/*
    * 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.config;
  
  import java.util.ArrayList;
  import java.util.Collection;
  import java.util.Collections;
  import java.util.Comparator;
  import java.util.HashMap;
  import java.util.HashSet;
  import java.util.List;
  import java.util.Map;
  import java.util.Set;
  import java.util.concurrent.ConcurrentHashMap;
  import java.util.logging.Level;
  import java.util.logging.Logger;
  
  import javax.el.ELResolver;
  import javax.el.ExpressionFactory;
  import javax.faces.context.ExternalContext;
  import javax.faces.el.PropertyResolver;
  import javax.faces.el.VariableResolver;
  
  import org.apache.commons.collections.Predicate;
  import org.apache.myfaces.config.element.ComponentTagDeclaration;
  import org.apache.myfaces.config.element.FaceletsProcessing;
  import org.apache.myfaces.config.element.ManagedBean;
  import org.apache.myfaces.config.element.NavigationRule;
  import org.apache.myfaces.config.element.ResourceBundle;
  import org.apache.myfaces.config.element.ViewPoolMapping;
  import org.apache.myfaces.config.element.facelets.FaceletTagLibrary;
  
  /**
   * Holds all configuration information (from the faces-config xml files) that is needed later during runtime. The config
   * information in this class is only available to the MyFaces core implementation classes (i.e. the myfaces source
   * tree). See MyfacesConfig for config parameters that can be used for shared or component classes.
   * 
   * @author Manfred Geiler (latest modification by $Author$)
   * @version $Revision$ $Date$
   */
  @SuppressWarnings("deprecation")
  public class RuntimeConfig
  {
      //private static final Log log = LogFactory.getLog(RuntimeConfig.class);
      private static final Logger log = Logger.getLogger(RuntimeConfig.class.getName());
  
      private static final String APPLICATION_MAP_PARAM_NAME = RuntimeConfig.class.getName();
  
      private final Collection<NavigationRule> _navigationRules = new ArrayList<NavigationRule>();
      private final Map<String, ManagedBean> _managedBeans = new HashMap<String, ManagedBean>();
      private boolean _navigationRulesChanged = false;
      private final Map<String, ResourceBundle> _resourceBundles = new HashMap<String, ResourceBundle>();
      private final Map<String, ManagedBean> _oldManagedBeans = new HashMap<String, ManagedBean>();
      
      private String _facesVersion;
      
      private List<ELResolver> facesConfigElResolvers;
      private List<ELResolver> applicationElResolvers;
  
      private VariableResolver _variableResolver;
      private PropertyResolver _propertyResolver;
  
      private ExpressionFactory _expressionFactory;
  
      private PropertyResolver _propertyResolverChainHead;
  
      private VariableResolver _variableResolverChainHead;
      
      private Comparator<ELResolver> _elResolverComparator;
      
      private Predicate _elResolverPredicate;
  
      private final Map<String, org.apache.myfaces.config.element.Converter> _converterClassNameToConfigurationMap =
          new ConcurrentHashMap<String, org.apache.myfaces.config.element.Converter>();
      
      private NamedEventManager _namedEventManager;
      
      private final Map<String, FaceletsProcessing> _faceletsProcessingByFileExtension =
          new HashMap<String, FaceletsProcessing>();
      
      /**
       * JSF 2.2 section 11.4.2.1. 
       * 
      * Scanning for all available contracts is necessary because the spec says 
      * "... if the information from the application configuration resources refers 
      * to a contract that is not available to the application, an informative error 
      * message must be logged. ..."
      */
     private Set<String> _externalContextResourceLibraryContracts = new HashSet<String>();
     private Set<String> _classLoaderResourceLibraryContracts = new HashSet<String>();
     private Set<String> _resourceLibraryContracts = new HashSet<String>();
     
     private Map<String, List<String>> _contractMappings = new HashMap<String, List<String>>();
     
     private List<ComponentTagDeclaration> _componentTagDeclarations = 
             new ArrayList<ComponentTagDeclaration>();
     
     private List<String> _resourceResolvers = new ArrayList<String>();
     
     private List<Object> _injectedObjects = new ArrayList<Object>();
     
     private List<FaceletTagLibrary> _faceletTagLibraries = new ArrayList<FaceletTagLibrary>();
     
     private Map<Integer, String> _namespaceById = new HashMap<Integer, String>();
     private Map<String, Integer> _idByNamespace = new HashMap<String, Integer>();
     
