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  /*
   * Copyright (c) 2003 The Visigoth Software Society. 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 end-user documentation included with the redistribution, if
  *    any, must include the following acknowledgement:
  *       "This product includes software developed by the
  *        Visigoth Software Society (http://www.visigoths.org/)."
  *    Alternately, this acknowledgement may appear in the software itself,
  *    if and wherever such third-party acknowledgements normally appear.
  *
  * 4. Neither the name "FreeMarker", "Visigoth", nor any of the names of the 
  *    project contributors may be used to endorse or promote products derived
  *    from this software without prior written permission. For written
  *    permission, please contact visigoths@visigoths.org.
  *
  * 5. Products derived from this software may not be called "FreeMarker" or "Visigoth"
  *    nor may "FreeMarker" or "Visigoth" appear in their names
  *    without prior written permission of the Visigoth Software Society.
  *
  * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
  * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
  * DISCLAIMED.  IN NO EVENT SHALL THE VISIGOTH SOFTWARE SOCIETY OR
  * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, 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 many
  * individuals on behalf of the Visigoth Software Society. For more
  * information on the Visigoth Software Society, please see
  * http://www.visigoths.org/
  */
 
 package freemarker.debug.impl;
 
 import java.util.List;
 import java.util.Map;
 

Author(s):
Attila Szegedi
Version:
$Id
 
 extends
 {
     private final Map templateDebugInfos = new HashMap();
     private final HashSet suspendedEnvironments = new HashSet();
     private final Map listeners = new HashMap();
     private final ReferenceQueue refQueue = new ReferenceQueue();
      
     {
         try
         {
             new DebuggerServer((Serializable)RemoteObject.toStub(new RmiDebuggerImpl(this))).start();
         }
         catch(RemoteException e)
         {
            e.printStackTrace();
            throw new UndeclaredThrowableException(e);
        }
    }
    
    List getBreakpointsSpi(String templateName)
    {
        synchronized()
        {
            TemplateDebugInfo tdi = findTemplateDebugInfo(templateName);
            return tdi == null ? . : tdi.breakpoints;
        }
    }
    {
        List sumlist = new ArrayList();
        synchronized()
        {
            for (Iterator iter = .values().iterator(); iter.hasNext();)
            {
                sumlist.addAll(((TemplateDebugInfoiter.next()).);
            }
        }
        Collections.sort(sumlist);
        return sumlist;
    }
    boolean suspendEnvironmentSpi(Environment envint line)
    throws
        RemoteException
    {
        RmiDebuggedEnvironmentImpl denv = 
            (RmiDebuggedEnvironmentImpl)
                RmiDebuggedEnvironmentImpl.getCachedWrapperFor(env);
                
        synchronized()
        {
            .add(denv);
        }
        try
        {
            EnvironmentSuspendedEvent breakpointEvent = 
                new EnvironmentSuspendedEvent(thislinedenv);
    
            synchronized()
            {
                for (Iterator iter = .values().iterator(); iter.hasNext();)
                {
                    DebuggerListener listener = (DebuggerListeneriter.next();
                    listener.environmentSuspended(breakpointEvent);
                }
            }
            synchronized(denv)
            {
                try
                {
                    denv.wait();
                }
                catch(InterruptedException e)
                {
                    ;// Intentionally ignored
                }
            }
            return denv.isStopped();
        }
        finally
        {
            synchronized()
            {
                .remove(denv);
            }
        }
    }
    
    void registerTemplateSpi(Template template)
    {
        String templateName = template.getName();
        synchronized()
        {
            TemplateDebugInfo tdi = createTemplateDebugInfo(templateName);
            tdi.templates.add(new TemplateReference(templateNametemplate));
            // Inject already defined breakpoints into the template
            for (Iterator iter = tdi.breakpoints.iterator(); iter.hasNext();)
            {
                Breakpoint breakpoint = (Breakpointiter.next();
                insertDebugBreak(templatebreakpoint);
            }
        }
    }
    
    {
        return (Collection).clone();
    }
    {
        Object id
        synchronized()
        {
            id = new Long(System.currentTimeMillis());
            .put(idlistener);
        }
        return id;
    }
    
    {
        synchronized()
        {
            .remove(id);
        }
    }
    void addBreakpoint(Breakpoint breakpoint)
    {
        String templateName = breakpoint.getTemplateName();
        synchronized()
        {
            TemplateDebugInfo tdi = createTemplateDebugInfo(templateName);
            List breakpoints = tdi.breakpoints;
            int pos = Collections.binarySearch(breakpointsbreakpoint);
            if(pos < 0)
            {
                // Add to the list of breakpoints
                breakpoints.add(-pos - 1, breakpoint);
                // Inject the breakpoint into all templates with this name
                for (Iterator iter = tdi.templates.iterator(); iter.hasNext();)
                {
                    TemplateReference ref = (TemplateReferenceiter.next();
                    Template t = ref.getTemplate();
                    if(t == null)
                    {
                        iter.remove();
                    }
                    else
                    {
                        insertDebugBreak(tbreakpoint);
                    }
                }
            }
        }
    }
    private static void insertDebugBreak(Template tBreakpoint breakpoint)
    {
        TemplateElement te = findTemplateElement(t.getRootTreeNode(), breakpoint.getLine());
        if(te == null)
        {
            return;
        }
        TemplateElement parent = (TemplateElement)te.getParent();
        DebugBreak db = new DebugBreak(te);
        // TODO: Ensure there always is a parent by making sure
        // that the root element in the template is always a MixedContent
        // Also make sure it doesn't conflict with anyone's code.
        parent.setChildAt(parent.getIndex(te), db);
    }
    private static TemplateElement findTemplateElement(TemplateElement teint line)
    {
        if(te.getBeginLine() > line || te.getEndLine() < line)
        {
            return null;
        }
        // Find the narrowest match
        for(Enumeration children = te.children(); children.hasMoreElements();)
        {
            TemplateElement child = (TemplateElement)children.nextElement();
            TemplateElement childmatch = findTemplateElement(childline);
            if(childmatch != null)
            {
                return childmatch;
            }
        }
        // If no child provides narrower match, return this
        return te;
    }
    
