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package iaik.pkcs.pkcs11;

import iaik.pkcs.pkcs11.wrapper.Constants;

/**
 * This class is a simeple implementation of InitializeArgs.
 *
 * @author <a href="mailto:Karl.Scheibelhofer@iaik.at"> Karl Scheibelhofer </a>
 * @version 1.0
 * @invariants
 */
public class DefaultInitializeArgs implements InitializeArgs {

	/**
	 * The mutex-handler of this object.
	 */
	protected MutexHandler mutexHandler_;

	/**
	 * Indicates that application threads which are executing calls to the
	 * library may not use native operating system calls to spawn new threads.
	 */
	protected boolean libraryCantCreateOsThreads_;

	/**
	 * Indicates that the libary may use mechanisms of the operating-system
	 * to do thread-locking.
	 */
	protected boolean osLockingOk_;

	/**
	 * The reserved parameter in the initialization arguments.
	 */
	protected Object reserved_;

	/**
	 * Default constructor.
	 *
	 * @preconditions
	 * @postconditions (mutexHandler_ == null)
	 *                 and (libraryCantCreateOsThreads_ == false)
	 *                 and (osLockingOk_ == true)
	 */
	public DefaultInitializeArgs() {
		mutexHandler_ = null;
		libraryCantCreateOsThreads_ = false;
		osLockingOk_ = true;
		reserved_ = null;
	}

	/**
	 * Constructor, taking a mutex-handler, the libraryCantCreateOsThreads flag
	 * and the osLockingOk flag.
	 *
	 * @param mutexHandler The PKCS#11 module should use this mutex-handler.
	 * @param libraryCantCreateOsThreads Indicates that application threads which
	 *                                   are executing calls to the library may
	 *                                   not use native operating system calls to
	 *                                   spawn new threads .
	 * @param osLockingOk Indicates that the libary may use mechanisms of the
	 *                    operating-system to do thread-locking.
	 * @preconditions
	 * @postconditions (mutexHandler_ == mutexHandler)
	 *                 and (libraryCantCreateOsThreads_ == libraryCantCreateOsThreads)
	 *                 and (osLockingOk_ == osLockingOk)
	 */
	public DefaultInitializeArgs(MutexHandler mutexHandler,
	                             boolean libraryCantCreateOsThreads,
	                             boolean osLockingOk)
	{
		mutexHandler_ = mutexHandler;
		libraryCantCreateOsThreads_ = libraryCantCreateOsThreads;
		osLockingOk_ = osLockingOk;
		reserved_ = null;
	}

	/**
	 * This method returns the object that implements the functionality for
	 * handling mutexes. It returns null, if no handler is set. If this method
	 * returns null, the wrapper does not pass any callback functions to the
	 * underlying module; i.e. is passes null-pointer for the functions.
	 *
	 * @return The handler object for mutex functionality, or null, if there is
	 *         no handler for mutexes.
	 * @preconditions
	 * @postconditions (result == mutexHandler_)
	 */
	public MutexHandler getMutexHandler() {
		return mutexHandler_;
	}

	/**
	 * Check, if application threads which are executing calls to the library may
	 * not use native operating system calls to spawn new threads.
	 *
	 * @return True, if application threads which are executing calls to the
	 *         library may not use native operating system calls to spawn new
	 *         threads. False, if they may.
	 * @preconditions
	 * @postconditions (result == libraryCantCreateOsThreads_)
	 */
	public boolean isLibraryCantCreateOsThreads() {
		return libraryCantCreateOsThreads_;
	}

	/**
	 * Check, if the library can use the native operation system threading model
	 * for locking.
	 *
	 * @return True, if the library can use the native operation system threading
	 *         model for locking. Fasle, otherwise.
	 * @preconditions
	 * @postconditions (result == osLockingOk_)
	 */
	public boolean isOsLockingOk() {
		return osLockingOk_;
	}

	/**
	 * Reserved parameter.
	 *
	 * @return Should be null in this version.
	 * @preconditions
	 * @postconditions
	 */
	public Object getReserved() {
		return reserved_;
	}

	/**
	 * This method sets the object that implements the functionality for
	 * handling mutexes. It should be null to set no handler.
	 *
	 * @param mutexHandler The handler object for mutex functionality, or null
	 *                     to use no handler.
	 * @preconditions
	 * @postconditions (mutexHandler_ = mutexHandler)
	 */
	public void setMutexHandler(MutexHandler mutexHandler) {
		mutexHandler_ = mutexHandler;
	}

	/**
	 * Set, if application threads which are executing calls to the library may
	 * not use native operating system calls to spawn new threads.
	 *
	 * @param libraryCantCreateOsThreads True, if application threads which are
	 *                                   executing calls to the library may not
	 *                                   use native operating system calls to
	 *                                   spawn new threads. False, if they may.
	 * @preconditions
	 * @postconditions (libraryCantCreateOsThreads_ == libraryCantCreateOsThreads)
	 */
	public void setLibraryCantCreateOsThreads(boolean libraryCantCreateOsThreads) {
		libraryCantCreateOsThreads_ = libraryCantCreateOsThreads;
	}

	/**
	 * set, if the library can use the native operation system threading model
	 * for locking.
	 *
	 * @param osLockingOk True, if the library can use the native operation system
	 *                    threading model for locking. Fasle, otherwise.
	 * @preconditions
	 * @postconditions (osLockingOk_ == osLockingOk)
	 */
	public void setOsLockingOk(boolean osLockingOk) {
		osLockingOk_ = osLockingOk;
	}

	/**
	 * Set the reserved parameter.
	 *
	 * @param reserved Should be null in this version.
	 * @preconditions
	 * @postconditions
	 */
	public void setReserved(Object reserved) {
		reserved_ = reserved;
	}

	/**
	 * Returns the string representation of this object.
	 *
	 * @return The string representation of object
	 */
	public String toString() {
		StringBuffer buffer = new StringBuffer();

		buffer.append("Mutex Handler: ");
		buffer.append((mutexHandler_ != null) ? "present" : "not present");
		buffer.append(Constants.NEWLINE);

		buffer.append("Library can't create OS-Threads: ");
		buffer.append(libraryCantCreateOsThreads_);
		buffer.append(Constants.NEWLINE);

		buffer.append("OS-Locking OK: ");
		buffer.append(osLockingOk_);
		buffer.append(Constants.NEWLINE);

		buffer.append("The reserved parameter is: ");
		buffer.append((reserved_ != null) ? reserved_.toString() : "null");

		return buffer.toString();
	}

}