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/*
* 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.removenode;
import com.github.javaparser.JavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.body.VariableDeclarator;
import com.github.javaparser.ast.expr.Expression;
import com.github.javaparser.ast.expr.IntegerLiteralExpr;
import com.github.javaparser.ast.visitor.ModifierVisitor;
import java.io.FileInputStream;
public class ModifierVisitorTest {
public static void main(String... args) throws Exception {
// parse the file
CompilationUnit cu = JavaParser.parse(new FileInputStream("forGitHubTest.java"));
// The visitor should remove all a=20 variable declarations.
cu.accept(new MyVisitor(), null);
System.out.println(cu.toString());
}
}
class MyVisitor extends ModifierVisitor<Void> {
@Override
public Node visit(VariableDeclarator declarator, Void args) {
if (declarator.getNameAsString().equals("a")
// the initializer is optional, first check if there is one
&& declarator.getInitializer().isPresent()) {
Expression expression = declarator.getInitializer().get();
// We're looking for a literal integer.
if (expression instanceof IntegerLiteralExpr) {
// We found one. Is it literal integer 20?
if (((IntegerLiteralExpr) expression).getValue().equals("20")) {
// Returning null means "remove this VariableDeclarator"
return null;
}
}
}
return declarator;
}
}
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