Source Code Cross Referenced for TimestampOperatorNode.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.TimestampOperatorNode
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.types.TypeId;
025:        import org.apache.derby.iapi.types.DataValueFactory;
026:        import org.apache.derby.iapi.types.DataTypeDescriptor;
027:        import org.apache.derby.iapi.services.compiler.MethodBuilder;
028:        import org.apache.derby.iapi.error.StandardException;
029:
030:        import org.apache.derby.impl.sql.compile.ExpressionClassBuilder;
031:
032:        import org.apache.derby.iapi.reference.ClassName;
033:        import org.apache.derby.iapi.reference.SQLState;
034:
035:        import org.apache.derby.iapi.services.classfile.VMOpcode;
036:
037:        import java.sql.Types;
038:
039:        import java.util.Vector;
040:
041:        /**
042:         * The TimestampOperatorNode class implements the timestamp( date, time) function.
043:         */
044:
045:        public class TimestampOperatorNode extends BinaryOperatorNode {
046:
047:            /**
048:             * Initailizer for a TimestampOperatorNode.
049:             *
050:             * @param date The date
051:             * @param time The time
052:             */
053:
054:            public void init(Object date, Object time) {
055:                leftOperand = (ValueNode) date;
056:                rightOperand = (ValueNode) time;
057:                operator = "timestamp";
058:                methodName = "getTimestamp";
059:            }
060:
061:            /**
062:             * Bind this expression.  This means binding the sub-expressions,
063:             * as well as figuring out what the return type is for this expression.
064:             *
065:             * @param fromList		The FROM list for the query this
066:             *				expression is in, for binding columns.
067:             * @param subqueryList		The subquery list being built as we find SubqueryNodes
068:             * @param aggregateVector	The aggregate vector being built as we find AggregateNodes
069:             *
070:             * @return	The new top of the expression tree.
071:             *
072:             * @exception StandardException		Thrown on error
073:             */
074:
075:            public ValueNode bindExpression(FromList fromList,
076:                    SubqueryList subqueryList, Vector aggregateVector)
077:                    throws StandardException {
078:                leftOperand = leftOperand.bindExpression(fromList,
079:                        subqueryList, aggregateVector);
080:                rightOperand = rightOperand.bindExpression(fromList,
081:                        subqueryList, aggregateVector);
082:
083:                //Set the type if there is a parameter involved here 
084:                if (leftOperand.requiresTypeFromContext())
085:                    leftOperand.setType(DataTypeDescriptor
086:                            .getBuiltInDataTypeDescriptor(Types.DATE));
087:                //Set the type if there is a parameter involved here 
088:                if (rightOperand.requiresTypeFromContext())
089:                    rightOperand.setType(DataTypeDescriptor
090:                            .getBuiltInDataTypeDescriptor(Types.TIME));
091:
092:                TypeId leftTypeId = leftOperand.getTypeId();
093:                TypeId rightTypeId = rightOperand.getTypeId();
094:                if (!(leftOperand.requiresTypeFromContext()
095:                        || leftTypeId.isStringTypeId() || leftTypeId
096:                        .getJDBCTypeId() == Types.DATE))
097:                    throw StandardException.newException(
098:                            SQLState.LANG_BINARY_OPERATOR_NOT_SUPPORTED,
099:                            operator, leftTypeId.getSQLTypeName(), rightTypeId
100:                                    .getSQLTypeName());
101:                if (!(rightOperand.requiresTypeFromContext()
102:                        || rightTypeId.isStringTypeId() || rightTypeId
103:                        .getJDBCTypeId() == Types.TIME))
104:                    throw StandardException.newException(
105:                            SQLState.LANG_BINARY_OPERATOR_NOT_SUPPORTED,
106:                            operator, leftTypeId.getSQLTypeName(), rightTypeId
107:                                    .getSQLTypeName());
108:                setType(DataTypeDescriptor
109:                        .getBuiltInDataTypeDescriptor(Types.TIMESTAMP));
110:                return genSQLJavaSQLTree();
111:            } // end of bindExpression
112:
113:            /**
114:             * Do code generation for this binary operator.
115:             *
116:             * @param acb	The ExpressionClassBuilder for the class we're generating
117:             * @param mb	The method the code to place the code
118:             *
119:             *
120:             * @exception StandardException		Thrown on error
121:             */
122:
123:            public void generateExpression(ExpressionClassBuilder acb,
124:                    MethodBuilder mb) throws StandardException {
125:                acb.pushDataValueFactory(mb);
126:                leftOperand.generateExpression(acb, mb);
127:                mb.cast(ClassName.DataValueDescriptor);
128:                rightOperand.generateExpression(acb, mb);
129:                mb.cast(ClassName.DataValueDescriptor);
130:                mb.callMethod(VMOpcode.INVOKEINTERFACE, null, methodName,
131:                        ClassName.DateTimeDataValue, 2);
132:            } // end of generateExpression
133:        }
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