Source Code Cross Referenced for RISetChecker.java in  » Database-DBMS » db-derby-10.2 » org » apache » derby » impl » sql » execute » 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.execute 
Source Cross Referenced  Class Diagram Java Document (Java Doc) 


001:        /*
002:
003:           Derby - Class org.apache.derby.impl.sql.execute.RISetChecker
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.execute;
023:
024:        import org.apache.derby.iapi.services.sanity.SanityManager;
025:        import org.apache.derby.iapi.error.StandardException;
026:
027:        import org.apache.derby.iapi.sql.execute.ExecRow;
028:        import org.apache.derby.iapi.sql.execute.ExecIndexRow;
029:        import org.apache.derby.iapi.store.access.TransactionController;
030:
031:        /**
032:         * Checks a set or referential integrity constraints.  Used
033:         * to shield the caller from ReferencedKeyRIChecker and
034:         * ForeignKeyRICheckers.
035:         */
036:        public class RISetChecker {
037:            private GenericRIChecker[] checkers;
038:
039:            /**
040:             * @param tc		the xact controller
041:             * @param fkInfo	the foreign key information 
042:             *
043:             * @exception StandardException		Thrown on failure
044:             */
045:            public RISetChecker(TransactionController tc, FKInfo fkInfo[])
046:                    throws StandardException {
047:                if (fkInfo == null) {
048:                    return;
049:                }
050:
051:                checkers = new GenericRIChecker[fkInfo.length];
052:
053:                for (int i = 0; i < fkInfo.length; i++) {
054:                    checkers[i] = (fkInfo[i].type == FKInfo.FOREIGN_KEY) ? (GenericRIChecker) new ForeignKeyRIChecker(
055:                            tc, fkInfo[i])
056:                            : (GenericRIChecker) new ReferencedKeyRIChecker(tc,
057:                                    fkInfo[i]);
058:                }
059:            }
060:
061:            /**
062:             * Do any work needed to reopen our ri checkers
063:             * for another round of checks.  Must do a close()
064:             * first.
065:             *
066:             * @exception StandardException on error
067:             */
068:            void reopen() throws StandardException {
069:                // currently a noop
070:            }
071:
072:            /**
073:             * Check that there are no referenced primary keys in
074:             * the passed in row.  So for each foreign key that
075:             * references a primary key constraint, make sure
076:             * that there is no row that matches the values in
077:             * the passed in row.
078:             *
079:             * @param row	the row to check
080:             *
081:             * @exception StandardException on unexpected error, or
082:             *		on a primary/unique key violation
083:             */
084:            public void doPKCheck(ExecRow row, boolean restrictCheckOnly)
085:                    throws StandardException {
086:                if (checkers == null)
087:                    return;
088:
089:                for (int i = 0; i < checkers.length; i++) {
090:                    if (checkers[i] instanceof  ReferencedKeyRIChecker) {
091:                        checkers[i].doCheck(row, restrictCheckOnly);
092:                    }
093:                }
094:            }
095:
096:            /**
097:             * Check that everything in the row is ok, i.e.
098:             * that there are no foreign keys in the passed
099:             * in row that have invalid values.
100:             *
101:             * @param row	the row to check
102:             *
103:             * @exception StandardException on unexpected error, or
104:             *		on a primary/unique key violation
105:             */
106:            public void doFKCheck(ExecRow row) throws StandardException {
107:                if (checkers == null)
108:                    return;
109:
110:                for (int i = 0; i < checkers.length; i++) {
111:                    if (checkers[i] instanceof  ForeignKeyRIChecker) {
112:                        checkers[i].doCheck(row);
113:                    }
114:                }
115:            }
116:
117:            /**
118:             * Execute the specific RI check on the passed in row.
119:             *
120:             * @param index	index into fkInfo
121:             * @param row		the row to check
122:             *
123:             * @exception StandardException on unexpected error, or
124:             *		on a primary/unique key violation
125:             */
126:            public void doRICheck(int index, ExecRow row,
127:                    boolean restrictCheckOnly) throws StandardException {
128:                if (SanityManager.DEBUG) {
129:                    if (checkers == null) {
130:                        SanityManager
131:                                .THROWASSERT("no checkers, how can i execute checker "
132:                                        + index);
133:                    }
134:
135:                    if (index >= checkers.length) {
136:                        SanityManager.THROWASSERT("there are only "
137:                                + checkers.length + " checkers, " + index
138:                                + " is invalid");
139:                    }
140:                }
141:
142:                checkers[index].doCheck(row, restrictCheckOnly);
143:            }
144:
145:            /**
146:             * clean up
147:             *
148:             * @exception StandardException on error
149:             */
150:            public void close() throws StandardException {
151:                if (checkers == null)
152:                    return;
153:
154:                for (int i = 0; i < checkers.length; i++) {
155:                    checkers[i].close();
156:                }
157:            }
158:        }
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