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diff --git a/include/class_collector.h b/include/class_collector.h
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+/*
+ * This program source code file is part of KiCad, a free EDA CAD application.
+ *
+ * Copyright (C) 2007-2008 SoftPLC Corporation, Dick Hollenbeck <dick@softplc.com>
+ * Copyright (C) 2004-2007 KiCad Developers, see change_log.txt for contributors.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License
+ * as published by the Free Software Foundation; either version 2
+ * of the License, or (at your option) any later version.
+ *
+ * This program 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 General Public License for more details.
+ *
+ * You should have received a copy of the GNU General Public License
+ * along with this program; if not, you may find one here:
+ * http://www.gnu.org/licenses/old-licenses/gpl-2.0.html
+ * or you may search the http://www.gnu.org website for the version 2 license,
+ * or you may write to the Free Software Foundation, Inc.,
+ * 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA
+ */
+
+/**
+ * @file class_collector.h
+ * @brief COLLECTOR class definition.
+ */
+
+#ifndef COLLECTOR_H
+#define COLLECTOR_H
+
+#include <vector>
+
+#include <fctsys.h>
+#include <base_struct.h>    // SEARCH_RESULT
+#include <common.h>         // GetNewTimeStamp()
+
+
+class EDA_ITEM;
+
+
+/**
+ * Class COLLECTOR
+ * is an abstract class that will find and hold all the objects according to
+ * an inspection done by the Inspect() function which must be implemented by
+ * any derived class.  When Inspect() finds an object that it wants to collect,
+ * i.e. one that it "likes", then it only has to do an Append( testItem )
+ * on it to add it to its collection, but in all cases for the scan to continue,
+ * Inspect() must return SEARCH_CONTINUE.
+ *
+ * Later, after collection, the user can iterate through all the objects
+ * in the remembered collection using GetCount() and the [int] operator.
+ */
+class COLLECTOR : public INSPECTOR
+{
+protected:
+    /// Which object types to scan
+    const KICAD_T* m_ScanTypes;
+
+    /// A place to hold collected objects without taking ownership of their memory.
+    std::vector<EDA_ITEM*> m_List;
+
+    /// A point to test against, and that was used to make the collection.
+    wxPoint m_RefPos;
+
+    /// A bounding box to test against, and that was used to make the collection.
+    EDA_RECT m_RefBox;
+
+    /// The time at which the collection was made.
+    time_t m_TimeAtCollection;
+
+public:
+    COLLECTOR()
+    {
+        m_ScanTypes = 0;
+        m_TimeAtCollection = 0;
+    }
+
+    virtual ~COLLECTOR() {}
+
+    /**
+     * Function IsValidIndex
+     * tests if \a aIndex is with the limits of the list of collected items.
+     *
+     * @param aIndex The index to test.
+     * @return True if \a aIndex is with the limits of the list of collected items,
+     *         otherwise false.
+     */
+    bool IsValidIndex( int aIndex )
+    {
+        return ( (unsigned) aIndex < m_List.size() );
+    }
+
+    /**
+     * Function GetCount
+     * returns the number of objects in the list
+     */
+    int GetCount() const
+    {
+        return (int) m_List.size();
+    }
+
+    /**
+     * Function Empty
+     * sets the list to empty
+     */
+    void Empty()
+    {
+        m_List.clear();
+    }
+
+    /**
+     * Function Append
+     * adds an item to the end of the list.
+     * @param item An EDA_ITEM* to add.
+     */
+    void Append( EDA_ITEM* item )
+    {
+        m_List.push_back( item );
+    }
+
+    /**
+     * Function Remove
+     * removes the item at \a aIndex (first position is 0);
+     * @param aIndex The index into the list.
+     */
+    void Remove( int aIndex )
+    {
+        m_List.erase( m_List.begin() + aIndex );
+    }
+
+    /**
+     * Function Remove
+     * removes the item aItem (if exists in the collector).
+     * @param aItem the item to be removed.
+     */
+    void Remove( const EDA_ITEM* aItem )
+    {
+        for( size_t i = 0;  i < m_List.size();  i++ )
+        {
+            if( m_List[i] == aItem )
+            {
+                m_List.erase( m_List.begin() + i);
+                return;
+            }
+        }
+    }
+
+    /**
+     * Function operator[int]
+     * is used for read only access and returns the object at \a aIndex.
