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| 1 | /* | ||
| 2 | * Copyright (c) 1996, 2010, Oracle and/or its affiliates. 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. Oracle designates this | ||
| 8 | * particular file as subject to the "Classpath" exception as provided | ||
| 9 | * by Oracle in the LICENSE file that accompanied this code. | ||
| 10 | * | ||
| 11 | * This code is distributed in the hope that it will be useful, but WITHOUT | ||
| 12 | * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or | ||
| 13 | * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License | ||
| 14 | * version 2 for more details (a copy is included in the LICENSE file that | ||
| 15 | * accompanied this code). | ||
| 16 | * | ||
| 17 | * You should have received a copy of the GNU General Public License version | ||
| 18 | * 2 along with this work; if not, write to the Free Software Foundation, | ||
| 19 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA. | ||
| 20 | * | ||
| 21 | * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA | ||
| 22 | * or visit www.oracle.com if you need additional information or have any | ||
| 23 | * questions. | ||
| 24 | */ | ||
| 25 | |||
| 26 | package java.beans; | ||
| 27 | |||
| 28 | import java.lang.ref.Reference; | ||
| 29 | import java.lang.ref.WeakReference; | ||
| 30 | import java.lang.reflect.Method; | ||
| 31 | import java.util.List; | ||
| 32 | import java.util.ArrayList; | ||
| 33 | |||
| 34 | /** | ||
| 35 | * A MethodDescriptor describes a particular method that a Java Bean | ||
| 36 | * supports for external access from other components. | ||
| 37 | */ | ||
| 38 | |||
| 39 | public class MethodDescriptor extends FeatureDescriptor { | ||
| 40 | |||
| 41 | private Reference<Method> methodRef; | ||
| 42 | |||
| 43 | private String[] paramNames; | ||
| 44 | |||
| 45 | private List params; | ||
| 46 | |||
| 47 | private ParameterDescriptor parameterDescriptors[]; | ||
| 48 | |||
| 49 | /** | ||
| 50 | * Constructs a <code>MethodDescriptor</code> from a | ||
| 51 | * <code>Method</code>. | ||
| 52 | * | ||
| 53 | * @param method The low-level method information. | ||
| 54 | */ | ||
| 55 | public MethodDescriptor(Method method) { | ||
| 56 | this(method, null); | ||
| 57 | } | ||
| 58 | |||
| 59 | |||
| 60 | /** | ||
| 61 | * Constructs a <code>MethodDescriptor</code> from a | ||
| 62 | * <code>Method</code> providing descriptive information for each | ||
| 63 | * of the method's parameters. | ||
| 64 | * | ||
| 65 | * @param method The low-level method information. | ||
| 66 | * @param parameterDescriptors Descriptive information for each of the | ||
| 67 | * method's parameters. | ||
| 68 | */ | ||
| 69 | public MethodDescriptor(Method method, | ||
| 70 | ParameterDescriptor parameterDescriptors[]) { | ||
| 71 | setName(method.getName()); | ||
| 72 | setMethod(method); | ||
| 73 | this.parameterDescriptors = parameterDescriptors; | ||
| 74 | } | ||
| 75 | |||
| 76 | /** | ||
| 77 | * Gets the method that this MethodDescriptor encapsualtes. | ||
| 78 | * | ||
| 79 | * @return The low-level description of the method | ||
| 80 | */ | ||
| 81 | public synchronized Method getMethod() { | ||
| 82 | Method method = getMethod0(); | ||
| 83 | if (method == null) { | ||
| 84 | Class cls = getClass0(); | ||
| 85 | String name = getName(); | ||
| 86 | if ((cls != null) && (name != null)) { | ||
| 87 | Class[] params = getParams(); | ||
| 88 | if (params == null) { | ||
| 89 | for (int i = 0; i < 3; i++) { | ||
| 90 | // Find methods for up to 2 params. We are guessing here. | ||
| 91 | // This block should never execute unless the classloader | ||
| 92 | // that loaded the argument classes disappears. | ||
| 93 | method = Introspector.findMethod(cls, name, i, null); | ||
| 94 | if (method != null) { | ||
| 95 | break; | ||
| 96 | } | ||
| 97 | } | ||
| 98 | } else { | ||
| 99 | method = Introspector.findMethod(cls, name, params.length, params); | ||
| 100 | } | ||
| 101 | setMethod(method); | ||
| 102 | } | ||
| 103 | } | ||
| 104 | return method; | ||
| 105 | } | ||
| 106 | |||
| 107 | private synchronized void setMethod(Method method) { | ||
| 108 | if (method == null) { | ||
| 109 | return; | ||
| 110 | } | ||
