GenericVisitorAdapter.java

/*
 * Copyright (C) 2007-2010 Júlio Vilmar Gesser.
 * Copyright (C) 2011, 2013-2015 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.visitor;

import com.github.javaparser.ast.CompilationUnit;
import com.github.javaparser.ast.ImportDeclaration;
import com.github.javaparser.ast.Node;
import com.github.javaparser.ast.PackageDeclaration;
import com.github.javaparser.ast.TypeParameter;
import com.github.javaparser.ast.body.*;
import com.github.javaparser.ast.comments.BlockComment;
import com.github.javaparser.ast.comments.JavadocComment;
import com.github.javaparser.ast.comments.LineComment;
import com.github.javaparser.ast.expr.*;
import com.github.javaparser.ast.stmt.*;
import com.github.javaparser.ast.type.*;
import xapi.collect.X_Collect;
import xapi.fu.In3Out1;
import xapi.fu.Out1;

import java.util.Iterator;

/**
 * @author Julio Vilmar Gesser
 */
public abstract class GenericVisitorAdapter<R, A> implements GenericVisitor<R, A> {

	@Override
	public R visit(final AnnotationDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getMembers() != null) {
			for (final BodyDeclaration member : n.getMembers()) {
				{
					R result = member.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final AnnotationMemberDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getDefaultValue() != null) {
			{
				R result = n.getDefaultValue().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ArrayAccessExpr n, final A arg) {
		{
			R result = n.getName().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getIndex().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final ArrayCreationExpr n, final A arg) {
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getDimensions() != null) {
			for (final Expression dim : n.getDimensions()) {
				{
					R result = dim.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		} else {
			{
				R result = n.getInitializer().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ArrayInitializerExpr n, final A arg) {
		if (n.getValues() != null) {
			for (final Expression expr : n.getValues()) {
				{
					R result = expr.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final AssertStmt n, final A arg) {
		{
			R result = n.getCheck().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getMessage() != null) {
			{
				R result = n.getMessage().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final AssignExpr n, final A arg) {
		{
			R result = n.getTarget().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getValue().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final BinaryExpr n, final A arg) {
		{
			R result = n.getLeft().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getRight().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final BlockStmt n, final A arg) {
		if (n.getStmts() != null) {
			for (final Statement s : n.getStmts()) {
				{
					R result = s.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;

	}

	@Override
	public R visit(final BooleanLiteralExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final BreakStmt n, final A arg) {
		return null;
	}

	@Override
	public R visit(final CastExpr n, final A arg) {
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getExpr().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final CatchClause n, final A arg) {
		{
			R result = n.getParam().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getCatchBlock().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;

	}

	@Override
	public R visit(final CharLiteralExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final ClassExpr n, final A arg) {
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final ClassOrInterfaceDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getTypeParameters() != null) {
			for (final TypeParameter t : n.getTypeParameters()) {
				{
					R result = t.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getExtends() != null) {
			for (final ClassOrInterfaceType c : n.getExtends()) {
				{
					R result = c.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}

		if (n.getImplements() != null) {
			for (final ClassOrInterfaceType c : n.getImplements()) {
				{
					R result = c.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getMembers() != null) {
			for (final BodyDeclaration member : n.getMembers()) {
				{
					R result = member.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ClassOrInterfaceType n, final A arg) {
		if (n.getScope() != null) {
			{
				R result = n.getScope().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getTypeArgs() != null) {
			for (final Type t : n.getTypeArgs()) {
				{
					R result = t.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final CompilationUnit n, final A arg) {
		if (n.getPackage() != null) {
			{
				R result = n.getPackage().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getImports() != null) {
			for (final ImportDeclaration i : n.getImports()) {
				{
					R result = i.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getTypes() != null) {
			for (final TypeDeclaration typeDeclaration : n.getTypes()) {
				{
					R result = typeDeclaration.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ConditionalExpr n, final A arg) {
		{
			R result = n.getCondition().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getThenExpr().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getElseExpr().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final ConstructorDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getTypeParameters() != null) {
			for (final TypeParameter t : n.getTypeParameters()) {
				{
					R result = t.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getParameters() != null) {
			for (final Parameter p : n.getParameters()) {
				{
					R result = p.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getThrows() != null) {
			for (final NameExpr name : n.getThrows()) {
				{
					R result = name.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getBlock().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final ContinueStmt n, final A arg) {
		return null;
	}