     private List<ViewPoolMapping> _viewPoolMappings = new ArrayList<ViewPoolMapping>();
 
     public static RuntimeConfig getCurrentInstance(ExternalContext externalContext)
     {
         RuntimeConfig runtimeConfig = (RuntimeConfig) externalContext.getApplicationMap().get(
                 APPLICATION_MAP_PARAM_NAME);
         if (runtimeConfig == null)
         {
             runtimeConfig = new RuntimeConfig();
             externalContext.getApplicationMap().put(APPLICATION_MAP_PARAM_NAME, runtimeConfig);
         }
         return runtimeConfig;
     }
 
     public void purge()
     {
         _navigationRules.clear();
         _oldManagedBeans.clear();
         _oldManagedBeans.putAll(_managedBeans);
         _managedBeans.clear();
         _navigationRulesChanged = false;
         _converterClassNameToConfigurationMap.clear();
         _externalContextResourceLibraryContracts.clear();
         _classLoaderResourceLibraryContracts.clear();
         _resourceLibraryContracts.clear();
         _injectedObjects.clear();
         _faceletTagLibraries.clear();
         
         _resourceBundles.clear();
         if (facesConfigElResolvers != null)
         {
             facesConfigElResolvers.clear();
         }
         if (applicationElResolvers != null)
         {
             applicationElResolvers.clear();
         }
         _faceletsProcessingByFileExtension.clear();
         _contractMappings.clear();
         _componentTagDeclarations.clear();
         _resourceResolvers.clear();
         _namespaceById = new HashMap<Integer, String>();
         _idByNamespace = new HashMap<String, Integer>();
         _viewPoolMappings.clear();
     }
 
     /**
      * Return the navigation rules that can be used by the NavigationHandler implementation.
      * 
      * @return a Collection of {@link org.apache.myfaces.config.element.NavigationRule NavigationRule}s
      */
     public Collection<NavigationRule> getNavigationRules()
     {
         return Collections.unmodifiableCollection(_navigationRules);
     }
 
     public void addNavigationRule(NavigationRule navigationRule)
     {
         _navigationRules.add(navigationRule);
 
         _navigationRulesChanged = true;
     }
 
     public boolean isNavigationRulesChanged()
     {
         return _navigationRulesChanged;
     }
 
     public void setNavigationRulesChanged(boolean navigationRulesChanged)
     {
         _navigationRulesChanged = navigationRulesChanged;
     }
 
     /**
      * Return the managed bean info that can be used by the VariableResolver implementation.
      * 
      * @return a {@link org.apache.myfaces.config.element.ManagedBean ManagedBean}
      */
     public ManagedBean getManagedBean(String name)
     {
         return _managedBeans.get(name);
     }
 
     public Map<String, ManagedBean> getManagedBeans()
     {
         return Collections.unmodifiableMap(_managedBeans);
     }
 
     public void addManagedBean(String name, ManagedBean managedBean)
     {
         _managedBeans.put(name, managedBean);
         if(_oldManagedBeans!=null)
         {
             _oldManagedBeans.remove(name);
         }
     }
     
     public void addComponentTagDeclaration(ComponentTagDeclaration declaration)
     {
         _componentTagDeclarations.add(declaration);
     }
     
     public List<ComponentTagDeclaration> getComponentTagDeclarations()
     {
         return Collections.unmodifiableList(_componentTagDeclarations);
     }
     
     public void addFaceletTagLibrary(FaceletTagLibrary library)
     {
         _faceletTagLibraries.add(library);
     }
     
     public List<FaceletTagLibrary> getFaceletTagLibraries()
     {
         return Collections.unmodifiableList(_faceletTagLibraries);
     }
     
     public final void addConverterConfiguration(final String converterClassName,
             final org.apache.myfaces.config.element.Converter configuration)
     {
         checkNull(converterClassName, "converterClassName");
         checkEmpty(converterClassName, "converterClassName");
         checkNull(configuration, "configuration");
 
         _converterClassNameToConfigurationMap.put(converterClassName, configuration);
     }
     
     public org.apache.myfaces.config.element.Converter getConverterConfiguration(String converterClassName)
     {
         return (org.apache.myfaces.config.element.Converter)
                 _converterClassNameToConfigurationMap.get(converterClassName);
     }
     
     private void checkNull(final Object param, final String paramName)
     {
         if (param == null)
         {
             throw new NullPointerException(paramName + " can not be null.");
         }
     }
 
     private void checkEmpty(final String param, final String paramName)
     {
         if (param.length() == 0)
         {
             throw new NullPointerException("String " + paramName + " can not be empty.");
         }
     }
 
