package yww.snmpif;

import java.io.File;
import java.io.IOException;
import java.util.Enumeration;
import java.util.Hashtable;

import net.percederberg.mibble.Mib;
import net.percederberg.mibble.MibLoader;
import net.percederberg.mibble.MibLoaderException;
import net.percederberg.mibble.MibSymbol;
import net.percederberg.mibble.MibValue;
import net.percederberg.mibble.MibValueSymbol;
import net.percederberg.mibble.value.ObjectIdentifierValue;
import yww.util.Log;

/**
 * 用戶加載指定的MIB文件,從中根據name獲得oid
 * <br>1.文件加載
 * <br>2.name和oid的轉換
 * @author Administrator
 *
 */
public class MibParserAPI {

	static MibLoader loader = new MibLoader();;
	static Hashtable mibs = new Hashtable();
	
	
	/**
	 * 單個載入MIB庫
	 * @param path - the path of mib file
	 */ 
	public static void load(String path)
	{
		try{
			File file = new File(path);
			Log.info("loading "+file);
			loader.addDir(file.getParentFile());
			
			Mib m = loader.load(file);
			Log.info("loaded "+m);
			if(m!=null) mibs.put(m.getName(),m);
			else 
				Log.error("can not load "+path);
		}catch(IOException e)
		{
			Log.error("io error",e);
		}catch(MibLoaderException e){
			Log.error("load error",e);
		}
	}
	
	/**
	 * 載入多個MIB庫
	 * @param path - the String array to hold mib file paths
	 */
	public static void load(String[] path)
	{
		for(int i=0;i<path.length;i++)
		{
			load(path[i]);
		}
	}
	
	/**
	 * 根據mib中定義的oid名稱獲取OID值
	 * @param name - the name defined in mib
	 * @return the oid correspond to name
	 */
	public static String getOIDByName(String name)
	{
		Enumeration enu = mibs.keys();
		while(enu.hasMoreElements())
		{
			String mibName = (String)enu.nextElement();
			String oid = getOIDByName(mibName,name);
			if(oid!=null) return oid;
		}
		return null;
	}
	
	/**
	 * 在指定mib庫文件時獲取與oid名稱對應的OID值
	 * @param mibName - mib file name,exclude path,just a file name
	 * @param name - the name defined in mib
	 * @return the oid correspond to name in specified mib file
	 */
	public static String getOIDByName(String mibName,String name)
	{
		Mib mib = (Mib)mibs.get(mibName);
		MibSymbol symbol = mib.getSymbol(name);
		if(symbol instanceof MibValueSymbol)
		{
			MibValue value = ((MibValueSymbol)symbol).getValue();
			if(value instanceof ObjectIdentifierValue){
				ObjectIdentifierValue oid = (ObjectIdentifierValue)value;
				return oid.toString();
			}else return null;
		}else return null;
	}
	
	/**
	 * 根據OID值獲得相應的oid名稱
	 * @param OID - oid value,
	 * @return oid name correspond to oid value
	 */
	public static String getNameByOID(String OID)
	{
		Enumeration enu = mibs.keys();
		while(enu.hasMoreElements())
		{
			String mibName = (String)enu.nextElement();
			String name = getNameByOID(mibName,OID);
			if(name!=null) return name;
		}
		return null;
	}
	
	/**
	 * 在指定的MIB文件中獲取OID對應的名稱
	 * @param mibName - mib file name,exclude path,just a file name
	 * @param OID - oid vlaue
	 * @return the oid name correspond to oid value in specified mib file
	 */
	public static String getNameByOID(String mibName,String OID)
	{
		Mib mib = (Mib)mibs.get(mibName);
		MibSymbol symbol = mib.getSymbolByOid(OID);
		if(symbol!=null)
		{
			String name  = symbol.getName();
			return name;
		}else
			return null;
	}
	
	public static void main(String[] args)
	{
		MibParserAPI.load("D:\\eclipse-SDK-3.1-win32\\eclipse\\workspace\\mibble\\mibs\\ietf\\RFC1213-MIB");
	}
}