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


001:        /*
002:
003:           Derby - Class org.apache.derby.impl.store.access.UTFQualifier
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.store.access;
023:
024:        import org.apache.derby.iapi.types.DataValueDescriptor;
025:
026:        import org.apache.derby.iapi.store.access.Qualifier;
027:
028:        /**
029:         */
030:        public class UTFQualifier implements  Qualifier {
031:            private UTF value;
032:            private int columnId;
033:
034:            public UTFQualifier(int columnId, String value) {
035:
036:                this .columnId = columnId;
037:                this .value = new UTF(value);
038:            }
039:
040:            /*
041:             ** Qualifier interface
042:             */
043:
044:            /** Get the id of the column to be qualified. **/
045:            public int getColumnId() {
046:                return columnId;
047:            }
048:
049:            /**
050:             * Get the value that the column is to be compared to.
051:             *
052:             * @exception StandardException		Thrown on error
053:             */
054:            public DataValueDescriptor getOrderable() {
055:                return value;
056:            }
057:
058:            /** Get the operator to use in the comparison. 
059:             *
060:             *  @see DataValueDescriptor#compare
061:             **/
062:            public int getOperator() {
063:                return DataValueDescriptor.ORDER_OP_EQUALS;
064:
065:            }
066:
067:            /** 
068:             *  Determine if the result from the compare operation is to be negated.  
069:             *  <p>
070:             *  If true then only rows which fail the compare operation will qualify.
071:             *
072:             *  @see DataValueDescriptor#compare
073:             **/
074:            public boolean negateCompareResult() {
075:                return false;
076:            }
077:
078:            /** 
079:             *  
080:             *  @see Qualifier#getOrderedNulls
081:             **/
082:            public boolean getOrderedNulls() {
083:                return false;
084:            }
085:
086:            /** Get the getOrderedNulls argument to use in the comparison.
087:             *  
088:             *  @see DataValueDescriptor#compare
089:             **/
090:            public boolean getUnknownRV() {
091:                return false;
092:            }
093:
094:            /** Clear the DataValueDescriptor cache, if one exists.
095:             *  (The DataValueDescriptor can be 1 of 3 types:
096:             *		o  VARIANT		  - cannot be cached as its value can 
097:             *							vary within a scan
098:             *		o  SCAN_INVARIANT - can be cached within a scan as its
099:             *							value will not change within a scan
100:             *		o  QUERY_INVARIANT- can be cached across the life of the query
101:             *							as its value will never change
102:             *		o  CONSTANT	      - can be cached across executions
103:             *  
104:             *  @see Qualifier#getUnknownRV
105:             */
106:            public void clearOrderableCache() {
107:            }
108:
109:            /** 
110:             * This method reinitializes all the state of
111:             * the Qualifier.  It is used to distinguish between
112:             * resetting something that is query invariant
113:             * and something that is constant over every
114:             * execution of a query.  Basically, clearOrderableCache()
115:             * will only clear out its cache if it is a VARIANT
116:             * or SCAN_INVARIANT value.  However, each time a
117:             * query is executed, the QUERY_INVARIANT qualifiers need
118:             * to be reset.
119:             */
120:            public void reinitialize() {
121:            }
122:        }
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