	@Override
	public R visit(final DoStmt n, final A arg) {
		{
			R result = n.getBody().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getCondition().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final DoubleLiteralExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final EmptyMemberDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final EmptyStmt n, final A arg) {
		return null;
	}

	@Override
	public R visit(final EmptyTypeDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final EnclosedExpr n, final A arg) {
		{
			R result = n.getInner().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final EnumConstantDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getArgs() != null) {
			for (final Expression e : n.getArgs()) {
				{
					R result = e.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getClassBody() != null) {
			for (final BodyDeclaration member : n.getClassBody()) {
				{
					R result = member.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final EnumDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getImplements() != null) {
			for (final ClassOrInterfaceType c : n.getImplements()) {
				{
					R result = c.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getEntries() != null) {
			for (final EnumConstantDeclaration e : n.getEntries()) {
				{
					R result = e.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getMembers() != null) {
			for (final BodyDeclaration member : n.getMembers()) {
				{
					R result = member.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ExplicitConstructorInvocationStmt n, final A arg) {
		if (!n.isThis()) {
			if (n.getExpr() != null) {
				{
					R result = n.getExpr().accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getTypeArgs() != null) {
			for (final Type t : n.getTypeArgs()) {
				{
					R result = t.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getArgs() != null) {
			for (final Expression e : n.getArgs()) {
				{
					R result = e.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ExpressionStmt n, final A arg) {
		{
			R result = n.getExpression().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final FieldAccessExpr n, final A arg) {
		{
			R result = n.getScope().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final FieldDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		for (final VariableDeclarator var : n.getVariables()) {
			{
				R result = var.accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ForeachStmt n, final A arg) {
		{
			R result = n.getVariable().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getIterable().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getBody().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final ForStmt n, final A arg) {
		if (n.getInit() != null) {
			for (final Expression e : n.getInit()) {
				{
					R result = e.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getCompare() != null) {
			{
				R result = n.getCompare().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getUpdate() != null) {
			for (final Expression e : n.getUpdate()) {
				{
					R result = e.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getBody().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final IfStmt n, final A arg) {
		{
			R result = n.getCondition().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getThenStmt().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getElseStmt() != null) {
			{
				R result = n.getElseStmt().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ImportDeclaration n, final A arg) {
		{
			R result = n.getName().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final InitializerDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		{
			R result = n.getBlock().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final InstanceOfExpr n, final A arg) {
		{
			R result = n.getExpr().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final IntegerLiteralExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final IntegerLiteralMinValueExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final JavadocComment n, final A arg) {
		return null;
	}

	@Override
	public R visit(final LabeledStmt n, final A arg) {
		{
			R result = n.getStmt().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final LongLiteralExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final LongLiteralMinValueExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final MarkerAnnotationExpr n, final A arg) {
		{
			R result = n.getName().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final MemberValuePair n, final A arg) {
		{
			R result = n.getValue().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final MethodCallExpr n, final A arg) {
		if (n.getScope() != null) {
			{
				R result = n.getScope().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getTypeArgs() != null) {
			for (final Type t : n.getTypeArgs()) {
				{
					R result = t.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getArgs() != null) {
			for (final Expression e : n.getArgs()) {
				{
					R result = e.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final MethodDeclaration n, final A arg) {
		if (n.getJavaDoc() != null) {
			{
				R result = n.getJavaDoc().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getTypeParameters() != null) {
			for (final TypeParameter t : n.getTypeParameters()) {
				{
					R result = t.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getParameters() != null) {
			for (final Parameter p : n.getParameters()) {
				{
					R result = p.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getThrows() != null) {
			for (final ReferenceType name : n.getThrows()) {
				{
					R result = name.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getBody() != null) {
			{
				R result = n.getBody().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final NameExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final NormalAnnotationExpr n, final A arg) {
		{
			R result = n.getName().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getPairs() != null) {
			for (final MemberValuePair m : n.getPairs()) {
				{
					R result = m.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final NullLiteralExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final ObjectCreationExpr n, final A arg) {
		if (n.getScope() != null) {
			{
				R result = n.getScope().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getTypeArgs() != null) {
			for (final Type t : n.getTypeArgs()) {
				{
					R result = t.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getArgs() != null) {
			for (final Expression e : n.getArgs()) {
				{
					R result = e.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getAnonymousClassBody() != null) {
			for (final BodyDeclaration member : n.getAnonymousClassBody()) {
				{
					R result = member.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final PackageDeclaration n, final A arg) {
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getName().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final Parameter n, final A arg) {
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getId().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final MultiTypeParameter n, final A arg) {
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			if (n.getType() != null) {
				R result = n.getType().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		{
			R result = n.getId().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final PrimitiveType n, final A arg) {
		return null;
	}

