| 1 | /* ============================================================= |
| 2 | * SmallSQL : a free Java DBMS library for the Java(tm) platform |
| 3 | * ============================================================= |
| 4 | * |
| 5 | * (C) Copyright 2004-2006, by Volker Berlin. |
| 6 | * |
| 7 | * Project Info: http://www.smallsql.de/ |
| 8 | * |
| 9 | * This library is free software; you can redistribute it and/or modify it |
| 10 | * under the terms of the GNU Lesser General Public License as published by |
| 11 | * the Free Software Foundation; either version 2.1 of the License, or |
| 12 | * (at your option) any later version. |
| 13 | * |
| 14 | * This library is distributed in the hope that it will be useful, but |
| 15 | * WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY |
| 16 | * or FITNESS FOR A PARTICULAR PURPOSE. See the GNU Lesser General Public |
| 17 | * License for more details. |
| 18 | * |
| 19 | * You should have received a copy of the GNU Lesser General Public |
| 20 | * License along with this library; if not, write to the Free Software |
| 21 | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, |
| 22 | * USA. |
| 23 | * |
| 24 | * [Java is a trademark or registered trademark of Sun Microsystems, Inc. |
| 25 | * in the United States and other countries.] |
| 26 | * |
| 27 | * --------------- |
| 28 | * ExpressionFunctionReturnP1.java |
| 29 | * --------------- |
| 30 | * Author: Volker Berlin |
| 31 | * |
| 32 | * Created on 23.01.2005 |
| 33 | */ |
| 34 | package smallsql.database; |
| 35 | |
| 36 | /** |
| 37 | * Super Class for functions which extends the metadata from the first parameter. |
| 38 | * @author Volker Berlin |
| 39 | */ |
| 40 | abstract class ExpressionFunctionReturnP1 extends ExpressionFunction { |
| 41 | |
| 42 | |
| 43 | boolean isNull() throws Exception{ |
| 44 | return param1.isNull(); |
| 45 | } |
| 46 | |
| 47 | |
| 48 | Object getObject() throws Exception{ |
| 49 | if(isNull()) return null; |
| 50 | int dataType = getDataType(); |
| 51 | switch(dataType){ |
| 52 | case SQLTokenizer.BIT: |
| 53 | case SQLTokenizer.BOOLEAN: |
| 54 | return getBoolean() ? Boolean.TRUE : Boolean.FALSE; |
| 55 | case SQLTokenizer.BINARY: |
| 56 | case SQLTokenizer.VARBINARY: |
| 57 | return getBytes(); |
| 58 | case SQLTokenizer.TINYINT: |
| 59 | case SQLTokenizer.SMALLINT: |
| 60 | case SQLTokenizer.INT: |
| 61 | return new Integer( getInt() ); |
| 62 | case SQLTokenizer.BIGINT: |
| 63 | return new Long( getLong() ); |
| 64 | case SQLTokenizer.REAL: |
| 65 | return new Float( getFloat() ); |
| 66 | case SQLTokenizer.FLOAT: |
| 67 | case SQLTokenizer.DOUBLE: |
| 68 | return new Double( getDouble() ); |
| 69 | case SQLTokenizer.MONEY: |
| 70 | case SQLTokenizer.SMALLMONEY: |
| 71 | return Money.createFromUnscaledValue( getMoney() ); |
| 72 | case SQLTokenizer.NUMERIC: |
| 73 | case SQLTokenizer.DECIMAL: |
| 74 | return getNumeric(); |
| 75 | case SQLTokenizer.CHAR: |
| 76 | case SQLTokenizer.NCHAR: |
| 77 | case SQLTokenizer.VARCHAR: |
| 78 | case SQLTokenizer.NVARCHAR: |
| 79 | case SQLTokenizer.LONGNVARCHAR: |
| 80 | case SQLTokenizer.LONGVARCHAR: |
| 81 | return getString(); |
| 82 | case SQLTokenizer.LONGVARBINARY: |
| 83 | return getBytes(); |
| 84 | case SQLTokenizer.DATE: |
| 85 | case SQLTokenizer.TIME: |
| 86 | case SQLTokenizer.TIMESTAMP: |
| 87 | case SQLTokenizer.SMALLDATETIME: |
| 88 | return new DateTime( getLong(), dataType ); |
| 89 | case SQLTokenizer.UNIQUEIDENTIFIER: |
| 90 | return getBytes(); |
| 91 | default: throw createUnspportedDataType(param1.getDataType()); |
| 92 | } |
| 93 | } |
| 94 | |
| 95 | |
| 96 | int getDataType() { |
| 97 | return param1.getDataType(); |
| 98 | } |
| 99 | |
| 100 | |
| 101 | int getPrecision() { |
| 102 | return param1.getPrecision(); |
| 103 | } |
| 104 | |
| 105 | |
| 106 | final int getScale(){ |
| 107 | return param1.getScale(); |
| 108 | } |
| 109 | } |