Examples of java.io.FilterInputStream

java.io.FilterInputStream
A FilterInputStream contains some other input stream, which it uses as its basic source of data, possibly transforming the data along the way or providing additional functionality. The class FilterInputStream itself simply overrides all methods of InputStream with versions that pass all requests to the contained input stream. Subclasses of FilterInputStream may further override some of these methods and may also provide additional methods and fields. @author Jonathan Payne @version 1.33, 04/07/06 @since JDK1.0

                }


                 // return an InputStream wrapper in order to close the ResultSet when the stream is closed
                close = false;
                final ResultSet rs2 = rs;
                return new FilterInputStream(in) {


                    public void close() throws IOException {
                        try {
                            in.close();
                        } finally {

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            /**
             * return an InputStream wrapper in order to
             * close the ResultSet when the stream is closed
             */
            return new FilterInputStream(in) {
                public void close() throws IOException {
                    in.close();
                    // now it's safe to close ResultSet
                    closeResultSet(rs);
                }

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    public void testReadFully() throws IOException {
        final Random r = new Random(1);
        byte[] data = new byte[1000];
        final AtomicInteger readCount = new AtomicInteger();
        r.nextBytes(data);
        FilterInputStream in = new FilterInputStream(new ByteArrayInputStream(data)) {
            public int read(byte[] buffer, int off, int max) throws IOException {
                readCount.incrementAndGet();
                if (r.nextInt(10) == 0) {
                    return 0;
                }
                return in.read(buffer, off, Math.min(10, max));
            }
        };
        in.mark(10000);
        byte[] test = new byte[1000];


        // readFully is not supposed to call read when reading 0 bytes
        assertEquals(0, IOUtils.readFully(in, test, 0, 0));
        assertEquals(0, readCount.get());


        assertEquals(1000, IOUtils.readFully(in, test, 0, 1000));
        IOUtilsTest.assertEquals(data, test);
        test = new byte[1001];
        in.reset();
        in.mark(10000);
        assertEquals(1000, IOUtils.readFully(in, test, 0, 1001));
        assertEquals(0, IOUtils.readFully(in, test, 0, 0));
    }

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    public void testSkipFully() throws IOException {
        final Random r = new Random(1);
        byte[] data = new byte[1000];
        r.nextBytes(data);
        FilterInputStream in = new FilterInputStream(new ByteArrayInputStream(data)) {
            public int read(byte[] buffer, int off, int max) throws IOException {
                return in.read(buffer, off, Math.min(10, max));
            }
        };
        in.mark(10000);
        IOUtils.skipFully(in, 1000);
        assertEquals(-1, in.read());
        in.reset();
        try {
            IOUtils.skipFully(in, 1001);
            fail();
        } catch (EOFException e) {
            // expected

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        dieOnCircularReference();


        final ClassLoaderWithFlag classLoader = getClassLoader();
        return !classLoader.needsCleanup()
            ? openInputStream(classLoader.getLoader())
            : new FilterInputStream(openInputStream(classLoader.getLoader())) {
                    public void close() throws IOException {
                        FileUtils.close(in);
                        classLoader.cleanup();
                    }
                    protected void finalize() throws Throwable {

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        if (ze == null) {
            z.close();
            throw new BuildException("no entry " + getName() + " in "
                                     + getArchive());
        }
        return new FilterInputStream(z.getInputStream(ze)) {
            public void close() throws IOException {
                FileUtils.close(in);
                z.close();
            }
            protected void finalize() throws Throwable {

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            // needed
            InputStream responseStream = (getHttpResponse() == null) ? null
                    : (getHttpResponse().getEntity() == null) ? null
                            : getHttpResponse().getEntity().getContent();
            if (responseStream != null) {
                result = new FilterInputStream(responseStream) {
                    @Override
                    public void close() throws IOException {
                        super.close();
                        getHttpResponse().getEntity().consumeContent();
                    }

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            wire(header, is);
         } finally {
            is.close();
         }
         // we must call FileBackedOutputStream.reset to remove temporary file
         return new FilterInputStream(out.asByteSource().getInput()) {
            @Override
            public void close() throws IOException {
               super.close();
               out.reset();
            }

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                /**
                 * return an InputStream wrapper in order to
                 * close the ResultSet when the stream is closed
                 */
                return new FilterInputStream(in) {
                    public void close() throws IOException {
                        in.close();
                        // now it's safe to close ResultSet
                        closeResultSet(rs);
                    }

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                }


                 // return an InputStream wrapper in order to close the ResultSet when the stream is closed
                close = false;
                final ResultSet rs2 = rs;
                return new FilterInputStream(in) {


                    public void close() throws IOException {
                        try {
                            in.close();
                        } finally {

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