javaparser-testing/src/test/java/com/github/javaparser/ast/NodeTest.java - platform/external/javaparser - Git at Google

 /*
  * 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;

 import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
 import com.github.javaparser.ast.body.FieldDeclaration;
 import com.github.javaparser.ast.body.MethodDeclaration;
 import com.github.javaparser.ast.body.VariableDeclarator;
 import com.github.javaparser.ast.comments.BlockComment;
 import com.github.javaparser.ast.comments.Comment;
 import com.github.javaparser.ast.comments.JavadocComment;
 import com.github.javaparser.ast.comments.LineComment;
 import com.github.javaparser.ast.expr.Expression;
 import com.github.javaparser.ast.expr.IntegerLiteralExpr;
 import com.github.javaparser.ast.expr.SimpleName;
 import com.github.javaparser.ast.observer.AstObserver;
 import com.github.javaparser.ast.observer.AstObserverAdapter;
 import com.github.javaparser.ast.observer.ObservableProperty;
 import com.github.javaparser.ast.type.PrimitiveType;
 import org.junit.Test;

 import java.util.*;
 import java.util.stream.Collectors;

 import static com.github.javaparser.JavaParser.parse;
 import static com.github.javaparser.JavaParser.parseExpression;
 import static com.github.javaparser.utils.Utils.EOL;
 import static org.junit.Assert.*;

 public class NodeTest {

     @Test
     public void registerSubTree() {
         String code = "class A { int f; void foo(int p) { return 'z'; }}";
         CompilationUnit cu = parse(code);
         List<String> changes = new ArrayList<>();
         AstObserver observer = new AstObserverAdapter() {
             @Override
             public void propertyChange(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);

         cu.getClassByName("A").get().setName("MyCoolClass");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

         cu.getClassByName("MyCoolClass").get().getFieldByName("f").get().getVariable(0).setType(new PrimitiveType(PrimitiveType.Primitive.BOOLEAN));
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
                 "FieldDeclaration.maximum_common_type changed from int to boolean",
                 "VariableDeclarator.type changed from int to boolean"), changes);

         cu.getClassByName("MyCoolClass").get().getMethodsByName("foo").get(0).getParameterByName("p").get().setName("myParam");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
                 "FieldDeclaration.maximum_common_type changed from int to boolean",
                 "VariableDeclarator.type changed from int to boolean",
                 "Parameter.name changed from p to myParam"), changes);
     }

     @Test
     public void registerWithJustNodeMode() {
         String code = "class A { int f; void foo(int p) { return 'z'; }}";
         CompilationUnit cu = parse(code);
         List<String> changes = new ArrayList<>();
         AstObserver observer = new AstObserverAdapter() {
             @Override
             public void propertyChange(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.getClassByName("A").get().register(observer, Node.ObserverRegistrationMode.JUST_THIS_NODE);

         assertEquals(Arrays.asList(), changes);

         cu.getClassByName("A").get().setName("MyCoolClass");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

         cu.getClassByName("MyCoolClass").get().getFieldByName("f").get().getVariable(0).setType(new PrimitiveType(PrimitiveType.Primitive.BOOLEAN));
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

         cu.getClassByName("MyCoolClass").get().getMethodsByName("foo").get(0).getParameterByName("p").get().setName("myParam");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

         cu.getClassByName("MyCoolClass").get().addField("int", "bar").getVariables().get(0).setInitializer("0");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);
     }

     @Test
     public void registerWithNodeAndExistingDescendantsMode() {
         String code = "class A { int f; void foo(int p) { return 'z'; }}";
         CompilationUnit cu = parse(code);
         List<String> changes = new ArrayList<>();
         AstObserver observer = new AstObserverAdapter() {
             @Override
             public void propertyChange(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.getClassByName("A").get().register(observer, Node.ObserverRegistrationMode.THIS_NODE_AND_EXISTING_DESCENDANTS);

         assertEquals(Arrays.asList(), changes);

         cu.getClassByName("A").get().setName("MyCoolClass");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

         cu.getClassByName("MyCoolClass").get().getFieldByName("f").get().getVariable(0).setType(new PrimitiveType(PrimitiveType.Primitive.BOOLEAN));
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
                 "FieldDeclaration.maximum_common_type changed from int to boolean",
                 "VariableDeclarator.type changed from int to boolean"), changes);

         cu.getClassByName("MyCoolClass").get().getMethodsByName("foo").get(0).getParameterByName("p").get().setName("myParam");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
                 "FieldDeclaration.maximum_common_type changed from int to boolean",
                 "VariableDeclarator.type changed from int to boolean",
                 "Parameter.name changed from p to myParam"), changes);

         cu.getClassByName("MyCoolClass").get().addField("int", "bar").getVariables().get(0).setInitializer("0");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
                 "FieldDeclaration.maximum_common_type changed from int to boolean",
                 "VariableDeclarator.type changed from int to boolean",
                 "Parameter.name changed from p to myParam"), changes);
     }

