/**************************************************************************
 * EntityPath.java
 *
 * $Revision: 1.14 $
 * $Date: 2006/03/03 13:52:21 $
 *
 * Copyright (C) 2001 CERN - European Organization for Nuclear Research
 * All rights reserved.
 **************************************************************************/

package com.c2kernel.lookup;

import java.nio.ByteBuffer;
import java.util.UUID;

import com.c2kernel.common.ObjectNotFoundException;
import com.c2kernel.common.SystemKey;


/**
* Extends Path to enforce SystemKey structure and support int form
*
* @version $Revision: 1.14 $ $Date: 2006/03/03 13:52:21 $
* @author  $Author: abranson $
**/
public class ItemPath extends Path
{
    
    public ItemPath() {
    	setSysKey(UUID.randomUUID());
    }

    protected ItemPath(UUID uuid) {
       	setSysKey(uuid);
    }

    public ItemPath(SystemKey syskey) {
        setSysKey(syskey);
    }

    /*
    */
    public ItemPath(String[] path) throws InvalidItemPathException
    {
        super(path, Path.CONTEXT);
        getSysKeyFromPath();
    }

    /*
    */
    public ItemPath(String path) throws InvalidItemPathException
    {
        super(path, Path.CONTEXT);
        getSysKeyFromPath();
    }

    private void getSysKeyFromPath() throws InvalidItemPathException {
        if (mPath.length > 0) {
        	try {
        		setSysKey(UUID.fromString(mPath[0]));
        	} catch (IllegalArgumentException ex) {
        		throw new InvalidItemPathException(mPath[0]+" is not a valid UUID");
        	}
        }
    }
    
    // EntityPaths root in /entity
    @Override
	public String getRoot() {
        return "entity";
    }

    @Override
	public ItemPath getItemPath() throws ObjectNotFoundException {
        return this;
    }

    public byte[] getOID() {
        if (mType == Path.CONTEXT) return null;
        ByteBuffer bb = ByteBuffer.wrap(new byte[16]);
        bb.putLong(mSysKey.msb);
        bb.putLong(mSysKey.lsb);
        return bb.array();
    }
    
    protected void setSysKey(UUID uuid) {
		mUUID = uuid;
        mPath = new String[1];
        mPath[0] = mUUID.toString();
		mSysKey = new SystemKey(uuid.getMostSignificantBits(), uuid.getLeastSignificantBits());
		mType = Path.ENTITY;
    }
    
    protected void setSysKey(SystemKey sysKey) {
		mSysKey = sysKey;
		mUUID = new UUID(sysKey.msb, sysKey.lsb);
        mPath = new String[1];
        mPath[0] = mUUID.toString();
		mType = Path.ENTITY;
    }
    
    public static ItemPath fromUUIDString(String uuid) throws InvalidItemPathException {
    	if (uuid == null) throw new InvalidItemPathException("Null uuid");
    	try {
    		return new ItemPath(UUID.fromString(uuid));
    	} catch (IllegalArgumentException ex) {
    		throw new InvalidItemPathException("Illegal uuid: "+uuid);
    	}
    }
}