| 111 | if (getClass0() == null) { | ||
| 112 | setClass0(method.getDeclaringClass()); | ||
| 113 | } | ||
| 114 | setParams(getParameterTypes(getClass0(), method)); | ||
| 115 | this.methodRef = getSoftReference(method); | ||
| 116 | } | ||
| 117 | |||
| 118 | private Method getMethod0() { | ||
| 119 | return (this.methodRef != null) | ||
| 120 | ? this.methodRef.get() | ||
| 121 | : null; | ||
| 122 | } | ||
| 123 | |||
| 124 | private synchronized void setParams(Class[] param) { | ||
| 125 | if (param == null) { | ||
| 126 | return; | ||
| 127 | } | ||
| 128 | paramNames = new String[param.length]; | ||
| 129 | params = new ArrayList(param.length); | ||
| 130 | for (int i = 0; i < param.length; i++) { | ||
| 131 | paramNames[i] = param[i].getName(); | ||
| 132 | params.add(new WeakReference(param[i])); | ||
| 133 | } | ||
| 134 | } | ||
| 135 | |||
| 136 | // pp getParamNames used as an optimization to avoid method.getParameterTypes. | ||
| 137 | String[] getParamNames() { | ||
| 138 | return paramNames; | ||
| 139 | } | ||
| 140 | |||
| 141 | private synchronized Class[] getParams() { | ||
| 142 | Class[] clss = new Class[params.size()]; | ||
| 143 | |||
| 144 | for (int i = 0; i < params.size(); i++) { | ||
| 145 | Reference ref = (Reference)params.get(i); | ||
| 146 | Class cls = (Class)ref.get(); | ||
| 147 | if (cls == null) { | ||
| 148 | return null; | ||
| 149 | } else { | ||
| 150 | clss[i] = cls; | ||
| 151 | } | ||
| 152 | } | ||
| 153 | return clss; | ||
| 154 | } | ||
| 155 | |||
| 156 | /** | ||
| 157 | * Gets the ParameterDescriptor for each of this MethodDescriptor's | ||
| 158 | * method's parameters. | ||
| 159 | * | ||
| 160 | * @return The locale-independent names of the parameters. May return | ||
| 161 | * a null array if the parameter names aren't known. | ||
| 162 | */ | ||
| 163 | public ParameterDescriptor[] getParameterDescriptors() { | ||
| 164 | return parameterDescriptors; | ||
| 165 | } | ||
| 166 | |||
| 167 | /* | ||
| 168 | * Package-private constructor | ||
| 169 | * Merge two method descriptors. Where they conflict, give the | ||
| 170 | * second argument (y) priority over the first argument (x). | ||
| 171 | * @param x The first (lower priority) MethodDescriptor | ||
| 172 | * @param y The second (higher priority) MethodDescriptor | ||
| 173 | */ | ||
| 174 | |||
| 175 | MethodDescriptor(MethodDescriptor x, MethodDescriptor y) { | ||
| 176 | super(x,y); | ||
| 177 | |||
| 178 | methodRef = x.methodRef; | ||
| 179 | if (y.methodRef != null) { | ||
| 180 | methodRef = y.methodRef; | ||
| 181 | } | ||
| 182 | params = x.params; | ||
| 183 | if (y.params != null) { | ||
| 184 | params = y.params; | ||
| 185 | } | ||
| 186 | paramNames = x.paramNames; | ||
| 187 | if (y.paramNames != null) { | ||
| 188 | paramNames = y.paramNames; | ||
| 189 | } | ||
| 190 | |||
| 191 | parameterDescriptors = x.parameterDescriptors; | ||
| 192 | if (y.parameterDescriptors != null) { | ||
| 193 | parameterDescriptors = y.parameterDescriptors; | ||
| 194 | } | ||
| 195 | } | ||
| 196 | |||
| 197 | /* | ||
| 198 | * Package-private dup constructor | ||
| 199 | * This must isolate the new object from any changes to the old object. | ||
| 200 | */ | ||
| 201 | MethodDescriptor(MethodDescriptor old) { | ||
| 202 | super(old); | ||
| 203 | |||
| 204 | methodRef = old.methodRef; | ||
| 205 | params = old.params; | ||
| 206 | paramNames = old.paramNames; | ||
| 207 | |||
| 208 | if (old.parameterDescriptors != null) { | ||
| 209 | int len = old.parameterDescriptors.length; | ||
| 210 | parameterDescriptors = new ParameterDescriptor[len]; | ||
| 211 | for (int i = 0; i < len ; i++) { | ||
| 212 | parameterDescriptors[i] = new ParameterDescriptor(old.parameterDescriptors[i]); | ||
| 213 | } | ||
| 214 | } | ||
| 215 | } | ||
| 216 | |||
| 217 | void appendTo(StringBuilder sb) { | ||
| 218 | appendTo(sb, "method", this.methodRef); | ||
| 219 | if (this.parameterDescriptors != null) { | ||
| 220 | sb.append("; parameterDescriptors={"); | ||
| 221 | for (ParameterDescriptor pd : this.parameterDescriptors) { | ||
| 222 | sb.append(pd).append(", "); | ||
| 223 | } | ||
| 224 | sb.setLength(sb.length() - 2); | ||
| 225 | sb.append("}"); | ||
| 226 | } | ||
| 227 | } | ||
| 228 | } | ||