     @Test
     public void registerWithSelfPropagatingMode() {
         String code = "class A { int f; void foo(int p) { return 'z'; }}";
         CompilationUnit cu = parse(code);
         List<String> changes = new ArrayList<>();
         AstObserver observer = new AstObserverAdapter() {
             @Override
             public void propertyChange(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.getClassByName("A").get().register(observer, Node.ObserverRegistrationMode.SELF_PROPAGATING);

         assertEquals(Arrays.asList(), changes);

         cu.getClassByName("A").get().setName("MyCoolClass");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

         cu.getClassByName("MyCoolClass").get().getFieldByName("f").get().getVariable(0).setType(new PrimitiveType(PrimitiveType.Primitive.BOOLEAN));
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
                 "FieldDeclaration.maximum_common_type changed from int to boolean",
                 "VariableDeclarator.type changed from int to boolean"), changes);

         cu.getClassByName("MyCoolClass").get().getMethodsByName("foo").get(0).getParameterByName("p").get().setName("myParam");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
                 "FieldDeclaration.maximum_common_type changed from int to boolean",
                 "VariableDeclarator.type changed from int to boolean",
                 "Parameter.name changed from p to myParam"), changes);

         cu.getClassByName("MyCoolClass").get()
                 .addField("int", "bar")
                 .getVariables().get(0).setInitializer("0");
         assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
                 "FieldDeclaration.maximum_common_type changed from int to boolean",
                 "VariableDeclarator.type changed from int to boolean",
                 "Parameter.name changed from p to myParam",
                 "VariableDeclarator.initializer changed from null to 0"), changes);
     }

     @Test
     public void deleteAParameterTriggerNotifications() {
         String code = "class A { void foo(int p) { }}";
         CompilationUnit cu = parse(code);
         List<String> changes = new ArrayList<>();
         AstObserver observer = new AstObserverAdapter() {

             @Override
             public void listChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved) {
                 changes.add("removing [" + nodeAddedOrRemoved + "] from index " + index);
             }
         };
         cu.register(observer, Node.ObserverRegistrationMode.SELF_PROPAGATING);

         cu.getClassByName("A").get().getMethodsByName("foo").get(0).getParameter(0).remove();
         assertEquals(Arrays.asList("removing [int p] from index 0"), changes);
     }

     @Test
     public void deleteClassNameDoesNotTriggerNotifications() {
         String code = "class A { void foo(int p) { }}";
         CompilationUnit cu = parse(code);
         List<String> changes = new ArrayList<>();
         AstObserver observer = new AstObserverAdapter() {

             @Override
             public void listChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved) {
                 changes.add("removing [" + nodeAddedOrRemoved + "] from index " + index);
             }
         };
         cu.register(observer, Node.ObserverRegistrationMode.SELF_PROPAGATING);

         // I cannot remove the name of a type
         assertEquals(false, cu.getClassByName("A").get().getName().remove());
         assertEquals(Arrays.asList(), changes);
     }

     @Test
     public void deleteMethodBodyDoesTriggerNotifications() {
         String code = "class A { void foo(int p) { }}";
         CompilationUnit cu = parse(code);
         List<String> changes = new ArrayList<>();
         AstObserver observer = new AstObserverAdapter() {

             @Override
             public void propertyChange(Node observedNode, ObservableProperty property, Object oldValue, Object newValue) {
                 changes.add("setting [" + property + "] to " + newValue);
             }

             @Override
             public void listChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved) {
                 changes.add("removing [" + nodeAddedOrRemoved + "] from index " + index);
             }
         };
         cu.register(observer, Node.ObserverRegistrationMode.SELF_PROPAGATING);

         assertEquals(true, cu.getClassByName("A").get().getMethodsByName("foo").get(0).getBody().get().remove());
         assertEquals(Arrays.asList("setting [BODY] to null"), changes);
     }

