JavaParser - A tool to generate, analyze and refactor Java code

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JavaParser
A tool to generate, analyze, and refactor Java code
Federico Tomassetti founder of

Goal
JavaParser is evolving in a suite of libraries to support:
• Code generation
• Code analysis
• Code refactoring
It ha...

What JavaParser does?
JavaParser… parse Java code into a Java AST
package foo.bar;
class A {
int field;
}
CompilationUnit
...

What JavaParser does?
JavaParser unparse an AST into code
package foo.bar;
class A {
int field;
}
CompilationUnit
PackageD...

Why do you need symbol resolving?
int foo;
public void aMethod(int foo) {
foo = 1;
}
public void anotherMethod() {
foo = 1...

public void print1(String foo) {
System.out.print(foo);
}
public void print2(int foo) {
System.out.print(foo);
}
To JP the...

class A { }
public void creator1() {
new A();
}
public void creator2() {
class A { }
new A();
}
To JP these two statements...

What JavaSymbolSolver does?
JavaSymbolSolver resolves symbols in the JavaParser AST
package foo.bar;
class C {
D field;
}
...

Relationship JP & JSS
Certain methods in the AST requires additional intelligence.
myCallExpression.calculateResolvedType(...

Configuring JavaSymbolSolver
A typical usage:
CombinedTypeSolver typeSolver = new CombinedTypeSolver(
new ReflectionTypeSo...

Supporting code generation
We want to support people who has to generate code:
• Because they want to generate boilerplate...

JavaParser to generate code
CompilationUnit cu = new CompilationUnit();
cu.setPackageDeclaration("jpexample.model");
Class...

JavaParser to generate code
book.addConstructor(Modifier.PUBLIC)
.addParameter("String", "title")
.addParameter("Person", ...

JavaParser to generate code
book.addMethod("getTitle", Modifier.PUBLIC).setBody(
new BlockStmt().addStatement(
new ReturnS...

JavaParser to generate code
package jpexample.model;
public class Book {
String title;
Person author;
public Book(String t...

Supporting code analysis
We want to support people who have to analyse code:
• Because they want some metrics on code
• Be...

JavaParser to run queries
Question: How many methods take more than 3 parameters?
long n = getNodes(allCus, MethodDeclarat...

JavaParser to run queries
Question: What are the three top classes with most methods?
Answer: CoreMatchers: 35 methods
Bas...

JavaParser to run queries
Question: What is the class with most ancestors?
Answer: org.hamcrest.core.StringContains: org.h...

Supporting code refactoring
We want to support people who has to refactor code:
• Because they have to modernize legacy co...

JavaParser for automated
refactoring
getNodes(allCus, MethodCallExpr.class)
.stream()
.filter(m -> m.resolveInvokedMethod(...

JavaParser for automated
refactoring
public MethodCallExpr replaceCallsToOldMethod(
MethodCallExpr methodCall) {
MethodCal...

Some other features

Comments attribution
void foo() {
// comment1
int a =
1 + 2; // comment2
}
// comment1
int a =
1 + 2;
CompilationUnit cu =...

Lexical preservation
Pretty printing is good for new code but for existing code users
want lexical preservation.
It is tri...

Things we are considering

JavaParser to identify patterns
We are working on the Matcher library to reduce the complexity, it is in the early
stages
...

Java templates
We are discussing the idea of Java templates.
We would like to have Java code with placeholders for variabl...

Making Java extensible
Researchers (but also a certain company…) would be interested in
writing extensions for Java based ...

JavaParser: Visited
Book on JavaParser and JavaSymbolSolver,
from the core committers.
Avalaible for 0+ $
Currently 1.000+...

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