How to print all types of read and write access list to class fields for each methods of class in Java with JavaParser library
<p>In Java, fields can be accessed in various ways within methods. These accesses can be categorized as read or write operations. Using the JavaParser library, we can identify and list these field accesses for each method in a class.</p>
<p>Here's an example of how to achieve this:</p>
<pre>
import com.github.javaparser.StaticJavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
import com.github.javaparser.ast.body.MethodDeclaration;
import com.github.javaparser.ast.expr.FieldAccessExpr;
import com.github.javaparser.ast.expr.NameExpr;
import com.github.javaparser.symbolsolver.JavaSymbolSolver;
import com.github.javaparser.symbolsolver.resolution.typesolvers.MemoryTypeSolver;
import java.io.File;
import java.util.List;
import java.util.stream.Collectors;
public class FieldAccessLister {
public static void main(String[] args) {
// Set up the Java symbol solver
JavaSymbolSolver symbolSolver = new JavaSymbolSolver(new MemoryTypeSolver());
StaticJavaParser.getParserConfiguration().setSymbolResolver(symbolSolver);
// Example source file
File sourceFile = new File("Example.java");
CompilationUnit cu = StaticJavaParser.parse(sourceFile);
// Iterate over classes
cu.findAll(ClassOrInterfaceDeclaration.class).forEach(classDeclaration -> {
System.out.println("Class: " + classDeclaration.getNameAsString());
// Iterate over methods
classDeclaration.findAll(MethodDeclaration.class).forEach(methodDeclaration -> {
System.out.println(" Method: " + methodDeclaration.getNameAsString());
// Initialize lists for read and write accesses
List<String> readAccesses = new ArrayList<>();
List<String> writeAccesses = new ArrayList<>();
// Process field access expressions
methodDeclaration.findAll(FieldAccessExpr.class).forEach(fieldAccessExpr -> {
// Get the name of the accessed field
String fieldName = fieldAccessExpr.getNameAsString();
// Check if it's a read or write access
if (fieldAccessExpr.isRead()) {
readAccesses.add(fieldName);
} else {
writeAccesses.add(fieldName);
}
});
// Process name expressions
methodDeclaration.findAll(NameExpr.class).forEach(nameExpr -> {
// Resolve the name expression to get the symbol
Symbol symbol = nameExpr.resolve();
// Check if the symbol is a field
if (symbol instanceof FieldSymbol) {
// Get the name of the accessed field
String fieldName = nameExpr.getNameAsString();
// Check if it's a read or write access
if (nameExpr.isRead()) {
readAccesses.add(fieldName);
} else {
writeAccesses.add(fieldName);
}
}
});
// Print the collected field accesses
System.out.println(" Read accesses:");
readAccesses.forEach(field -> System.out.println(" " + field));
System.out.println(" Write accesses:");
writeAccesses.forEach(field -> System.out.println(" " + field));
});
});
}
}
</pre>
<p>The JavaSymbolSolver is used to resolve name expressions to symbols, allowing us to determine whether they refer to fields or not.</p>
<p>In this approach, we collect both read and write accesses for fields separately. This can be useful if you need to analyze how fields are being used within methods.</p>
<p>Note that this is just an example, and you may need to modify the code to suit your specific requirements.</p>