// Copyright (c) 2003-2014, Jodd Team (jodd.org). All Rights Reserved.
package jodd.servlet.wrapper;
import jodd.io.FastCharArrayWriter;
import jodd.servlet.filter.FastByteArrayServletOutputStream;
import javax.servlet.ServletOutputStream;
import java.io.PrintWriter;
/**
* Facade for both <code>PrintWriter</code> and <code>ServletOutputStream</code> 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 <code>true</code> if streams are using.
*/
public boolean isUsingStream() {
return outStream != null;
}
/**
* Returns buffered writer content as char array.
* Returns <code>null</code> 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 <code>null</code> if writer is not used.
*/
public byte[] toByteArray() {
if (bufferOutputStream != null) {
return bufferOutputStream.getByteArrayStream().toByteArray();
}
return null;
}
}