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Commons IO example source code file (BOMInputStreamTest.java)

This example Commons IO source code file (BOMInputStreamTest.java) is included in the DevDaily.com "Java Source Code Warehouse" project. The intent of this project is to help you "Learn Java by Example" TM.

Java - Commons IO tags/keywords

a, a, b, b, bominputstream, bominputstream, c, d, exception, exception, expectcloseinputstream, illegalargumentexception, inputstream, io, ioexception

The Commons IO BOMInputStreamTest.java source code

/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 * 
 *      http://www.apache.org/licenses/LICENSE-2.0
 * 
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */
package org.apache.commons.io.input;

import java.io.ByteArrayInputStream;
import java.io.IOException;
import java.io.InputStream;

import junit.framework.TestCase;

import org.apache.commons.io.ByteOrderMark;

/**
 * Test case for {@link BOMInputStream}.
 *
 * @version $Id$
 */
public class BOMInputStreamTest extends TestCase {
    //----------------------------------------------------------------------------
    //  Support code
    //----------------------------------------------------------------------------

    /**
     *  Creates the underlying data stream, with or without BOM.
     */
    public InputStream createDataStream(byte[] baseData, boolean addBOM) {
        byte[] data = baseData;
        if (addBOM) {
            data = new byte[baseData.length + 3];
            data[0] = (byte) 0xEF;
            data[1] = (byte) 0xBB;
            data[2] = (byte) 0xBF;
            System.arraycopy(baseData, 0, data, 3, baseData.length);
        }
        return new ByteArrayInputStream(data);
    }

    private void assertData(byte[] expected, byte[] actual, int off, int len)
        throws Exception {
        assertEquals("length", expected.length, len);
        for (int ii = 0; ii < expected.length; ii++) {
            assertEquals("byte " + ii, expected[ii], actual[ii]);
        }
    }

    /**
     *  A mock InputStream that expects <code>close() to be called.
     */
    private static class ExpectCloseInputStream extends InputStream {
        private boolean _closeCalled;

        @Override
        public void close() throws IOException {
            _closeCalled = true;
        }

        @Override
        public int read() throws IOException {
            return -1;
        }

        public void assertCloseCalled() {
            assertTrue(_closeCalled);
        }
    }

    //----------------------------------------------------------------------------
    //  Test cases
    //----------------------------------------------------------------------------

    // make sure that our support code works as expected
    public void testSupportCode() throws Exception {
        InputStream in = createDataStream(new byte[] { 'A', 'B' }, true);
        byte[] buf = new byte[1024];
        int len = in.read(buf);
        assertEquals(5, len);
        assertEquals(0xEF, buf[0] & 0xFF);
        assertEquals(0xBB, buf[1] & 0xFF);
        assertEquals(0xBF, buf[2] & 0xFF);
        assertEquals('A', buf[3] & 0xFF);
        assertEquals('B', buf[4] & 0xFF);

        assertData(
                new byte[] { (byte) 0xEF, (byte) 0xBB, (byte) 0xBF, 'A', 'B' },
                buf, 0, len);
    }

    public void testReadWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        BOMInputStream in = new BOMInputStream(createDataStream(data, false));
        assertEquals('A', in.read());
        assertEquals('B', in.read());
        assertEquals('C', in.read());
        assertEquals(-1, in.read());
        assertFalse("hasBOM()", in.hasBOM());
        assertFalse("hasBOM(UTF-8)", in.hasBOM(ByteOrderMark.UTF_8));
        assertNull("getBOM", in.getBOM());
    }

    public void testReadEmpty() throws Exception {
        byte[] data = new byte[] {};
        BOMInputStream in = new BOMInputStream(createDataStream(data, false));
        assertEquals(-1, in.read());
        assertFalse("hasBOM()", in.hasBOM());
        assertFalse("hasBOM(UTF-8)", in.hasBOM(ByteOrderMark.UTF_8));
        assertNull("getBOM", in.getBOM());
    }

    public void testReadSmall() throws Exception {
        byte[] data = new byte[] { 'A', 'B' };
        BOMInputStream in = new BOMInputStream(createDataStream(data, false));
        assertEquals('A', in.read());
        assertEquals('B', in.read());
        assertEquals(-1, in.read());
        assertFalse("hasBOM()", in.hasBOM());
        assertFalse("hasBOM(UTF-8)", in.hasBOM(ByteOrderMark.UTF_8));
        assertNull("getBOM", in.getBOM());
    }

    public void testReadWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        BOMInputStream in = new BOMInputStream(createDataStream(data, true));
        assertEquals('A', in.read());
        assertEquals('B', in.read());
        assertEquals('C', in.read());
        assertEquals(-1, in.read());
        assertTrue("hasBOM()", in.hasBOM());
        assertTrue("hasBOM(UTF-8)", in.hasBOM(ByteOrderMark.UTF_8));
        assertEquals("getBOM", ByteOrderMark.UTF_8, in.getBOM());
        try {
            in.hasBOM(ByteOrderMark.UTF_16BE);
        } catch (IllegalArgumentException e) {
            // expected - not configured for UTF-16BE
        }
    }

    public void testGetBOMFirstThenRead() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        BOMInputStream in = new BOMInputStream(createDataStream(data, true));
        assertEquals("getBOM", ByteOrderMark.UTF_8, in.getBOM());
        assertTrue("hasBOM()", in.hasBOM());
        assertTrue("hasBOM(UTF-8)", in.hasBOM(ByteOrderMark.UTF_8));
        assertEquals('A', in.read());
        assertEquals('B', in.read());
        assertEquals('C', in.read());
        assertEquals(-1, in.read());
    }

