AbstractCollection.h

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/*
 * Copyright (c) 2005 X-Way Rights BV
 *
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2.1 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
 */

#ifndef _ABSTRACT_CLASS_BEE_UTIL_ABSTRACTCOLLECTION_H
#define _ABSTRACT_CLASS_BEE_UTIL_ABSTRACTCOLLECTION_H

#ifdef __cplusplus

#include "beecrypt/c++/lang/Comparable.h"
using beecrypt::lang::Comparable;
#include "beecrypt/c++/lang/StringBuilder.h"
using beecrypt::lang::StringBuilder;
#include "beecrypt/c++/lang/ClassCastException.h"
using beecrypt::lang::ClassCastException;
#include "beecrypt/c++/lang/UnsupportedOperationException.h"
using beecrypt::lang::UnsupportedOperationException;
#include "beecrypt/c++/util/Collection.h"
using beecrypt::util::Collection;

namespace beecrypt {
    namespace util {
        template<class E> class AbstractCollection : public Object, public virtual Collection<E>
        {
        protected:
            AbstractCollection() {}

            static inline bool equals(const E* e1, const E* e2)
            {
                if (e1 && e2)
                    return e1->equals(e2);
                else
                    return e1 == e2;
            }

        public:
            virtual ~AbstractCollection() {}

            virtual bool add(E* e)
            {
                throw UnsupportedOperationException();
            }
            virtual bool addAll(const Collection<E>& c)
            {
                bool result = false;
                jint pos = c.size();
                Iterator<E>* it = iterator();
                assert(it != 0);
                while (--pos >= 0)
                    result |= add(it->next());
                delete it;
                return result;
            }
            virtual void clear()
            {
                jint pos = size();
                Iterator<E>* it = iterator();
                assert(it != 0);
                while (--pos >= 0)
                {
                    it->next();
                    it->remove();
                }
                delete it;
            }
            virtual bool contains(const E* e) const
            {
                bool result = false;
                jint pos = size();
                Iterator<E>* it = iterator();
                assert(it != 0);
                while (--pos >= 0)
                {
                    if (equals(e, it->next()))
                    {
                        result = true;
                        break;
                    }
                }
                delete it;
                return result;
            }
            virtual bool containsAll(const Collection<E>& c) const
            {
                bool result = true;
                jint pos = c.size();
                Iterator<E>* cit = c.iterator();
                assert(cit != 0);
                while (--pos >= 0)
                    if (!contains(cit->next()))
                    {
                        result = false;
                        break;
                    }
                delete cit;
                return result;
            }
            virtual bool equals(const Object* obj) const throw ()
            {
                return Object::equals(obj);
            }
            virtual jint hashCode() const throw ()
            {
                return Object::hashCode();
            }
            virtual bool isEmpty() const throw ()
            {
                return size() == 0;
            }
            virtual Iterator<E>* iterator() = 0;
            virtual Iterator<E>* iterator() const = 0;
            virtual bool remove(const E* e)
            {
                bool result = false;
                jint pos = size();
                Iterator<E>* it = iterator();
                assert(it != 0);
                while (--pos >= 0)
                {
                    if (equals(e, it->next()))
                    {
                        it->remove();
                        result = true;
                        break;
                    }
                }
                delete it;
                return result;
            }
            virtual bool removeAll(const Collection<E>& c)
            {
                bool result = false;
                jint pos = size();
                Iterator<E>* it = iterator();
                assert(it != 0);
                while (--pos >= 0)
                    if (c.contains(it->next()))
                    {
                        it->remove();
                        result = true;
                        break;
                    }
                delete it;
                return result;
            }
            virtual bool retainAll(const Collection<E>& c)
            {
                bool result = false;
                jint pos = c.size();
                Iterator<E>* it = c.iterator();
                assert(it != 0);
                while (--pos >= 0)
                    if (!c.contains(it->next()))
                    {
                        it->remove();
                        result = true;
                        break;
                    }
                delete it;
                return result;
            }
            virtual jint size() const throw () = 0;
            virtual array<E*> toArray() const
            {
                jint pos = size();
                array<E*> result(pos);
                Iterator<E>* it = iterator();
                assert(it != 0);
                for (jint i = 0; --pos >= 0; i++)
                    result[i] = it->next();
                delete it;
                return result;
            }
            virtual String toString() const throw ()
            {
                Iterator<E>* it = iterator();
                assert(it != 0);

                StringBuilder buf("[");

                for (jint pos = size(); pos > 0; pos--)
                {
                    E* e = it->next();
                    if (reinterpret_cast<const void*>(e) == reinterpret_cast<const void*>(this))
                        buf.append("(this Collection)");
                    else
                        buf.append(e);

                    if (pos > 1)
                        buf.append(", ");
                }
                delete it;

                buf.append("]");

                return buf.toString();
            }
        };
    }
}

#endif

#endif