J. Duke | 319a3b9 | 2007-12-01 00:00:00 +0000 | [diff] [blame^] | 1 | /* |
| 2 | * Copyright 2004 Sun Microsystems, Inc. All Rights Reserved. |
| 3 | * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER. |
| 4 | * |
| 5 | * This code is free software; you can redistribute it and/or modify it |
| 6 | * under the terms of the GNU General Public License version 2 only, as |
| 7 | * published by the Free Software Foundation. |
| 8 | * |
| 9 | * This code is distributed in the hope that it will be useful, but WITHOUT |
| 10 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| 11 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License |
| 12 | * version 2 for more details (a copy is included in the LICENSE file that |
| 13 | * accompanied this code). |
| 14 | * |
| 15 | * You should have received a copy of the GNU General Public License version |
| 16 | * 2 along with this work; if not, write to the Free Software Foundation, |
| 17 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. |
| 18 | * |
| 19 | * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara, |
| 20 | * CA 95054 USA or visit www.sun.com if you need additional information or |
| 21 | * have any questions. |
| 22 | */ |
| 23 | |
| 24 | /* |
| 25 | * @bug 5024531 |
| 26 | * @summary Utility class to convert a struct-like class to a CompositeData. |
| 27 | * @author Mandy Chung |
| 28 | */ |
| 29 | |
| 30 | import java.lang.reflect.*; |
| 31 | import java.util.*; |
| 32 | import javax.management.*; |
| 33 | import javax.management.openmbean.*; |
| 34 | import static javax.management.openmbean.SimpleType.*; |
| 35 | |
| 36 | /** |
| 37 | * A converter utiltiy class to automatically convert a given |
| 38 | * class to a CompositeType. |
| 39 | */ |
| 40 | public class OpenTypeConverter { |
| 41 | private static final WeakHashMap<Class,OpenType> convertedTypes = |
| 42 | new WeakHashMap<Class,OpenType>(); |
| 43 | private static final OpenType[] simpleTypes = { |
| 44 | BIGDECIMAL, BIGINTEGER, BOOLEAN, BYTE, CHARACTER, DATE, |
| 45 | DOUBLE, FLOAT, INTEGER, LONG, OBJECTNAME, SHORT, STRING, |
| 46 | VOID, |
| 47 | }; |
| 48 | |
| 49 | static { |
| 50 | for (int i = 0; i < simpleTypes.length; i++) { |
| 51 | final OpenType t = simpleTypes[i]; |
| 52 | Class c; |
| 53 | try { |
| 54 | c = Class.forName(t.getClassName(), false, |
| 55 | String.class.getClassLoader()); |
| 56 | } catch (ClassNotFoundException e) { |
| 57 | // the classes that these predefined types declare must exist! |
| 58 | assert(false); |
| 59 | c = null; // not reached |
| 60 | } |
| 61 | convertedTypes.put(c, t); |
| 62 | |
| 63 | if (c.getName().startsWith("java.lang.")) { |
| 64 | try { |
| 65 | final Field typeField = c.getField("TYPE"); |
| 66 | final Class primitiveType = (Class) typeField.get(null); |
| 67 | convertedTypes.put(primitiveType, t); |
| 68 | } catch (NoSuchFieldException e) { |
| 69 | // OK: must not be a primitive wrapper |
| 70 | } catch (IllegalAccessException e) { |
| 71 | // Should not reach here |
| 72 | throw new AssertionError(e); |
| 73 | } |
| 74 | } |
| 75 | } |
| 76 | } |
| 77 | |
| 78 | private static class InProgress extends OpenType { |
| 79 | private static final String description = |
| 80 | "Marker to detect recursive type use -- internal use only!"; |
| 81 | |
| 82 | InProgress() throws OpenDataException { |
| 83 | super("java.lang.String", "java.lang.String", description); |
| 84 | } |
| 85 | |
| 86 | public String toString() { |
| 87 | return description; |
| 88 | } |
| 89 | |
| 90 | public int hashCode() { |
| 91 | return 0; |
| 92 | } |
| 93 | |
| 94 | public boolean equals(Object o) { |
| 95 | return false; |
| 96 | } |
| 97 | |
| 98 | public boolean isValue(Object o) { |
| 99 | return false; |
| 100 | } |
| 101 | } |
| 102 | private static final OpenType inProgress; |
| 103 | static { |
| 104 | OpenType t; |
| 105 | try { |
| 106 | t = new InProgress(); |
| 107 | } catch (OpenDataException e) { |
