using FastJSON;
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using System;
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using System.Collections;
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using System.Collections.Generic;
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using System.Reflection;
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using System.Threading;
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using System.Xml.Serialization;
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namespace Top.Api.Parser
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{
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/// <summary>
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/// TOP JSON响应通用解释器。
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/// </summary>
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public class TopJsonParser<T> : ITopParser<T> where T : TopResponse
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{
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private static readonly ReaderWriterLock rwLock = new ReaderWriterLock();
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private static readonly Dictionary<string, Dictionary<string, TopAttribute>> attrs = new Dictionary<string, Dictionary<string, TopAttribute>>();
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#region ITopParser Members
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public virtual T Parse(string body)
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{
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return Parse(body, typeof(T));
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}
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public T Parse(string body, Type type)
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{
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T rsp = null;
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IDictionary json = JSON.Parse(body) as IDictionary;
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if (json != null)
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{
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IDictionary data = null;
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// 忽略根节点的名称
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foreach (object key in json.Keys)
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{
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data = json[key] as IDictionary;
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break;
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}
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if (data != null)
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{
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ITopReader reader = new TopJsonReader(data);
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rsp = (T)FromJson(reader, type);
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}
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}
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if (rsp == null)
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{
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rsp = Activator.CreateInstance(type) as T;
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}
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if (rsp != null)
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{
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rsp.Body = body;
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}
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return rsp;
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}
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#endregion
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private Dictionary<string, TopAttribute> GetTopAttributes(Type type)
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{
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Dictionary<string, TopAttribute> tas = null;
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bool inc = false;
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rwLock.AcquireReaderLock(50);
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try
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{
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if (rwLock.IsReaderLockHeld)
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{
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inc = attrs.TryGetValue(type.FullName, out tas);
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}
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}
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finally
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{
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if (rwLock.IsReaderLockHeld)
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{
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rwLock.ReleaseReaderLock();
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}
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}
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if (inc && tas != null) // 从缓存中获取类属性元数据
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{
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return tas;
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}
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else // 创建新的类属性元数据缓存
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{
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tas = new Dictionary<string, TopAttribute>();
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}
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PropertyInfo[] pis = type.GetProperties();
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foreach (PropertyInfo pi in pis)
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{
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TopAttribute ta = new TopAttribute();
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ta.Method = pi.GetSetMethod();
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// 获取对象属性名称
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XmlElementAttribute[] xeas = pi.GetCustomAttributes(typeof(XmlElementAttribute), true) as XmlElementAttribute[];
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if (xeas != null && xeas.Length > 0)
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{
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ta.ItemName = xeas[0].ElementName;
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}
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// 获取列表属性名称
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if (ta.ItemName == null)
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{
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XmlArrayItemAttribute[] xaias = pi.GetCustomAttributes(typeof(XmlArrayItemAttribute), true) as XmlArrayItemAttribute[];
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if (xaias != null && xaias.Length > 0)
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{
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ta.ItemName = xaias[0].ElementName;
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}
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XmlArrayAttribute[] xaas = pi.GetCustomAttributes(typeof(XmlArrayAttribute), true) as XmlArrayAttribute[];
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if (xaas != null && xaas.Length > 0)
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{
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ta.ListName = xaas[0].ElementName;
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}
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if (ta.ListName == null)
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{
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continue;
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}
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}
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// 获取属性类型
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if (pi.PropertyType.IsGenericType)
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{
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Type[] types = pi.PropertyType.GetGenericArguments();
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ta.ListType = types[0];
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}
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else
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{
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ta.ItemType = pi.PropertyType;
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}
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tas.Add(pi.Name, ta);
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}
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rwLock.AcquireWriterLock(50);
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try
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{
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if (rwLock.IsWriterLockHeld)
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{
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attrs[type.FullName] = tas;
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}
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}
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finally
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{
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if (rwLock.IsWriterLockHeld)
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{
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rwLock.ReleaseWriterLock();
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}
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}
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return tas;
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}
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public object FromJson(ITopReader reader, Type type)
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{
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object rsp = null;
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Dictionary<string, TopAttribute> pas = GetTopAttributes(type);
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Dictionary<string, TopAttribute>.Enumerator em = pas.GetEnumerator();
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while (em.MoveNext())
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{
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KeyValuePair<string, TopAttribute> kvp = em.Current;
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TopAttribute ta = kvp.Value;
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string itemName = ta.ItemName;
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string listName = ta.ListName;
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if (!reader.HasReturnField(itemName) && (string.IsNullOrEmpty(listName) || !reader.HasReturnField(listName)))
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{
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continue;
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}
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object value = null;
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if (ta.ListType != null)
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{
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value = reader.GetListObjects(listName, itemName, ta.ListType, FromJson);
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}
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else
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{
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if (typeof(string) == ta.ItemType)
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{
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object tmp = reader.GetPrimitiveObject(itemName);
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if (typeof(string) == tmp.GetType())
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{
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value = tmp;
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}
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else
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{
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if (tmp != null)
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{
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value = JSON.ToJSON(tmp);
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}
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}
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}
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else if (typeof(long) == ta.ItemType)
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{
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object tmp = reader.GetPrimitiveObject(itemName);
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if (typeof(long) == tmp.GetType())
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{
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value = tmp;
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}
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else
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{
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if (tmp != null)
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{
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value = long.Parse(tmp.ToString());
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}
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}
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}
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else if (typeof(bool) == ta.ItemType)
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{
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object tmp = reader.GetPrimitiveObject(itemName);
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if (typeof(bool) == tmp.GetType())
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{
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value = tmp;
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}
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else
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{
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if (tmp != null)
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{
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value = bool.Parse(tmp.ToString());
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}
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}
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}
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else
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{
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value = reader.GetReferenceObject(itemName, ta.ItemType, FromJson);
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}
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}
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if (value != null)
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{
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if (rsp == null)
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{
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rsp = Activator.CreateInstance(type);
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}
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ta.Method.Invoke(rsp, new object[] { value });
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}
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}
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return rsp;
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}
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}
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}
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