JspFactory.java
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上传日期:2022-07-20
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数据库编程
开发平台:
Java
- /*
- * The Apache Software License, Version 1.1
- *
- * Copyright (c) 1999 The Apache Software Foundation. All rights
- * reserved.
- *
- * Redistribution and use in source and binary forms, with or without
- * modification, are permitted provided that the following conditions
- * are met:
- *
- * 1. Redistributions of source code must retain the above copyright
- * notice, this list of conditions and the following disclaimer.
- *
- * 2. Redistributions in binary form must reproduce the above copyright
- * notice, this list of conditions and the following disclaimer in
- * the documentation and/or other materials provided with the
- * distribution.
- *
- * 3. The end-user documentation included with the redistribution, if
- * any, must include the following acknowlegement:
- * "This product includes software developed by the
- * Apache Software Foundation (http://www.apache.org/)."
- * Alternately, this acknowlegement may appear in the software itself,
- * if and wherever such third-party acknowlegements normally appear.
- *
- * 4. The names "The Jakarta Project", "Tomcat", and "Apache Software
- * Foundation" must not be used to endorse or promote products derived
- * from this software without prior written permission. For written
- * permission, please contact apache@apache.org.
- *
- * 5. Products derived from this software may not be called "Apache"
- * nor may "Apache" appear in their names without prior written
- * permission of the Apache Group.
- *
- * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
- * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
- * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE
- * DISCLAIMED. IN NO EVENT SHALL THE APACHE SOFTWARE FOUNDATION OR
- * ITS CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
- * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
- * LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF
- * USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND
- * ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
- * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
- * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
- * SUCH DAMAGE.
- * ====================================================================
- *
- * This software consists of voluntary contributions made by many
- * individuals on behalf of the Apache Software Foundation. For more
- * information on the Apache Software Foundation, please see
- * <http://www.apache.org/>.
- *
- */
- package javax.servlet.jsp;
- import javax.servlet.Servlet;
- import javax.servlet.ServletRequest;
- import javax.servlet.ServletResponse;
- import javax.servlet.jsp.PageContext;
- /**
- * <p>
- * 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.
- * </p>
- * <p>
- * 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.
- * </p>
- */
- public abstract class JspFactory {
- private static JspFactory deflt = null;
- /**
- * <p>
- * set the default factory for this implementation. It is illegal for
- * any principal other than the JSP Engine runtime to call this method.
- * </p>
- *
- * @param default The default factory implementation
- */
- public static synchronized void setDefaultFactory(JspFactory deflt) {
- JspFactory.deflt = deflt;
- }
- /**
- * @return the default factory for this implementation
- */
- public static synchronized JspFactory getDefaultFactory() {
- return deflt;
- }
- /**
- * <p>
- * obtains an instance of an implementation dependent
- * javax.servlet.jsp.PageContext abstract class for the calling Servlet
- * and currently pending request and response.
- * </p>
- *
- * <p>
- * This method is typically called early in the processing of the
- * _jspService() mehtod of a JSP implementation class in order to
- * obtain a PageContext object for the request being processed.
- * </p>
- * <p>
- * Invoking this method shall result in the PageContext.initialize()
- * method being invoked. The PageContext returned is properly initialized.
- * </p>
- * <p>
- * All PageContext objects obtained via this method shall be released
- * by invoking releasePageContext().
- * </p>
- *
- * @param servlet the requesting servlet
- * @param config the ServletConfig for 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, PageContext.NO_BUFFER if no buffer,
- * PageContext.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 javax.servlet.jsp.PageContext
- */
- public abstract PageContext getPageContext(Servlet servlet,
- ServletRequest request,
- ServletResponse response,
- String errorPageURL,
- boolean needsSession,
- int buffer,
- boolean autoflush);
- /**
- * <p>
- * 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.
- * </p>
- *
- * @param pc A PageContext previously obtained by getPageContext()
- */
- public abstract void releasePageContext(PageContext pc);
- /**
- * <p>
- * called to get implementation-specific information on the current JSP engine
- * </p>
- *
- * @return a JspEngineInfo object describing the current JSP engine
- */
- public abstract JspEngineInfo getEngineInfo();
- }