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package com.sun.faces.facelets;

import com.sun.faces.facelets.util.FastWriter;

import java.io.IOException;
import java.io.Writer;

/**
 * A class for handling state insertion.  Content is written
 * directly to "out" until an attempt to write state;  at that
 * point, it's redirected into a buffer that can be picked through
 * in theory, this buffer should be very small, since it only
 * needs to be enough to contain all the content after the close
 * of the first (and, hopefully, only) form.
 * 

* Potential optimizations: *

    *
  • If we created a new FastWriter at each call to writingState(), * and stored a List of them, then we'd know that state tokens could * only possibly be near the start of each buffer (and might not be there * at all). (There might be a close-element before the state token). Then, * we'd only need to check the start of the buffer for the state token; * if it's there, write out the real state, then blast the rest of the * buffer out. This wouldn't even require toString(), which for * large buffers is expensive. However, this optimization is only * going to be especially meaningful for the multi-form case. *
  • *
  • More of a FastWriter optimization than a StateWriter, but: * it is far faster to create a set of small 1K buffers than constantly * reallocating one big buffer.
  • *
* * @author Adam Winer */ final class StateWriter extends Writer { private int initialSize; private Writer out; private FastWriter fast; private boolean writtenState; static public StateWriter getCurrentInstance() { return (StateWriter) CURRENT_WRITER.get(); } public StateWriter(Writer initialOut, int initialSize) { if (initialSize < 0) { throw new IllegalArgumentException("Initial Size cannot be less than 0"); } this.initialSize = initialSize; this.out = initialOut; CURRENT_WRITER.set(this); } /** * Mark that state is about to be written. Contrary to what you'd expect, * we cannot and should not assume that this location is really going * to have state; it is perfectly legit to have a ResponseWriter that * filters out content, and ignores an attempt to write out state * at this point. So, we have to check after the fact to see * if there really are state markers. */ public void writingState() { if (!this.writtenState) { this.writtenState = true; this.out = this.fast = new FastWriter(this.initialSize); } } public boolean isStateWritten() { return this.writtenState; } public void close() throws IOException { // do nothing } public void flush() throws IOException { // do nothing } public void write(char[] cbuf, int off, int len) throws IOException { this.out.write(cbuf, off, len); } public void write(char[] cbuf) throws IOException { this.out.write(cbuf); } public void write(int c) throws IOException { this.out.write(c); } public void write(String str, int off, int len) throws IOException { this.out.write(str, off, len); } public void write(String str) throws IOException { this.out.write(str); } public String getAndResetBuffer() { if (!this.writtenState) { throw new IllegalStateException( "Did not write state; no buffer is available"); } String result = this.fast.toString(); this.fast.reset(); return result; } public void release() { CURRENT_WRITER.set(null); } static private final ThreadLocal CURRENT_WRITER = new ThreadLocal(); }




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