) defaultText;
068:            }
069:
070:            /**
071:             * Initializer for insert/update
072:             *
073:             */
074:            public void init(Object columnName) {
075:                this .columnName = (String) columnName;
076:            }
077:
078:            /**
079:             * Get the text of the default.
080:             */
081:            public String getDefaultText() {
082:                return defaultText;
083:            }
084:
085:            /**
086:             * Get the query tree for the default.
087:             *
088:             * @return The query tree for the default.
089:             */
090:            ValueNode getDefaultTree() {
091:                return defaultTree;
092:            }
093:
094:            /**
095:             * Convert this object to a String.  See comments in QueryTreeNode.java
096:             * for how this should be done for tree printing.
097:             *
098:             * @return	This object as a String
099:             */
100:
101:            public String toString() {
102:                if (SanityManager.DEBUG) {
103:                    return "defaultTree: " + defaultTree + "\n"
104:                            + "defaultText: " + defaultText + "\n"
105:                            + super .toString();
106:                } else {
107:                    return "";
108:                }
109:            }
110:
111:            /**
112:             * Bind this expression.  This means binding the sub-expressions,
113:             * as well as figuring out what the return type is for this expression.
114:             * In this case, there are no sub-expressions, and the return type
115:             * is already known, so this is just a stub.
116:             *
117:             * @param fromList		The FROM list for the query this
118:             *				expression is in, for binding columns.
119:             * @param subqueryList		The subquery list being built as we find SubqueryNodes
120:             * @param aggregateVector	The aggregate vector being built as we find AggregateNodes
121:             *
122:             * @return	The new top of the expression tree.
123:             *
124:             * @exception StandardException		Thrown on failure
125:             */
126:            public ValueNode bindExpression(FromList fromList,
127:                    SubqueryList subqueryList, Vector aggregateVector)
128:                    throws StandardException {
129:                ColumnDescriptor cd;
130:                TableDescriptor td;
131:
132:                if (SanityManager.DEBUG) {
133:                    SanityManager.ASSERT(fromList.size() != 0,
134:                            "fromList expected to be non-empty");
135:                    if (!(fromList.elementAt(0) instanceof  FromBaseTable)) {
136:                        SanityManager
137:                                .THROWASSERT("fromList.elementAt(0) expected to be instanceof FromBaseTable, not "
138:                                        + fromList.elementAt(0).getClass()
139:                                                .getName());
140:                    }
141:
142:                }
143:                // Get the TableDescriptor for the target table
144:                td = ((FromBaseTable) fromList.elementAt(0))
145:                        .getTableDescriptor();
146:
147:                // Get the ColumnDescriptor for the column
148:                cd = td.getColumnDescriptor(columnName);
149:                if (SanityManager.DEBUG) {
150:                    SanityManager.ASSERT(cd != null,
151:                            "cd expected to be non-null");
152:                }
153:
154:                /* If we have the default text, then parse and bind it and
155:                 * return the tree.
156:                 */
157:                DefaultInfoImpl defaultInfo = (DefaultInfoImpl) cd
158:                        .getDefaultInfo();
159:                if (defaultInfo != null) {
160:                    String defaultText = defaultInfo.getDefaultText();
161:                    ValueNode defaultTree = parseDefault(defaultText,
162:                            getLanguageConnectionContext(),
163:                            getCompilerContext());
164:
165:                    /* Query is dependent on the DefaultDescriptor */
166:                    DefaultDescriptor defaultDescriptor = cd
167:                            .getDefaultDescriptor(getDataDictionary());
168:                    getCompilerContext().createDependency(defaultDescriptor);
169:
170:                    return defaultTree.bindExpression(fromList, subqueryList,
171:                            aggregateVector);
172:                } else {
173:                    // Default is null
174:                    ValueNode nullNode = (ValueNode) getNodeFactory().getNode(
175:                            C_NodeTypes.UNTYPED_NULL_CONSTANT_NODE,
176:                            getContextManager());
177:                    return nullNode;
178:                }
179:            }
180:
181:            /**
182:             *	Parse a default and turn it into a query tree.
183:             *
184:             *	@param	defaultText			Text of Default.
185:             * @param	lcc					LanguageConnectionContext
186:             * @param	cc					CompilerContext
187:             *
188:             * @return	The parsed default as a query tree.
189:             *
190:             * @exception StandardException		Thrown on failure
191:             */
192:            public static ValueNode parseDefault(String defaultText,
193:                    LanguageConnectionContext lcc, CompilerContext cc)
194:                    throws StandardException {
195:                Parser p;
196:                ValueNode defaultTree;
197:
198:                /* Get a Statement to pass to the parser */
199:
200:                /* We're all set up to parse. We have to build a compilable SQL statement
201:                 * before we can parse -  So, we goober up a VALUES defaultText.
202:                 */
203:                String values = "VALUES " + defaultText;
204:
205:                /*
206:                 ** Get a new compiler context, so the parsing of the select statement
207:                 ** doesn't mess up anything in the current context (it could clobber
208:                 ** the ParameterValueSet, for example).
209:                 */
210:                CompilerContext newCC = lcc.pushCompilerContext();
211:
212:                p = newCC.getParser();
213:
214:                /* Finally, we can call the parser */
215:                // Since this is always nested inside another SQL statement, so topLevel flag
216:                // should be false
217:                QueryTreeNode qt = p.parseStatement(values);
218:                if (SanityManager.DEBUG) {
219:                    if (!(qt instanceof  CursorNode)) {
220:                        SanityManager
221:                                .THROWASSERT("qt expected to be instanceof CursorNode, not "
222:                                        + qt.getClass().getName());
223:                    }
224:                    CursorNode cn = (CursorNode) qt;
225:                    if (!(cn.getResultSetNode() instanceof  RowResultSetNode)) {
226:                        SanityManager
227:                                .THROWASSERT("cn.getResultSetNode() expected to be instanceof RowResultSetNode, not "
228:                                        + cn.getResultSetNode().getClass()
229:                                                .getName());
230:                    }
231:                }
232:
233:                defaultTree = ((ResultColumn) ((CursorNode) qt)
234:                        .getResultSetNode().getResultColumns().elementAt(0))
235:                        .getExpression();
236:
237:                lcc.popCompilerContext(newCC);
238:
239:                return defaultTree;
240:            }
241:
242:            /**
243:             * @exception StandardException		Thrown on failure
244:             */
245:            public void generateExpression(ExpressionClassBuilder acb,
246:                    MethodBuilder mb) throws StandardException {
247:                if (SanityManager.DEBUG) {
248:                    SanityManager
249:                            .THROWASSERT("generateExpression not expected to be called");
250:                }
251:            }
252:
253:            /**
254:             * @inheritDoc
255:             */
256:            protected boolean isEquivalent(ValueNode other) {
257:                return false;
258:            }
259:        }
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