/// <summary>
/// The helper method which returns the HAL build factory that can build the HAL with the <see cref="IPagedResult"/>
/// object.
/// </summary>
/// <param name="context">The <see cref="HalBuildContext"/> object that carries the information for creating
/// the HAL builder.</param>
/// <returns>The <see cref="IBuilder"/> object which can build a HAL data structure.</returns>
protected IBuilder GetPagedResultHalBuildFactory(HalBuildContext context)
{
var state = (IPagedResult)context.State;
var pageSize = state.PageSize;
var pageNumber = state.PageNumber;
var totalRecords = state.TotalRecords;
var totalPages = state.TotalPages;
var selfLinkItem = context.HttpContext.Request.GetEncodedUrl();
string prevLinkItem = null;
if (pageNumber > 1 && pageNumber <= totalPages)
{
prevLinkItem = GenerateLink(context.HttpContext.Request, new Dictionary <string, StringValues> {
{ "page", (pageNumber - 1).ToString() }
});
}
string nextLinkItem = null;
if (pageNumber < totalPages)
{
nextLinkItem = GenerateLink(context.HttpContext.Request, new Dictionary <string, StringValues> {
{ "page", (pageNumber + 1).ToString() }
});
}
var linkItemBuilder = new ResourceBuilder()
.WithState(new { pageNumber, pageSize, totalRecords, totalPages })
.AddSelfLink().WithLinkItem(selfLinkItem);
if (!string.IsNullOrEmpty(prevLinkItem))
{
linkItemBuilder = linkItemBuilder.AddLink("prev").WithLinkItem(prevLinkItem);
}
if (!string.IsNullOrEmpty(nextLinkItem))
{
linkItemBuilder = linkItemBuilder.AddLink("next").WithLinkItem(nextLinkItem);
}
var embeddedResourceName = context.ControllerAction.ControllerName.ToLower();
var attribute = context.ControllerAction.MethodInfo.CustomAttributes.FirstOrDefault(c => c.AttributeType == typeof(HalEmbeddedResourceAttribute));
if (attribute != null)
{
embeddedResourceName = (string)attribute.ConstructorArguments.FirstOrDefault(x => x.ArgumentType == typeof(string)).Value;
}
var resourceBuilder = linkItemBuilder.AddEmbedded(embeddedResourceName)
.Resource(new ResourceBuilder().WithState(context.State));
return(resourceBuilder);
}
/// <summary>
/// Registers the hal builder factory for the default HTTP GET method, which returns a collection
/// of the aggregates with pagination enabled and a search criteria applied.
/// </summary>
protected virtual void RegisterHalBuilderFactoryForGetAll()
{
this.RegisterHalBuilderFactory("*.Get(int, int)", context =>
{
var state = (IPagedResult)context.State;
var pageSize = state.PageSize;
var pageNumber = state.PageNumber;
var totalRecords = state.TotalRecords;
var totalPages = state.TotalPages;
var selfLinkItem = context.HttpContext.Request.GetEncodedUrl();
string prevLinkItem = null;
if (pageNumber > 1 && pageNumber <= totalPages)
{
prevLinkItem = GenerateLink(context.HttpContext.Request, new Dictionary <string, StringValues> {
{ "page", (pageNumber - 1).ToString() }
});
}
string nextLinkItem = null;
if (pageNumber < totalPages)
{
nextLinkItem = GenerateLink(context.HttpContext.Request, new Dictionary <string, StringValues> {
{ "page", (pageNumber + 1).ToString() }
});
}
var linkItemBuilder = new ResourceBuilder()
.WithState(new { pageNumber, pageSize, totalRecords, totalPages })
.AddSelfLink().WithLinkItem(selfLinkItem);
if (!string.IsNullOrEmpty(prevLinkItem))
{
linkItemBuilder = linkItemBuilder.AddLink("prev").WithLinkItem(prevLinkItem);
}
if (!string.IsNullOrEmpty(nextLinkItem))
{
linkItemBuilder = linkItemBuilder.AddLink("next").WithLinkItem(nextLinkItem);
}
var resourceBuilder = linkItemBuilder.AddEmbedded(context.ControllerAction.ControllerName.ToLower())
.Resource(new ResourceBuilder().WithState(context.State));
return(resourceBuilder);
}
);
}
/// <summary>
/// The helper method which returns the HAL build factory that can build the HAL with the <see cref="IPagedResult"/>
/// object.
/// </summary>
/// <param name="context">The <see cref="HalBuildContext"/> object that carries the information for creating
/// the HAL builder.</param>
/// <returns>The <see cref="IBuilder"/> object which can build a HAL data structure.</returns>
protected IBuilder GetPagedResultHalBuildFactory(HalBuildContext context)
{
if (!(context.State is IPagedResult))
{
throw new HalBuildConfigurationException("The state returned from the controller action cannot be converted into IPagedResult instance.");
}
var state = (IPagedResult)context.State;
var pageSize = state.PageSize;
var pageNumber = state.PageNumber <= 0 ? 1 : state.PageNumber;
var totalRecords = state.TotalRecords;
var totalPages = state.TotalPages;
var selfLinkItem = context.HttpContext.Request.GetEncodedUrl();
var pageNumberParameterName = InferPageNumberParameterName(context.ControllerAction);
var linkItemBuilder = new ResourceBuilder()
.WithState(new { pageNumber, pageSize, totalRecords, totalPages })
.AddSelfLink().WithLinkItem(selfLinkItem);
if (!string.IsNullOrEmpty(pageNumberParameterName))
{
var firstLinkItem = GenerateLink(context.HttpContext.Request, new Dictionary <string, StringValues> {
{ pageNumberParameterName, 1.ToString() }
});
linkItemBuilder = linkItemBuilder.AddLink("first").WithLinkItem(firstLinkItem);
var lastLinkItem = GenerateLink(context.HttpContext.Request, new Dictionary <string, StringValues> {
{ pageNumberParameterName, totalPages.ToString() }
});
linkItemBuilder = linkItemBuilder.AddLink("last").WithLinkItem(lastLinkItem);
string prevLinkItem = null;
if (pageNumber > 1 && pageNumber <= totalPages)
{
prevLinkItem = GenerateLink(context.HttpContext.Request, new Dictionary <string, StringValues> {
{ pageNumberParameterName, (pageNumber - 1).ToString() }
});
linkItemBuilder = linkItemBuilder.AddLink("prev").WithLinkItem(prevLinkItem);
}
string nextLinkItem = null;
if (pageNumber >= 1 && pageNumber < totalPages)
{
nextLinkItem = GenerateLink(context.HttpContext.Request, new Dictionary <string, StringValues> {
{ pageNumberParameterName, (pageNumber + 1).ToString() }
});
linkItemBuilder = linkItemBuilder.AddLink("next").WithLinkItem(nextLinkItem);
}
}
var embeddedResourceName = context.ControllerAction.ControllerName.ToLower();
var attribute = context.ControllerAction.MethodInfo.CustomAttributes.FirstOrDefault(c => c.AttributeType == typeof(HalEmbeddedResourceAttribute));
if (attribute != null)
{
embeddedResourceName = (string)attribute.ConstructorArguments.FirstOrDefault(x => x.ArgumentType == typeof(string)).Value;
}
var resourceBuilder = linkItemBuilder.AddEmbedded(embeddedResourceName)
.Resource(new ResourceBuilder().WithState(context.State));
return(resourceBuilder);
}
