// Copyright 2010 ESRI
// 
// All rights reserved under the copyright laws of the United States
// and applicable international laws, treaties, and conventions.
// 
// You may freely redistribute and use this sample code, with or
// without modification, provided you include the original copyright
// notice and use restrictions.
// 
// See the use restrictions.
// 


namespace REXMLDataSource_CSharp
{
    // IGISDataSource is the foundation of a Web ADF Common Data Source implementation.  The class
    // implementing this interface will be reponsible for creating resources, which in turn will be
    // responsible for creating functionalities.  IGISDataSource defines a data source connection,
    // including the identity and state of that connection.  So when any of the data source 
    // functionality defined in this assembly is needed - programmatically, by a Web ADF Control, or
    // otherwise - instantiating this class is the first step in accessing the required functionality.
    //
    // Put more succinctly, an IGISDataSource implementation can be thought of as describing how the
    // data can be accessed.
    public class GISDataSource : ESRI.ArcGIS.ADF.Web.DataSources.IGISDataSource
    {
        #region Instance Variables

        private System.Collections.Hashtable m_stateHashTable;
        private string m_name = string.Empty;        
        private string m_dataSourceDefinition = string.Empty;
        private string m_identity = string.Empty;
        private System.Web.UI.Page m_page = null;
        private ESRI.ArcGIS.ADF.Web.DataSources.GISResourceCollection m_gisResourceCollection =
            new ESRI.ArcGIS.ADF.Web.DataSources.GISResourceCollection();
        private bool m_initialized = false;

        #endregion

        #region Constructors

        // Allow instantiation without defining any properties
        public GISDataSource() { }

        // Handle the instantiation case where identity is undefined via inheritance
        public GISDataSource(string name, string dataSourceDefinition) : this(name, string.Empty, 
            dataSourceDefinition) { }

        // Explicitly set instance properties in cases where the class is instantiated with
        // data source name, identity, and definition
        public GISDataSource(string name, string identity, string dataSourceDefinition)
        {
            m_name = name;
            m_identity = identity;
            m_dataSourceDefinition = dataSourceDefinition;
        }

        #endregion

        #region IGISDataSource Members

        #region IGISDataSource Properties

        // Name of the data source
        public string Name
        {
            get { return m_name; }
            set { m_name = value; }
        }

        // Definition of the data source.  In this case, this will be the location of the 
        // REXML file.
        public string DataSourceDefinition
        {
            get { return m_dataSourceDefinition; }
            set
            {
                if (m_dataSourceDefinition != value)
                {
                    m_dataSourceDefinition = value;
                }
            }
        }

        // Identity for connecting to the data source
        public string Identity
        {
            get { return m_identity; }
            set { m_identity = value; }
        }

        // Page containing the web control referencing the data source
        public System.Web.UI.Page Page
        {
            get { return m_page; }
            set { m_page = value; }
        }

        // Resources made available via this data source.  These must implement IGISResource
        // and provide access to the data source's functionality classes
        public ESRI.ArcGIS.ADF.Web.DataSources.GISResourceCollection Resources
        {
            get { return m_gisResourceCollection; }
            set { m_gisResourceCollection = value; }
        }

        // Whether the data source has been initialized
        public bool Initialized
        {
            get { return m_initialized; }
        }

        // Retrieves object state
        public System.Collections.Hashtable State
        {
            get { return m_stateHashTable; }
        }

        #endregion

        #region IGISDataSource Methods

        // Loads the passed-in state of the data source into the object.  State retrieval
        // from external sources would also be performed here, if needed.
        public void LoadState(System.Collections.Hashtable state)
        {
            m_stateHashTable = state;
        }

        // Sets the initalized flag of the data source to true.  Any needed initialization
        // logic (e.g. initializing a connection) would be inserted here.
        public void Initialize()
        {
            m_initialized = true;
        }

        // Saves the state of the data source.  If something in the object's state needed
        // to be persisted elsewhere, it would be done here.
        public System.Collections.Hashtable SaveState()
        {
            return m_stateHashTable;
        }

        // Sets the initalized flag of the data source to false.  Any logic needed to release
        // or reset objects manipulated in Initialize would be inserted here.
        public void Dispose()
        {
            m_initialized = false;
        }

        // Function to find resource objects that use the data source and return their 
        // definition strings
        public string[] GetAvailableResourceDefinitions(System.Type resourceType)
        {
            throw new System.Exception("The method or operation is not implemented.");
        }

        // Function to create a resource based on the passed-in resource definition string and name
        public ESRI.ArcGIS.ADF.Web.DataSources.IGISResource CreateResource(string resourceDefinition, 
            string name)
        {
            throw new System.Exception("The method or operation is not implemented.");
        }

        #endregion

        #endregion
    }
}