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| 1 | /* | ||
| 2 | * Copyright (c) 2005, 2008, 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 com.sun.jmx.mbeanserver; | ||
| 27 | import java.io.InvalidObjectException; | ||
| 28 | import java.lang.reflect.InvocationTargetException; | ||
| 29 | import java.lang.reflect.Method; | ||
| 30 | import java.lang.reflect.Type; | ||
| 31 | |||
| 32 | import javax.management.Descriptor; | ||
| 33 | import javax.management.MBeanException; | ||
| 34 | import javax.management.openmbean.OpenDataException; | ||
| 35 | import javax.management.openmbean.OpenType; | ||
| 36 | |||
| 37 | final class ConvertingMethod { | ||
| 38 | static ConvertingMethod from(Method m) { | ||
| 39 | try { | ||
| 40 | return new ConvertingMethod(m); | ||
| 41 | } catch (OpenDataException ode) { | ||
| 42 | final String msg = "Method " + m.getDeclaringClass().getName() + | ||
| 43 | "." + m.getName() + " has parameter or return type that " + | ||
| 44 | "cannot be translated into an open type"; | ||
| 45 | throw new IllegalArgumentException(msg, ode); | ||
| 46 | } | ||
| 47 | } | ||
| 48 | |||
| 49 | Method getMethod() { | ||
| 50 | return method; | ||
| 51 | } | ||
| 52 | |||
| 53 | Descriptor getDescriptor() { | ||
| 54 | return Introspector.descriptorForElement(method); | ||
| 55 | } | ||
| 56 | |||
| 57 | Type getGenericReturnType() { | ||
| 58 | return method.getGenericReturnType(); | ||
| 59 | } | ||
| 60 | |||
| 61 | Type[] getGenericParameterTypes() { | ||
| 62 | return method.getGenericParameterTypes(); | ||
| 63 | } | ||
| 64 | |||
| 65 | String getName() { | ||
| 66 | return method.getName(); | ||
| 67 | } | ||
| 68 | |||
| 69 | OpenType<?> getOpenReturnType() { | ||
| 70 | return returnMapping.getOpenType(); | ||
| 71 | } | ||
| 72 | |||
| 73 | OpenType<?>[] getOpenParameterTypes() { | ||
| 74 | final OpenType<?>[] types = new OpenType<?>[paramMappings.length]; | ||
| 75 | for (int i = 0; i < paramMappings.length; i++) | ||
| 76 | types[i] = paramMappings[i].getOpenType(); | ||
| 77 | return types; | ||
| 78 | } | ||
| 79 | |||
| 80 | /* Check that this method will be callable when we are going from | ||
| 81 | * open types to Java types, for example when we are going from | ||
| 82 | * an MXBean wrapper to the underlying resource. | ||
| 83 | * The parameters will be converted to | ||
| 84 | * Java types, so they must be "reconstructible". The return | ||
| 85 | * value will be converted to an Open Type, so if it is convertible | ||
| 86 | * at all there is no further check needed. | ||
| 87 | */ | ||
| 88 | void checkCallFromOpen() { | ||
| 89 | try { | ||
| 90 | for (MXBeanMapping paramConverter : paramMappings) | ||
| 91 | paramConverter.checkReconstructible(); | ||
| 92 | } catch (InvalidObjectException e) { | ||
| 93 | throw new IllegalArgumentException(e); | ||
| 94 | } | ||
| 95 | } | ||
| 96 | |||
| 97 | /* Check that this method will be callable when we are going from | ||
| 98 | * Java types to open types, for example when we are going from | ||
| 99 | * an MXBean proxy to the open types that it will be mapped to. | ||
| 100 | * The return type will be converted back to a Java type, so it | ||
| 101 | * must be "reconstructible". The parameters will be converted to | ||
| 102 | * open types, so if it is convertible at all there is no further | ||
| 103 | * check needed. | ||
| 104 | */ | ||
| 105 | void checkCallToOpen() { | ||
| 106 | try { | ||
| 107 | returnMapping.checkReconstructible(); | ||
| 108 | } catch (InvalidObjectException e) { | ||
| 109 | throw new IllegalArgumentException(e); | ||
| 110 | } | ||
| 111 | } | ||
| 112 | |||
| 113 | String[] getOpenSignature() { | ||
| 114 | if (paramMappings.length == 0) | ||
| 115 | return noStrings; | ||
| 116 | |||
| 117 | String[] sig = new String[paramMappings.length]; | ||
| 118 | for (int i = 0; i < paramMappings.length; i++) | ||
| 119 | sig[i] = paramMappings[i].getOpenClass().getName(); | ||
| 120 | return sig; | ||
| 121 | } | ||
| 122 | |||
| 123 | final Object toOpenReturnValue(MXBeanLookup lookup, Object ret) | ||
| 124 | throws OpenDataException { | ||
| 125 | return returnMapping.toOpenValue(ret); | ||
| 126 | } | ||
| 127 | |||
| 128 | final Object fromOpenReturnValue(MXBeanLookup lookup, Object ret) | ||
