definitionsfactory.java

这是一个轻便的j2ee的web应用框架,是一个在多个项目中运用的实际框架,采用struts,hebinate,xml等技术,有丰富的tag,role,navigation,session,dictio

/*
 * $Header: /sfroot/cvs/esimple/src/core/org/apache/struts/tiles/xmlDefinition/DefinitionsFactory.java,v 1.1.1.1 2004/09/08 06:38:38 lava Exp $
 * $Revision: 1.1.1.1 $
 * $Date: 2004/09/08 06:38:38 $
 *
 * ====================================================================
 *
 * The Apache Software License, Version 1.1
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 * reserved.
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 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
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 * 1. Redistributions of source code must retain the above copyright
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 * 2. Redistributions in binary form must reproduce the above copyright
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 * 3. The end-user documentation included with the redistribution, if
 *    any, must include the following acknowlegement:
 *       "This product includes software developed by the
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 *    Alternately, this acknowlegement may appear in the software itself,
 *    if and wherever such third-party acknowlegements normally appear.
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 *    Foundation" must not be used to endorse or promote products derived
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package org.apache.struts.tiles.xmlDefinition;

import org.apache.struts.tiles.ComponentDefinition;
import org.apache.struts.tiles.DefinitionsFactoryException;
import org.apache.struts.tiles.NoSuchDefinitionException;

import java.util.Map;
import java.util.HashMap;
import java.util.Iterator;
import java.io.Serializable;

import javax.servlet.ServletContext;
import javax.servlet.ServletRequest;

/**
 * A factory for definitions.
 * This factory allows to retrieve definitions by their keys.
 */
public class DefinitionsFactory implements Serializable
{
     /** Underlying map containing all definitions.*/
   protected Map definitions;

   /**
     * Get a definition by its name.
     * @param name Name of the definition.
     * @param request Servlet request.
     * @param servletContext Servlet context.
     * @throws DefinitionsFactoryException An error occur while getting
     * definition.
     * @throws NoSuchDefinitionException No definition found for specified name
     * Implementation can throw more accurate exception as a subclass of this
     * exception.
     */
   public ComponentDefinition getDefinition(String name, ServletRequest request, ServletContext servletContext)
             throws NoSuchDefinitionException, DefinitionsFactoryException
   {
   return (ComponentDefinition)definitions.get(name);
   }

  /**
   * Put definition in set.
   * @param definition Definition to put.
   */
  public void putDefinition(ComponentDefinition definition)
  {
  definitions.put( definition.getName(), definition );
  }

   /**
    * Constructor.
    * Create a factory initialized with definitions from {@link XmlDefinitionsSet}.
    * @param xmlDefinitions Resolved definition from XmlDefinitionSet.
    * @throws NoSuchDefinitionException If an error occurs while resolving inheritance
    */
   public DefinitionsFactory(XmlDefinitionsSet xmlDefinitions)
    throws NoSuchDefinitionException
    {
    definitions = new HashMap();

      // First, resolve inheritance
    xmlDefinitions.resolveInheritances();

      // Walk thru xml set and copy each definitions.
    Iterator i = xmlDefinitions.getDefinitions().values().iterator();
    while( i.hasNext() )
      {
      XmlDefinition xmlDefinition = (XmlDefinition)i.next();
        putDefinition( new ComponentDefinition( xmlDefinition) );
      }  // end loop
   }
    /**
     * Return String representation.
     * @return String representation.
     */
  public String toString()
    {
    return definitions.toString();
    }

}