Source Code Cross Referenced for TableElementNode.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.TableElementNode
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.sanity.SanityManager;
025:
026:        /**
027:         * A TableElementNode is an item in a TableElementList, and represents
028:         * a single table element such as a column or constraint in a CREATE TABLE
029:         * or ALTER TABLE statement.
030:         *
031:         * @author Jeff Lichtman
032:         */
033:
034:        public class TableElementNode extends QueryTreeNode {
035:            /////////////////////////////////////////////////////////////////////////
036:            //
037:            //	CONSTANTS
038:            //
039:            /////////////////////////////////////////////////////////////////////////
040:
041:            public static final int AT_UNKNOWN = 0;
042:            public static final int AT_ADD_FOREIGN_KEY_CONSTRAINT = 1;
043:            public static final int AT_ADD_PRIMARY_KEY_CONSTRAINT = 2;
044:            public static final int AT_ADD_UNIQUE_CONSTRAINT = 3;
045:            public static final int AT_ADD_CHECK_CONSTRAINT = 4;
046:            public static final int AT_DROP_CONSTRAINT = 5;
047:            public static final int AT_MODIFY_COLUMN = 6;
048:            public static final int AT_DROP_COLUMN = 7;
049:
050:            /////////////////////////////////////////////////////////////////////////
051:            //
052:            //	STATE
053:            //
054:            /////////////////////////////////////////////////////////////////////////
055:
056:            String name;
057:            int elementType; // simple element nodes can share this class,
058:
059:            // eg., drop column and rename table/column/index
060:            // etc., no need for more classes, an effort to
061:            // minimize footprint
062:
063:            /////////////////////////////////////////////////////////////////////////
064:            //
065:            //	BEHAVIOR
066:            //
067:            /////////////////////////////////////////////////////////////////////////
068:
069:            /**
070:             * Initializer for a TableElementNode
071:             *
072:             * @param name	The name of the table element, if any
073:             */
074:
075:            public void init(Object name) {
076:                this .name = (String) name;
077:            }
078:
079:            /**
080:             * Initializer for a TableElementNode
081:             *
082:             * @param name	The name of the table element, if any
083:             */
084:
085:            public void init(Object name, Object elementType) {
086:                this .name = (String) name;
087:                this .elementType = ((Integer) elementType).intValue();
088:            }
089:
090:            /**
091:             * Convert this object to a String.  See comments in QueryTreeNode.java
092:             * for how this should be done for tree printing.
093:             *
094:             * @return	This object as a String
095:             */
096:
097:            public String toString() {
098:                if (SanityManager.DEBUG) {
099:                    return "name: " + name + "\n" + super .toString();
100:                } else {
101:                    return "";
102:                }
103:            }
104:
105:            /**
106:             * Does this element have a primary key constraint.
107:             *
108:             * @return boolean	Whether or not this element has a primary key constraint
109:             */
110:            boolean hasPrimaryKeyConstraint() {
111:                return false;
112:            }
113:
114:            /**
115:             * Does this element have a unique key constraint.
116:             *
117:             * @return boolean	Whether or not this element has a unique key constraint
118:             */
119:            boolean hasUniqueKeyConstraint() {
120:                return false;
121:            }
122:
123:            /**
124:             * Does this element have a foreign key constraint.
125:             *
126:             * @return boolean	Whether or not this element has a foreign key constraint
127:             */
128:            boolean hasForeignKeyConstraint() {
129:                return false;
130:            }
131:
132:            /**
133:             * Does this element have a check constraint.
134:             *
135:             * @return boolean	Whether or not this element has a check constraint
136:             */
137:            boolean hasCheckConstraint() {
138:                return false;
139:            }
140:
141:            /**
142:             * Does this element have a constraint on it.
143:             *
144:             * @return boolean	Whether or not this element has a constraint on it
145:             */
146:            boolean hasConstraint() {
147:                return false;
148:            }
149:
150:            /**
151:             * Get the name from this node.
152:             *
153:             * @return String	The name.
154:             */
155:            public String getName() {
156:                return name;
157:            }
158:
159:            /**
160:             *	Get the type of this table element.
161:             *
162:             *	@return	one of the constants at the front of this file
163:             */
164:            int getElementType() {
165:                if (hasForeignKeyConstraint()) {
166:                    return AT_ADD_FOREIGN_KEY_CONSTRAINT;
167:                } else if (hasPrimaryKeyConstraint()) {
168:                    return AT_ADD_PRIMARY_KEY_CONSTRAINT;
169:                } else if (hasUniqueKeyConstraint()) {
170:                    return AT_ADD_UNIQUE_CONSTRAINT;
171:                } else if (hasCheckConstraint()) {
172:                    return AT_ADD_CHECK_CONSTRAINT;
173:                } else if (this  instanceof  ConstraintDefinitionNode) {
174:                    return AT_DROP_CONSTRAINT;
175:                } else if (this  instanceof  ModifyColumnNode) {
176:                    return AT_MODIFY_COLUMN;
177:                } else {
178:                    return elementType;
179:                }
180:            }
181:
182:        }
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