import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
public void execute(PathResolver pathResolver) throws Exception {
    CompilationUnit cu = new CompilationUnit();
    cu.setPackage(new PackageDeclaration(ASTHelper.createNameExpr(pkgName)));
    cu.setImports(Arrays.asList(
            new ImportDeclaration(ASTHelper.createNameExpr("org.seasar.doma.jdbc.Config"), false, false),
            new ImportDeclaration(ASTHelper.createNameExpr("org.seasar.doma.jdbc.dialect.Dialect"), false, false),
            new ImportDeclaration(ASTHelper.createNameExpr("org.seasar.doma.jdbc.dialect.H2Dialect"), false, false),
            new ImportDeclaration(ASTHelper.createNameExpr("javax.sql.DataSource"), false, false)
    ));

    ClassOrInterfaceDeclaration type = new ClassOrInterfaceDeclaration(ModifierSet.PUBLIC, false, "DomaConfig");
    type.setImplements(Collections.singletonList(new ClassOrInterfaceType("Config")));
    ASTHelper.addTypeDeclaration(cu, type);


    MethodDeclaration getDataSourceMethod = new MethodDeclaration(ModifierSet.PUBLIC, ASTHelper.createReferenceType("DataSource", 0), "getDataSource");
    getDataSourceMethod.setAnnotations(Collections.singletonList(OVERRIDE_ANNOTATION));
    BlockStmt getDataSourceBody = new BlockStmt();
    ASTHelper.addStmt(getDataSourceBody, new ReturnStmt(new NullLiteralExpr()));
    getDataSourceMethod.setBody(getDataSourceBody);
    ASTHelper.addMember(type, getDataSourceMethod);

    MethodDeclaration getDialectMethod = new MethodDeclaration(ModifierSet.PUBLIC, ASTHelper.createReferenceType("Dialect", 0), "getDialect");
    getDialectMethod.setAnnotations(Collections.singletonList(OVERRIDE_ANNOTATION));
    BlockStmt getDialectBody = new BlockStmt();

    ObjectCreationExpr newDialect = new ObjectCreationExpr(null, new ClassOrInterfaceType("H2Dialect"), null);
    ASTHelper.addStmt(getDialectBody, new ReturnStmt(newDialect));
    getDialectMethod.setBody(getDialectBody);
    ASTHelper.addMember(type, getDialectMethod);

    try (OutputStreamWriter writer = new OutputStreamWriter(
            pathResolver.destinationAsStream(destination))) {
        writer.write(cu.toString());
    }
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override
public JCTree visit(final NullLiteralExpr n, final Object arg) {
    //ARG0: int tag
    TypeTag arg0 = TypeTag.BOT;

    //ARG1: Object value
    Object arg1 = null;

    return new AJCLiteral(make.Literal(arg0, arg1), ((n.getComment() != null) ? n.getComment().getContent() : null));
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override
public Node visit(NullLiteralExpr _n, Object _arg) {
	Comment comment = cloneNodes(_n.getComment(), _arg);

	NullLiteralExpr r = new NullLiteralExpr(_n.getRange());
	r.setComment(comment);
	return r;
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override
public void visit(NullLiteralExpr n, Script arg) {
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override
public void visit(final NullLiteralExpr n, final Object arg) {
    printer.printLn("NullLiteralExpr");
    printJavaComment(n.getComment(), arg);
    printer.print("null");
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override public NullLiteralExpr doMerge(NullLiteralExpr first, NullLiteralExpr second) {
  NullLiteralExpr nle = new NullLiteralExpr();

  return nle;
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override public boolean doIsEquals(NullLiteralExpr first, NullLiteralExpr second) {
  return true;
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override public Node visit(final NullLiteralExpr n, final A arg) {
	return n;
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override
public Expression getDefaultValue(String defaultValue) {
  return new NullLiteralExpr();
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override public Boolean visit(final NullLiteralExpr n1, final Node arg) {
	return true;
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override public void visit(final NullLiteralExpr n, final A arg) {
	visitComment(n.getComment(), arg);
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override public Node visit(final NullLiteralExpr n, final A arg) {
	visitComment(n, arg);
	return n;
}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override
public void visit(final NullLiteralExpr n, final Context ctx) {
  visitNode(n, ctx);
  super.visit(n, ctx);

}
 

import com.github.javaparser.ast.expr.NullLiteralExpr; //导入依赖的package包/类
@Override
public void visit(NullLiteralExpr n, Void arg) {
    out.println("NullLiteralExpr: " + (extended ? n : n));
    super.visit(n, arg);
}