     @Test
     public void removeOrphanCommentPositiveCase() {
         ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class), false, "A");
         Comment c = new LineComment("A comment");
         decl.addOrphanComment(c);
         assertEquals(1, decl.getOrphanComments().size());
         assertTrue(decl == c.getParentNode().get());
         assertTrue(decl.removeOrphanComment(c));
         assertEquals(0, decl.getOrphanComments().size());
         assertFalse(c.getParentNode().isPresent());
     }

     @Test
     public void removeOrphanCommentNegativeCase() {
         ClassOrInterfaceDeclaration aClass = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class), false, "A");
         FieldDeclaration aField = new FieldDeclaration(EnumSet.noneOf(Modifier.class), new VariableDeclarator(PrimitiveType.intType(), "f"));
         aClass.getMembers().add(aField);
         Comment c = new LineComment("A comment");
         aField.addOrphanComment(c);
         // the comment is an orphan comment of the field, so trying to remove it on the class should not work
         assertFalse(aClass.removeOrphanComment(c));
         assertEquals(1, aField.getOrphanComments().size());
         assertTrue(c.getParentNode().isPresent());
     }

     @Test
     public void hasJavaDocCommentPositiveCaseWithSetJavaDocComment() {
         ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
                 false, "Foo");
         decl.setJavadocComment("A comment");
         assertEquals(true, decl.hasJavaDocComment());
     }

     @Test
     public void hasJavaDocCommentPositiveCaseWithSetComment() {
         ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
                 false, "Foo");
         decl.setComment(new JavadocComment("A comment"));
         assertEquals(true, decl.hasJavaDocComment());
     }

     @Test
     public void hasJavaDocCommentNegativeCaseNoComment() {
         ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
                 false, "Foo");
         assertEquals(false, decl.hasJavaDocComment());
     }

     @Test
     public void hasJavaDocCommentNegativeCaseLineComment() {
         ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
                 false, "Foo");
         decl.setComment(new LineComment("foo"));
         assertEquals(false, decl.hasJavaDocComment());
     }

     @Test
     public void hasJavaDocCommentNegativeCaseBlockComment() {
         ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
                 false, "Foo");
         decl.setComment(new BlockComment("foo"));
         assertEquals(false, decl.hasJavaDocComment());
     }

     @Test
     public void removeAllOnRequiredProperty() {
         CompilationUnit cu = parse("class X{ void x(){}}");
         MethodDeclaration methodDeclaration = cu.getType(0).getMethods().get(0);
         methodDeclaration.getName().removeForced();
         // Name is required, so to remove it the whole method is removed.
         assertEquals(String.format("class X {%1$s}%1$s", EOL), cu.toString());
     }

     @Test
     public void removingTheSecondOfAListOfIdenticalStatementsDoesNotMessUpTheParents() {
         CompilationUnit unit = parse(String.format("public class Example {%1$s" +
                 "  public static void example() {%1$s" +
                 "    boolean swapped;%1$s" +
                 "    swapped=false;%1$s" +
                 "    swapped=false;%1$s" +
                 "  }%1$s" +
                 "}%1$s", EOL));
         // remove the second swapped=false
         Node target = unit.getChildNodes().get(0).getChildNodes().get(1).getChildNodes().get(2).getChildNodes().get(2);
         target.remove();
         // This will throw an exception if the parents are bad.
         System.out.println(unit.toString());
     }

     @Test
     public void findCompilationUnit() {
         CompilationUnit cu = parse("class X{int x;}");
         VariableDeclarator x = cu.getClassByName("X").get().getMember(0).asFieldDeclaration().getVariables().get(0);
         assertEquals(cu, x.findCompilationUnit().get());
     }

     @Test
     public void findParent() {
         CompilationUnit cu = parse("class X{int x;}");
         SimpleName x = cu.getClassByName("X").get().getMember(0).asFieldDeclaration().getVariables().get(0).getName();
         assertEquals("int x;", x.findParent(FieldDeclaration.class).get().toString());
     }

     @Test
     public void cantFindCompilationUnit() {
         VariableDeclarator x = new VariableDeclarator();
         assertFalse(x.findCompilationUnit().isPresent());
     }

     @Test
     public void genericWalk() {
         Expression e = parseExpression("1+1");
         StringBuilder b = new StringBuilder();
         e.walk(n -> b.append(n.toString()));
         assertEquals("1 + 111", b.toString());
     }

