| 1 | /* |
| 2 | |
| 3 | Derby - Class org.apache.derby.impl.services.reflect.ReflectClassesJava2 |
| 4 | |
| 5 | Copyright 2000, 2004 The Apache Software Foundation or its licensors, as applicable. |
| 6 | |
| 7 | Licensed under the Apache License, Version 2.0 (the "License"); |
| 8 | you may not use this file except in compliance with the License. |
| 9 | You may obtain a copy of the License at |
| 10 | |
| 11 | http://www.apache.org/licenses/LICENSE-2.0 |
| 12 | |
| 13 | Unless required by applicable law or agreed to in writing, software |
| 14 | distributed under the License is distributed on an "AS IS" BASIS, |
| 15 | WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| 16 | See the License for the specific language governing permissions and |
| 17 | limitations under the License. |
| 18 | |
| 19 | */ |
| 20 | |
| 21 | package org.apache.derby.impl.services.reflect; |
| 22 | import org.apache.derby.iapi.util.ByteArray; |
| 23 | |
| 24 | /** |
| 25 | Relfect loader with Privileged block for Java 2 security. |
| 26 | */ |
| 27 | |
| 28 | public final class ReflectClassesJava2 extends DatabaseClasses |
| 29 | implements java.security.PrivilegedAction |
| 30 | { |
| 31 | |
| 32 | private java.util.HashMap preCompiled; |
| 33 | |
| 34 | private int action = -1; |
| 35 | |
| 36 | synchronized LoadedGeneratedClass loadGeneratedClassFromData(String fullyQualifiedName, ByteArray classDump) { |
| 37 | |
| 38 | if (classDump == null || classDump.getArray() == null) { |
| 39 | |
| 40 | if (preCompiled == null) |
| 41 | preCompiled = new java.util.HashMap(); |
| 42 | else |
| 43 | { |
| 44 | ReflectGeneratedClass gc = (ReflectGeneratedClass) preCompiled.get(fullyQualifiedName); |
| 45 | if (gc != null) |
| 46 | return gc; |
| 47 | } |
| 48 | |
| 49 | // not a generated class, just load the class directly. |
| 50 | try { |
| 51 | Class jvmClass = Class.forName(fullyQualifiedName); |
| 52 | ReflectGeneratedClass gc = new ReflectGeneratedClass(this, jvmClass, null); |
| 53 | preCompiled.put(fullyQualifiedName, gc); |
| 54 | return gc; |
| 55 | } catch (ClassNotFoundException cnfe) { |
| 56 | throw new NoClassDefFoundError(cnfe.toString()); |
| 57 | } |
| 58 | } |
| 59 | |
| 60 | action = 1; |
| 61 | return ((ReflectLoaderJava2) java.security.AccessController.doPrivileged(this)).loadGeneratedClass(fullyQualifiedName, classDump); |
| 62 | } |
| 63 | |
| 64 | public final Object run() { |
| 65 | |
| 66 | try { |
| 67 | // SECURITY PERMISSION - MP2 |
| 68 | switch (action) { |
| 69 | case 1: |
| 70 | return new ReflectLoaderJava2(getClass().getClassLoader(), this); |
| 71 | case 2: |
| 72 | return Thread.currentThread().getContextClassLoader(); |
| 73 | default: |
| 74 | return null; |
| 75 | } |
| 76 | } finally { |
| 77 | action = -1; |
| 78 | } |
| 79 | |
| 80 | } |
| 81 | |
| 82 | Class loadClassNotInDatabaseJar(String name) throws ClassNotFoundException { |
| 83 | |
| 84 | Class foundClass = null; |
| 85 | |
| 86 | // We may have two problems with calling getContextClassLoader() |
| 87 | // when trying to find our own classes for aggregates. |
| 88 | // 1) If using the URLClassLoader a ClassNotFoundException may be |
| 89 | // thrown (Beetle 5002). |
| 90 | // 2) If cloudscape is loaded with JNI, getContextClassLoader() |
| 91 | // may return null. (Beetle 5171) |
| 92 | // |
| 93 | // If this happens we need to user the class loader of this object |
| 94 | // (the classLoader that loaded Cloudscape). |
| 95 | // So we call Class.forName to ensure that we find the class. |
| 96 | try { |
| 97 | ClassLoader cl; |
| 98 | synchronized(this) { |
| 99 | action = 2; |
| 100 | cl = ((ClassLoader) |
| 101 | java.security.AccessController.doPrivileged(this)); |
| 102 | } |
| 103 | |
| 104 | foundClass = (cl != null) ? cl.loadClass(name) |
| 105 | :Class.forName(name); |
| 106 | } catch (ClassNotFoundException cnfe) { |
| 107 | foundClass = Class.forName(name); |
| 108 | } |
| 109 | return foundClass; |
| 110 | } |
| 111 | } |