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/*
   Copyright The Narayana Authors
   SPDX-License-Identifier: Apache-2.0
 */



package com.arjuna.ats.jta.xa;

import java.io.ByteArrayInputStream;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.io.ObjectInputStream;
import java.io.ObjectOutputStream;
import java.io.Serializable;

import javax.transaction.xa.Xid;

import com.arjuna.ats.arjuna.AtomicAction;
import com.arjuna.ats.arjuna.common.Uid;
import com.arjuna.ats.arjuna.state.InputObjectState;
import com.arjuna.ats.arjuna.state.OutputObjectState;
import com.arjuna.ats.internal.jta.xa.XID;
import com.arjuna.ats.jta.logging.jtaLogger;

/**
 * Implementation of javax.transaction.xa.Xid.
 * 
 * @author Mark Little ([email protected])
 * @version $Id: XidImple.java 2342 2006-03-30 13:06:17Z $
 * @since JTS 1.2.4.
 */

public class XidImple implements javax.transaction.xa.Xid, Serializable {
	private static final long serialVersionUID = -8922505475867377266L;

	public XidImple() {
		_theXid = null;
		hashCode = getHash(_theXid);
	}

	public XidImple(Xid xid) {
		_theXid = null;

		copy(xid);
		
		hashCode = getHash(_theXid) ;
	}

	public XidImple(AtomicAction c) {
		this(c.get_uid(), false, null);
	}

	public XidImple(Xid xid, boolean branch, Integer eisName) {
		this(xid);
		if (branch) {
			XATxConverter.setBranchUID(_theXid, new Uid());
		}
		XATxConverter.setEisName(_theXid, eisName);
	}

	public XidImple(Uid id) {
		this(id, false, null);
	}

	public XidImple(Uid id, boolean branch, Integer eisName) {
		try {
			_theXid = XATxConverter.getXid(id, branch, eisName);
		} catch (Exception e) {
			_theXid = null;

			jtaLogger.i18NLogger.warn_cant_create_xid_of_branch(id, branch, eisName, e);

			// abort or throw exception?
		}
		hashCode = getHash(_theXid);
	}

	public XidImple(XID x) {
		_theXid = x;
		hashCode = getHash(_theXid);
	}

	public final boolean isSameTransaction(Xid xid) {
		if (xid == null)
			return false;

		if (xid instanceof XidImple) {
			return _theXid.isSameTransaction(((XidImple) xid)._theXid);
		}

		if (getFormatId() == xid.getFormatId()) {
			byte[] gtx = xid.getGlobalTransactionId();
			final int gtxlength = (gtx == null ? 0 : gtx.length);

			if (_theXid.gtrid_length == gtxlength) {
				if (equals(xid))
					return true;
				else {
					for (int i = 0; i < _theXid.gtrid_length; i++) {
						if (_theXid.data[i] != gtx[i])
							return false;
					}

					return true;
				}
			}
		}

		return false;
	}

	public int getFormatId() {
		if (_theXid != null) {
			return _theXid.formatID;
		} else
			return -1;
	}

	/**
	 * These operations critically rely on the fact that we unpack the array in
	 * the order we packed it!
	 */

	public byte[] getGlobalTransactionId() {
		if (_theXid != null) {
			byte b[] = new byte[_theXid.gtrid_length];

			System.arraycopy(_theXid.data, 0, b, 0, b.length);

			return b;
		} else
			return null;
	}

	public byte[] getBranchQualifier() {
		if (_theXid != null) {
			byte b[] = new byte[_theXid.bqual_length];

			System.arraycopy(_theXid.data, _theXid.gtrid_length, b, 0, b.length);

			return b;
		} else
			return null;
	}

	public final Uid getTransactionUid() {
		return XATxConverter.getUid(_theXid);
	}

	public final XID getXID() {
		return _theXid;
	}

	public final void copy(Xid xid) {
		_theXid = new XID();

		if (xid != null) {
			if (xid instanceof XidImple)
				_theXid.copy(((XidImple) xid)._theXid);
			else {
				_theXid.formatID = xid.getFormatId();

				byte[] gtx = xid.getGlobalTransactionId();
				byte[] bql = xid.getBranchQualifier();
				final int gtxlength = (gtx == null ? 0 : gtx.length);
				final int bqlength = (bql == null ? 0 : bql.length);

