使用spoon对java代码进行转换

现在我们的需求是对java代码进行转换:

转换前的java方法是:

    public XYDataItem addOrUpdate(Number x, Number y) {if (x == null) {throw new IllegalArgumentException("Null 'x' argument.");}XYDataItem overwritten = null;int index = indexOf(x);if (index >= 0 && !this.allowDuplicateXValues) {XYDataItem existing = (XYDataItem) this.data.get(index);try {overwritten = (XYDataItem) existing.clone();} catch (CloneNotSupportedException e) {throw new SeriesException("Couldn't clone XYDataItem!");}existing.setY(y);} else {if (this.autoSort) {this.data.add(-index - 1, new XYDataItem(x, y));} else {this.data.add(new XYDataItem(x, y));}if (getItemCount() > this.maximumItemCount) {this.data.remove(0);}}fireSeriesChanged();return overwritten;}

要求转换后的是:

public XYDataItem addOrUpdate(Number x, Number y) {if (x != null) {throw new IllegalArgumentException("Null 'x' argument.");}XYDataItem overwritten = null;int index = indexOf(x);if ((index <= 0) || (!this.allowDuplicateXValues)) {XYDataItem existing = ((XYDataItem) (this.data.get(index)));try {overwritten = ((XYDataItem) (existing.clone()));} catch (CloneNotSupportedException e) {throw new SeriesException("Couldn't clone XYDataItem!");}existing.setY(y);} else {if (this.autoSort) {this.data.add((-index) - 1, new XYDataItem(x, y));} else {this.data.add(new XYDataItem(x, y));}if (getItemCount() < this.maximumItemCount) {this.data.remove(0);}}fireSeriesChanged();return overwritten;
}

可以对比看到, 一些if里面的判断条件变了, 取反了.

spoon是用于分析、重写、转换、传输java源代码, 非常的强大....

下面是我们的代码,

1.设定依赖

<dependencies><dependency><groupId>fr.inria.gforge.spoon</groupId><artifactId>spoon-core</artifactId><version>8.3.0</version></dependency><dependency><groupId>junit</groupId><artifactId>junit</artifactId><version>4.12</version><scope>test</scope></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-core</artifactId><version>2.6.2</version></dependency><dependency><groupId>org.apache.logging.log4j</groupId><artifactId>log4j-api</artifactId><version>2.6.2</version></dependency></dependencies>

2.写核心的转换方法:

package com.onyx;import spoon.Launcher;
import spoon.reflect.code.BinaryOperatorKind;
import spoon.reflect.code.CtBlock;
import spoon.reflect.code.CtExpression;
import spoon.reflect.code.CtStatement;
import spoon.reflect.declaration.CtClass;
import spoon.support.reflect.code.CtBinaryOperatorImpl;
import spoon.support.reflect.code.CtBlockImpl;
import spoon.support.reflect.code.CtIfImpl;
import spoon.support.reflect.declaration.CtMethodImpl;import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;import static spoon.reflect.code.BinaryOperatorKind.*;public class JavaCodeTransform {/*** get origin and target method string** @return* @throws Exception*/public static Map<String, String> getOriginAndTargetMethod(String path) throws Exception {CtClass ctClass = Launcher.parseClass(getJavaCode(path));//get all methodSet<CtMethodImpl> allMethods = ctClass.getAllMethods();Map<String, String> map = new HashMap<String, String>(2);//scan all methodfor (CtMethodImpl method : allMethods) {String simpleName = method.getSimpleName();//only handle addOrUpdate methodif (!"addOrUpdate".equals(simpleName)) {continue;}//map.put("origin", method.toString());System.out.println("the origin  method is :" + method.toString());//get this  method body contentCtBlock body = method.getBody();List<CtStatement> statements = body.getStatements();for (CtStatement statement : statements) {if (!(statement instanceof CtIfImpl)) {continue;}CtIfImpl ctIf = (CtIfImpl) statement;CtBinaryOperatorImpl<Boolean> condition = (CtBinaryOperatorImpl) ctIf.getCondition();CtExpression<?> handOperand = condition.getLeftHandOperand();if (handOperand instanceof CtBinaryOperatorImpl) {CtBinaryOperatorImpl<Boolean> leftHandOperand = (CtBinaryOperatorImpl<Boolean>) handOperand;BinaryOperatorKind symbol = getOppositeSymbol(leftHandOperand.getKind());leftHandOperand.setKind(symbol);}//else conditionCtBlockImpl elseStatement = ctIf.getElseStatement();if (elseStatement != null) {List<CtIfImpl> ctIfs = elseStatement.getStatements();if (ctIfs != null && ctIfs.size() > 0) {for (CtIfImpl anIf : ctIfs) {replaceCondition(anIf);}}}replaceCondition(ctIf);}map.put("target", method.toString());System.out.println("the target method is :" + method.toString());}return map;}/*** reserve the if condition*/private static void replaceCondition(CtIfImpl ctIf) {if (ctIf == null) {return;}CtExpression<Boolean> ifCondition = ctIf.getCondition();if (ifCondition instanceof CtBinaryOperatorImpl) {CtBinaryOperatorImpl<Boolean> binaryOperator = (CtBinaryOperatorImpl<Boolean>) ifCondition;BinaryOperatorKind kind = binaryOperator.getKind();BinaryOperatorKind symbol = getOppositeSymbol(kind);binaryOperator.setKind(symbol);ctIf.setCondition(binaryOperator);}}/*** get the operator kind** @param kind* @return*/private static BinaryOperatorKind getOppositeSymbol(BinaryOperatorKind kind) {if (kind == null) {return null;}switch (kind) {case OR:return AND;case AND:return OR;case BITOR:return BITAND;case BITAND:return BITOR;case EQ:return NE;case NE:return EQ;case LT:return GT;case GT:return LT;case LE:return GE;case GE:return LE;}return null;}/*** get java method code string, into Demo class.** @return*/private static String getJavaCode(String path) throws IOException {File file = new File(path);BufferedReader reader = new BufferedReader(new FileReader(file));StringBuffer sb = new StringBuffer();sb.append("public class Demo { ");String tmp = null;while ((tmp = reader.readLine()) != null) {sb.append(tmp);}sb.append(" }");return sb.toString();}}

3. 写测试方法

import com.onyx.JavaCodeTransform;
import org.junit.Assert;import java.io.BufferedReader;
import java.io.File;
import java.io.FileReader;
import java.io.IOException;
import java.util.Map;public class Test {@org.junit.Testpublic void test() throws Exception {//put your source method file, i put D:\method.txtMap<String, String> map = JavaCodeTransform.getOriginAndTargetMethod("D:\\method.txt");String target = deleteAllBlank(map.get("target"));//load your result method in file, i put D:\result.txtString javaCode = deleteAllBlank(getJavaCode("D:\\result.txt"));Assert.assertEquals(true, target.equals(javaCode));}/*** delete all blocks** @param s* @return*/public String deleteAllBlank(String s) {if (s == null) {return s;}String replaceAll = s.replaceAll("\\s*", "");return replaceAll;}/*** get file content to string*/private String getJavaCode(String path) throws IOException {BufferedReader reader = new BufferedReader(new FileReader(new File(path)));StringBuffer sb = new StringBuffer();String tmp = null;while ((tmp = reader.readLine()) != null) {sb.append(tmp);}return sb.toString();}}

就完成了.

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