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JSP2.1 Jasper implementation from Glassfish
/*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS HEADER.
*
* Copyright 1997-2008 Sun Microsystems, Inc. All rights reserved.
*
* The contents of this file are subject to the terms of either the GNU
* General Public License Version 2 only ("GPL") or the Common Development
* and Distribution License("CDDL") (collectively, the "License"). You
* may not use this file except in compliance with the License. You can obtain
* a copy of the License at https://glassfish.dev.java.net/public/CDDL+GPL.html
* or glassfish/bootstrap/legal/LICENSE.txt. See the License for the specific
* language governing permissions and limitations under the License.
*
* When distributing the software, include this License Header Notice in each
* file and include the License file at glassfish/bootstrap/legal/LICENSE.txt.
* Sun designates this particular file as subject to the "Classpath" exception
* as provided by Sun in the GPL Version 2 section of the License file that
* accompanied this code. If applicable, add the following below the License
* Header, with the fields enclosed by brackets [] replaced by your own
* identifying information: "Portions Copyrighted [year]
* [name of copyright owner]"
*
* Contributor(s):
*
* If you wish your version of this file to be governed by only the CDDL or
* only the GPL Version 2, indicate your decision by adding "[Contributor]
* elects to include this software in this distribution under the [CDDL or GPL
* Version 2] license." If you don't indicate a single choice of license, a
* recipient has the option to distribute your version of this file under
* either the CDDL, the GPL Version 2 or to extend the choice of license to
* its licensees as provided above. However, if you add GPL Version 2 code
* and therefore, elected the GPL Version 2 license, then the option applies
* only if the new code is made subject to such option by the copyright
* holder.
*
*
* This file incorporates work covered by the following copyright and
* permission notice:
*
* Copyright 2004 The Apache Software Foundation
*
* 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 org.apache.jasper.runtime;
import java.lang.IllegalStateException;
import java.io.Writer;
import java.io.PrintWriter;
import java.io.IOException;
import javax.servlet.*;
import javax.servlet.http.*;
import javax.servlet.jsp.JspWriter;
import com.sun.enterprise.web.io.ByteWriter;
/**
* ServletResponseWrapper used by the JSP 'include' action.
*
* This wrapper response object is passed to RequestDispatcher.include(), so
* that the output of the included resource is appended to that of the
* including page.
*
* @author Pierre Delisle
*/
public class ServletResponseWrapperInclude extends HttpServletResponseWrapper {
/**
* PrintWriter which appends to the JspWriter of the including page.
*/
private PrintWriter printWriter;
private JspWriter jspWriter;
// START CR 6466049
/**
* Indicates whether or not the wrapped JspWriter can be flushed.
*/
private boolean canFlushWriter;
// END CR 6466049
public ServletResponseWrapperInclude(ServletResponse response,
JspWriter jspWriter) {
super((HttpServletResponse)response);
this.jspWriter = jspWriter;
if (jspWriter instanceof JspWriterImpl &&
((JspWriterImpl)jspWriter).shouldOutputBytes()) {
this.printWriter = new PrintWriterWrapper((JspWriterImpl)jspWriter);
} else {
this.printWriter = new PrintWriter(jspWriter);
}
// START CR 6466049
this.canFlushWriter = (jspWriter instanceof JspWriterImpl);
// END CR 6466049
}
/**
* Returns a wrapper around the JspWriter of the including page.
*/
public PrintWriter getWriter() throws IOException {
return printWriter;
}
public ServletOutputStream getOutputStream() throws IOException {
throw new IllegalStateException();
}
/**
* Clears the output buffer of the JspWriter associated with the including
* page.
*/
public void resetBuffer() {
try {
jspWriter.clearBuffer();
} catch (IOException ioe) {
}
}
// START CR 6421712
/**
* Flush the wrapper around the JspWriter of the including page.
*/
public void flushBuffer() throws IOException {
printWriter.flush();
}
// END CR 6421712
// START CR 6466049
/**
* Indicates whether or not the wrapped JspWriter can be flushed.
* (BodyContent objects cannot be flushed)
*/
public boolean canFlush() {
return canFlushWriter;
}
// END CR 6466049
// START PWC 6512276
/**
* Are there any data to be flushed ?
*/
public boolean hasData() {
if (!canFlushWriter || ((JspWriterImpl)jspWriter).hasData()) {
return true;
}
return false;
}
// END PWC 6512276
static private class PrintWriterWrapper
extends PrintWriter implements ByteWriter {
private JspWriterImpl jspWriter;
PrintWriterWrapper(JspWriterImpl jspWriter) {
super(jspWriter);
this.jspWriter = jspWriter;
}
public void write(byte[] buff, int off, int len, int strlen)
throws IOException {
jspWriter.write(buff, off, len, strlen);
}
}
}