| /* |
| * Copyright (c) 2000, 2020 Oracle and/or its affiliates. All rights reserved. |
| * Copyright (c) 2000, 2015 -2011 INRIA, France Telecom |
| * |
| * Redistribution and use in source and binary forms, with or without |
| * modification, are permitted provided that the following conditions |
| * are met: |
| * |
| * - Redistributions of source code must retain the above copyright |
| * notice, this list of conditions and the following disclaimer. |
| * |
| * - Redistributions in binary form must reproduce the above copyright |
| * notice, this list of conditions and the following disclaimer in the |
| * documentation and/or other materials provided with the distribution. |
| * |
| * - Neither the name of Oracle nor the names of its |
| * contributors may be used to endorse or promote products derived |
| * from this software without specific prior written permission. |
| * |
| * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS |
| * IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, |
| * THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR |
| * PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR |
| * CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, |
| * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, |
| * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR |
| * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF |
| * LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING |
| * NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS |
| * SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. |
| */ |
| |
| |
| package org.eclipse.persistence.internal.jpa.weaving; |
| |
| import java.io.IOException; |
| import java.io.InputStream; |
| |
| import org.eclipse.persistence.internal.libraries.asm.ClassReader; |
| import org.eclipse.persistence.internal.libraries.asm.ClassWriter; |
| import org.eclipse.persistence.internal.libraries.asm.Opcodes; |
| |
| /** |
| * A ClassWriter that computes the common super class of two classes without |
| * actually loading them with a ClassLoader. |
| * |
| * @author Eric Bruneton |
| */ |
| class ComputeClassWriter extends ClassWriter { |
| |
| private ClassLoader l = null;//getClass().getClassLoader(); |
| |
| public ComputeClassWriter(ClassLoader loader, final int flags) { |
| super(flags); |
| l = loader; |
| } |
| |
| @Override |
| protected String getCommonSuperClass(final String type1, final String type2) |
| { |
| try { |
| ClassReader info1 = typeInfo(type1); |
| ClassReader info2 = typeInfo(type2); |
| if ((info1.getAccess() & Opcodes.ACC_INTERFACE) != 0) { |
| if (typeImplements(type2, info2, type1)) { |
| return type1; |
| } else { |
| return "java/lang/Object"; |
| } |
| } |
| if ((info2.getAccess() & Opcodes.ACC_INTERFACE) != 0) { |
| if (typeImplements(type1, info1, type2)) { |
| return type2; |
| } else { |
| return "java/lang/Object"; |
| } |
| } |
| StringBuilder b1 = typeAncestors(type1, info1); |
| StringBuilder b2 = typeAncestors(type2, info2); |
| String result = "java/lang/Object"; |
| int end1 = b1.length(); |
| int end2 = b2.length(); |
| while (true) { |
| int start1 = b1.lastIndexOf(";", end1 - 1); |
| int start2 = b2.lastIndexOf(";", end2 - 1); |
| if (start1 != -1 && start2 != -1 |
| && end1 - start1 == end2 - start2) |
| { |
| String p1 = b1.substring(start1 + 1, end1); |
| String p2 = b2.substring(start2 + 1, end2); |
| if (p1.equals(p2)) { |
| result = p1; |
| end1 = start1; |
| end2 = start2; |
| } else { |
| return result; |
| } |
| } else { |
| return result; |
| } |
| } |
| } catch (IOException e) { |
| throw new RuntimeException(e.toString()); |
| } |
| } |
| |
| /** |
| * Returns the internal names of the ancestor classes of the given type. |
| * |
| * @param type the internal name of a class or interface. |
| * @param info the ClassReader corresponding to 'type'. |
| * @return a StringBuilder containing the ancestor classes of 'type', |
| * separated by ';'. The returned string has the following format: |
| * ";type1;type2 ... ;typeN", where type1 is 'type', and typeN is a |
| * direct subclass of Object. If 'type' is Object, the returned |
| * string is empty. |
| * @throws IOException if the bytecode of 'type' or of some of its ancestor |
| * class cannot be loaded. |
| */ |
| private StringBuilder typeAncestors(String type, ClassReader info) |
| throws IOException |
| { |
| StringBuilder b = new StringBuilder(); |
| while (!"java/lang/Object".equals(type)) { |
| b.append(';').append(type); |
| type = info.getSuperName(); |
| info = typeInfo(type); |
| } |
| return b; |
| } |
| |
| /** |
| * Returns true if the given type implements the given interface. |
| * |
| * @param type the internal name of a class or interface. |
| * @param info the ClassReader corresponding to 'type'. |
| * @param itf the internal name of a interface. |
| * @return true if 'type' implements directly or indirectly 'itf' |
| * @throws IOException if the bytecode of 'type' or of some of its ancestor |
| * class cannot be loaded. |
| */ |
| private boolean typeImplements(String type, ClassReader info, String itf) |
| throws IOException |
| { |
| while (!"java/lang/Object".equals(type)) { |
| String[] itfs = info.getInterfaces(); |
| for (int i = 0; i < itfs.length; ++i) { |
| if (itfs[i].equals(itf)) { |
| return true; |
| } |
| } |
| for (int i = 0; i < itfs.length; ++i) { |
| if (typeImplements(itfs[i], typeInfo(itfs[i]), itf)) { |
| return true; |
| } |
| } |
| type = info.getSuperName(); |
| info = typeInfo(type); |
| } |
| return false; |
| } |
| |
| /** |
| * Returns a ClassReader corresponding to the given class or interface. |
| * |
| * @param type the internal name of a class or interface. |
| * @return the ClassReader corresponding to 'type'. |
| * @throws IOException if the bytecode of 'type' cannot be loaded. |
| */ |
| private ClassReader typeInfo(final String type) throws IOException { |
| InputStream is = l.getResourceAsStream(type + ".class"); |
| try { |
| return new ClassReader(is); |
| } finally { |
| is.close(); |
| } |
| } |
| } |