     @Test
     public void classSpecificWalk() {
         Expression e = parseExpression("1+1");
         StringBuilder b = new StringBuilder();
         e.walk(IntegerLiteralExpr.class, n -> b.append(n.toString()));
         assertEquals("11", b.toString());
     }

     @Test
     public void conditionalFindAll() {
         Expression e = parseExpression("1+2+3");
         List<IntegerLiteralExpr> ints = e.findAll(IntegerLiteralExpr.class, n -> n.asInt() > 1);
         assertEquals("[2, 3]", ints.toString());
     }

     @Test
     public void typeOnlyFindAll() {
         Expression e = parseExpression("1+2+3");
         List<IntegerLiteralExpr> ints = e.findAll(IntegerLiteralExpr.class);
         assertEquals("[1, 2, 3]", ints.toString());
     }

     @Test
     public void typeOnlyFindAllMatchesSubclasses() {
         Expression e = parseExpression("1+2+3");
         List<Node> ints = e.findAll(Node.class);
         assertEquals("[1 + 2 + 3, 1 + 2, 1, 2, 3]", ints.toString());
     }

     @Test
     public void conditionalTypedFindFirst() {
         Expression e = parseExpression("1+2+3");
         Optional<IntegerLiteralExpr> ints = e.findFirst(IntegerLiteralExpr.class, n -> n.asInt() > 1);
         assertEquals("Optional[2]", ints.toString());
     }

     @Test
     public void typeOnlyFindFirst() {
         Expression e = parseExpression("1+2+3");
         Optional<IntegerLiteralExpr> ints = e.findFirst(IntegerLiteralExpr.class);
         assertEquals("Optional[1]", ints.toString());
     }

     @Test
     public void stream() {
         Expression e = parseExpression("1+2+3");
         List<IntegerLiteralExpr> ints = e.stream()
                 .filter(n -> n instanceof IntegerLiteralExpr)
                 .map(IntegerLiteralExpr.class::cast)
                 .filter(i -> i.asInt() > 1)
                 .collect(Collectors.toList());
         assertEquals("[2, 3]", ints.toString());
     }
 }
	/*
	* 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;

	import com.github.javaparser.ast.body.ClassOrInterfaceDeclaration;
	import com.github.javaparser.ast.body.FieldDeclaration;
	import com.github.javaparser.ast.body.MethodDeclaration;
	import com.github.javaparser.ast.body.VariableDeclarator;
	import com.github.javaparser.ast.comments.BlockComment;
	import com.github.javaparser.ast.comments.Comment;
	import com.github.javaparser.ast.comments.JavadocComment;
	import com.github.javaparser.ast.comments.LineComment;
	import com.github.javaparser.ast.expr.Expression;
	import com.github.javaparser.ast.expr.IntegerLiteralExpr;
	import com.github.javaparser.ast.expr.SimpleName;
	import com.github.javaparser.ast.observer.AstObserver;
	import com.github.javaparser.ast.observer.AstObserverAdapter;
	import com.github.javaparser.ast.observer.ObservableProperty;
	import com.github.javaparser.ast.type.PrimitiveType;
	import org.junit.Test;

	import java.util.*;
	import java.util.stream.Collectors;

	import static com.github.javaparser.JavaParser.parse;
	import static com.github.javaparser.JavaParser.parseExpression;
	import static com.github.javaparser.utils.Utils.EOL;
	import static org.junit.Assert.*;

	public class NodeTest {

	@Test
	public void registerSubTree() {
	String code = "class A { int f; void foo(int p) { return 'z'; }}";
	CompilationUnit cu = parse(code);
	List<String> changes = new ArrayList<>();
	AstObserver observer = new AstObserverAdapter() {
	@Override
	public void propertyChange(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);

	cu.getClassByName("A").get().setName("MyCoolClass");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

	cu.getClassByName("MyCoolClass").get().getFieldByName("f").get().getVariable(0).setType(new PrimitiveType(PrimitiveType.Primitive.BOOLEAN));
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
	"FieldDeclaration.maximum_common_type changed from int to boolean",
	"VariableDeclarator.type changed from int to boolean"), changes);

	cu.getClassByName("MyCoolClass").get().getMethodsByName("foo").get(0).getParameterByName("p").get().setName("myParam");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
	"FieldDeclaration.maximum_common_type changed from int to boolean",
	"VariableDeclarator.type changed from int to boolean",
	"Parameter.name changed from p to myParam"), changes);
	}

