1 /* 2 * Copyright (C) 2025 The Android Open Source Project 3 * 4 * Licensed under the Apache License, Version 2.0 (the "License"); 5 * you may not use this file except in compliance with the License. 6 * You may obtain a copy of the License at 7 * 8 * http://www.apache.org/licenses/LICENSE-2.0 9 * 10 * Unless required by applicable law or agreed to in writing, software 11 * distributed under the License is distributed on an "AS IS" BASIS, 12 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. 13 * See the License for the specific language governing permissions and 14 * limitations under the License. 15 */ 16 package com.android.dependencymapper; 17 18 import org.objectweb.asm.ClassReader; 19 20 import java.io.IOException; 21 import java.io.InputStream; 22 import java.nio.file.Path; 23 import java.util.ArrayList; 24 import java.util.Enumeration; 25 import java.util.List; 26 import java.util.jar.JarEntry; 27 import java.util.jar.JarFile; 28 29 /** 30 * An utility class that reads each class file present in the classes jar, then analyzes the same, 31 * collecting the dependencies in {@link List<ClassDependencyData>} 32 */ 33 public class ClassDependencyAnalyzer { 34 analyze(Path classJar, ClassRelevancyFilter classFilter)35 public static List<ClassDependencyData> analyze(Path classJar, ClassRelevancyFilter classFilter) { 36 List<ClassDependencyData> classAnalysisList = new ArrayList<>(); 37 try (JarFile jarFile = new JarFile(classJar.toFile())) { 38 Enumeration<JarEntry> entries = jarFile.entries(); 39 while (entries.hasMoreElements()) { 40 JarEntry entry = entries.nextElement(); 41 if (entry.getName().endsWith(".class")) { 42 try (InputStream inputStream = jarFile.getInputStream(entry)) { 43 String name = Utils.trimAndConvertToPackageBasedPath(entry.getName()); 44 ClassDependencyData classAnalysis = ClassDependenciesVisitor.analyze(name, 45 new ClassReader(inputStream), classFilter); 46 classAnalysisList.add(classAnalysis); 47 } 48 } 49 } 50 } catch (IOException e) { 51 System.err.println("Error reading the jar file at: " + classJar); 52 throw new RuntimeException(e); 53 } 54 return classAnalysisList; 55 } 56 } 57