javaparser-testing/src/test/java/com/github/javaparser/ast/observer/PropagatingAstObserverTest.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.ast.observer;

import com.github.javaparser.JavaParser;
import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.body.FieldDeclaration;
import org.junit.Test;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;

import static org.junit.Assert.assertEquals;

public class PropagatingAstObserverTest {
    @Test
    public void verifyPropagation() {
        String code = "class A {  }";
        CompilationUnit cu = JavaParser.parse(code);
        List<String> changes = new ArrayList<>();
        AstObserver observer = new PropagatingAstObserver() {
            @Override
            public void concretePropertyChange(Node observedNode, ObservableProperty property, Object oldValue, Object newValue) {
                changes.add(String.format("%s.%s changed from %s to %s", observedNode.getClass().getSimpleName(), property.name().toLowerCase(), oldValue, newValue));
            }
        };
        cu.registerForSubtree(observer);

        assertEquals(Arrays.asList(), changes);

        FieldDeclaration fieldDeclaration = cu.getClassByName("A").get().addField("String", "foo");
        assertEquals(Arrays.asList(), changes);
        assertEquals(true, fieldDeclaration.isRegistered(observer));

        cu.getClassByName("A").get().getFieldByName("foo").get().getVariables().get(0).setName("Bar");
        assertEquals(Arrays.asList("VariableDeclarator.name changed from foo to Bar"), changes);
    }
}