/*
    * Licensed to the Apache Software Foundation (ASF) under one
    * or more contributor license agreements.  See the NOTICE file
    * distributed with this work for additional information
    * regarding copyright ownership.  The ASF licenses this file
    * to you under the Apache License, Version 2.0 (the
    * "License"); you may not use this file except in compliance
    * with the License.  You may obtain a copy of the License at
    *
   *   http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing,
   * software distributed under the License is distributed on an
   * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
   * KIND, either express or implied.  See the License for the
   * specific language governing permissions and limitations
   * under the License.
   */
  package org.apache.myfaces.view.facelets.compiler;
  
  import java.io.IOException;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import java.util.Set;
  import javax.el.ValueExpression;
  import javax.faces.FacesException;
  import javax.faces.component.ContextCallback;
  import javax.faces.component.UIComponent;
  import javax.faces.component.UINamingContainer;
  import javax.faces.component.UIViewRoot;
  import javax.faces.component.UniqueIdVendor;
  import javax.faces.component.visit.VisitCallback;
  import javax.faces.component.visit.VisitContext;
  import javax.faces.context.FacesContext;
  import javax.faces.el.ValueBinding;
  import javax.faces.event.AbortProcessingException;
  import javax.faces.event.ComponentSystemEvent;
  import javax.faces.event.FacesEvent;
  import javax.faces.event.FacesListener;
  import javax.faces.render.Renderer;
  
  import javax.faces.view.Location;
  import org.apache.commons.collections.iterators.EmptyIterator;
  import org.apache.myfaces.view.facelets.tag.jsf.ComponentSupport;
  
  class UILeaf extends UIComponent implements Map<String, Object>
  {
      //-------------- START TAKEN FROM UIComponentBase ----------------
      private static final String _STRING_BUILDER_KEY
              = "javax.faces.component.UIComponentBase.SHARED_STRING_BUILDER";
      
      private String _clientId = null;
      
      private String _id = null;
  
      public String getClientId(FacesContext context)
      {
          if (context == null)
          {
              throw new NullPointerException("context");
          }
  
          if (_clientId != null)
          {
              return _clientId;
          }
  
          //boolean idWasNull = false;
          String id = getId();
          if (id == null)
          {
              // Although this is an error prone side effect, we automatically create a new id
              // just to be compatible to the RI
              
              // The documentation of UniqueIdVendor says that this interface should be implemented by
              // components that also implements NamingContainer. The only component that does not implement
              // NamingContainer but UniqueIdVendor is UIViewRoot. Anyway we just can't be 100% sure about this
              // fact, so it is better to scan for the closest UniqueIdVendor. If it is not found use 
              // viewRoot.createUniqueId, otherwise use UniqueIdVendor.createUniqueId(context,seed).
              UniqueIdVendor parentUniqueIdVendor = _ComponentUtils.findParentUniqueIdVendor(this);
              if (parentUniqueIdVendor == null)
              {
                  UIViewRoot viewRoot = context.getViewRoot();
                  if (viewRoot != null)
                  {
                      id = viewRoot.createUniqueId();
                  }
                  else
                  {
                      // The RI throws a NPE
                      String location = getComponentLocation(this);
                      throw new FacesException("Cannot create clientId. No id is assigned for component"
                              + " to create an id and UIViewRoot is not defined: "
                              + getPathToComponent(this)
                             + (location != null ? " created from: " + location : ""));
                 }
             }
             else
             {
                 id = parentUniqueIdVendor.createUniqueId(context, null);
             }
             setId(id);
             // We remember that the id was null and log a warning down below
             // idWasNull = true;
         }
 
         UIComponent namingContainer = _ComponentUtils.findParentNamingContainer(this, false);
         if (namingContainer != null)
         {
             String containerClientId = namingContainer.getContainerClientId(context);
             if (containerClientId != null)
             {
                 StringBuilder bld = _getSharedStringBuilder(context);
                 _clientId = bld.append(containerClientId).append(
                                       UINamingContainer.getSeparatorChar(context)).append(id).toString();
             }
             else
             {
                 _clientId = id;
             }
         }
         else
         {
             _clientId = id;
         }
 
         Renderer renderer = getRenderer(context);
         if (renderer != null)
         {
             _clientId = renderer.convertClientId(context, _clientId);
         }
 