	@Test
	public void registerWithJustNodeMode() {
	String code = "class A { int f; void foo(int p) { return 'z'; }}";
	CompilationUnit cu = parse(code);
	List<String> changes = new ArrayList<>();
	AstObserver observer = new AstObserverAdapter() {
	@Override
	public void propertyChange(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.getClassByName("A").get().register(observer, Node.ObserverRegistrationMode.JUST_THIS_NODE);

	assertEquals(Arrays.asList(), changes);

	cu.getClassByName("A").get().setName("MyCoolClass");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

	cu.getClassByName("MyCoolClass").get().getFieldByName("f").get().getVariable(0).setType(new PrimitiveType(PrimitiveType.Primitive.BOOLEAN));
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

	cu.getClassByName("MyCoolClass").get().getMethodsByName("foo").get(0).getParameterByName("p").get().setName("myParam");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

	cu.getClassByName("MyCoolClass").get().addField("int", "bar").getVariables().get(0).setInitializer("0");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);
	}

	@Test
	public void registerWithNodeAndExistingDescendantsMode() {
	String code = "class A { int f; void foo(int p) { return 'z'; }}";
	CompilationUnit cu = parse(code);
	List<String> changes = new ArrayList<>();
	AstObserver observer = new AstObserverAdapter() {
	@Override
	public void propertyChange(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.getClassByName("A").get().register(observer, Node.ObserverRegistrationMode.THIS_NODE_AND_EXISTING_DESCENDANTS);

	assertEquals(Arrays.asList(), changes);

	cu.getClassByName("A").get().setName("MyCoolClass");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

	cu.getClassByName("MyCoolClass").get().getFieldByName("f").get().getVariable(0).setType(new PrimitiveType(PrimitiveType.Primitive.BOOLEAN));
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
	"FieldDeclaration.maximum_common_type changed from int to boolean",
	"VariableDeclarator.type changed from int to boolean"), changes);

	cu.getClassByName("MyCoolClass").get().getMethodsByName("foo").get(0).getParameterByName("p").get().setName("myParam");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
	"FieldDeclaration.maximum_common_type changed from int to boolean",
	"VariableDeclarator.type changed from int to boolean",
	"Parameter.name changed from p to myParam"), changes);

	cu.getClassByName("MyCoolClass").get().addField("int", "bar").getVariables().get(0).setInitializer("0");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
	"FieldDeclaration.maximum_common_type changed from int to boolean",
	"VariableDeclarator.type changed from int to boolean",
	"Parameter.name changed from p to myParam"), changes);
	}

	@Test
	public void registerWithSelfPropagatingMode() {
	String code = "class A { int f; void foo(int p) { return 'z'; }}";
	CompilationUnit cu = parse(code);
	List<String> changes = new ArrayList<>();
	AstObserver observer = new AstObserverAdapter() {
	@Override
	public void propertyChange(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.getClassByName("A").get().register(observer, Node.ObserverRegistrationMode.SELF_PROPAGATING);

	assertEquals(Arrays.asList(), changes);

	cu.getClassByName("A").get().setName("MyCoolClass");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass"), changes);

	cu.getClassByName("MyCoolClass").get().getFieldByName("f").get().getVariable(0).setType(new PrimitiveType(PrimitiveType.Primitive.BOOLEAN));
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
	"FieldDeclaration.maximum_common_type changed from int to boolean",
	"VariableDeclarator.type changed from int to boolean"), changes);

	cu.getClassByName("MyCoolClass").get().getMethodsByName("foo").get(0).getParameterByName("p").get().setName("myParam");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
	"FieldDeclaration.maximum_common_type changed from int to boolean",
	"VariableDeclarator.type changed from int to boolean",
	"Parameter.name changed from p to myParam"), changes);

	cu.getClassByName("MyCoolClass").get()
	.addField("int", "bar")
	.getVariables().get(0).setInitializer("0");
	assertEquals(Arrays.asList("ClassOrInterfaceDeclaration.name changed from A to MyCoolClass",
	"FieldDeclaration.maximum_common_type changed from int to boolean",
	"VariableDeclarator.type changed from int to boolean",
	"Parameter.name changed from p to myParam",
	"VariableDeclarator.initializer changed from null to 0"), changes);
	}

