/// <summary>
/// 构造函数
/// </summary>
public MemoryIndex(string strFilePath, Key key)
: base(strFilePath, key)
{
BTree = new List<BTNode>();
fs.Seek(RootNodeStart, SeekOrigin.Begin);
//加载根节点
if (Deep == 1)
{
//树只有一层
for (int i = 0; i < Setp; i++)
{
BTNode Node = ReadFoliageNode();
if (Node == null || Node.Value == -1)
{
break;
}
//id
Node.ID = i;
//节点深度
Node.Depth = Deep;
BTree.Add(Node);
}
}
else
{
//2曾或者三层
for (int i = 0; i < Setp; i++)
{
//每次设置文件指针到 根节点起始位置+NodeLength*i
fs.Seek(RootNodeStart + (NodeLength* i), SeekOrigin.Begin);
BTNode Node = ReadTreeNode();
if (Node == null || Node.Value == -1)
{
break;
}
//id
Node.ID = i;
//节点深度
Node.Depth = Deep;
//位移
Node.Value = i * 1000;
//加载子节点
Node.ChildrenNodes = GetChildNodes(Node);
BTree.Add(Node);
}
}
}
/// <summary>
/// 构造函数
/// </summary>
public FileIndex(string strFilePath, Key key)
: base(strFilePath, key)
{
}
/// <summary>
/// 得到配置文件下的所有索引入口
/// </summary>
/// <returns></returns>
public List<Key> GetSearchEnterKey()
{
List<Key> results = new List<Key>();
List<SearchEnter> lstEnter = SearchEnters;
foreach (SearchEnter se in lstEnter)
{
if (se.Index == 0)
{
continue;
}
if (se.SingleFile == true)
{
Key key = new Key()
{
Name = se.Name,
Length = se.Length,
Encoder = getKeyType(se.WordSplit),
};
if (se.WordSplit == WordSplitType.None)
{
if (se.Name == "TX" || se.Name == "KW")
{
key.Encoder = "gb2312";
}
}
//索引的值类型
Value value = new Value();
value.Type = ValType.Com;
if (se.WordLocation == true)
{
value.Length = 8;
}
else
{
value.Length = 4;
}
key.value = value;
key.ToString();
results.Add(key);
if (se.SubKey.Count > 0)
{
//添加子索引
foreach (SubSearchEnter subse in se.SubKey)
{
//索引的键字类型
Key subkey = new Key()
{
Name = subse.Name,
Length = subse.Length,
Encoder = getKeyType(se.WordSplit)
};
//索引的值类型
Value subvalue = new Value();
subvalue.Length = 4;
subvalue.Type = ValType.Com;
subkey.value = subvalue;
results.Add(subkey);
}
}
}
else
{
if (se.WordSplit == WordSplitType.Cn)
{
//中文1-3字词索引
for (int i = 1; i <= 3; i++)
{
//索引的键字类型
Key wordkey = new Key()
{
Name = se.Name + i.ToString(),
Length = i * 2,
Encoder = getKeyType(se.WordSplit)
};
//索引的值类型
Value wordvalue = new Value();
if (se.WordLocation == true)
{
wordvalue.Length = 8;
}
else
{
wordvalue.Length = 4;
}
wordvalue.Type = ValType.Com;
wordkey.value = wordvalue;
results.Add(wordkey);
}
}
else
{
//英文 的数字索引
Key key = new Key()
{
Name = se.Name + "_0",
Length = 16,
Encoder = "utf-8"
};
//索引的值类型
Value value = new Value();
value.Length = 8;
value.Type = ValType.EnglishWord;
key.value = value;
results.Add(key);
//A-Z 索引
for (int i = 1; i <= 26; i++)
{
//索引的键字类型
Key wordkey = new Key()
{
Name = se.Name + "_" + (char)(i + 64),
Length = 16,
Encoder = "utf-8"
};
//索引的值类型
Value wordvalue = new Value();
wordvalue.Length = 8;
wordvalue.Type = ValType.EnglishWord;
wordkey.value = wordvalue;
results.Add(wordkey);
}
}
}
}
return results;
}
/// <summary>
/// 构造函数
/// </summary>
public Index(string strFilePath, Key key)
{
this.FilePath = strFilePath;
this.Key = key;
NodeLength = Key.Length + 4;
FoliageNodeLength = Key.Length + 8;
by4 = new byte[4];
byTreeNode = new byte[NodeLength];
byFoliage = new byte[FoliageNodeLength];
///打开索引文件
_fs = new FileStream(strFilePath, FileMode.Open, FileAccess.Read);
//读叶子节点起始位置
readLength = _fs.Read(by4, 0, 4);
_FoliageNodeStart = BitConverter.ToInt32(by4, 0);
//读叶子节点的结束位置
readLength = _fs.Read(by4, 0, 4);
_FoliageNodeEnd = BitConverter.ToInt32(by4, 0);
//得到树的深度
_fs.Seek(_FoliageNodeEnd, SeekOrigin.Begin);
readLength = _fs.Read(by4, 0, 4);
Deep = BitConverter.ToInt32(by4, 0);
//根据树的深度判断树的根节点的位置
switch (Deep)
{
case 3:
//中间节点起始位置
readLength = _fs.Read(by4, 0, 4);
_MidNodeStart = _FoliageNodeEnd + BitConverter.ToInt32(by4, 0);
//跟节点的其实位置
readLength = _fs.Read(by4, 0, 4);
_RootNodeStart = _FoliageNodeEnd + BitConverter.ToInt32(by4, 0);
break;
case 2:
//中间节点
_fs.Seek(_FoliageNodeEnd + 4, SeekOrigin.Begin);
readLength = _fs.Read(by4, 0, 4);
_RootNodeStart = _FoliageNodeEnd + BitConverter.ToInt32(by4, 0);
_MidNodeStart = _RootNodeStart;
break;
case 1:
_RootNodeStart = _FoliageNodeStart;
break;
default:
throw new Exception("索引树深度数据异常");
}
}