         // -=Leonardo Uribe=- In jsf 1.1 and 1.2 this warning has sense, but in jsf 2.0 it is common to have
         // components without any explicit id (UIViewParameter components and UIOuput resource components) instances.
         // So, this warning is becoming obsolete in this new context and should be removed.
         //if (idWasNull && log.isLoggable(Level.WARNING))
         //{
         //    log.warning("WARNING: Component " + _clientId
         //            + " just got an automatic id, because there was no id assigned yet. "
         //            + "If this component was created dynamically (i.e. not by a JSP tag) you should assign it an "
         //            + "explicit static id or assign it the id you get from "
         //            + "the createUniqueId from the current UIViewRoot "
         //            + "component right after creation! Path to Component: " + getPathToComponent(this));
         //}
 
         return _clientId;
     }
     
     public String getId()
     {
         return _id;
     }
     
     @Override
     public void setId(String id)
     {
         isIdValid(id);
         _id = id;
         _clientId = null;
     }
     
     private void isIdValid(String string)
     {
 
         // is there any component identifier ?
         if (string == null)
         {
             return;
         }
 
         // Component identifiers must obey the following syntax restrictions:
         // 1. Must not be a zero-length String.
         if (string.length() == 0)
         {
             throw new IllegalArgumentException("component identifier must not be a zero-length String");
         }
 
         // If new id is the same as old it must be valid
         if (string.equals(_id))
         {
             return;
         }
 
         // 2. First character must be a letter or an underscore ('_').
         if (!Character.isLetter(string.charAt(0)) && string.charAt(0) != '_')
         {
             throw new IllegalArgumentException("component identifier's first character must be a letter "
                                                + "or an underscore ('_')! But it is \""
                                                + string.charAt(0) + "\"");
         }
         for (int i = 1; i < string.length(); i++)
         {
             char c = string.charAt(i);
             // 3. Subsequent characters must be a letter, a digit, an underscore ('_'), or a dash ('-').
             if (!Character.isLetterOrDigit(c) && c != '-' && c != '_')
             {
                 throw new IllegalArgumentException("Subsequent characters of component identifier must be a letter, "
                                                    + "a digit, an underscore ('_'), or a dash ('-')! "
                                                    + "But component identifier contains \""
                                                    + c + "\"");
             }
         }
     }
     
     private String getComponentLocation(UIComponent component)
     {
         Location location = (Location) component.getAttributes()
                 .get(UIComponent.VIEW_LOCATION_KEY);
         if (location != null)
         {
             return location.toString();
         }
         return null;
     }
 
     private String getPathToComponent(UIComponent component)
     {
         StringBuffer buf = new StringBuffer();
 
         if (component == null)
         {
             buf.append("{Component-Path : ");
             buf.append("[null]}");
             return buf.toString();
         }
 
         getPathToComponent(component, buf);
 
         buf.insert(0, "{Component-Path : ");
         buf.append("}");
 
         return buf.toString();
     }
 
     private void getPathToComponent(UIComponent component, StringBuffer buf)
     {
         if (component == null)
         {
             return;
         }
 
         StringBuffer intBuf = new StringBuffer();
 
         intBuf.append("[Class: ");
         intBuf.append(component.getClass().getName());
         if (component instanceof UIViewRoot)
         {
             intBuf.append(",ViewId: ");
             intBuf.append(((UIViewRoot) component).getViewId());
         }
         else
         {
             intBuf.append(",Id: ");
             intBuf.append(component.getId());
         }
         intBuf.append("]");
 
         buf.insert(0, intBuf.toString());
 
         getPathToComponent(component.getParent(), buf);
     }
     
     static StringBuilder _getSharedStringBuilder(FacesContext facesContext)
     {
         Map<Object, Object> attributes = facesContext.getAttributes();
 
         StringBuilder sb = (StringBuilder) attributes.get(_STRING_BUILDER_KEY);
 
         if (sb == null)
         {
             sb = new StringBuilder();
             attributes.put(_STRING_BUILDER_KEY, sb);
         }
         else
         {
 
             // clear out the stringBuilder by setting the length to 0
             sb.setLength(0);
         }
 
         return sb;
     }
 
     //-------------- END TAKEN FROM UICOMPONENTBASE ------------------
     
 
     private static Map<String, UIComponent> facets = new HashMap<String, UIComponent>()
     {
 
         @Override
         public void putAll(Map<? extends String, ? extends UIComponent> map)
         {
             // do nothing
         }
 
