| 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 | * ExpressionFunctionAbs.java |
| 29 | * --------------- |
| 30 | * Author: Volker Berlin |
| 31 | * |
| 32 | */ |
| 33 | package smallsql.database; |
| 34 | |
| 35 | |
| 36 | class ExpressionFunctionAbs extends ExpressionFunctionReturnP1 { |
| 37 | |
| 38 | int getFunction(){ return SQLTokenizer.ABS; } |
| 39 | |
| 40 | |
| 41 | boolean getBoolean() throws Exception{ |
| 42 | return getDouble() != 0; |
| 43 | } |
| 44 | |
| 45 | int getInt() throws Exception{ |
| 46 | return Math.abs( param1.getInt() ); |
| 47 | } |
| 48 | |
| 49 | long getLong() throws Exception{ |
| 50 | return Math.abs( param1.getLong() ); |
| 51 | } |
| 52 | |
| 53 | float getFloat() throws Exception{ |
| 54 | return Math.abs( param1.getFloat() ); |
| 55 | } |
| 56 | |
| 57 | double getDouble() throws Exception{ |
| 58 | return Math.abs( param1.getDouble() ); |
| 59 | } |
| 60 | |
| 61 | long getMoney() throws Exception{ |
| 62 | return Math.abs( param1.getMoney() ); |
| 63 | } |
| 64 | |
| 65 | MutableNumeric getNumeric() throws Exception{ |
| 66 | if(param1.isNull()) return null; |
| 67 | MutableNumeric num = param1.getNumeric(); |
| 68 | if(num.signum < 0) num.signum = 1; |
| 69 | return num; |
| 70 | } |
| 71 | |
| 72 | Object getObject() throws Exception{ |
| 73 | if(param1.isNull()) return null; |
| 74 | Object para1 = param1.getObject(); |
| 75 | switch(param1.getDataType()){ |
| 76 | case SQLTokenizer.FLOAT: |
| 77 | case SQLTokenizer.DOUBLE: |
| 78 | double dValue = ((Double)para1).doubleValue(); |
| 79 | return (dValue<0) ? new Double(-dValue) : para1; |
| 80 | case SQLTokenizer.REAL: |
| 81 | double fValue = ((Float)para1).floatValue(); |
| 82 | return (fValue<0) ? new Float(-fValue) : para1; |
| 83 | case SQLTokenizer.BIGINT: |
| 84 | long lValue = ((Number)para1).longValue(); |
| 85 | return (lValue<0) ? new Long(-lValue) : para1; |
| 86 | case SQLTokenizer.TINYINT: |
| 87 | case SQLTokenizer.SMALLINT: |
| 88 | case SQLTokenizer.INT: |
| 89 | int iValue = ((Number)para1).intValue(); |
| 90 | return (iValue<0) ? new Integer(-iValue) : para1; |
| 91 | case SQLTokenizer.NUMERIC: |
| 92 | case SQLTokenizer.DECIMAL: |
| 93 | MutableNumeric nValue = (MutableNumeric)para1; |
| 94 | if(nValue.signum <0) nValue.signum = 1; |
| 95 | return nValue; |
| 96 | case SQLTokenizer.MONEY: |
| 97 | Money mValue = (Money)para1; |
| 98 | if(mValue.value <0) mValue.value = -mValue.value; |
| 99 | return mValue; |
| 100 | default: throw createUnspportedDataType(param1.getDataType()); |
| 101 | } |
| 102 | } |
| 103 | |
| 104 | String getString() throws Exception{ |
| 105 | Object obj = getObject(); |
| 106 | if(obj == null) return null; |
| 107 | return obj.toString(); |
| 108 | } |
| 109 | |
| 110 | |
| 111 | } |