javaparser-testing/src/test/java/com/github/javaparser/wiki_samples/MethodChanger_2.java

/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2016 The JavaParser Team.
 *
 * This file is part of JavaParser.
 *
 * JavaParser can be used either under the terms of
 * a) the GNU Lesser General Public License as published by
 *     the Free Software Foundation, either version 3 of the License, or
 *     (at your option) any later version.
 * b) the terms of the Apache License
 *
 * You should have received a copy of both licenses in LICENCE.LGPL and
 * LICENCE.APACHE. Please refer to those files for details.
 *
 * JavaParser is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * GNU Lesser General Public License for more details.
 */

package com.github.javaparser.wiki_samples;

import com.github.javaparser.JavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.NodeList;
import com.github.javaparser.ast.body.BodyDeclaration;
import com.github.javaparser.ast.body.MethodDeclaration;
import com.github.javaparser.ast.body.TypeDeclaration;

import java.io.FileInputStream;

import static com.github.javaparser.ast.type.PrimitiveType.intType;

public class MethodChanger_2 {

    public static void main(String[] args) throws Exception {
        // creates an input stream for the file to be parsed
        FileInputStream in = new FileInputStream("test.java");
        
        // parse the file
        CompilationUnit cu = JavaParser.parse(in);

        // change the methods names and parameters
        changeMethods(cu);

        // prints the changed compilation unit
        System.out.println(cu.toString());
    }

    private static void changeMethods(CompilationUnit cu) {
        // Go through all the types in the file
        NodeList<TypeDeclaration<?>> types = cu.getTypes();
        for (TypeDeclaration<?> type : types) {
            // Go through all fields, methods, etc. in this type
            NodeList<BodyDeclaration<?>> members = type.getMembers();
            for (BodyDeclaration<?> member : members) {
                if (member instanceof MethodDeclaration) {
                    MethodDeclaration method = (MethodDeclaration) member;
                    changeMethod(method);
                }
            }
        }
    }

    private static void changeMethod(MethodDeclaration n) {
        // change the name of the method to upper case
        n.setName(n.getNameAsString().toUpperCase());

        // create the new parameter
        n.addParameter(intType(), "value");
    }
}