/*

  * Copyright 2004-2008 the Seasar Foundation and the Others.

  *

  * Licensed 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.seasar.uruma.core.impl;

 import java.util.ArrayList;

 import java.util.HashMap;

 import java.util.List;

 import java.util.Map;

 import org.seasar.framework.util.Disposable;

 import org.seasar.framework.util.DisposableUtil;

 import org.seasar.framework.util.StringUtil;

 import org.seasar.uruma.component.Template;

 import org.seasar.uruma.component.UIComponentContainer;

 import org.seasar.uruma.component.factory.ComponentTreeBuilder;

 import org.seasar.uruma.core.TemplateManager;

 import org.seasar.uruma.core.UrumaMessageCodes;

 import org.seasar.uruma.exception.DuplicateIdTemplateException;

 import org.seasar.uruma.exception.NotFoundException;

 import org.seasar.uruma.log.UrumaLogger;

 /**

  * {@link TemplateManager} の実装クラスです。<br />

  * 

  * @author y-komori

  */

 public class TemplateManagerImpl implements TemplateManager {

     private static final UrumaLogger logger = UrumaLogger

             .getLogger(TemplateManager.class);

     private Map<String, Template> templateCache = new HashMap<String, Template>();

     private Map<String, String> idToPathMap = new HashMap<String, String>();

     private ComponentTreeBuilder builder = new ComponentTreeBuilder();

     private static boolean initialized = false;

     /*

      * @see org.seasar.uruma.core.TemplateManager#getTemplate(java.lang.String)

      */

     public Template getTemplate(final String path) {

         synchronized (templateCache) {

             if (!initialized) {

                 DisposableUtil.add(new Disposable() {

                     public void dispose() {

                         clear();

                         initialized = false;

                     }

                 });

                 initialized = true;

             }

             Template template = templateCache.get(path);

             if (template == null) {

                 logger.log(UrumaMessageCodes.LOAD_TEMPLATE_FROM_FILE, path);

                 template = builder.build(path);

                 if (template != null) {

                     templateCache.put(path, template);

                     String id = template.getRootComponent().getId();

                     if (StringUtil.isNotBlank(id)) {

                         if (!idToPathMap.containsKey(id)) {

                             idToPathMap.put(id, path);

                             String type = template.getRootComponent()

                                     .getClass().getSimpleName();

                             logger.log(UrumaMessageCodes.TEMPLATE_REGISTERED,

                                     id, type, path);

                         } else {

                             if (!idToPathMap.get(id).equals(path)) {

                                 throw new DuplicateIdTemplateException(id, path);

                             }

                         }

                     }

                 }

             } else {

                 logger.log(UrumaMessageCodes.LOAD_TEMPLATE_FROM_CACHE, path);

             }

             return template;

         }

     }

     /*

      * @see

      * org.seasar.uruma.core.TemplateManager#getTemplateById(java.lang.String)

      */

     public Template getTemplateById(final String id) {

         String path = idToPathMap.get(id);

         if (path != null) {

             return getTemplate(path);

         } else {

             throw new NotFoundException(UrumaMessageCodes.TEMPLATE_NOT_FOUND,

                     id);

         }

     }

     /*

      * @see org.seasar.uruma.core.TemplateManager#getTemplates(java.lang.Class)

      */

     public List<Template> getTemplates(

             final Class<? extends UIComponentContainer> componentClass) {

         List<Template> templates = new ArrayList<Template>();

         for (String path : idToPathMap.values()) {

             Template template = getTemplate(path);

             UIComponentContainer root = template.getRootComponent();

             if ((root != null) && componentClass.equals(root.getClass())) {

                 templates.add(template);

             }

         }

         return templates;

     }

     /*

      * @see org.seasar.uruma.core.TemplateManager#loadTemplates(java.util.List)

      */

     public void loadTemplates(final List<String> pathList) {

         for (String path : pathList) {

             getTemplate(path);

         }

     }

     /*

      * @see org.seasar.uruma.core.TemplateManager#clear()

      */

     public void clear() {

         logger.log(UrumaMessageCodes.DELETE_ALL_TEMPLATE_FROM_CACHE);

         templateCache.clear();

     }

     /*

      * @see org.seasar.uruma.core.TemplateManager#remove(java.lang.String)

      */

     public void remove(final String id) {

         String path = idToPathMap.get(id);

         if (path != null) {

             logger.log(UrumaMessageCodes.DELETE_TEMPLATE_FROM_CACHE);

             templateCache.remove(path);

         }

     }

 }