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using System;
using System.Collections.Generic;
using System.Text;
namespace System.Data.Linq.SqlClient {
/// <summary>
/// Associate annotations with SqlNodes.
/// </summary>
internal class SqlNodeAnnotations {
Dictionary<SqlNode, List<SqlNodeAnnotation>> annotationMap = new Dictionary<SqlNode, List<SqlNodeAnnotation>>();
Dictionary<Type, string> uniqueTypes = new Dictionary<Type, string>();
/// <summary>
/// Add an annotation to the given node.
/// </summary>
internal void Add(SqlNode node, SqlNodeAnnotation annotation) {
List<SqlNodeAnnotation> list = null;
if (!this.annotationMap.TryGetValue(node, out list)) {
list = new List<SqlNodeAnnotation>();
this.annotationMap[node]=list;
}
uniqueTypes[annotation.GetType()] = String.Empty;
list.Add(annotation);
}
/// <summary>
/// Gets the annotations for the given node. Null if none.
/// </summary>
internal List<SqlNodeAnnotation> Get(SqlNode node) {
List<SqlNodeAnnotation> list = null;
this.annotationMap.TryGetValue(node, out list);
return list;
}
/// <summary>
/// Whether the given node has annotations.
/// </summary>
internal bool NodeIsAnnotated(SqlNode node) {
if (node == null)
return false;
return this.annotationMap.ContainsKey(node);
}
/// <summary>
/// Checks whether there's at least one annotation of the given type.
/// </summary>
internal bool HasAnnotationType(Type type) {
return this.uniqueTypes.ContainsKey(type);
}
}
}
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