package org.trails.page;

 import org.apache.commons.logging.Log;

 import org.apache.commons.logging.LogFactory;

 import org.apache.hivemind.impl.MessageFormatter;

 import org.apache.hivemind.util.Defense;

 import org.apache.tapestry.IPage;

 import org.apache.tapestry.IRequestCycle;

 import org.apache.tapestry.PageNotFoundException;

 import java.util.HashMap;

 import java.util.Map;

 public class DefaultPageResolver implements PageResolver

 {

         private static final Log LOG = LogFactory.getLog(DefaultPageResolver.class);

         private String defaultPrefix = "Default";

         private boolean cacheDisabled = System.getProperty("org.apache.tapestry.disable-caching") != null;

         private Map<PageType, String> postFixMap;

         public String getPostFix(PageType pageType)

         {

                 return getPostFixMap().get(pageType);

         }

         public IPage resolvePage(IRequestCycle cycle, Class type, PageType pageType)

         {

                 Defense.notNull(type, "type");

                 Defense.notNull(pageType, "pageType");

                 String pageName = type.getSimpleName() + getPostFix(pageType);

                 IPage page = null;

                 try

                 {

                         page = cycle.getPage(pageName);

                 } catch (PageNotFoundException ae)

                 {

                         page = cycle.getPage(getDefaultPrefix() + getPostFix(pageType));

                         if (!cacheDisabled)

                         {

                                 if (LOG.isDebugEnabled())

                                         LOG.debug(_formatter.format("installing-page", pageName, page.getNamespace(), page.getSpecification()));

                                 page.getNamespace().installPageSpecification(pageName, page.getSpecification());

                                 page = cycle.getPage(pageName);

                         }

                 }

                 return page;

         }

         public Map<PageType, String> getPostFixMap()

         {

                 return postFixMap;

         }

         public void setPostFixMap(Map<PageType, String> postFixMap)

         {

                 this.postFixMap = postFixMap;

         }

         public DefaultPageResolver()

         {

                 postFixMap = new HashMap<PageType, String>();

                 for (PageType pageType : PageType.values())

                 {

                         postFixMap.put(pageType, pageType.toString());

                 }

         }

         public String getDefaultPrefix()

         {

                 return defaultPrefix;

         }

         public void setDefaultPrefix(String defaultPostfix)

         {

                 this.defaultPrefix = defaultPostfix;

         }

         public void setCacheDisabled(boolean cacheDisabled)

         {

                 this.cacheDisabled = cacheDisabled;

         }

         private static final MessageFormatter _formatter = new MessageFormatter(LOG, "org.apache.tapestry.resolver.ResolverStrings");

 }