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Castle coding standards

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Modified on 2011/08/24 08:56 by Jan Wilson Categorized as Uncategorized

Introduction

The following establishes the basis of Castle coding standard. Please, be a nice guy and follow this. Also fix all different usages on the code base.

Image
Resharper settings

If you're a ReSharper user, make sure you're using the shared team settings available with the solution. This will allow you to use clean up command which applies most of the rules outlined below automatically.

Indentation

It was recently discussed and decided that all files (source code, xml and html) must use tabs for indentation. If you use ReSharper, it will probably configure itself to match this when you open a project solution from Castle source repository.

Header

The license header is not optional. Every source file must include it, including test cases. No exceptions.
// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

Source file layout

Each .cs file should try to follow this layout:
HEADER (see above)

namespace <namespacename>
{
  imports grouped and each group separated by a new line

  public class <classname>
  {
  }
}

For example:
// Copyright 2004-2011 Castle Project - http://www.castleproject.org/
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
//     http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.

namespace Castle.ActiveRecord
{
    using System;
    using System.Collections;

    using Castle.ActiveRecord.Framework;
    using Castle.ActiveRecord.Queries;

    using NHibernate;
    using NHibernate.Expression;

    /// <summary>
    /// Allow custom executions using the NHibernate's ISession.
    /// </summary>
    public delegate object NHibernateDelegate(ISession session, object instance);

    /// <summary>
    /// Base class for all ActiveRecord classes. Implements
    /// all the functionality to simplify the code on the
    /// subclasses.
    /// </summary>
    [Serializable]
    public abstract class ActiveRecordBase : ActiveRecordHooksBase
    {
        protected internal static ISessionFactoryHolder holder;

...

Type Members

Group members by their types and access levels.
  1. static and readonly fields (public, protected, private in this order)
  2. Instance fields (public, protected, private in this order)
  3. Member declarations
    1. Constructors (public, protected, private in this order)
    2. Methods and Properties (grouped by their access level or interface implementation)
    3. static members and private members at the end

Nested classes should be on the end or within a region that explains/groups the feature

[Serializable]
public class SomeClass : BaseClass, IInterface
{
    private static readonly int SomeReadonlyFieldConstant = 1;

    private String something;
    private String else;

    public SomeClass()
    {
    }

    protected SomeClass(int someArgument) : this()
    {
    }

    public void SomeMember()
    {
        ...
    }

    #region IInterface Members

    public void DoSomething()
    {
        ...
    }

    #endregion

    protected void SomeProtectedMethod()
    {
        ...
    }

    protected String PropertyX
    {
        ...
    }

    private void SomePrivateMethod()
    {
    }

}

Blocks

Braces on new line:
public void MyMethod()
{
  if (something)
  {
  }
}
You can skip braces for branch control statements like exit, break and continue. In this case put the branch on the same line of the if, and use that only if the if statement is really simple.

Example:
private void PopulateConfigNodes(XmlNode section)
{
    foreach(XmlNode node in section.ChildNodes)
    {
        if (node.NodeType != XmlNodeType.Element) continue;

        if (!Config_Node_Name.Equals(node.Name))
        {
            String message = String.Format("Unexpected node. Expect '{0}' found '{1}'", Config_Node_Name, node.Name);
...

Properties

Prefer the short form for simple properties:
public String Name
{
  get { return name; }
  set { value = value; }
}
However, if the property is more complex than that, use the standard form:
public String Name
{
  get
  {
   if (something)
   {
     return name;
   }
   return null;
  }
  set { value = value; }
}

Fields

Group them in some logical order. static fields first, then the public fields (which by the way should be avoided), then protected, then private.

Constants

Prefer a meaningful name, even if it's longer.
private static readonly int DefaultSmtpPort = 22;

Static and instance fields

private static int name;

private int port;

Others

String

Prefer String instead of string, although this is not required.

C style code

Avoid it like hell. Code like the following should not be on the code base:
public static Array BuildObjectArray(Type t, IEnumerable list, bool distinct)
{
    Set s = (distinct ? new ListSet() : null);

    ICollection c = list as ICollection;
    IList newList = c != null ? new ArrayList(c.Count) : new ArrayList();
    foreach (object o in list)
    {
        object[] p = (o is object[] ? (object[]) o : new object[] {o});
        object el = Activator.CreateInstance(t, p);
        if (s == null || s.Add(el))
            newList.Add(el);
    }

    Array a = Array.CreateInstance(t, newList.Count);
    newList.CopyTo(a, 0);
    return a;
}
Brevity is good, but at least a minimum of meaningful names is also desirable. Try to combine them to create something like:
public static Array BuildObjectArray(Type type, IEnumerable list, bool distinct)
{
    Set set = (distinct ? new ListSet() : null);

    ICollection coll = list as ICollection;
    IList newList = coll != null ? new ArrayList(coll.Count) : new ArrayList();

    foreach (object item in list)
    {
        object[] p = (item is object[] ? (object[]) item : new object[] {item});
        object el = Activator.CreateInstance(type, p);

        if (set == null || set.Add(el))
        {
            newList.Add(el);
        }
    }

    Array a = Array.CreateInstance(type, newList.Count);
    newList.CopyTo(a, 0);
    return a;
}

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