    private TemplateDebugInfo findTemplateDebugInfo(String templateName)
    {
        processRefQueue();
        return (TemplateDebugInfo).get(templateName); 
    }
    
    private TemplateDebugInfo createTemplateDebugInfo(String templateName)
    {
        TemplateDebugInfo tdi = findTemplateDebugInfo(templateName);
        if(tdi == null)
        {
            tdi = new TemplateDebugInfo();
            .put(templateNametdi);
        }
        return tdi;
    }
    
    void removeBreakpoint(Breakpoint breakpoint)
    {
        String templateName = breakpoint.getTemplateName();
        synchronized()
        {
            TemplateDebugInfo tdi = findTemplateDebugInfo(templateName);
            if(tdi != null)
            {
                List breakpoints = tdi.breakpoints;
                int pos = Collections.binarySearch(breakpointsbreakpoint);
                if(pos >= 0)
                { 
                    breakpoints.remove(pos);
                    for (Iterator iter = tdi.templates.iterator(); iter.hasNext();)
                    {
                        TemplateReference ref = (TemplateReferenceiter.next();
                        Template t = ref.getTemplate();
                        if(t == null)
                        {
                            iter.remove();
                        }
                        else
                        {
                            removeDebugBreak(tbreakpoint);
                        }
                    }
                }
                if(tdi.isEmpty())
                {
                    .remove(templateName);
                }
            }
        }
    }
    private void removeDebugBreak(Template tBreakpoint breakpoint)
    {
        TemplateElement te = findTemplateElement(t.getRootTreeNode(), breakpoint.getLine());
        if(te == null)
        {
            return;
        }
        DebugBreak db = null;
        while(te != null)
        {
            if(te instanceof DebugBreak)
            {
                db = (DebugBreak)te;
                break;
            }
            te = (TemplateElement)te.getParent();
        }
        if(db == null)
        {
            return;
        }
        TemplateElement parent = (TemplateElement)db.getParent(); 
        parent.setChildAt(parent.getIndex(db), (TemplateElement)db.getChildAt(0));
    }
    
    void removeBreakpoints(String templateName)
    {
        synchronized()
        {
            TemplateDebugInfo tdi = findTemplateDebugInfo(templateName);
            if(tdi != null)
            {
                removeBreakpoints(tdi);
                if(tdi.isEmpty())
                {
                    .remove(templateName);
                }
            }
        }
    }
    void removeBreakpoints()
    {
        synchronized()
        {
            for (Iterator iter = .values().iterator(); iter.hasNext();)
            {
                TemplateDebugInfo tdi = (TemplateDebugInfoiter.next(); 
                removeBreakpoints(tdi);
                if(tdi.isEmpty())
                {
                    iter.remove();
                }
            }
        }
    }
    private void removeBreakpoints(TemplateDebugInfo tdi)
    {
        tdi.breakpoints.clear();
        for (Iterator iter = tdi.templates.iterator(); iter.hasNext();)
        {
            TemplateReference ref = (TemplateReferenceiter.next();
            Template t = ref.getTemplate();
            if(t == null)
            {
                iter.remove();
            }
            else
            {
                removeDebugBreaks(t.getRootTreeNode());
            }
        }
    }
    
    private void removeDebugBreaks(TemplateElement te)
    {
        int count = te.getChildCount();
        for(int i = 0; i < count; ++i)
        {
            TemplateElement child = (TemplateElement)te.getChildAt(i);
            while(child instanceof DebugBreak)
            {
                TemplateElement dbchild = (TemplateElement)child.getChildAt(0); 
                te.setChildAt(idbchild);
                child = dbchild;
            }
            removeDebugBreaks(child);
        }
    }
    
    private static final class TemplateDebugInfo
    {
        final List templates = new ArrayList();
        final List breakpoints = new ArrayList();
        
        boolean isEmpty()
        {
            return .isEmpty() && .isEmpty();
        }
    }
    
    private static final class TemplateReference extends WeakReference
    {
        final String templateName;
         
        TemplateReference(String templateNameTemplate templateReferenceQueue queue)
        {
            super(templatequeue);
            this. = templateName;
        }
        
        Template getTemplate()
        {
            return (Template)get();
        }
    }
    
    private void processRefQueue()
    {
        for(;;)
        {
            TemplateReference ref = (TemplateReference).poll();
            if(ref == null)
            {
                break;
            }
            TemplateDebugInfo tdi = findTemplateDebugInfo(ref.templateName);
            if(tdi != null)
            {
                tdi.templates.remove(ref);
                if(tdi.isEmpty())
                {
                    .remove(ref.templateName);
                }
            }
        }
    }
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