     /**
      * Return the resourcebundle which was configured in faces config by var name
      * 
      * @param name
      *            the name of the resource bundle (content of var)
      * @return the resource bundle or null if not found
      */
     public ResourceBundle getResourceBundle(String name)
     {
         return _resourceBundles.get(name);
     }
 
     /**
      * @return the resourceBundles
      */
     public Map<String, ResourceBundle> getResourceBundles()
     {
         return _resourceBundles;
     }
 
     public void addResourceBundle(ResourceBundle bundle)
     {
         if (bundle == null)
         {
             throw new IllegalArgumentException("bundle must not be null");
         }
         String var = bundle.getVar();
         if (_resourceBundles.containsKey(var) && log.isLoggable(Level.WARNING))
         {
             log.warning("Another resource bundle for var '" + var + "' with base name '"
                     + _resourceBundles.get(var).getBaseName() + "' is already registered. '"
                     + _resourceBundles.get(var).getBaseName() + "' will be replaced with '" + bundle.getBaseName()
                     + "'.");
         }
         _resourceBundles.put(var, bundle);
     }
 
     public void addFacesConfigElResolver(ELResolver resolver)
     {
         if (facesConfigElResolvers == null)
         {
             facesConfigElResolvers = new ArrayList<ELResolver>();
         }
         facesConfigElResolvers.add(resolver);
     }
 
     public List<ELResolver> getFacesConfigElResolvers()
     {
         return facesConfigElResolvers;
     }
 
     public void addApplicationElResolver(ELResolver resolver)
     {
         if (applicationElResolvers == null)
         {
             applicationElResolvers = new ArrayList<ELResolver>();
         }
         applicationElResolvers.add(resolver);
     }
 
     public List<ELResolver> getApplicationElResolvers()
     {
         return applicationElResolvers;
     }
 
     public void setVariableResolver(VariableResolver variableResolver)
     {
         _variableResolver = variableResolver;
     }
 
     public VariableResolver getVariableResolver()
     {
         return _variableResolver;
     }
 
     public void setPropertyResolver(PropertyResolver propertyResolver)
     {
         _propertyResolver = propertyResolver;
     }
 
     public PropertyResolver getPropertyResolver()
     {
         return _propertyResolver;
     }
 
     public ExpressionFactory getExpressionFactory()
     {
         return _expressionFactory;
     }
 
     public void setExpressionFactory(ExpressionFactory expressionFactory)
     {
         _expressionFactory = expressionFactory;
     }
 
     public void setPropertyResolverChainHead(PropertyResolver resolver)
     {
         _propertyResolverChainHead = resolver;
     }
 
     public PropertyResolver getPropertyResolverChainHead()
     {
         return _propertyResolverChainHead;
     }
 
     public void setVariableResolverChainHead(VariableResolver resolver)
     {
         _variableResolverChainHead = resolver;
     }
 
     public VariableResolver getVariableResolverChainHead()
     {
         return _variableResolverChainHead;
     }
 
     public Map<String, ManagedBean> getManagedBeansNotReaddedAfterPurge()
     {
         return _oldManagedBeans;
     }
 
     public void resetManagedBeansNotReaddedAfterPurge()
     {
         _oldManagedBeans.clear();
     }
     
     public String getFacesVersion ()
     {
         return _facesVersion;
     }
     
     void setFacesVersion (String facesVersion)
     {
         _facesVersion = facesVersion;
     }
 
     public NamedEventManager getNamedEventManager()
     {
         return _namedEventManager;
     }
 
     public void setNamedEventManager(NamedEventManager namedEventManager)
     {
         this._namedEventManager = namedEventManager;
     }
 
     public Comparator<ELResolver> getELResolverComparator()
     {
         return _elResolverComparator;
     }
     
     public void setELResolverComparator(Comparator<ELResolver> elResolverComparator)
     {
         _elResolverComparator = elResolverComparator;
     }
     
     public Predicate getELResolverPredicate()
     {
         return _elResolverPredicate;
     }
     
     public void setELResolverPredicate(Predicate elResolverPredicate)
     {
         _elResolverPredicate = elResolverPredicate;
     }
     
