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From "Richard Liang (JIRA)" <j...@apache.org>
Subject [jira] Created: (HARMONY-124) java.nio.charset.CharsetDecoder doesn't throw CoderMalfunctionError exception when decodeLoop threw unexpected exception.
Date Fri, 24 Feb 2006 06:58:41 GMT
java.nio.charset.CharsetDecoder doesn't throw CoderMalfunctionError exception when decodeLoop
threw unexpected exception.
-------------------------------------------------------------------------------------------------------------------------

         Key: HARMONY-124
         URL: http://issues.apache.org/jira/browse/HARMONY-124
     Project: Harmony
        Type: Bug
  Components: Classlib  
    Reporter: Richard Liang


public final CoderResult decode(ByteBuffer in, CharBuffer out, boolean endOfInput)
As spec says, the method throws CoderMalfunctionError if an invocation of the decodeLoop method
threw an unexpected exception.

However, Harmony doesn't throws CoderMalfunctionError when decodeLoop method threw an unexpected
exception. 

The following test cases pass on RI , but fail on Harmony.

	/*
	 * Test malfunction decode(ByteBuffer) 
	 */
	public void testDecode_CoderMalfunctionError() throws Exception {
		MockMalfunctionCharset cs = new MockMalfunctionCharset("mock", null);
		try{
			cs.newDecoder().onMalformedInput(CodingErrorAction.REPLACE)
		       .onUnmappableCharacter(CodingErrorAction.REPLACE).decode(ByteBuffer.wrap(new byte[]{0x00,0x11}));
			fail("should throw CoderMalfunctionError");//NON-NLS-1$
		}catch(CoderMalfunctionError e){
			//expected
		}
	}

	/*
	 * Test malfunction decode(ByteBuffer) 
	 */
	public void testDecode_NoCoderMalfunctionError() throws Exception {
		MockMalfunctionCharset cs = new MockMalfunctionCharset("mock", null);
		try{
			cs.decode(ByteBuffer.wrap(new byte[]{0x00,0x11}));
		}catch(CoderMalfunctionError e){
			fail("Charset.decode should return silently");//NON-NLS-1
		}
	}
	/*
	 * Mock charset class with malfunction decode & encode.
	 */
	static final class MockMalfunctionCharset extends Charset {

		public MockMalfunctionCharset(String canonicalName, String[] aliases) {
			super(canonicalName, aliases);
		}

		public boolean contains(Charset cs) {
			return false;
		}

		public CharsetDecoder newDecoder() {
			return new MockMalfunctionDecoder(this);
		}

		public CharsetEncoder newEncoder() {
			return new MockMalfunctionEncoder(this);
		}
	}
	/*
	 * Mock decoder. decodeLoop always throws unexpected exception.
	 */
	static class MockMalfunctionDecoder extends java.nio.charset.CharsetDecoder {

		public MockMalfunctionDecoder(Charset cs) {
			super(cs, 1, 10);
		}

		protected CoderResult decodeLoop(ByteBuffer in, CharBuffer out) {
			throw new BufferOverflowException();
		}
	}
	/*
	 * Mock encoder. encodeLoop always throws unexpected exception.
	 */
	static class MockMalfunctionEncoder extends java.nio.charset.CharsetEncoder {

		public MockMalfunctionEncoder(Charset cs) {
			super(cs, 1, 3, new byte[] { (byte) '?' });
		}

		protected CoderResult encodeLoop(CharBuffer in, ByteBuffer out) {
			throw new BufferOverflowException();
		}
	}


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