	@Override
	public R visit(final QualifiedNameExpr n, final A arg) {
		{
			R result = n.getQualifier().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final ReferenceType n, final A arg) {
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

    @Override
    public R visit(final IntersectionType n, final A arg) {
        {
            for (ReferenceType element : n.getElements()) {
                R result = element.accept(this, arg);
                if (result != null) {
                    return result;
                }
            }
        }
        return null;
    }

    @Override
    public R visit(final UnionType n, final A arg) {
        {
            for (ReferenceType element : n.getElements()) {
                R result = element.accept(this, arg);
                if (result != null) {
                    return result;
                }
            }
        }
        return null;
    }

	@Override
	public R visit(final ReturnStmt n, final A arg) {
		if (n.getExpr() != null) {
			{
				R result = n.getExpr().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final SingleMemberAnnotationExpr n, final A arg) {
		{
			R result = n.getName().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getMemberValue().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final StringLiteralExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final TemplateLiteralExpr n, final A arg) {
		return null;
	}

	@Override
	public R visit(final SuperExpr n, final A arg) {
		if (n.getClassExpr() != null) {
			{
				R result = n.getClassExpr().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final SwitchEntryStmt n, final A arg) {
		if (n.getLabel() != null) {
			{
				R result = n.getLabel().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getStmts() != null) {
			for (final Statement s : n.getStmts()) {
				{
					R result = s.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final SwitchStmt n, final A arg) {
		{
			R result = n.getSelector().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getEntries() != null) {
			for (final SwitchEntryStmt e : n.getEntries()) {
				{
					R result = e.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;

	}

	@Override
	public R visit(final SynchronizedStmt n, final A arg) {
		{
			if (n.getExpr() != null) {
			    R result = n.getExpr().accept(this, arg);
			    if (result != null) {
				    return result;
			    }
			}
		}
		{
			R result = n.getBlock().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final ThisExpr n, final A arg) {
		if (n.getClassExpr() != null) {
			{
				R result = n.getClassExpr().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final ThrowStmt n, final A arg) {
		{
			R result = n.getExpr().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final TryStmt n, final A arg) {
		if (n.getResources() != null) {
			for (final VariableDeclarationExpr v : n.getResources()) {
				{
					R result = v.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getTryBlock().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getCatchs() != null) {
			for (final CatchClause c : n.getCatchs()) {
				{
					R result = c.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		if (n.getFinallyBlock() != null) {
			{
				R result = n.getFinallyBlock().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final TypeDeclarationStmt n, final A arg) {
		{
			R result = n.getTypeDeclaration().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final TypeParameter n, final A arg) {
		if (n.getTypeBound() != null) {
			for (final ClassOrInterfaceType c : n.getTypeBound()) {
				{
					R result = c.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final UnaryExpr n, final A arg) {
		{
			R result = n.getExpr().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final UnknownType n, final A arg) {
		return null;
	}

	@Override
	public R visit(final VariableDeclarationExpr n, final A arg) {
		if (n.getAnnotations() != null) {
			for (final AnnotationExpr a : n.getAnnotations()) {
				{
					R result = a.accept(this, arg);
					if (result != null) {
						return result;
					}
				}
			}
		}
		{
			R result = n.getType().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		for (final VariableDeclarator v : n.getVars()) {
			{
				R result = v.accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final VariableDeclarator n, final A arg) {
		{
			R result = n.getId().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		if (n.getInit() != null) {
			{
				R result = n.getInit().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

	@Override
	public R visit(final VariableDeclaratorId n, final A arg) {
		return null;
	}

	@Override
	public R visit(final VoidType n, final A arg) {
		return null;
	}

	@Override
	public R visit(final WhileStmt n, final A arg) {
		{
			R result = n.getCondition().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		{
			R result = n.getBody().accept(this, arg);
			if (result != null) {
				return result;
			}
		}
		return null;
	}

	@Override
	public R visit(final WildcardType n, final A arg) {
		if (n.getExtends() != null) {
			{
				R result = n.getExtends().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		if (n.getSuper() != null) {
			{
				R result = n.getSuper().accept(this, arg);
				if (result != null) {
					return result;
				}
			}
		}
		return null;
	}

