| 1 | /** |
| 2 | * Copyright (C) 2006 NetMind Consulting Bt. |
| 3 | * |
| 4 | * This library is free software; you can redistribute it and/or |
| 5 | * modify it under the terms of the GNU Lesser General Public |
| 6 | * License as published by the Free Software Foundation; either |
| 7 | * version 3 of the License, or (at your option) any later version. |
| 8 | * |
| 9 | * This library is distributed in the hope that it will be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU |
| 12 | * Lesser General Public License for more details. |
| 13 | * |
| 14 | * You should have received a copy of the GNU Lesser General Public |
| 15 | * License along with this library; if not, write to the Free Software |
| 16 | * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| 17 | */ |
| 18 | |
| 19 | package hu.netmind.beankeeper.model.impl; |
| 20 | |
| 21 | import java.util.*; |
| 22 | |
| 23 | /** |
| 24 | * Type, class and value conversion methods. |
| 25 | */ |
| 26 | public class TypeUtils |
| 27 | { |
| 28 | /** |
| 29 | * Convert a value of a type to a given target type. |
| 30 | */ |
| 31 | public static Object getTypeValue(Object value, Class attrClass) |
| 32 | { |
| 33 | Class valueClass = null; |
| 34 | // Check if value is null, note that primitive types will |
| 35 | // have a sane default if confronted with null |
| 36 | if ( value == null ) |
| 37 | { |
| 38 | if ( attrClass.equals(byte.class) ) |
| 39 | return new Byte((byte) 0); |
| 40 | else if ( attrClass.equals(double.class) ) |
| 41 | return new Double(0); |
| 42 | else if ( attrClass.equals(float.class) ) |
| 43 | return new Float(0); |
| 44 | else if ( attrClass.equals(int.class) ) |
| 45 | return new Integer(0); |
| 46 | else if ( attrClass.equals(long.class) ) |
| 47 | return new Long(0); |
| 48 | else if ( attrClass.equals(short.class) ) |
| 49 | return new Short((short) 0); |
| 50 | else if ( attrClass.equals(boolean.class) ) |
| 51 | return new Boolean(false); |
| 52 | else if ( attrClass.equals(char.class) ) |
| 53 | return new Character('\u0000'); |
| 54 | return null; |
| 55 | } |
| 56 | valueClass = value.getClass(); |
| 57 | // Handle primitive types with exceptional circumstances |
| 58 | if ( (attrClass.equals(Character.class)) || (attrClass.equals(char.class)) |
| 59 | && (valueClass.equals(String.class)) ) |
| 60 | { |
| 61 | if ( ((String) value).length() > 0 ) |
| 62 | return new Character(((String) value).charAt(0)); |
| 63 | } |
| 64 | // Byte array |
| 65 | else if ( attrClass.equals(byte[].class) ) |
| 66 | return value; |
| 67 | // Boolean |
| 68 | else if ( (attrClass.equals(Boolean.class) || attrClass.equals(boolean.class)) |
| 69 | && ((valueClass.equals(Integer.class)) || |
| 70 | (valueClass.equals(Long.class))) ) |
| 71 | { |
| 72 | return new Boolean(((Number) value).intValue() > 0); |
| 73 | } |
| 74 | // Easy primitive classes |
| 75 | else if ( valueClass.equals(String.class) || |
| 76 | valueClass.equals(Date.class) || |
| 77 | valueClass.equals(Boolean.class) |
| 78 | ) |
| 79 | return value; |
| 80 | // Container classes |
| 81 | else if ( (value instanceof Map) || (value instanceof List) ) |
| 82 | return value; |
| 83 | // Not easy number classes |
| 84 | else if ( value instanceof Number ) |
| 85 | { |
| 86 | Number number = (Number) value; |
| 87 | if ( attrClass.equals(Byte.class) || attrClass.equals(byte.class) ) |
| 88 | return new Byte(number.byteValue()); |
| 89 | if ( attrClass.equals(Double.class) || attrClass.equals(double.class) ) |
| 90 | return new Double(number.doubleValue()); |
| 91 | if ( attrClass.equals(Float.class) || attrClass.equals(float.class) ) |
| 92 | return new Float(number.floatValue()); |
| 93 | if ( attrClass.equals(Integer.class) || attrClass.equals(int.class) ) |
| 94 | return new Integer(number.intValue()); |
| 95 | if ( attrClass.equals(Long.class) || attrClass.equals(long.class) ) |
| 96 | return new Long(number.longValue()); |
| 97 | if ( attrClass.equals(Short.class) || attrClass.equals(short.class) ) |
| 98 | return new Short(number.shortValue()); |
| 99 | } |
| 100 | // All other objects |
| 101 | return value; |
| 102 | } |
| 103 | |
| 104 | } |