Source Code Cross Referenced for UnaryLogicalOperatorNode.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.UnaryLogicalOperatorNode
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.sql.dictionary.DataDictionary;
025:
026:        import org.apache.derby.iapi.types.TypeId;
027:
028:        import org.apache.derby.iapi.reference.SQLState;
029:        import org.apache.derby.iapi.error.StandardException;
030:        import org.apache.derby.iapi.types.DataTypeDescriptor;
031:
032:        import org.apache.derby.iapi.services.sanity.SanityManager;
033:
034:        import java.util.Vector;
035:
036:        public abstract class UnaryLogicalOperatorNode extends
037:                UnaryOperatorNode {
038:            /**
039:             * Initializer for a UnaryLogicalOperatorNode
040:             *
041:             * @param operand	The operand of the operator
042:             * @param methodName	The name of the method to call in the generated
043:             *						class.  In this case, it's actually an operator
044:             *						name.
045:             */
046:
047:            public void init(Object operand, Object methodName) {
048:                /* For logical operators, the operator and method names are the same */
049:                super .init(operand, methodName, methodName);
050:            }
051:
052:            /**
053:             * Bind this logical operator.  All that has to be done for binding
054:             * a logical operator is to bind the operand, check that the operand
055:             * is SQLBoolean, and set the result type to SQLBoolean.
056:             *
057:             * @param fromList			The query's FROM list
058:             * @param subqueryList		The subquery list being built as we find SubqueryNodes
059:             * @param aggregateVector	The aggregate vector being built as we find AggregateNodes
060:             *
061:             * @return	The new top of the expression tree.
062:             *
063:             * @exception StandardException		Thrown on error
064:             */
065:
066:            public ValueNode bindExpression(FromList fromList,
067:                    SubqueryList subqueryList, Vector aggregateVector)
068:                    throws StandardException {
069:                super .bindExpression(fromList, subqueryList, aggregateVector);
070:
071:                /*
072:                 ** Logical operators work only on booleans.  If the operand 
073:                 ** is not boolean, throw an exception.
074:                 **
075:                 ** For now, this exception will never happen, because the grammar
076:                 ** does not allow arbitrary expressions with NOT.  But when
077:                 ** we start allowing generalized boolean expressions, we will modify
078:                 ** the grammar, so this test will become useful.
079:                 */
080:
081:                if (!operand.getTypeServices().getTypeId().equals(
082:                        TypeId.BOOLEAN_ID)) {
083:                    operand.treePrint();
084:                    throw StandardException
085:                            .newException(SQLState.LANG_UNARY_LOGICAL_NON_BOOLEAN);
086:                }
087:
088:                /* Set the type info */
089:                setFullTypeInfo();
090:
091:                return this ;
092:            }
093:
094:            /**
095:             * Set all of the type info (nullability and DataTypeServices) for
096:             * this node.  Extracts out tasks that must be done by both bind()
097:             * and post-bind() AndNode generation.
098:             *
099:             * @exception StandardException		Thrown on error
100:             */
101:            protected void setFullTypeInfo() throws StandardException {
102:                boolean nullableResult;
103:
104:                /*
105:                 ** Set the result type of this comparison operator based on the
106:                 ** operands.  The result type is always SQLBoolean - the only question
107:                 ** is whether it is nullable or not.  If either of the operands is
108:                 ** nullable, the result of the comparison must be nullable, too, so
109:                 ** we can represent the unknown truth value.
110:                 */
111:                nullableResult = operand.getTypeServices().isNullable();
112:                setType(new DataTypeDescriptor(TypeId.BOOLEAN_ID,
113:                        nullableResult));
114:            }
115:        }
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