| /* |
| * Copyright (c) 1998, 2021 Oracle and/or its affiliates. All rights reserved. |
| * |
| * This program and the accompanying materials are made available under the |
| * terms of the Eclipse Public License v. 2.0 which is available at |
| * http://www.eclipse.org/legal/epl-2.0, |
| * or the Eclipse Distribution License v. 1.0 which is available at |
| * http://www.eclipse.org/org/documents/edl-v10.php. |
| * |
| * SPDX-License-Identifier: EPL-2.0 OR BSD-3-Clause |
| */ |
| |
| // Contributors: |
| // Oracle - initial API and implementation from Oracle TopLink |
| package org.eclipse.persistence.sdo.helper; |
| |
| import commonj.sdo.helper.HelperContext; |
| import java.util.HashMap; |
| import java.util.Map; |
| import org.eclipse.persistence.sdo.SDOType; |
| |
| /** |
| * <p><b>Purpose</b>: A custom classloader used to dynamically create classes as needed. |
| */ |
| public class SDOClassLoader extends ClassLoader { |
| |
| private Map<String, Class<?>> generatedClasses; |
| |
| // hold the context containing all helpers so that we can preserve inter-helper relationships |
| private HelperContext aHelperContext; |
| |
| public SDOClassLoader(ClassLoader delegateLoader, HelperContext aContext) { |
| super(delegateLoader); |
| aHelperContext = aContext; |
| generatedClasses = new HashMap(); |
| } |
| |
| @Override |
| public Class<?> loadClass(String className) throws ClassNotFoundException { |
| Class<?> javaClass = generatedClasses.get(className); |
| if (javaClass != null) { |
| return javaClass; |
| } |
| return getParent().loadClass(className); |
| } |
| |
| public Class<?> loadClass(String className, SDOType type) throws ClassNotFoundException { |
| // To maximize performance, check the generated classes first |
| Class<?> javaClass = generatedClasses.get(className); |
| if (javaClass != null) { |
| return javaClass; |
| } |
| |
| try { |
| javaClass = getParent().loadClass(className); |
| } catch (ClassNotFoundException e) { |
| javaClass = createGeneric(className, type); |
| if (javaClass == null) { |
| throw e; |
| } |
| } catch (NoClassDefFoundError error) { |
| javaClass = createGeneric(className, type); |
| if (javaClass == null) { |
| throw error; |
| } |
| } |
| if(!type.isDataType() && null != aHelperContext && null != aHelperContext.getTypeHelper()) { |
| ((SDOTypeHelper) aHelperContext.getTypeHelper()).getImplClassesToSDOType().put(javaClass, type); |
| } |
| return javaClass; |
| } |
| |
| public Class<?> createGeneric(String className, SDOType type) { |
| Class<?> javaClass = generatedClasses.get(className); |
| if (javaClass != null) { |
| return javaClass; |
| } |
| |
| if (className == null) { |
| return null; |
| } |
| |
| DynamicClassWriter dcWriter = new DynamicClassWriter(className, type, aHelperContext); |
| |
| byte[] bytes = dcWriter.createClass(); |
| |
| javaClass = defineClass(className, bytes, 0, bytes.length); |
| generatedClasses.put(className, javaClass); |
| return javaClass; |
| } |
| |
| } |