C#•13mo ago

❔ ✅ How to create builder?

I'd like to create builder which should look smth like that:

var schema = new SchemaBuilder()
  .StartGroup("first group")
    .AddText()
  .EndGroup()
  .StartGroup("second group")
    .AddText()
  .EndGroup()

var schema = new SchemaBuilder()
  .StartGroup("first group")
    .AddText()
  .EndGroup()
  .StartGroup("second group")
    .AddText()
  .EndGroup()

I know how to create builder but I don't understand how to create "groups". All objects inside .StartGroup()... .EndGroup() should have group name How to do it?

6 Replies

Thinker•13mo ago

StartGroup could returns a new GroupBuilder object which has the name of the group in it. The group object also has a reference to the original SchemaBuilder which is returned when calling EndGroup.

class SchemaBuilder
{
    private readonly List<GroupBuilder> groups = new();

    public GroupBuilder StartGroup(string name)
    {
        var group = new GroupBuilder(this, name);
        groups.Add(group);
        return group;
    }
}

class GroupBuilder
{
    private readonly SchemaBuilder schemaBuilder;
    private readonly string name;
    
    public GroupBuilder(SchemaBuilder schemaBuilder, string name)
    {
        this.schemaBuilder = schemaBuilder;
        this.name = name;
    }

    public GroupBuilder AddText()
    {
        // stuff

        return this;
    }

    public SchemaBuilder EndGroup() => schemaBuilder;
}

var schema = new SchemaBuilder()
    .StartGroup("first group")
        .AddText()
    .EndGroup()
    .StartGroup("second group")
        .AddText()
    .EndGroup();

class SchemaBuilder
{
    private readonly List<GroupBuilder> groups = new();

    public GroupBuilder StartGroup(string name)
    {
        var group = new GroupBuilder(this, name);
        groups.Add(group);
        return group;
    }
}

class GroupBuilder
{
    private readonly SchemaBuilder schemaBuilder;
    private readonly string name;
    
    public GroupBuilder(SchemaBuilder schemaBuilder, string name)
    {
        this.schemaBuilder = schemaBuilder;
        this.name = name;
    }

    public GroupBuilder AddText()
    {
        // stuff

        return this;
    }

    public SchemaBuilder EndGroup() => schemaBuilder;
}

var schema = new SchemaBuilder()
    .StartGroup("first group")
        .AddText()
    .EndGroup()
    .StartGroup("second group")
        .AddText()
    .EndGroup();

SWEETPONY•13mo ago

didn't think about second builder may I ask a question is it ok to put GroupBuilder inside SchemaBuilder?

Thinker•13mo ago

As a nested class? sure ig

SWEETPONY•13mo ago

thanks for helping!

Chairman Meow•13mo ago

I would tackle this with another approach. Instead of using two builders and a list to store them, I'd just use one builder and a dictionary/map that has the keys set to the group name.

Accord•13mo ago

Was this issue resolved? If so, run /close - otherwise I will mark this as stale and this post will be archived until there is new activity.

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❔ ✅ How to create builder?