	@Test
	public void deleteAParameterTriggerNotifications() {
	String code = "class A { void foo(int p) { }}";
	CompilationUnit cu = parse(code);
	List<String> changes = new ArrayList<>();
	AstObserver observer = new AstObserverAdapter() {

	@Override
	public void listChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved) {
	changes.add("removing [" + nodeAddedOrRemoved + "] from index " + index);
	}
	};
	cu.register(observer, Node.ObserverRegistrationMode.SELF_PROPAGATING);

	cu.getClassByName("A").get().getMethodsByName("foo").get(0).getParameter(0).remove();
	assertEquals(Arrays.asList("removing [int p] from index 0"), changes);
	}

	@Test
	public void deleteClassNameDoesNotTriggerNotifications() {
	String code = "class A { void foo(int p) { }}";
	CompilationUnit cu = parse(code);
	List<String> changes = new ArrayList<>();
	AstObserver observer = new AstObserverAdapter() {

	@Override
	public void listChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved) {
	changes.add("removing [" + nodeAddedOrRemoved + "] from index " + index);
	}
	};
	cu.register(observer, Node.ObserverRegistrationMode.SELF_PROPAGATING);

	// I cannot remove the name of a type
	assertEquals(false, cu.getClassByName("A").get().getName().remove());
	assertEquals(Arrays.asList(), changes);
	}

	@Test
	public void deleteMethodBodyDoesTriggerNotifications() {
	String code = "class A { void foo(int p) { }}";
	CompilationUnit cu = parse(code);
	List<String> changes = new ArrayList<>();
	AstObserver observer = new AstObserverAdapter() {

	@Override
	public void propertyChange(Node observedNode, ObservableProperty property, Object oldValue, Object newValue) {
	changes.add("setting [" + property + "] to " + newValue);
	}

	@Override
	public void listChange(NodeList observedNode, ListChangeType type, int index, Node nodeAddedOrRemoved) {
	changes.add("removing [" + nodeAddedOrRemoved + "] from index " + index);
	}
	};
	cu.register(observer, Node.ObserverRegistrationMode.SELF_PROPAGATING);

	assertEquals(true, cu.getClassByName("A").get().getMethodsByName("foo").get(0).getBody().get().remove());
	assertEquals(Arrays.asList("setting [BODY] to null"), changes);
	}

	@Test
	public void removeOrphanCommentPositiveCase() {
	ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class), false, "A");
	Comment c = new LineComment("A comment");
	decl.addOrphanComment(c);
	assertEquals(1, decl.getOrphanComments().size());
	assertTrue(decl == c.getParentNode().get());
	assertTrue(decl.removeOrphanComment(c));
	assertEquals(0, decl.getOrphanComments().size());
	assertFalse(c.getParentNode().isPresent());
	}

	@Test
	public void removeOrphanCommentNegativeCase() {
	ClassOrInterfaceDeclaration aClass = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class), false, "A");
	FieldDeclaration aField = new FieldDeclaration(EnumSet.noneOf(Modifier.class), new VariableDeclarator(PrimitiveType.intType(), "f"));
	aClass.getMembers().add(aField);
	Comment c = new LineComment("A comment");
	aField.addOrphanComment(c);
	// the comment is an orphan comment of the field, so trying to remove it on the class should not work
	assertFalse(aClass.removeOrphanComment(c));
	assertEquals(1, aField.getOrphanComments().size());
	assertTrue(c.getParentNode().isPresent());
	}

	@Test
	public void hasJavaDocCommentPositiveCaseWithSetJavaDocComment() {
	ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
	false, "Foo");
	decl.setJavadocComment("A comment");
	assertEquals(true, decl.hasJavaDocComment());
	}

	@Test
	public void hasJavaDocCommentPositiveCaseWithSetComment() {
	ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
	false, "Foo");
	decl.setComment(new JavadocComment("A comment"));
	assertEquals(true, decl.hasJavaDocComment());
	}

	@Test
	public void hasJavaDocCommentNegativeCaseNoComment() {
	ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
	false, "Foo");
	assertEquals(false, decl.hasJavaDocComment());
	}

	@Test
	public void hasJavaDocCommentNegativeCaseLineComment() {
	ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
	false, "Foo");
	decl.setComment(new LineComment("foo"));
	assertEquals(false, decl.hasJavaDocComment());
	}

