--- /dev/null
+/*\r
+\r
+ Derby - Class org.apache.derby.impl.sql.compile.ExtractOperatorNode\r
+\r
+ Licensed to the Apache Software Foundation (ASF) under one or more\r
+ contributor license agreements. See the NOTICE file distributed with\r
+ this work for additional information regarding copyright ownership.\r
+ The ASF licenses this file to you under the Apache License, Version 2.0\r
+ (the "License"); you may not use this file except in compliance with\r
+ the License. You may obtain a copy of the License at\r
+\r
+ http://www.apache.org/licenses/LICENSE-2.0\r
+\r
+ Unless required by applicable law or agreed to in writing, software\r
+ distributed under the License is distributed on an "AS IS" BASIS,\r
+ WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.\r
+ See the License for the specific language governing permissions and\r
+ limitations under the License.\r
+\r
+ */\r
+\r
+package org.apache.derby.impl.sql.compile;\r
+\r
+import org.apache.derby.iapi.sql.compile.C_NodeTypes;\r
+\r
+import org.apache.derby.iapi.sql.dictionary.DataDictionary;\r
+\r
+import org.apache.derby.iapi.types.TypeId;\r
+import org.apache.derby.iapi.types.DateTimeDataValue;\r
+import org.apache.derby.iapi.types.DataTypeDescriptor;\r
+\r
+import org.apache.derby.iapi.sql.compile.TypeCompiler;\r
+\r
+import org.apache.derby.iapi.reference.SQLState;\r
+import org.apache.derby.iapi.error.StandardException;\r
+\r
+import org.apache.derby.iapi.services.sanity.SanityManager;\r
+\r
+import java.sql.Types;\r
+\r
+import java.util.Vector;\r
+\r
+/**\r
+ * This node represents a unary extract operator, used to extract\r
+ * a field from a date/time. The field value is returned as an integer.\r
+ *\r
+ */\r
+public class ExtractOperatorNode extends UnaryOperatorNode {\r
+\r
+ static private final String fieldName[] = {\r
+ "YEAR", "MONTH", "DAY", "HOUR", "MINUTE", "SECOND"\r
+ };\r
+ static private final String fieldMethod[] = {\r
+ "getYear","getMonth","getDate","getHours","getMinutes","getSeconds"\r
+ };\r
+\r
+ private int extractField;\r
+\r
+ /**\r
+ * Initializer for a ExtractOperatorNode\r
+ *\r
+ * @param field The field to extract\r
+ * @param operand The operand\r
+ */\r
+ public void init(Object field, Object operand) {\r
+ extractField = ((Integer) field).intValue();\r
+ super.init( operand,\r
+ "EXTRACT "+fieldName[extractField],\r
+ fieldMethod[extractField] );\r
+ }\r
+\r
+ /**\r
+ * Bind this operator\r
+ *\r
+ * @param fromList The query's FROM list\r
+ * @param subqueryList The subquery list being built as we find SubqueryNodes\r
+ * @param aggregateVector The aggregate vector being built as we find AggregateNodes\r
+ *\r
+ * @return The new top of the expression tree.\r
+ *\r
+ * @exception StandardException Thrown on error\r
+ */\r
+\r
+ public ValueNode bindExpression(\r
+ FromList fromList, \r
+ SubqueryList subqueryList,\r
+ Vector aggregateVector)\r
+ throws StandardException \r
+ {\r
+ int operandType;\r
+ TypeId opTypeId;\r
+\r
+ bindOperand(fromList, subqueryList,\r
+ aggregateVector);\r
+\r
+ opTypeId = operand.getTypeId();\r
+ operandType = opTypeId.getJDBCTypeId();\r
+ TypeCompiler tc = operand.getTypeCompiler();\r
+\r
+ /*\r
+ ** Cast the operand, if necessary, - this function is allowed only on\r
+ ** date/time types. By default, we cast to DATE if extracting\r
+ ** YEAR, MONTH or DAY and to TIME if extracting HOUR, MINUTE or\r
+ ** SECOND.\r
+ */\r
+ if (opTypeId.isStringTypeId())\r
+ {\r
+ int castType = (extractField < 3) ? Types.DATE : Types.TIME;\r
+ operand = (ValueNode)\r
+ getNodeFactory().getNode(\r
+ C_NodeTypes.CAST_NODE,\r
+ operand, \r
+ DataTypeDescriptor.getBuiltInDataTypeDescriptor(castType, true, \r
+ tc.getCastToCharWidth(\r
+ operand.getTypeServices())),\r
+ getContextManager());\r
+ ((CastNode) operand).bindCastNodeOnly();\r
+\r
+ opTypeId = operand.getTypeId();\r
+ operandType = opTypeId.getJDBCTypeId();\r
+ }\r
+\r
+ if ( ! ( ( operandType == Types.DATE )\r
+ || ( operandType == Types.TIME ) \r
+ || ( operandType == Types.TIMESTAMP ) \r
+ ) ) {\r
+ throw StandardException.newException(SQLState.LANG_UNARY_FUNCTION_BAD_TYPE, \r
+ "EXTRACT "+fieldName[extractField],\r
+ opTypeId.getSQLTypeName());\r
+ }\r
+\r
+ /*\r
+ If the type is DATE, ensure the field is okay.\r
+ */\r
+ if ( (operandType == Types.DATE) \r
+ && (extractField > DateTimeDataValue.DAY_FIELD) ) {\r
+ throw StandardException.newException(SQLState.LANG_UNARY_FUNCTION_BAD_TYPE, \r
+ "EXTRACT "+fieldName[extractField],\r
+ opTypeId.getSQLTypeName());\r
+ }\r
+\r
+ /*\r
+ If the type is TIME, ensure the field is okay.\r
+ */\r
+ if ( (operandType == Types.TIME) \r
+ && (extractField < DateTimeDataValue.HOUR_FIELD) ) {\r
+ throw StandardException.newException(SQLState.LANG_UNARY_FUNCTION_BAD_TYPE, \r
+ "EXTRACT "+fieldName[extractField],\r
+ opTypeId.getSQLTypeName());\r
+ }\r
+\r
+ /*\r
+ ** The result type of extract is int,\r
+ ** unless it is TIMESTAMP and SECOND, in which case\r
+ ** for now it is DOUBLE but eventually it will need to\r
+ ** be DECIMAL(11,9).\r
+ */\r
+ if ( (operandType == Types.TIMESTAMP)\r
+ && (extractField == DateTimeDataValue.SECOND_FIELD) ) {\r
+ setType(new DataTypeDescriptor(\r
+ TypeId.getBuiltInTypeId(Types.DOUBLE),\r
+ operand.getTypeServices().isNullable()\r
+ )\r
+ );\r
+ } else {\r
+ setType(new DataTypeDescriptor(\r
+ TypeId.INTEGER_ID,\r
+ operand.getTypeServices().isNullable()\r
+ )\r
+ );\r
+ }\r
+\r
+ return this;\r
+ }\r
+\r
+ public String toString() {\r
+ if (SanityManager.DEBUG)\r
+ {\r
+ return super.toString() + "field is "+fieldName[extractField]+"\n";\r
+ }\r
+ else\r
+ {\r
+ return "";\r
+ }\r
+ }\r
+}\r
projects / Benchmarks_CSolver.git / blobdiff