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1
22
23
24 package com.mchange.v2.lang;
25
26 import java.util.*;
27
28 public final class Coerce
29 {
30 final static Set CAN_COERCE;
31
32 static
33 {
34 Class  [] classes =
35 {
36 byte.class,
37 boolean.class,
38 char.class,
39 short.class,
40 int.class,
41 long.class,
42 float.class,
43 double.class,
44 String .class,
45 Byte .class,
46 Boolean .class,
47 Character .class,
48 Short .class,
49 Integer .class,
50 Long .class,
51 Float .class,
52 Double .class
53 };
54 Set tmp = new HashSet();
55 tmp.addAll( Arrays.asList( classes ) );
56 CAN_COERCE = Collections.unmodifiableSet( tmp );
57 }
58
59 public static boolean canCoerce( Class cl )
60 { return CAN_COERCE.contains( cl ); }
61
62 public static boolean canCoerce( Object o )
63 { return canCoerce( o.getClass() ); }
64
65 public static int toInt( String s )
66 {
67 try { return Integer.parseInt( s ); }
68 catch ( NumberFormatException e )
69 { return (int) Double.parseDouble( s ); }
70 }
71
72 public static long toLong( String s )
73 {
74 try { return Long.parseLong( s ); }
75 catch ( NumberFormatException e )
76 { return (long) Double.parseDouble( s ); }
77 }
78
79 public static float toFloat( String s )
80 { return Float.parseFloat( s ); }
81
82 public static double toDouble( String s )
83 { return Double.parseDouble( s ); }
84
85 public static byte toByte( String s )
86 { return (byte) toInt(s); }
87
88 public static short toShort( String s )
89 { return (short) toInt(s); }
90
91 public static boolean toBoolean( String s )
92 { return Boolean.valueOf( s ).booleanValue(); }
93
94 public static char toChar( String s )
95 {
96 s = s.trim();
97 if (s.length() == 1)
98 return s.charAt( 0 );
99 else
100 return (char) toInt(s);
101 }
102
103 public static Object toObject( String s, Class type )
104 {
105 if ( type == byte.class) type = Byte .class;
106 else if ( type == boolean.class) type = Boolean .class;
107 else if ( type == char.class) type = Character .class;
108 else if ( type == short.class) type = Short .class;
109 else if ( type == int.class) type = Integer .class;
110 else if ( type == long.class) type = Long .class;
111 else if ( type == float.class) type = Float .class;
112 else if ( type == double.class) type = Double .class;
113
114 if ( type == String .class )
115 return s;
116 else if ( type == Byte .class )
117 return new Byte ( toByte( s ) );
118 else if ( type == Boolean .class )
119 return Boolean.valueOf( s );
120 else if ( type == Character .class )
121 return new Character ( toChar( s ) );
122 else if ( type == Short .class )
123 return new Short ( toShort( s ) );
124 else if ( type == Integer .class )
125 return new Integer ( s );
126 else if ( type == Long .class )
127 return new Long ( s );
128 else if ( type == Float .class )
129 return new Float ( s );
130 else if ( type == Double .class )
131 return new Double ( s );
132 else
133 throw new IllegalArgumentException ("Cannot coerce to type: " + type.getName());
134 }
135
136 private Coerce()
137 {}
138 }
139 |
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