| // Copyright 2008 Google Inc. |
| // |
| // Licensed under the Apache License, Version 2.0 (the "License"); |
| // you may not use this file except in compliance with the License. |
| // You may obtain a copy of the License at |
| // |
| // http://www.apache.org/licenses/LICENSE-2.0 |
| // |
| // Unless required by applicable law or agreed to in writing, software |
| // distributed under the License is distributed on an "AS IS" BASIS, |
| // WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| // See the License for the specific language governing permissions and |
| // limitations under the License. |
| |
| package com.google.gwtorm.server; |
| |
| import java.io.File; |
| import java.io.FileOutputStream; |
| import java.io.IOException; |
| import java.lang.reflect.InvocationTargetException; |
| import java.lang.reflect.Method; |
| |
| /** |
| * Hacked ClassLoader to inject generated code into the parent. |
| * |
| * <p>This ClassLoader allows our code generators to inject their generated classes into the parent |
| * ClassLoader, which should be the same ClassLoader that defined the application's Schema interface |
| * extension. This is necessary to ensure the generated classes can access protected and |
| * default-access fields within the entities. |
| */ |
| public class GeneratedClassLoader extends ClassLoader { |
| private static final boolean debugCodeGen; |
| |
| private static final Method defineClass; |
| |
| static { |
| debugCodeGen = "true".equals(System.getProperty("gwtorm.debugCodeGen")); |
| |
| Method m; |
| try { |
| m = |
| ClassLoader.class.getDeclaredMethod( |
| "defineClass", String.class, byte[].class, Integer.TYPE, Integer.TYPE); |
| m.setAccessible(true); |
| } catch (SecurityException e) { |
| throw new LinkageError("No defineClass in ClassLoader"); |
| } catch (NoSuchMethodException e) { |
| throw new LinkageError("No defineClass in ClassLoader"); |
| } |
| defineClass = m; |
| } |
| |
| public GeneratedClassLoader(final ClassLoader parent) { |
| super(parent); |
| } |
| |
| public void defineClass(final String name, final byte[] code) throws OrmException { |
| if (debugCodeGen) { |
| final File outClassFile = new File("generated_classes/" + name.replace('.', '/') + ".class"); |
| outClassFile.getParentFile().mkdirs(); |
| try { |
| final FileOutputStream out = new FileOutputStream(outClassFile); |
| try { |
| out.write(code); |
| } finally { |
| out.close(); |
| } |
| } catch (IOException e) { |
| throw new OrmException("Cannot save debug class " + outClassFile, e); |
| } |
| } |
| |
| try { |
| defineClass.invoke(getParent(), name, code, Integer.valueOf(0), Integer.valueOf(code.length)); |
| } catch (IllegalArgumentException e) { |
| throw new OrmException("Unable to inject class " + name, e); |
| } catch (SecurityException e) { |
| throw new OrmException("Unable to inject class " + name, e); |
| } catch (IllegalAccessException e) { |
| throw new OrmException("Unable to inject class " + name, e); |
| } catch (InvocationTargetException e) { |
| throw new OrmException("Unable to inject class " + name, e); |
| } |
| } |
| } |