Quelle JspFactory.java Sprache: JAVA

/*
* 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 jakarta.servlet.jsp;

import jakarta.servlet.Servlet;
import jakarta.servlet.ServletContext;
import jakarta.servlet.ServletRequest;
import jakarta.servlet.ServletResponse;

/**
* 
* The JspFactory is an abstract class that defines a number of factory methods available to a JSP page at runtime for
* the purposes of creating instances of various interfaces and classes used to support the JSP implementation.
* 
* A conformant JSP Engine implementation will, during it's initialization instantiate an implementation dependent
* subclass of this class, and make it globally available for use by JSP implementation classes by registering the
* instance created with this class via the static <code> setDefaultFactory() </code> method.
* 
* The PageContext and the JspEngineInfo classes are the only implementation-dependent classes that can be created from
* the factory.
* 
* JspFactory objects should not be used by JSP page authors.
*/

public abstract class JspFactory {

 private static volatile JspFactory deflt = null;

 /**
 * Sole constructor. (For invocation by subclass constructors, typically implicit.)
 */
 public JspFactory() {
 // NOOP by default
 }

 /**
 * 
 * set the default factory for this implementation. It is illegal for any principal other than the JSP Engine
 * runtime to call this method.
 * 
 *
 * @param deflt The default factory implementation
 */

 public static void setDefaultFactory(JspFactory deflt) {
 JspFactory.deflt = deflt;
 }

 /**
 * Returns the default factory for this implementation.
 *
 * @return the default factory for this implementation
 */

 public static JspFactory getDefaultFactory() {
 return deflt;
 }

 /**
 * 
 * obtains an instance of an implementation dependent jakarta.servlet.jsp.PageContext abstract class for the calling
 * Servlet and currently pending request and response.
 * 
 * 
 * This method is typically called early in the processing of the _jspService() method of a JSP implementation class
 * in order to obtain a PageContext object for the request being processed.
 * 
 * 
 * Invoking this method shall result in the PageContext.initialize() method being invoked. The PageContext returned
 * is properly initialized.
 * 
 * 
 * All PageContext objects obtained via this method shall be released by invoking releasePageContext().
 * 
 *
 * @param servlet the requesting servlet
 * @param request the current request pending on the servlet
 * @param response the current response pending on the servlet
 * @param errorPageURL the URL of the error page for the requesting JSP, or null
 * @param needsSession true if the JSP participates in a session
 * @param buffer size of buffer in bytes, {@link JspWriter#NO_BUFFER} if no buffer,
 * {@link JspWriter#DEFAULT_BUFFER} if implementation default.
 * @param autoflush should the buffer autoflush to the output stream on buffer overflow, or throw an IOException?
 *
 * @return the page context
 *
 * @see jakarta.servlet.jsp.PageContext
 */

 public abstract PageContext getPageContext(Servlet servlet, ServletRequest request, ServletResponse response,
 String errorPageURL, boolean needsSession, int buffer, boolean autoflush);

 /**
 * 
 * called to release a previously allocated PageContext object. Results in PageContext.release() being invoked. This
 * method should be invoked prior to returning from the _jspService() method of a JSP implementation class.
 * 
 *
 * @param pc A PageContext previously obtained by getPageContext()
 */
 public abstract void releasePageContext(PageContext pc);

 /**
 * 
 * called to get implementation-specific information on the current JSP engine.
 * 
 *
 * @return a JspEngineInfo object describing the current JSP engine
 */

 public abstract JspEngineInfo getEngineInfo();

 /**
 * 
 * Obtain the <code>JspApplicationContext</code> instance that was associated within the passed
 * <code>ServletContext</code> for this web application.
 * 
 *
 * @param context the current web application's <code>ServletContext</code>
 *
 * @return <code>JspApplicationContext</code> instance
 *
 * @since JSP 2.1
 */
 public abstract JspApplicationContext getJspApplicationContext(ServletContext context);
}

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