+     * @param aIndex The index into the list.
+     * @return EDA_ITEM* - or something derived from it, or NULL.
+     */
+    EDA_ITEM* operator[]( int aIndex ) const
+    {
+        if( (unsigned)aIndex < (unsigned)GetCount() )  // (unsigned) excludes aIndex<0 also
+            return m_List[ aIndex ];
+
+        return NULL;
+    }
+
+    /**
+     * Function BasePtr
+     * returns the address of the first element in the array.  Only call this
+     * if there is at least one element in the vector m_List, otherwise a
+     * C++ exception should get thrown.
+     */
+    EDA_ITEM* const* BasePtr() const
+    {
+        return &m_List[0];
+    }
+
+    /**
+     * Function HasItem
+     * tests if \a aItem has already been collected.
+     *
+     * @param aItem The EDA_ITEM* to be tested.
+     * @return True if \a aItem is already collected.
+     */
+    bool HasItem( const EDA_ITEM* aItem ) const
+    {
+        for( size_t i = 0;  i < m_List.size();  i++ )
+        {
+            if( m_List[i] == aItem )
+                return true;
+        }
+
+        return false;
+    }
+
+    /**
+     * Function SetScanTypes
+     * records the list of KICAD_T types to consider for collection by
+     * the Inspect() function.
+     * @param scanTypes An array of KICAD_T, terminated by EOT.  No copy is
+     *                  is made of this array (so cannot come from caller's stack).
+     */
+    void SetScanTypes( const KICAD_T* scanTypes )
+    {
+        m_ScanTypes = scanTypes;
+    }
+
+    void SetTimeNow()
+    {
+        m_TimeAtCollection = GetNewTimeStamp();
+    }
+
+    time_t GetTime()
+    {
+        return m_TimeAtCollection;
+    }
+
+    void SetRefPos( const wxPoint& aRefPos )  {  m_RefPos = aRefPos; }
+    const wxPoint& GetRefPos() const  {  return m_RefPos; }
+
+    void SetBoundingBox( const EDA_RECT& aRefBox ) { m_RefBox = aRefBox;  }
+    const EDA_RECT& GetBoundingBox() const {  return m_RefBox; }
+
+    /**
+     * Function IsSimilarPointAndTime
+     * returns true if the given reference point is "similar" (defined here)
+     * to the internal reference point and the current time is within a few
+     * seconds of the internal m_TimeAtCollection.
+     *
+     * @param aRefPos A wxPoint to compare to.
+     * @return bool - true if the point and time are similar, else false.
+     */
+    bool IsSimilarPointAndTime( const wxPoint& aRefPos )
+    {
+        const int distMax = 2;      // adjust these here
+        const time_t timeMax = 3;   // seconds
+
+        int dx = abs( aRefPos.x - m_RefPos.x );
+        int dy = abs( aRefPos.y - m_RefPos.y );
+
+        if( dx <= distMax && dy <= distMax &&
+            (int)GetNewTimeStamp() - m_TimeAtCollection <= timeMax )
+            return true;
+        else
+            return false;
+    }
+    /**
+     * Function CountType
+     * counts the number of items matching aType
+     * @param aType type we are interested in
+     * @return number of occurences
+     */
+    int CountType( KICAD_T aType )
+    {
+        int cnt = 0;
+        for( size_t i = 0;  i < m_List.size();  i++ )
+        {
+            if( m_List[i]->Type() == aType )
+                cnt++;
+        }
+        return cnt;
+    }
+
+    /**
+     * Function Collect
+     * scans an EDA_ITEM using this class's Inspector method, which does
+     * the collection.
+     * @param container An EDA_ITEM to scan, including those items it contains.
+     * @param aRefPos A wxPoint to use in hit-testing.
+     *
+     * example implementation, in derived class:
+     *
+    void Collect( EDA_ITEM* container, const wxPoint& aRefPos )
+    {
+        example implementation:
+
+        SetRefPos( aRefPos );    // remember where the snapshot was taken from
+
+        Empty();        // empty the collection
+
+        // visit the board with the INSPECTOR (me).
+        container->Visit(   this,       // INSPECTOR* inspector
+                            NULL,       // const void* testData,
+                            m_ScanTypes);
+        SetTimeNow();                   // when it was taken
+    }
+    */
+};
+
+#endif  // COLLECTOR_H