    public void testReadWithBOMInclude() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        BOMInputStream in = new BOMInputStream(createDataStream(data, true), true);
        assertEquals(0xEF, in.read());
        assertEquals(0xBB, in.read());
        assertEquals(0xBF, in.read());
        assertEquals('A', in.read());
        assertEquals('B', in.read());
        assertEquals('C', in.read());
        assertEquals(-1, in.read());
        assertTrue("hasBOM()", in.hasBOM());
        assertTrue("hasBOM(UTF-8)", in.hasBOM(ByteOrderMark.UTF_8));
        assertEquals("getBOM", ByteOrderMark.UTF_8, in.getBOM());
    }

    public void testGetBOMFirstThenReadInclude() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        BOMInputStream in = new BOMInputStream(createDataStream(data, true), true);
        assertTrue("hasBOM()", in.hasBOM());
        assertTrue("hasBOM(UTF-8)", in.hasBOM(ByteOrderMark.UTF_8));
        assertEquals("getBOM", ByteOrderMark.UTF_8, in.getBOM());
        assertEquals(0xEF, in.read());
        assertEquals(0xBB, in.read());
        assertEquals(0xBF, in.read());
        assertEquals('A', in.read());
        assertEquals('B', in.read());
        assertEquals('C', in.read());
        assertEquals(-1, in.read());
    }

    public void testReadWithMultipleBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        BOMInputStream in = new BOMInputStream(createDataStream(data, true), 
                                            ByteOrderMark.UTF_16BE, ByteOrderMark.UTF_8);
        assertEquals('A', in.read());
        assertEquals('B', in.read());
        assertEquals('C', in.read());
        assertEquals(-1, in.read());
        assertTrue("hasBOM()", in.hasBOM());
        assertTrue("hasBOM(UTF-8)", in.hasBOM(ByteOrderMark.UTF_8));
        assertFalse("hasBOM(UTF-16BE)", in.hasBOM(ByteOrderMark.UTF_16BE));
        assertEquals("getBOM", ByteOrderMark.UTF_8, in.getBOM());
    }

    public void testLargeBufferWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        byte[] buf = new byte[1024];
        assertData(data, buf, 0, in.read(buf));
    }

    public void testLargeBufferWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        InputStream in = new BOMInputStream(createDataStream(data, true));
        byte[] buf = new byte[1024];
        assertData(data, buf, 0, in.read(buf));
    }

    public void testSmallBufferWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        byte[] buf = new byte[1024];
        assertData(new byte[] { 'A', 'B' }, buf, 0, in.read(buf, 0, 2));
        assertData(new byte[] { 'C' }, buf, 0, in.read(buf, 0, 2));
    }

    public void testSmallBufferWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        InputStream in = new BOMInputStream(createDataStream(data, true));
        byte[] buf = new byte[1024];
        assertData(new byte[] { 'A', 'B' }, buf, 0, in.read(buf, 0, 2));
        assertData(new byte[] { 'C' }, buf, 0, in.read(buf, 0, 2));
    }

    public void testLeadingNonBOMSingleRead() throws Exception {
        byte[] data = new byte[] { (byte) 0xEF, (byte) 0xAB, (byte) 0xCD };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        assertEquals(0xEF, in.read());
        assertEquals(0xAB, in.read());
        assertEquals(0xCD, in.read());
        assertEquals(-1, in.read());
    }

    public void testLeadingNonBOMBufferedRead() throws Exception {
        byte[] data = new byte[] { (byte) 0xEF, (byte) 0xAB, (byte) 0xCD };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        byte[] buf = new byte[1024];
        assertData(data, buf, 0, in.read(buf));
    }

    public void testSkipWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        in.skip(2L);
        assertEquals('C', in.read());
    }

    public void testSkipWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, true));
        in.skip(2L);
        assertEquals('C', in.read());
    }

    public void testMarkResetAfterReadWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        assertTrue(in.markSupported());

        in.read();
        in.mark(10);

        in.read();
        in.read();
        in.reset();
        assertEquals('B', in.read());
    }

    public void testMarkResetAfterReadWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, true));
        assertTrue(in.markSupported());

        in.read();
        in.mark(10);

        in.read();
        in.read();
        in.reset();
        assertEquals('B', in.read());
    }

    public void testMarkResetBeforeReadWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        assertTrue(in.markSupported());

        in.mark(10);

        in.read();
        in.read();
        in.reset();
        assertEquals('A', in.read());
    }

    public void testMarkResetBeforeReadWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, true));
        assertTrue(in.markSupported());

        in.mark(10);

        in.read();
        in.read();
        in.reset();
        assertEquals('A', in.read());
    }

    public void testAvailableWithoutBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, false));
        assertEquals(4, in.available());
    }

    public void testAvailableWithBOM() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C', 'D' };
        InputStream in = new BOMInputStream(createDataStream(data, true));
        assertEquals(7, in.available());
    }

    public void testNoBoms() throws Exception {
        byte[] data = new byte[] { 'A', 'B', 'C' };
        try {
            new BOMInputStream(createDataStream(data, true), false, (ByteOrderMark[])null);
            fail("Null BOMs, expected IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // expected
        }
        try {
            new BOMInputStream(createDataStream(data, true), false, new ByteOrderMark[0]);
            fail("Null BOMs, expected IllegalArgumentException");
        } catch (IllegalArgumentException e) {
            // expected
        }
    }

    // this is here for coverage
    public void testClose() throws Exception {
        ExpectCloseInputStream del = new ExpectCloseInputStream();
        InputStream in = new BOMInputStream(del);

        in.close();
        del.assertCloseCalled();
    }
}

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