| /* |
| * ProGuard -- shrinking, optimization, obfuscation, and preverification |
| * of Java bytecode. |
| * |
| * Copyright (c) 2002-2014 Eric Lafortune (eric@graphics.cornell.edu) |
| * |
| * This program is free software; you can redistribute it and/or modify it |
| * under the terms of the GNU General Public License as published by the Free |
| * Software Foundation; either version 2 of the License, or (at your option) |
| * any later version. |
| * |
| * This program is distributed in the hope that it will be useful, but WITHOUT |
| * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or |
| * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for |
| * more details. |
| * |
| * You should have received a copy of the GNU General Public License along |
| * with this program; if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA |
| */ |
| package proguard.classfile.editor; |
| |
| import proguard.classfile.ProgramClass; |
| import proguard.util.ArrayUtil; |
| |
| /** |
| * This class can add and delete interfaces to and from classes. References to |
| * the constant pool must be filled out beforehand. |
| * |
| * @author Eric Lafortune |
| */ |
| public class InterfacesEditor |
| { |
| private final ProgramClass targetClass; |
| |
| |
| /** |
| * Creates a new InterfacesEditor that will edit interfaces in the given |
| * target class. |
| */ |
| public InterfacesEditor(ProgramClass targetClass) |
| { |
| this.targetClass = targetClass; |
| } |
| |
| |
| /** |
| * Adds the specified interface to the target class, if it isn't present yet. |
| */ |
| public void addInterface(int interfaceConstantIndex) |
| { |
| // Is the interface not yet present? |
| if (findInterfaceIndex(interfaceConstantIndex) < 0) |
| { |
| // Append the interface. |
| targetClass.u2interfaces = |
| ArrayUtil.add(targetClass.u2interfaces, |
| targetClass.u2interfacesCount++, |
| interfaceConstantIndex); |
| } |
| } |
| |
| |
| /** |
| * Deletes the given interface from the target class, if it is present. |
| */ |
| public void deleteInterface(int interfaceConstantIndex) |
| { |
| // Is the interface already present? |
| int interfaceIndex = findInterfaceIndex(interfaceConstantIndex); |
| if (interfaceIndex >= 0) |
| { |
| int interfacesCount = --targetClass.u2interfacesCount; |
| int[] interfaces = targetClass.u2interfaces; |
| |
| // Shift the other interfaces in the array. |
| for (int index = interfaceIndex; index < interfacesCount; index++) |
| { |
| interfaces[index] = interfaces[index + 1]; |
| } |
| |
| // Clear the remaining entry in the array. |
| interfaces[interfacesCount] = 0; |
| } |
| } |
| |
| |
| // Small utility methods. |
| |
| /** |
| * Finds the index of the specified interface in the list of interfaces of |
| * the target class. |
| */ |
| private int findInterfaceIndex(int interfaceConstantIndex) |
| { |
| int interfacesCount = targetClass.u2interfacesCount; |
| int[] interfaces = targetClass.u2interfaces; |
| |
| for (int index = 0; index < interfacesCount; index++) |
| { |
| if (interfaces[index] == interfaceConstantIndex) |
| { |
| return index; |
| } |
| } |
| |
| return -1; |
| } |
| } |