         @Override
         public UIComponent put(String name, UIComponent value)
         {
             return null;
         }
     };
 
     private UIComponent parent;
     
     //private _ComponentAttributesMap attributesMap;
 
     @Override
     public Map<String, Object> getAttributes()
     {
         // Since all components extending UILeaf are only transient references
         // to text or instructions, we can do the following simplifications:  
         // 1. Don't use reflection to retrieve properties, because it will never
         // be done
         // 2. Since the only key that will be saved here is MARK_ID, we can create
         // a small map of size 2. In practice, this will prevent create a lot of
         // maps, like the ones used on state helper
         return this;
     }
 
     @Override
     public void clearInitialState()
     {
        //this component is transient, so it can be marked, because it does not have state!
     }
 
     @Override
     public boolean initialStateMarked()
     {
         //this component is transient, so it can be marked, because it does not have state!
         return false;
     }
 
     @Override
     public void markInitialState()
     {
         //this component is transient, so no need to do anything
     }
 
     
     @Override
     public void processEvent(ComponentSystemEvent event)
             throws AbortProcessingException
     {
         //Do nothing, because UILeaf will not need to handle "binding" property
     }
 
     @Override
     @SuppressWarnings("deprecation")
     public ValueBinding getValueBinding(String binding)
     {
         return null;
     }
 
     @Override
     @SuppressWarnings("deprecation")
     public void setValueBinding(String name, ValueBinding binding)
     {
         // do nothing
     }
 
     @Override
     public ValueExpression getValueExpression(String name)
     {
         return null;
     }
 
     @Override
     public void setValueExpression(String name, ValueExpression arg1)
     {
         // do nothing
     }
 
     public String getFamily()
     {
         return "facelets.LiteralText";
     }
 
     @Override
     public UIComponent getParent()
     {
         return this.parent;
     }
 
     @Override
     public void setParent(UIComponent parent)
     {
         this.parent = parent;
     }
 
     @Override
     public boolean isRendered()
     {
         return true;
     }
 
     @Override
     public void setRendered(boolean rendered)
     {
         // do nothing
     }
 
     @Override
     public String getRendererType()
     {
         return null;
     }
 
     @Override
     public void setRendererType(String rendererType)
     {
         // do nothing
     }
 
     @Override
     public boolean getRendersChildren()
     {
         return true;
     }
 
     @Override
     public List<UIComponent> getChildren()
     {
         List<UIComponent> children = Collections.emptyList();
         return children;
     }
 
     @Override
     public int getChildCount()
     {
         return 0;
     }
 
     @Override
     public UIComponent findComponent(String id)
     {
         return null;
     }
 
     @Override
     public Map<String, UIComponent> getFacets()
     {
         return facets;
     }
 
     @Override
     public int getFacetCount()
     {
         return 0;
     }
 
     @Override
     public UIComponent getFacet(String name)
     {
         return null;
     }
 
     @SuppressWarnings("unchecked")
     @Override
     public Iterator<UIComponent> getFacetsAndChildren()
     {
         // Performance: Collections.emptyList() is Singleton,
         // but .iterator() creates new instance of AbstractList$Itr every invocation, because
         // emptyList() extends AbstractList.  Therefore we cannot use Collections.emptyList() here. 
         return EmptyIterator.INSTANCE;
     }
 
     @Override
     public void broadcast(FacesEvent event) throws AbortProcessingException
     {
         // do nothing
     }
 
     @Override
     public void decode(FacesContext faces)
     {
         // do nothing
     }
 
     @Override
     public void encodeBegin(FacesContext faces) throws IOException
     {
         // do nothing
     }
 
     @Override
     public void encodeChildren(FacesContext faces) throws IOException
     {
         // do nothing
     }
 
     @Override
     public void encodeEnd(FacesContext faces) throws IOException
     {
         // do nothing
     }
 
     @Override
     public void encodeAll(FacesContext faces) throws IOException
     {
         this.encodeBegin(faces);
     }
 
     @Override
     protected void addFacesListener(FacesListener faces)
     {
         // do nothing
     }
 
     @Override
     protected FacesListener[] getFacesListeners(Class faces)
     {
         return null;
     }
 
     @Override
     protected void removeFacesListener(FacesListener faces)
     {
         // do nothing
     }
 
     @Override
     public void queueEvent(FacesEvent event)
     {
         // do nothing
     }
 