| 108 | // Should not reach here |
| 109 | throw new AssertionError(e); |
| 110 | } |
| 111 | inProgress = t; |
| 112 | } |
| 113 | |
| 114 | // Convert a class to an OpenType |
| 115 | public static synchronized OpenType toOpenType(Class c) |
| 116 | throws OpenDataException { |
| 117 | |
| 118 | OpenType t; |
| 119 | |
| 120 | t = convertedTypes.get(c); |
| 121 | if (t != null) { |
| 122 | if (t instanceof InProgress) |
| 123 | throw new OpenDataException("Recursive data structure"); |
| 124 | return t; |
| 125 | } |
| 126 | |
| 127 | convertedTypes.put(c, inProgress); |
| 128 | |
| 129 | if (Enum.class.isAssignableFrom(c)) |
| 130 | t = STRING; |
| 131 | else if (c.isArray()) |
| 132 | t = makeArrayType(c); |
| 133 | else |
| 134 | t = makeCompositeType(c); |
| 135 | |
| 136 | convertedTypes.put(c, t); |
| 137 | |
| 138 | return t; |
| 139 | } |
| 140 | |
| 141 | private static OpenType makeArrayType(Class c) throws OpenDataException { |
| 142 | int dim; |
| 143 | for (dim = 0; c.isArray(); dim++) |
| 144 | c = c.getComponentType(); |
| 145 | return new ArrayType(dim, toOpenType(c)); |
| 146 | } |
| 147 | |
| 148 | private static OpenType makeCompositeType(Class c) |
| 149 | throws OpenDataException { |
| 150 | // Make a CompositeData containing all the getters |
| 151 | final Method[] methods = c.getMethods(); |
| 152 | final List<String> names = new ArrayList<String>(); |
| 153 | final List<OpenType> types = new ArrayList<OpenType>(); |
| 154 | |
| 155 | /* Select public methods that look like "T getX()" or "boolean |
| 156 | isX() or hasX()", where T is not void and X is not the empty |
| 157 | string. Exclude "Class getClass()" inherited from Object. */ |
| 158 | for (int i = 0; i < methods.length; i++) { |
| 159 | final Method method = methods[i]; |
| 160 | final String name = method.getName(); |
| 161 | final Class type = method.getReturnType(); |
| 162 | final String rest; |
| 163 | if (name.startsWith("get")) |
| 164 | rest = name.substring(3); |
| 165 | else if (name.startsWith("is") && type == boolean.class) |
| 166 | rest = name.substring(2); |
| 167 | else if (name.startsWith("has") && type == boolean.class) |
| 168 | rest = name.substring(3); |
| 169 | else |
| 170 | continue; |
| 171 | |
| 172 | if (rest.equals("") || method.getParameterTypes().length > 0 |
| 173 | || type == void.class || rest.equals("Class")) |
| 174 | continue; |
| 175 | |
| 176 | names.add(decapitalize(rest)); |
| 177 | types.add(toOpenType(type)); |
| 178 | } |
| 179 | |
| 180 | final String[] nameArray = names.toArray(new String[0]); |
| 181 | return new CompositeType(c.getName(), |
| 182 | c.getName(), |
| 183 | nameArray, // field names |
| 184 | nameArray, // field descriptions |
| 185 | types.toArray(new OpenType[0])); |
| 186 | } |
| 187 | |
| 188 | /** |
| 189 | * Utility method to take a string and convert it to normal Java variable |
| 190 | * name capitalization. This normally means converting the first |
| 191 | * character from upper case to lower case, but in the (unusual) special |
| 192 | * case when there is more than one character and both the first and |
| 193 | * second characters are upper case, we leave it alone. |
| 194 | * <p> |
| 195 | * Thus "FooBah" becomes "fooBah" and "X" becomes "x", but "URL" stays |
| 196 | * as "URL". |
| 197 | * |
| 198 | * @param name The string to be decapitalized. |
| 199 | * @return The decapitalized version of the string. |
| 200 | */ |
| 201 | private static String decapitalize(String name) { |
| 202 | if (name == null || name.length() == 0) { |
| 203 | return name; |
| 204 | } |
| 205 | if (name.length() > 1 && Character.isUpperCase(name.charAt(1)) && |
| 206 | Character.isUpperCase(name.charAt(0))){ |
| 207 | return name; |
| 208 | } |
| 209 | char chars[] = name.toCharArray(); |
| 210 | chars[0] = Character.toLowerCase(chars[0]); |
| 211 | return new String(chars); |
| 212 | } |
| 213 | |
| 214 | } |