				_theXid.gtrid_length = gtxlength;
				_theXid.bqual_length = bqlength;

				if (gtxlength > 0) {
					System.arraycopy(gtx, 0, _theXid.data, 0, gtxlength);  
				}
				if (bqlength > 0) {
					System.arraycopy(bql, 0, _theXid.data, gtxlength, bqlength);
				}
			}
		}
	}

	public boolean equals(Xid xid) {
		if (xid == null)
			return false;

		if (xid == this)
			return true;
		else {
			if (xid instanceof XidImple)
				return ((XidImple) xid)._theXid.equals(_theXid);
			else {
				if (xid.getFormatId() == _theXid.formatID) {
					byte[] gtx = xid.getGlobalTransactionId();
					byte[] bql = xid.getBranchQualifier();
					final int gtxlength = (gtx == null ? 0 : gtx.length);
					final int bqlength = (bql == null ? 0 : bql.length);

					if ((_theXid.gtrid_length == gtxlength)
							&& (_theXid.bqual_length == bqlength)) {
						int i;

						for (i = 0; i < _theXid.gtrid_length; i++) {
							if (_theXid.data[i] != gtx[i])
								return false;
						}

						for (i = _theXid.gtrid_length; i < _theXid.gtrid_length
								+ _theXid.bqual_length; i++) {
							if (_theXid.data[i] != bql[i])
								return false;
						}

						return true;
					}
				}
			}
		}

		return false;
	}

	public final boolean packInto(OutputObjectState os) {
		boolean result = false;

		try {
			os.packInt(_theXid.formatID);
			os.packInt(_theXid.gtrid_length);
			os.packInt(_theXid.bqual_length);
			os.packBytes(_theXid.data);

			result = true;
		} catch (Exception e) {
			jtaLogger.i18NLogger.warn_cant_pack_into_output_object_state(os, e);

			result = false;
		}

		return result;
	}

	public final boolean unpackFrom(InputObjectState os) {
		boolean result = false;

		try {
			if (_theXid == null)
				_theXid = new XID();

			_theXid.formatID = os.unpackInt();
			_theXid.gtrid_length = os.unpackInt();
			_theXid.bqual_length = os.unpackInt();
			_theXid.data = os.unpackBytes();

			hashCode = getHash(_theXid);

			result = true;
		} catch (Exception e) {
			jtaLogger.logger.debug("Can't unpack from input object state " + os, e);
			result = false;
		}

		return result;
	}

	public static final void pack(OutputObjectState os, Xid xid)
			throws IOException {
		if (xid instanceof XidImple) {
			XidImple x = (XidImple) xid;

			os.packBoolean(true);

			if (!x.packInto(os))
				throw new IOException(jtaLogger.i18NLogger.get_xid_packerror(xid));
		} else {
			os.packBoolean(false);

			ByteArrayOutputStream s = new ByteArrayOutputStream();
			ObjectOutputStream o = new ObjectOutputStream(s);

			o.writeObject(xid);
			o.close();

			os.packBytes(s.toByteArray());
		}
	}

	public static final Xid unpack(InputObjectState os) throws IOException {
		if (os.unpackBoolean()) {
			XidImple x = new XidImple();

			x.unpackFrom(os);

			return x;
		} else {
			try {
				byte[] b = os.unpackBytes();

				ByteArrayInputStream s = new ByteArrayInputStream(b);
				ObjectInputStream o = new ObjectInputStream(s);

				Xid x = (Xid) o.readObject();

				return x;
			} catch (Exception e) {
				jtaLogger.logger.debug("Can't unpack input object state " + os, e);
				IOException ioException = new IOException(e.toString());
				ioException.initCause(e);
				throw ioException;
			}
		}
	}

	public String toString() {
		if (_theXid != null)
			return _theXid.toString();
		else
			return jtaLogger.i18NLogger.get_xa_xidunset();
	}

	/**
	 * Is the specified object equal to this one?
	 * 
	 * @param obj
	 *            The object to test.
	 * @return true if they are equal, false otherwise.
	 */
	public boolean equals(final Object obj) {
		if (obj instanceof Xid) {
			return equals((Xid) obj);
		}
		return false;
	}

	/**
	 * Return the hash code for this Xid.
	 * 
	 * @return the hash code.
	 */
	public int hashCode() {
		return hashCode;
	}

	/**
	 * Generate the hash code for the xid.
	 * 
	 * @param xid
	 *            The xid.
	 * @return The hash code.
	 */
	protected int getHash(final XID xid) {
		if (xid == null) {
			return 0;
		}
		final int hash = generateHash(xid.formatID, xid.data, 0,
				xid.gtrid_length);
		return generateHash(hash, xid.data, xid.gtrid_length, xid.bqual_length);
	}

	/**
	 * Generate a hash code for the specified bytes.
	 * 
	 * @param hash
	 *            The initial hash.
	 * @param bytes
	 *            The bytes to include in the hash.
	 * @return The new hash code.
	 */
	protected static int generateHash(int hash, final byte[] bytes,
			final int start, final int length) {
		for (int count = start; count < length; count++) {
			hash = 31 * hash + bytes[count];
		}
		return hash;
	}

	protected XID _theXid;
	private int hashCode;
}