    @Override
    public R visit(LambdaExpr n, A arg) {
        return null;
    }

    @Override
    public R visit(MethodReferenceExpr n, A arg){
        return null;
    }

    @Override
    public R visit(TypeExpr n, A arg){
        return null;
    }

    @Override
    public R visit(final BlockComment n, final A arg) {
        return null;
    }

    @Override
    public R visit(final LineComment n, final A arg) {
        return null;
    }

    @Override
    public R visit(UiAttrExpr n, A arg) {
        R result = n.getName().accept(this, arg);
        if (result != null) {
            return result;
        }
        result = n.getExpression().accept(this, arg);
        return result;
    }

    @Override
    public R visit(UiContainerExpr n, A arg) {
        R result = n.getNameExpr().accept(this, arg);
        if (result != null) {
            return result;
        }
        for (UiAttrExpr uiAttrExpr : n.getAttributes()) {
            result = uiAttrExpr.accept(this, arg);
            if (result != null) {
                return result;
            }
        }
        if (n.getBody() != null) {
            result = n.getBody().accept(this, arg);
        }
        return result;
    }

    @Override
    public R visit(UiBodyExpr n, A arg) {
        if (n.getChildren() != null) {
            for (UiExpr uiExpr : n.getChildren()) {
                final R result = uiExpr.accept(this, arg);
                if (result != null) {
                    return result;
                }
            }
        }
        return null;
    }

    @Override
    public R visit(JsonContainerExpr n, A arg) {
        return checkAllItems(arg, JsonPairExpr::accept, n.getPairs());
    }

    @Override
    public R visit(JsonPairExpr n, A arg) {
        return checkExpression(arg, n.getKeyExpr(),
            ()-> checkExpression(arg, n.getValueExpr()));
    }

    @Override
    public R visit(CssBlockExpr n, A arg) {
        return checkAllItems(arg, CssContainerExpr::accept, n.getContainers());
    }

    @Override
    public R visit(CssContainerExpr n, A arg) {
        return checkAllItems(arg, CssSelectorExpr::accept, n.getSelectors(),
            ()-> checkAllItems(arg, CssRuleExpr::accept, n.getRules()
        ));
    }

    @Override
    public R visit(CssRuleExpr n, A arg) {
        return checkExpression(arg, n.getKey(),
            ()->checkExpression(arg, n.getValue()));
    }

    @Override
    public R visit(CssSelectorExpr n, A arg) {
        return null;
    }

    @Override
    public R visit(CssValueExpr n, A arg) {
        return checkExpression(arg, n.getValue());
    }

    protected <N extends Node> R checkItems(A arg, In3Out1<N, GenericVisitor<R, A>, A, R> mapper, Iterable<N> nodes, Out1<R> ifNull) {
        R result = checkAllItems(arg, mapper, nodes);
        if (result == null) {
            return ifNull.out1();
        }
        return result;
    }

    protected <N extends Node> R checkItem(A arg, In3Out1<N, GenericVisitor<R, A>, A, R> mapper, N node, Out1<R> ifNull) {
        if (node != null) {
            R result = mapper.io(node, this, arg);
            if (result == null) {
                return ifNull.out1();
            }
        }
        return null;
    }

    protected R checkExpression(A arg, Expression node) {
        if (node != null) {
            return node.accept(this, arg);
        }
        return null;
    }
    protected R checkExpression(A arg, Expression node, Out1<R> ifNull) {
        if (node != null) {
            R result = node.accept(this, arg);
            if (result == null) {
                return ifNull.out1();
            }
        }
        return null;
    }

    protected <N extends Node> R checkItems(A arg, In3Out1<N, GenericVisitor<R, A>, A, R> mapper, N... nodes) {
        return checkAllItems(arg, mapper, X_Collect.arrayIterable(nodes));
    }

    protected <N extends Node> R checkAllItems(A arg, In3Out1<N, GenericVisitor<R, A>, A, R> mapper, Iterable<N> nodes, Out1<R> ifNull) {
        final R result = checkAllItems(arg, mapper, nodes);
        if (result == null) {
            return ifNull.out1();
        }
        return result;
    }
    protected <N extends Node> R checkAllItems(A arg, In3Out1<N, GenericVisitor<R, A>, A, R> mapper, Iterable<N> nodes) {
        if (nodes == null) {
            return null;
        }
        final Iterator<N> itr = nodes.iterator();
        while (itr.hasNext()) {
            final N node = itr.next();
            if (node != null) {
                return mapper.io(node, this, arg);
            }
        }
        return null;
    }
}