| Classes in this File | Line Coverage | Branch Coverage | Complexity | ||||
| IntrospectionUtils |
|
| 10.25;10.25 |
| 1 | /* | |
| 2 | * Copyright (C) 1998-2000 Semiotek Inc. All Rights Reserved. | |
| 3 | * | |
| 4 | * Redistribution and use in source and binary forms, with or without | |
| 5 | * modification, are permitted under the terms of either of the following | |
| 6 | * Open Source licenses: | |
| 7 | * | |
| 8 | * The GNU General Public License, version 2, or any later version, as | |
| 9 | * published by the Free Software Foundation | |
| 10 | * (http://www.fsf.org/copyleft/gpl.html); | |
| 11 | * | |
| 12 | * or | |
| 13 | * | |
| 14 | * The Semiotek Public License (http://webmacro.org/LICENSE.) | |
| 15 | * | |
| 16 | * This software is provided "as is", with NO WARRANTY, not even the | |
| 17 | * implied warranties of fitness to purpose, or merchantability. You | |
| 18 | * assume all risks and liabilities associated with its use. | |
| 19 | * | |
| 20 | * See www.webmacro.org for more information on the WebMacro project. | |
| 21 | */ | |
| 22 | package org.webmacro.engine; | |
| 23 | ||
| 24 | /** | |
| 25 | * | |
| 26 | * @author Keats | |
| 27 | * @since May 25, 2002 | |
| 28 | */ | |
| 29 | public final class IntrospectionUtils | |
| 30 | { | |
| 31 | ||
| 32 | /** Deny instantiation */ | |
| 33 | private IntrospectionUtils () | |
| 34 | 0 | { |
| 35 | 0 | } |
| 36 | ||
| 37 | static boolean matches (Class[] sig, Class[] args) | |
| 38 | { | |
| 39 | 93112 | if (args.length != sig.length) |
| 40 | 9870 | return false; |
| 41 | ||
| 42 | try | |
| 43 | { | |
| 44 | 145388 | for (int i = 0; i < sig.length; i++) |
| 45 | { | |
| 46 | 64620 | Class s = sig[i]; |
| 47 | 64620 | Class a = args[i]; |
| 48 | 64620 | if (s.isPrimitive()) |
| 49 | { | |
| 50 | 64 | if ((s == Integer.TYPE && a == Integer.class) || |
| 51 | (s == Boolean.TYPE && a == Boolean.class) || | |
| 52 | (s == Character.TYPE && a == Character.class) || | |
| 53 | (s == Long.TYPE && a == Long.class) || | |
| 54 | (s == Short.TYPE && a == Short.class) || | |
| 55 | (s == Double.TYPE && a == Double.class) || | |
| 56 | (s == Float.TYPE && a == Float.class) || | |
| 57 | (s == Void.TYPE && a == Void.class) || | |
| 58 | (s == Byte.TYPE && a == Byte.class)) | |
| 59 | 0 | continue; |
| 60 | else | |
| 61 | 48 | return false; |
| 62 | } | |
| 63 | 64556 | else if (a == null || s.isAssignableFrom(a)) |
| 64 | 62078 | continue; |
| 65 | else | |
| 66 | 2426 | return false; |
| 67 | } | |
| 68 | } | |
| 69 | 0 | catch (NullPointerException e) |
| 70 | { | |
| 71 | 0 | return false; // XXX: block nulls, isAssignableFrom throws this |
| 72 | 80768 | } |
| 73 | 80768 | return true; |
| 74 | } | |
| 75 | ||
| 76 | static public Class[] createTypesFromArgs (Object[] args) | |
| 77 | { | |
| 78 | 0 | Class[] types = new Class[args.length]; |
| 79 | 0 | for (int i = 0; i < args.length; i++) |
| 80 | { | |
| 81 | try | |
| 82 | { | |
| 83 | 0 | types[i] = args[i].getClass(); |
| 84 | } | |
| 85 | 0 | catch (NullPointerException e) |
| 86 | { | |
| 87 | 0 | types[i] = null; |
| 88 | 0 | } |
| 89 | } | |
| 90 | 0 | return types; |
| 91 | } | |
| 92 | ||
| 93 | /** Attempt to instantiate a class with the supplied args. */ | |
| 94 | static public Object instantiate (Class c, Object[] args) | |
| 95 | throws Exception | |
| 96 | { | |
| 97 | 0 | Object o = null; |
| 98 | 0 | if (args == null || args.length == 0) |
| 99 | { | |
| 100 | 0 | o = c.newInstance(); // no arg constructor |
| 101 | } | |
| 102 | else | |
| 103 | { | |
| 104 | // try each constructor with the right number of args, | |
| 105 | // until one works or all have failed | |
| 106 | 0 | java.lang.reflect.Constructor[] cons = c.getConstructors(); |
| 107 | 0 | for (int i = 0; i < cons.length; i++) |
| 108 | { | |
| 109 | 0 | if (cons[i].getParameterTypes().length == args.length) |
| 110 | { | |
| 111 | // try to instantiate using this constructor | |
| 112 | try | |
| 113 | { | |
| 114 | 0 | o = cons[i].newInstance(args); |
| 115 | 0 | break; // if successful, we're done! |
| 116 | } | |
| 117 | 0 | catch (Exception e) |
| 118 | { | |
| 119 | // ignore this failure, try the next one | |
| 120 | } | |
| 121 | } | |
| 122 | } | |
| 123 | 0 | if (o == null) |
| 124 | { | |
| 125 | 0 | throw new InstantiationException( |
| 126 | "Unable to construct object of type " + c.getName() | |
| 127 | + " using the supplied arguments: " | |
| 128 | + java.util.Arrays.asList(args).toString()); | |
| 129 | } | |
| 130 | } | |
| 131 | 0 | return o; |
| 132 | } | |
| 133 | } |