	@Test
	public void hasJavaDocCommentNegativeCaseBlockComment() {
	ClassOrInterfaceDeclaration decl = new ClassOrInterfaceDeclaration(EnumSet.noneOf(Modifier.class),
	false, "Foo");
	decl.setComment(new BlockComment("foo"));
	assertEquals(false, decl.hasJavaDocComment());
	}

	@Test
	public void removeAllOnRequiredProperty() {
	CompilationUnit cu = parse("class X{ void x(){}}");
	MethodDeclaration methodDeclaration = cu.getType(0).getMethods().get(0);
	methodDeclaration.getName().removeForced();
	// Name is required, so to remove it the whole method is removed.
	assertEquals(String.format("class X {%1$s}%1$s", EOL), cu.toString());
	}

	@Test
	public void removingTheSecondOfAListOfIdenticalStatementsDoesNotMessUpTheParents() {
	CompilationUnit unit = parse(String.format("public class Example {%1$s" +
	" public static void example() {%1$s" +
	" boolean swapped;%1$s" +
	" swapped=false;%1$s" +
	" swapped=false;%1$s" +
	" }%1$s" +
	"}%1$s", EOL));
	// remove the second swapped=false
	Node target = unit.getChildNodes().get(0).getChildNodes().get(1).getChildNodes().get(2).getChildNodes().get(2);
	target.remove();
	// This will throw an exception if the parents are bad.
	System.out.println(unit.toString());
	}

	@Test
	public void findCompilationUnit() {
	CompilationUnit cu = parse("class X{int x;}");
	VariableDeclarator x = cu.getClassByName("X").get().getMember(0).asFieldDeclaration().getVariables().get(0);
	assertEquals(cu, x.findCompilationUnit().get());
	}

	@Test
	public void findParent() {
	CompilationUnit cu = parse("class X{int x;}");
	SimpleName x = cu.getClassByName("X").get().getMember(0).asFieldDeclaration().getVariables().get(0).getName();
	assertEquals("int x;", x.findParent(FieldDeclaration.class).get().toString());
	}

	@Test
	public void cantFindCompilationUnit() {
	VariableDeclarator x = new VariableDeclarator();
	assertFalse(x.findCompilationUnit().isPresent());
	}

	@Test
	public void genericWalk() {
	Expression e = parseExpression("1+1");
	StringBuilder b = new StringBuilder();
	e.walk(n -> b.append(n.toString()));
	assertEquals("1 + 111", b.toString());
	}

	@Test
	public void classSpecificWalk() {
	Expression e = parseExpression("1+1");
	StringBuilder b = new StringBuilder();
	e.walk(IntegerLiteralExpr.class, n -> b.append(n.toString()));
	assertEquals("11", b.toString());
	}

	@Test
	public void conditionalFindAll() {
	Expression e = parseExpression("1+2+3");
	List<IntegerLiteralExpr> ints = e.findAll(IntegerLiteralExpr.class, n -> n.asInt() > 1);
	assertEquals("[2, 3]", ints.toString());
	}

	@Test
	public void typeOnlyFindAll() {
	Expression e = parseExpression("1+2+3");
	List<IntegerLiteralExpr> ints = e.findAll(IntegerLiteralExpr.class);
	assertEquals("[1, 2, 3]", ints.toString());
	}

	@Test
	public void typeOnlyFindAllMatchesSubclasses() {
	Expression e = parseExpression("1+2+3");
	List<Node> ints = e.findAll(Node.class);
	assertEquals("[1 + 2 + 3, 1 + 2, 1, 2, 3]", ints.toString());
	}

	@Test
	public void conditionalTypedFindFirst() {
	Expression e = parseExpression("1+2+3");
	Optional<IntegerLiteralExpr> ints = e.findFirst(IntegerLiteralExpr.class, n -> n.asInt() > 1);
	assertEquals("Optional[2]", ints.toString());
	}

	@Test
	public void typeOnlyFindFirst() {
	Expression e = parseExpression("1+2+3");
	Optional<IntegerLiteralExpr> ints = e.findFirst(IntegerLiteralExpr.class);
	assertEquals("Optional[1]", ints.toString());
	}

	@Test
	public void stream() {
	Expression e = parseExpression("1+2+3");
	List<IntegerLiteralExpr> ints = e.stream()
	.filter(n -> n instanceof IntegerLiteralExpr)
	.map(IntegerLiteralExpr.class::cast)
	.filter(i -> i.asInt() > 1)
	.collect(Collectors.toList());
	assertEquals("[2, 3]", ints.toString());
	}
	}