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Diffstat (limited to 'third_party/java/proguard/proguard5.3.3/src/proguard/classfile/editor/InterfacesEditor.java')
| -rw-r--r-- | third_party/java/proguard/proguard5.3.3/src/proguard/classfile/editor/InterfacesEditor.java | 109 |
1 files changed, 109 insertions, 0 deletions
diff --git a/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/editor/InterfacesEditor.java b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/editor/InterfacesEditor.java new file mode 100644 index 0000000000..7d0599b205 --- /dev/null +++ b/third_party/java/proguard/proguard5.3.3/src/proguard/classfile/editor/InterfacesEditor.java @@ -0,0 +1,109 @@ +/* + * ProGuard -- shrinking, optimization, obfuscation, and preverification + * of Java bytecode. + * + * Copyright (c) 2002-2017 Eric Lafortune @ GuardSquare + * + * 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; + } +}
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