Examples of org.apache.http.impl.io.ContentLengthInputStream

org.apache.http.impl.io.ContentLengthInputStream
Stream that cuts off after a specified number of bytes. Note that this class NEVER closes the underlying stream, even when close gets called. Instead, it will read until the "end" of its chunking on close, which allows for the seamless execution of subsequent HTTP 1.1 requests, while not requiring the client to remember to read the entire contents of the response.
Implementation note: Choices abound. One approach would pass through the {@link InputStream#mark} and {@link InputStream#reset} calls tothe underlying stream. That's tricky, though, because you then have to start duplicating the work of keeping track of how much a reset rewinds. Further, you have to watch out for the "readLimit", and since the semantics for the readLimit leave room for differing implementations, you might get into a lot of trouble.

Alternatively, you could make this class extend {@link java.io.BufferedInputStream}and then use the protected members of that class to avoid duplicated effort. That solution has the side effect of adding yet another possible layer of buffering.

Then, there is the simple choice, which this takes - simply don't support {@link InputStream#mark} and {@link InputStream#reset}. That choice has the added benefit of keeping this class very simple.
@author Ortwin Glueck @author Eric Johnson @author Mike Bowler @since 4.0

        }
    }


    public void testBasics() throws IOException {
        String correct = "1234567890123456";
        InputStream in = new ContentLengthInputStream(new SessionInputBufferMockup(
            EncodingUtils.getBytes(correct, CONTENT_CHARSET)), 10L);
        ByteArrayOutputStream out = new ByteArrayOutputStream();


        byte[] buffer = new byte[50];
        int len = in.read(buffer, 0, 2);
        out.write(buffer, 0, len);
        len = in.read(buffer);
        out.write(buffer, 0, len);
        
        String result = EncodingUtils.getString(out.toByteArray(), CONTENT_CHARSET);
        assertEquals(result, "1234567890");
    }

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        String result = EncodingUtils.getString(out.toByteArray(), CONTENT_CHARSET);
        assertEquals(result, "1234567890");
    }


    public void testSkip() throws IOException {
        InputStream in = new ContentLengthInputStream(new SessionInputBufferMockup(new byte[20]), 10L);
        assertEquals(10, in.skip(10));
        assertTrue(in.read() == -1);


        in = new ContentLengthInputStream(new SessionInputBufferMockup(new byte[20]), 10L);
        in.read();
        assertEquals(9, in.skip(10));
        assertTrue(in.read() == -1);


        in = new ContentLengthInputStream(new SessionInputBufferMockup(new byte[20]), 2L);
        in.read();
        in.read();
        assertTrue(in.skip(10) <= 0);
        assertTrue(in.skip(-1) == 0);
        assertTrue(in.read() == -1);
        
        in = new ContentLengthInputStream(new SessionInputBufferMockup(new byte[2]), 4L);
        in.read();
        assertTrue(in.skip(2) == 1);


        in = new ContentLengthInputStream(new SessionInputBufferMockup(new byte[20]), 10L);
        in.skip(5);
        assertEquals(5, in.read(new byte[20]));
    }

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        assertEquals(5, in.read(new byte[20]));
    }


    public void testClose() throws IOException {
        String correct = "1234567890123456";
        InputStream in = new ContentLengthInputStream(new SessionInputBufferMockup(
            EncodingUtils.getBytes(correct, CONTENT_CHARSET)), 10L);
        in.close();
        in.close();
        try {
            in.read();
            fail("IOException should have been thrown");
        } catch (IOException ex) {
            // expected
        }
        byte[] tmp = new byte[10]; 
        try {
            in.read(tmp);
            fail("IOException should have been thrown");
        } catch (IOException ex) {
            // expected
        }
        try {
            in.read(tmp, 0, tmp.length);
            fail("IOException should have been thrown");
        } catch (IOException ex) {
            // expected
        }
    }

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            if (len == ContentLengthStrategy.CHUNKED) {
                this.in = new ChunkedInputStream(this.inbuffer);
            } else if (len == ContentLengthStrategy.IDENTITY) {
                this.in = new IdentityInputStream(this.inbuffer);                            
            } else {
                this.in = new ContentLengthInputStream(inbuffer, len);
            }
        }
        return request;
    }

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            entity.setContentLength(-1);
            entity.setContent(new IdentityInputStream(inbuffer));                            
        } else {
            entity.setChunked(false);
            entity.setContentLength(len);
            entity.setContent(new ContentLengthInputStream(inbuffer, len));
        }
        
        Header contentTypeHeader = message.getFirstHeader(HTTP.CONTENT_TYPE);
        if (contentTypeHeader != null) {
            entity.setContentType(contentTypeHeader);

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            entity.setContentLength(-1);
            entity.setContent(new IdentityInputStream(inbuffer));
        } else {
            entity.setChunked(false);
            entity.setContentLength(len);
            entity.setContent(new ContentLengthInputStream(inbuffer, len));
        }


        Header contentTypeHeader = message.getFirstHeader(HTTP.CONTENT_TYPE);
        if (contentTypeHeader != null) {
            entity.setContentType(contentTypeHeader);

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            entity.setContentLength(-1);
            entity.setContent(new IdentityInputStream(inbuffer));
        } else {
            entity.setChunked(false);
            entity.setContentLength(len);
            entity.setContent(new ContentLengthInputStream(inbuffer, len));
        }


        Header contentTypeHeader = message.getFirstHeader(HTTP.CONTENT_TYPE);
        if (contentTypeHeader != null) {
            entity.setContentType(contentTypeHeader);

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        if (len == ContentLengthStrategy.CHUNKED) {
            return new ChunkedInputStream(inbuffer);
        } else if (len == ContentLengthStrategy.IDENTITY) {
            return new IdentityInputStream(inbuffer);
        } else {
            return new ContentLengthInputStream(inbuffer, len);
        }
    }

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            entity.setContentLength(-1);
            entity.setContent(new IdentityInputStream(inbuffer));
        } else {
            entity.setChunked(false);
            entity.setContentLength(len);
            entity.setContent(new ContentLengthInputStream(inbuffer, len));
        }


        Header contentTypeHeader = message.getFirstHeader(HTTP.CONTENT_TYPE);
        if (contentTypeHeader != null) {
            entity.setContentType(contentTypeHeader);

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        if (len == ContentLengthStrategy.CHUNKED) {
            return new ChunkedInputStream(inbuffer);
        } else if (len == ContentLengthStrategy.IDENTITY) {
            return new IdentityInputStream(inbuffer);
        } else {
            return new ContentLengthInputStream(inbuffer, len);
        }
    }

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