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如何自由组织Tapestry页面规范文件


  问题的提出:
  默认Tapestry的页面模板文件(.html)及其对应的规范文件(.page),可以放在web根目录或其下的WEB-INF/目录中,Tapestry可以不用任何配置(在以前的版本中需要在.application文件中定义一下页面)就能正确运行,如果你需要在这些根目录下以文件系统的目录形式组织你的页面,则Tapestry是不会自动搜索这些子目录的,你必须在.application文件中定义这些不在默认位置的页面。这样一来,每加一个页面都需要定义一下,如果页面数目众多,定义起来就会比较麻烦,如何才能避免这些配置呢?本文的目的就是尝试解决这个问题。
  
  问题的解决:
  本文是在参考文档(http://www.behindthesite.com/blog/C1931765677/E381917869/index.html)源代码的基础上稍作修改而成,主要是为了解决不能在Tomcat中使用的问题。为了更好的了解,朋友们最好能阅读一下原文和原来的代码。主要修改的地方是给RecursiveFileLocator传递一个真实路径地址,以便能够列出目录下面的子目录,从而实现层次查找。
  
  解决的途径就是定义一个ISpecificationResolverDelegate,以便Tapestry在常规路径下找不到文件时进行处理。
    CustomSpecificationResolver.java:
  
  // CustomSpecificationResolver.java
  //
  // Copyright 2004 Michael J. Henderson & Associates LLC
  //
  // 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 com.mjhenderson.users.tapestry;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.tapestry.INamespace;
  import org.apache.tapestry.IRequestCycle;
  import org.apache.tapestry.IResourceLocation;
  import org.apache.tapestry.Tapestry;
  import org.apache.tapestry.engine.ISpecificationSource;
  import org.apache.tapestry.resolver.ISpecificationResolverDelegate;
  import org.apache.tapestry.spec.IComponentSpecification;
  
  /**
   * @author <a href="mailto:[email protected]?subject=com.mjhenderson.users.tapestry.CustomSpecificationResolver">Mike Henderson</a>
   *
   */
  public class CustomSpecificationResolver implements
      ISpecificationResolverDelegate {
    
  
    private static final Log LOG = LogFactory.getLog(RecursiveFileLocator.class);
  
    private ISpecificationSource _specificationSource;
  
    private RecursiveFileLocator _locator;
    //private boolean _applicationIsExplodedWAR;
    private boolean _initialized;
    private String _folder;
    private String _realRootFolder;
    
    public CustomSpecificationResolver() {;
    }
    
    public void setFolder(String value) {
      _folder = value;
    }
    
    public String getFolder() {
      return _folder;
    }
    
    private void _init(IRequestCycle cycle) {
        //IResourceLocation rootLocation = Tapestry.getApplicationRootLocation(cycle).getRelativeLocation("/WEB-INF/");
      IResourceLocation rootLocation = Tapestry.getApplicationRootLocation(cycle).getRelativeLocation("/");
      //_applicationIsExplodedWAR = rootLocation.getResourceURL().toString().startsWith("file:");
      //if (_applicationIsExplodedWAR) {
      _realRootFolder = cycle.getRequestContext().getServlet().getServletContext().getRealPath("/");
      _locator = new RecursiveFileLocator(rootLocation,_realRootFolder);
      _specificationSource = cycle.getEngine().getSpecificationSource();
      //}
      _initialized = true;
    }
    
  //  private boolean checkLocationIsFileLocation(IResourceLocation location) {
  //    String url = location.getResourceURL().toString();
  //    System.out.println("url = "+url);
  //    return url.startsWith("file:");
  //  }
    
    /**
     * @see org.apache.tapestry.resolver.ISpecificationResolverDelegate#findPageSpecification(org.apache.tapestry.IRequestCycle, org.apache.tapestry.INamespace, java.lang.String)
     */
    public IComponentSpecification findPageSpecification(IRequestCycle cycle,
        INamespace namespace, String name) {
  
      if (!_initialized) {
        _init(cycle);
      }
      //if (!_applicationIsExplodedWAR) {
      //  return null;
      //}
      IResourceLocation location = _locator.resolveLocation(name+".page");
      if (location != null) {
        return _specificationSource.getPageSpecification(location);
      }
      return null;
    }
  
    /**
     * @see org.apache.tapestry.resolver.ISpecificationResolverDelegate#findComponentSpecification(org.apache.tapestry.IRequestCycle, org.apache.tapestry.INamespace, java.lang.String)
     */
    public IComponentSpecification findComponentSpecification(
        IRequestCycle cycle, INamespace namespace, String type) {
      
      if (!_initialized) {
        _init(cycle);
      }
      //if (!_applicationIsExplodedWAR) {
      //  return null;
      //}
      IResourceLocation location = _locator.resolveLocation(type+".jwc");
      if (location != null) {
        return _specificationSource.getComponentSpecification(location);
      }
      return null;
    }
  
  }
  RecursiveFileLocator.java:
  
  // RecursiveFileLocator.java
  //
  // Copyright 2004 Michael J. Henderson & Associates LLC
  //
  // 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 com.mjhenderson.users.tapestry;
  
  import java.io.File;
  import java.net.URL;
  import java.util.ArrayList;
  import java.util.HashMap;
  import java.util.Iterator;
  import java.util.List;
  import java.util.Map;
  
  import org.apache.commons.logging.Log;
  import org.apache.commons.logging.LogFactory;
  import org.apache.tapestry.IResourceLocation;
  
  /**
   * @author <a href="mailto:[email protected]?subject=com.mjhenderson.users.tapestry.RecursiveFileLocator">Mike Henderson</a>
   *
   */
  public class RecursiveFileLocator {
    
    private static final Log LOG = LogFactory.getLog(RecursiveFileLocator.class);
  
    private IResourceLocation  _location;
    
    private File realRoot ;
    
    private Map _locations   = new HashMap();
    
    public RecursiveFileLocator(IResourceLocation location,String _realRootFolder) {
      realRoot = new
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