| 129 | throws InvalidObjectException { | ||
| 130 | return returnMapping.fromOpenValue(ret); | ||
| 131 | } | ||
| 132 | |||
| 133 | final Object[] toOpenParameters(MXBeanLookup lookup, Object[] params) | ||
| 134 | throws OpenDataException { | ||
| 135 | if (paramConversionIsIdentity || params == null) | ||
| 136 | return params; | ||
| 137 | final Object[] oparams = new Object[params.length]; | ||
| 138 | for (int i = 0; i < params.length; i++) | ||
| 139 | oparams[i] = paramMappings[i].toOpenValue(params[i]); | ||
| 140 | return oparams; | ||
| 141 | } | ||
| 142 | |||
| 143 | final Object[] fromOpenParameters(Object[] params) | ||
| 144 | throws InvalidObjectException { | ||
| 145 | if (paramConversionIsIdentity || params == null) | ||
| 146 | return params; | ||
| 147 | final Object[] jparams = new Object[params.length]; | ||
| 148 | for (int i = 0; i < params.length; i++) | ||
| 149 | jparams[i] = paramMappings[i].fromOpenValue(params[i]); | ||
| 150 | return jparams; | ||
| 151 | } | ||
| 152 | |||
| 153 | final Object toOpenParameter(MXBeanLookup lookup, | ||
| 154 | Object param, | ||
| 155 | int paramNo) | ||
| 156 | throws OpenDataException { | ||
| 157 | return paramMappings[paramNo].toOpenValue(param); | ||
| 158 | } | ||
| 159 | |||
| 160 | final Object fromOpenParameter(MXBeanLookup lookup, | ||
| 161 | Object param, | ||
| 162 | int paramNo) | ||
| 163 | throws InvalidObjectException { | ||
| 164 | return paramMappings[paramNo].fromOpenValue(param); | ||
| 165 | } | ||
| 166 | |||
| 167 | Object invokeWithOpenReturn(MXBeanLookup lookup, | ||
| 168 | Object obj, Object[] params) | ||
| 169 | throws MBeanException, IllegalAccessException, | ||
| 170 | InvocationTargetException { | ||
| 171 | MXBeanLookup old = MXBeanLookup.getLookup(); | ||
| 172 | try { | ||
| 173 | MXBeanLookup.setLookup(lookup); | ||
| 174 | return invokeWithOpenReturn(obj, params); | ||
| 175 | } finally { | ||
| 176 | MXBeanLookup.setLookup(old); | ||
| 177 | } | ||
| 178 | } | ||
| 179 | |||
| 180 | private Object invokeWithOpenReturn(Object obj, Object[] params) | ||
| 181 | throws MBeanException, IllegalAccessException, | ||
| 182 | InvocationTargetException { | ||
| 183 | final Object[] javaParams; | ||
| 184 | try { | ||
| 185 | javaParams = fromOpenParameters(params); | ||
| 186 | } catch (InvalidObjectException e) { | ||
| 187 | // probably can't happen | ||
| 188 | final String msg = methodName() + ": cannot convert parameters " + | ||
| 189 | "from open values: " + e; | ||
| 190 | throw new MBeanException(e, msg); | ||
| 191 | } | ||
| 192 | final Object javaReturn = method.invoke(obj, javaParams); | ||
| 193 | try { | ||
| 194 | return returnMapping.toOpenValue(javaReturn); | ||
| 195 | } catch (OpenDataException e) { | ||
| 196 | // probably can't happen | ||
| 197 | final String msg = methodName() + ": cannot convert return " + | ||
| 198 | "value to open value: " + e; | ||
| 199 | throw new MBeanException(e, msg); | ||
| 200 | } | ||
| 201 | } | ||
| 202 | |||
| 203 | private String methodName() { | ||
| 204 | return method.getDeclaringClass() + "." + method.getName(); | ||
| 205 | } | ||
| 206 | |||
| 207 | private ConvertingMethod(Method m) throws OpenDataException { | ||
| 208 | this.method = m; | ||
| 209 | MXBeanMappingFactory mappingFactory = MXBeanMappingFactory.DEFAULT; | ||
| 210 | returnMapping = | ||
| 211 | mappingFactory.mappingForType(m.getGenericReturnType(), mappingFactory); | ||
| 212 | Type[] params = m.getGenericParameterTypes(); | ||
| 213 | paramMappings = new MXBeanMapping[params.length]; | ||
| 214 | boolean identity = true; | ||
| 215 | for (int i = 0; i < params.length; i++) { | ||
| 216 | paramMappings[i] = mappingFactory.mappingForType(params[i], mappingFactory); | ||
| 217 | identity &= DefaultMXBeanMappingFactory.isIdentity(paramMappings[i]); | ||
| 218 | } | ||
| 219 | paramConversionIsIdentity = identity; | ||
| 220 | } | ||
| 221 | |||
| 222 | private static final String[] noStrings = new String[0]; | ||
| 223 | |||
| 224 | private final Method method; | ||
| 225 | private final MXBeanMapping returnMapping; | ||
| 226 | private final MXBeanMapping[] paramMappings; | ||
| 227 | private final boolean paramConversionIsIdentity; | ||
| 228 | } | ||