CodeDifferenceStrategy.java
- /*
- * Copyright (c) 2001-2024, Jean Tessier
- * All rights reserved.
- *
- * 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 Jean Tessier nor the names of his 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 REGENTS 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 com.jeantessier.diff;
- import java.util.*;
- import org.apache.logging.log4j.*;
- import com.jeantessier.classreader.*;
- import com.jeantessier.text.*;
- public class CodeDifferenceStrategy implements DifferenceStrategy {
- public boolean isPackageDifferent(Map<String, Classfile> oldPackage, Map<String, Classfile> newPackage) {
- return false;
- }
- public boolean isClassDifferent(Classfile oldClass, Classfile newClass) {
- return false;
- }
- public boolean isDeclarationModified(Classfile oldClass, Classfile newClass) {
- return false;
- }
- public boolean isFieldDifferent(Field_info oldField, Field_info newField) {
- return false;
- }
- public boolean isConstantValueDifferent(ConstantValue_attribute oldValue, ConstantValue_attribute newValue) {
- boolean result;
- if (oldValue != null) {
- result = !oldValue.equals(newValue);
- } else {
- result = oldValue != newValue;
- }
- return result;
- }
- public boolean isMethodDifferent(Method_info oldMethod, Method_info newMethod) {
- return false;
- }
- public boolean isCodeDifferent(Code_attribute oldCode, Code_attribute newCode) {
- boolean result;
- if (oldCode != null && newCode != null) {
- result = oldCode.getCode().length != newCode.getCode().length;
- Iterator<Instruction> oldIterator = oldCode.iterator();
- Iterator<Instruction> newIterator = newCode.iterator();
- while (!result && oldIterator.hasNext() && newIterator.hasNext()) {
- Instruction oldInstruction = oldIterator.next();
- Instruction newInstruction = newIterator.next();
- result = !oldInstruction.equals(newInstruction);
- }
- LogManager.getLogger(getClass()).debug("Code compare for {}", () -> oldCode.getOwner());
- LogManager.getLogger(getClass()).debug("old code: {}", () -> Hex.toString(oldCode.getCode()));
- LogManager.getLogger(getClass()).debug("new code: {}", () -> Hex.toString(newCode.getCode()));
- LogManager.getLogger(getClass()).debug(result ? "[different]" : "[same]");
- } else {
- result = oldCode != newCode;
- }
- return result;
- }
- }