[Jetty-support] Why does a readonly View allow poke?

[David S. <sa...@mi...>]

Hello, all.

I'm trying to understand the Buffer classes and how they work.  Why
does a readonly View on a Buffer allows poking?  Here's a test I'd
expect to either pass, or fail when poke() is called:

	@Test
	public void compactView() {
		ByteArrayBuffer buffer = new ByteArrayBuffer("abc".getBytes(), 0, 3,
				Buffer.READWRITE);
		doEvilThings(buffer.asReadOnlyBuffer());
		assertEquals("abc", buffer.toString());
	}

	private void doEvilThings(Buffer immutable) {
		immutable.poke(2, new ByteArrayBuffer("d"));
	}

Instead, it fails on the assertion:

org.junit.ComparisonFailure: expected:<ab[c]> but was:<ab[d]>
	at org.junit.Assert.assertEquals(Assert.java:99)
	at org.junit.Assert.assertEquals(Assert.java:117)
	at net.saff.jetty.theories.BufferTheories.compactView(BufferTheories.java:90)

Is this intentional, because I'm misunderstanding what "readonly"
means?  Thanks,

   David Saff