Subject.cxx
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上传日期:2013-07-25
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- /* ====================================================================
- * The Vovida Software License, Version 1.0
- *
- * Copyright (c) 2000 Vovida Networks, Inc. All rights reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The names "VOCAL", "Vovida Open Communication Application Library",
- * and "Vovida Open Communication Application Library (VOCAL)" must
- * not be used to endorse or promote products derived from this
- * software without prior written permission. For written
- * permission, please contact vocal@vovida.org.
- *
- * 4. Products derived from this software may not be called "VOCAL", nor
- * may "VOCAL" appear in their name, without prior written
- * permission of Vovida Networks, Inc.
- *
- * THIS SOFTWARE IS PROVIDED "AS IS" AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE, TITLE AND
- * NON-INFRINGEMENT ARE DISCLAIMED. IN NO EVENT SHALL VOVIDA
- * NETWORKS, INC. OR ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT DAMAGES
- * IN EXCESS OF $1,000, NOR FOR ANY INDIRECT, INCIDENTAL, SPECIAL,
- * EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
- * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
- * PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY
- * OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
- * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE
- * USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH
- * DAMAGE.
- *
- * ====================================================================
- *
- * This software consists of voluntary contributions made by Vovida
- * Networks, Inc. and many individuals on behalf of Vovida Networks,
- * Inc. For more information on Vovida Networks, Inc., please see
- * <http://www.vovida.org/>.
- *
- */
- static const char* const Subject_cxx_Version =
- "$Id: Subject.cxx,v 1.1 2001/03/30 02:49:20 icahoon Exp $";
- #include "Subject.hxx"
- #include "Observer.hxx"
- using namespace Vocal;
- using Behavioral::Subject;
- using Behavioral::Observer;
- Subject::Subject()
- {
- }
- Subject::~Subject()
- {
- }
- void
- Subject::attach(Observer & src)
- {
- // Push it on the back of the list. The user can enter the same
- // observer more than once if they wish.
- //
- observers_.push_back(&src);
- }
- void
- Subject::detach(Observer & src)
- {
- // Remove the first observer. If not found, do nothing.
- //
- for ( vector<Observer *>::iterator it = observers_.begin();
- it != observers_.end();
- it++
- )
- {
- if ( *(*it) == src )
- {
- observers_.erase(it);
- break;
- }
- }
- }
- void
- Subject::notify()
- {
- for ( vector<Observer *>::iterator it = observers_.begin();
- it != observers_.end();
- it++
- )
- {
- (*it)->update(*this);
- }
- }
- bool
- Subject::operator==(const Subject & src) const
- {
- return ( this == &src );
- }
- ostream &
- Subject::writeTo(ostream & out) const
- {
- out << " observers (size: " << observers_.size() << ") = { ";
-
- bool first = true;
-
- for ( vector<Observer *>::const_iterator it = observers_.begin();
- it != observers_.end();
- it++
- )
- {
- if ( first )
- {
- first = false;
- }
- else
- {
- out << ", ";
- }
- out << *(*it);
- }
- out << " }";
-
- return ( out );
- }