     public void addFaceletProcessingConfiguration(String fileExtension, FaceletsProcessing configuration)
     {
         checkNull(fileExtension, "fileExtension");
         checkEmpty(fileExtension, "fileExtension");
         checkNull(configuration, "configuration");
 
         this._faceletsProcessingByFileExtension.put(fileExtension, configuration);
     }
     
     public FaceletsProcessing getFaceletProcessingConfiguration(String fileExtensions)
     {
         return _faceletsProcessingByFileExtension.get(fileExtensions);
     }
     
     public Collection<FaceletsProcessing> getFaceletProcessingConfigurations()
     {
         return _faceletsProcessingByFileExtension.values();
     }
 
     /**
      * @return the _externalContextResourceLibraryContracts
      */
     public Set<String> getExternalContextResourceLibraryContracts()
     {
         return _externalContextResourceLibraryContracts;
     }
 
     /**
      * @param externalContextResourceLibraryContracts the _externalContextResourceLibraryContracts to set
      */
     public void setExternalContextResourceLibraryContracts(Set<String> externalContextResourceLibraryContracts)
     {
         this._externalContextResourceLibraryContracts = externalContextResourceLibraryContracts;
         this._resourceLibraryContracts.clear();
         this._resourceLibraryContracts.addAll(this._externalContextResourceLibraryContracts);
         this._resourceLibraryContracts.addAll(this._classLoaderResourceLibraryContracts);
     }
 
     /**
      * @return the _classLoaderResourceLibraryContracts
      */
     public Set<String> getClassLoaderResourceLibraryContracts()
     {
         return _classLoaderResourceLibraryContracts;
     }
 
     /**
      * @param classLoaderResourceLibraryContracts the _classLoaderResourceLibraryContracts to set
      */
     public void setClassLoaderResourceLibraryContracts(Set<String> classLoaderResourceLibraryContracts)
     {
         this._classLoaderResourceLibraryContracts = classLoaderResourceLibraryContracts;
         this._resourceLibraryContracts.clear();
         this._resourceLibraryContracts.addAll(this._externalContextResourceLibraryContracts);
         this._resourceLibraryContracts.addAll(this._classLoaderResourceLibraryContracts);
     }
 
     /**
      * @return the _resourceLibraryContracts
      */
     public Set<String> getResourceLibraryContracts()
     {
         return _resourceLibraryContracts;
     }
 
     /**
      * @return the _contractMappings
      */
     public Map<String, List<String>> getContractMappings()
     {
         return _contractMappings;
     }
 
     public void addContractMapping(String urlPattern, String[] contracts)
     {
         List<String> contractsList = _contractMappings.get(urlPattern);
         if (contractsList == null)
         {
             contractsList = new ArrayList<String>();
             _contractMappings.put(urlPattern, contractsList);
         }
         for (String contract : contracts)
         {
             contractsList.add(contract);
         }
     }
     
     public void addContractMapping(String urlPattern, String contract)
     {
         List<String> contractsList = _contractMappings.get(urlPattern);
         if (contractsList == null)
         {
             contractsList = new ArrayList<String>();
             _contractMappings.put(urlPattern, contractsList);
         }
         contractsList.add(contract);
     }    
     
     public List<String> getResourceResolvers()
     {
         return _resourceResolvers;
     }
     
     public void addResourceResolver(String resourceResolver)
     {
         _resourceResolvers.add(resourceResolver);
     }
 
     /**
      * @return the _injectedObjects
      */
     public List<Object> getInjectedObjects()
     {
         return _injectedObjects;
     }
 
     public void addInjectedObject(Object object)
     {
         _injectedObjects.add(object);
     }
 
     public Map<Integer, String> getNamespaceById()
     {
         return _namespaceById;
     }
 
     public void setNamespaceById(Map<Integer, String> namespaceById)
     {
         this._namespaceById = namespaceById;
     }
 
     public Map<String, Integer> getIdByNamespace()
     {
         return _idByNamespace;
     }
 
     public void setIdByNamespace(Map<String, Integer> idByNamespace)
     {
         this._idByNamespace = idByNamespace;
     }
 
     public List<ViewPoolMapping> getViewPoolMappings()
     {
         return _viewPoolMappings;
     }
     
     public void addViewPoolMapping(ViewPoolMapping mapping)
     {
         _viewPoolMappings.add(mapping);
     }
 }