jodd.servlet.wrapper.Buffer Maven / Gradle / Ivy
// Copyright (c) 2003-present, Jodd Team (http://jodd.org)
// 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.
//
// THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
// AND ANY EXPRESS 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 COPYRIGHT HOLDER OR 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.
package jodd.servlet.wrapper;
import jodd.io.FastCharArrayWriter;
import jodd.servlet.filter.FastByteArrayServletOutputStream;
import javax.servlet.ServletOutputStream;
import java.io.PrintWriter;
/**
* Facade for both PrintWriter and ServletOutputStream of servlet response.
* Uses fast {@link jodd.io.FastCharArrayWriter char array writter} and
* {@link jodd.servlet.filter.FastByteArrayServletOutputStream byte output stream}.
*/
public class Buffer {
protected FastCharArrayWriter bufferedWriter;
protected FastByteArrayServletOutputStream bufferOutputStream;
protected PrintWriter outWriter;
protected ServletOutputStream outStream;
/**
* Returns a writer.
*/
public PrintWriter getWriter() {
if (outWriter == null) {
if (outStream != null) {
throw new IllegalStateException("Can't call getWriter() after getOutputStream()");
}
bufferedWriter = new FastCharArrayWriter();
outWriter = new PrintWriter(bufferedWriter) {
@Override
public void close() {
// do not close the print writer after rendering
// since it will remove reference to bufferedWriter
}
};
}
return outWriter;
}
/**
* Returns a servlet output stream.
*/
public ServletOutputStream getOutputStream() {
if (outStream == null) {
if (outWriter != null) {
throw new IllegalStateException("Can't call getOutputStream() after getWriter()");
}
bufferOutputStream = new FastByteArrayServletOutputStream();
outStream = bufferOutputStream;
}
return outStream;
}
/**
* Returns true if streams are using.
*/
public boolean isUsingStream() {
return outStream != null;
}
/**
* Returns buffered writer content as char array.
* Returns null if writer is not used.
*/
public char[] toCharArray() {
if (bufferedWriter != null) {
return bufferedWriter.toCharArray();
}
return null;
}
/**
* Returns buffered servlet output content as byte array.
* Returns null if writer is not used.
*/
public byte[] toByteArray() {
if (bufferOutputStream != null) {
return bufferOutputStream.getByteArrayStream().toByteArray();
}
return null;
}
}