     @Override
     public void processRestoreState(FacesContext faces, Object state)
     {
         // do nothing
     }
 
     @Override
     public void processDecodes(FacesContext faces)
     {
         // do nothing
     }
 
     @Override
     public void processValidators(FacesContext faces)
     {
         // do nothing
     }
 
     @Override
     public void processUpdates(FacesContext faces)
     {
         // do nothing
     }
 
     @Override
     public Object processSaveState(FacesContext faces)
     {
         return null;
     }
 
     @Override
     protected FacesContext getFacesContext()
     {
         return FacesContext.getCurrentInstance();
     }
 
     @Override
     protected Renderer getRenderer(FacesContext faces)
     {
         return null;
     }
 
     public Object saveState(FacesContext faces)
     {
         return null;
     }
 
     public void restoreState(FacesContext faces, Object state)
     {
         // do nothing
     }
 
     public boolean isTransient()
     {
         return true;
     }
 
     public void setTransient(boolean tranzient)
     {
         // do nothing
     }
 
     @Override
     public boolean invokeOnComponent(FacesContext context, String clientId, ContextCallback callback)
             throws FacesException
     {
         //this component will never be a target for a callback, so always return false.
         return false;
     }
 
     @Override
     public boolean visitTree(VisitContext context, VisitCallback callback)
     {
         // the visiting is complete and it shouldn't affect the visiting of the other
         // children of the parent component, therefore return false
         return false;
     }
 
     //-------------- START ATTRIBUTE MAP IMPLEMENTATION ----------------
 
     private Map<String, Object> _attributes = null;
     private String _markCreated = null;
 
     public void setMarkCreated(String markCreated)
     {
         _markCreated = markCreated;
     }
 
     public int size()
     {
         return _attributes == null ? 0 : _attributes.size();
     }
          
     public void clear()
     {
         if (_attributes != null)
         {
          _attributes.clear();
         _markCreated = null;
         }
     }
          
     public boolean isEmpty()
     {
         if (_markCreated == null)
         {
             return _attributes == null ? false : _attributes.isEmpty();
         }
         else
         {
             return false;
         }
     }
          
     public boolean containsKey(Object key)
     {
         checkKey(key);
 
         if (ComponentSupport.MARK_CREATED.equals(key))
         {
             return _markCreated != null;
         }
         else
         {
             return (_attributes == null ? false :_attributes.containsKey(key));
         }
     }
          
     public boolean containsValue(Object value)
     {
         if (_markCreated != null && _markCreated.equals(value))
         {
             return true;
         }
         return (_attributes == null) ? false : _attributes.containsValue(value);
     }
 
     public Collection<Object> values()
     {
         return getUnderlyingMap().values();
     }
 
     public void putAll(Map<? extends String, ? extends Object> t)
     {
         for (Map.Entry<? extends String, ? extends Object> entry : t.entrySet())
         {
             put(entry.getKey(), entry.getValue());
         }
     }
 
     public Set<Entry<String, Object>> entrySet()
     {
         return getUnderlyingMap().entrySet();
     }
 
     public Set<String> keySet()
     {
         return getUnderlyingMap().keySet();
     }
 
     public Object get(Object key)
     {
         checkKey(key);
 
         if ("rendered".equals(key))
         {
             return true;
         }
         if ("transient".equals(key))
         {
             return true;
         }
         if (ComponentSupport.MARK_CREATED.equals(key))
         {
             return _markCreated;
         }
         return (_attributes == null) ? null : _attributes.get(key);
     }
 
     public Object remove(Object key)
     {
         checkKey(key);
 
         if (ComponentSupport.MARK_CREATED.equals(key))
         {
             _markCreated = null;
         }
          return (_attributes == null) ? null : _attributes.remove(key);
     }
          
     public Object put(String key, Object value)
     {
         checkKey(key);
 
         if (ComponentSupport.MARK_CREATED.equals(key))
         {
             String old = _markCreated;
             _markCreated = (String) value;
             return old;
         }
         return getUnderlyingMap().put(key, value);
     }
 
     private void checkKey(Object key)
     {
         if (key == null)
         {
             throw new NullPointerException("key");
         }
         if (!(key instanceof String))
         {
             throw new ClassCastException("key is not a String");
         }
     }
 
     Map<String, Object> getUnderlyingMap()
     {
         if (_attributes == null)
         {
             _attributes = new HashMap<String, Object>(2,1);
         }
         return _attributes;
     }
 
 }