Commons IO example source code file (TaggedOutputStreamTest.java)

This example Commons IO source code file (TaggedOutputStreamTest.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

bytearrayoutputstream, closedoutputstream, expected, expected, io, ioexception, ioexception, outputstream, taggedioexception, taggedoutputstream, taggedoutputstream, taggedoutputstreamtest, testcase, unexpected, unexpected, util

The Commons IO TaggedOutputStreamTest.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.output;

import java.io.IOException;
import java.io.OutputStream;
import java.util.UUID;

import junit.framework.TestCase;

import org.apache.commons.io.TaggedIOException;

/**
 * JUnit Test Case for {@link TaggedOutputStream}.
 */
public class TaggedOutputStreamTest extends TestCase {

    public void testNormalStream() {
        try {
            ByteArrayOutputStream buffer = new ByteArrayOutputStream(); 
            OutputStream stream = new TaggedOutputStream(buffer);
            stream.write('a');
            stream.write(new byte[] { 'b' });
            stream.write(new byte[] { 'c' }, 0, 1);
            stream.flush();
            stream.close();
            assertEquals(3, buffer.size());
            assertEquals('a', buffer.toByteArray()[0]);
            assertEquals('b', buffer.toByteArray()[1]);
            assertEquals('c', buffer.toByteArray()[2]);
        } catch (IOException e) {
            fail("Unexpected exception thrown");
        }
    }

    public void testBrokenStream() {
        IOException exception = new IOException("test exception");
        TaggedOutputStream stream =
            new TaggedOutputStream(new BrokenOutputStream(exception));

        // Test the write() method
        try {
            stream.write('x');
            fail("Expected exception not thrown.");
        } catch (IOException e) {
            assertTrue(stream.isCauseOf(e));
            try {
                stream.throwIfCauseOf(e);
                fail("Expected exception not thrown.");
            } catch (IOException e2) {
                assertEquals(exception, e2);
            }
        }

        // Test the flush() method
        try {
            stream.flush();
            fail("Expected exception not thrown.");
        } catch (IOException e) {
            assertTrue(stream.isCauseOf(e));
            try {
                stream.throwIfCauseOf(e);
                fail("Expected exception not thrown.");
            } catch (IOException e2) {
                assertEquals(exception, e2);
            }
        }

        // Test the close() method
        try {
            stream.close();
            fail("Expected exception not thrown.");
        } catch (IOException e) {
            assertTrue(stream.isCauseOf(e));
            try {
                stream.throwIfCauseOf(e);
                fail("Expected exception not thrown.");
            } catch (IOException e2) {
                assertEquals(exception, e2);
            }
        }
    }

    public void testOtherException() {
        IOException exception = new IOException("test exception");
        OutputStream closed = new ClosedOutputStream();
        TaggedOutputStream stream = new TaggedOutputStream(closed);

        assertFalse(stream.isCauseOf(exception));
        assertFalse(stream.isCauseOf(
                new TaggedIOException(exception, UUID.randomUUID())));

        try {
            stream.throwIfCauseOf(exception);
        } catch (IOException e) {
            fail("Unexpected exception thrown");
        }

        try {
            stream.throwIfCauseOf(
                    new TaggedIOException(exception, UUID.randomUUID()));
        } catch (IOException e) {
            fail("Unexpected exception thrown");
        }
    }

}