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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 | +} | |