/**
* 弹出最近的buffer，如果堆栈中只有一个buffer，则弹出后再创建一个新的。
*
* @return 最近的buffer内容，如果<code>getOutputStream</code>方法从未被调用，则返回空的byte array
* @throws IllegalStateException 如果不在buffer模式，或<code>getWriter</code>方法曾被调用
*/
public ByteArray popByteBuffer() {
if (!buffering) {
throw new IllegalStateException("Buffering mode is required to popByteBuffer");
}
if (writer != null) {
throw new IllegalStateException(
"Unable to popByteBuffer() since the getWriter() method has been called");
}
if (stream == null) {
return new ByteArray(EMPTY_BYTE_ARRAY, 0, 0);
} else {
flushBufferAdapter();
ByteArrayOutputStream block = bytesStack.pop();
if (bytesStack.size() == 0) {
bytesStack.push(new ByteArrayOutputStream());
}
((BufferedServletOutputStream) stream).updateOutputStream(bytesStack.peek());
logger.logMessage(
LogLevel.DEBUG, "Popped the last byte buffer (stack size is " + bytesStack.size() + ")");
return block.toByteArray();
}
}
public void flush() throws IOException {
ByteArray bytes = buffer.toByteArray();
if (bytes.getLength() > 0) {
ByteArrayInputStream inputBytes =
new ByteArrayInputStream(bytes.getRawBytes(), bytes.getOffset(), bytes.getLength());
InputStreamReader reader = new InputStreamReader(inputBytes, charset);
StreamUtil.io(reader, writer, true, false);
writer.flush();
buffer.reset();
}
}
/**
* 返回最上层的ByteArray
*
* @return 最近的buffer内容，如果<code>getOutputStream</code>方法从未被调用，则返回空的byte array
* @throws IllegalStateException 如果不在buffer模式，或<code>getWriter</code>方法曾被调用
*/
public ByteArray peekByteBuffer() {
if (!buffering) {
throw new IllegalStateException("Buffering mode is required to popByteBuffer");
}
if (writer != null) {
throw new IllegalStateException(
"Unable to popByteBuffer() since the getWriter() method has been called");
}
if (stream == null) {
return new ByteArray(EMPTY_BYTE_ARRAY, 0, 0);
} else {
flushBufferAdapter();
ByteArrayOutputStream block = bytesStack.peek();
return block.toByteArray();
}
}
public void write(byte[] b, int off, int len) throws IOException {
buffer.write(b, off, len);
}
public void write(byte[] b) throws IOException {
buffer.write(b, 0, b.length);
}
public void write(int b) throws IOException {
buffer.write((byte) b);
}
public void close() throws IOException {
bytes.flush();
bytes.close();
}
public void flush() throws IOException {
bytes.flush();
}