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Commons IO example source code file (CopyUtilsTest.java)

This example Commons IO source code file (CopyUtilsTest.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

bytearrayinputstream, bytearrayoutputstream, bytearrayoutputstream, content, content, exception, exception, io, outputstream, sizes, string, string, stringwriter, us-ascii, util, yellonflushandcloseoutputstream

The Commons IO CopyUtilsTest.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;

import java.io.ByteArrayInputStream;
import java.io.InputStream;
import java.io.OutputStream;
import java.io.Reader;
import java.io.StringWriter;
import java.io.Writer;
import java.util.Arrays;

import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.commons.io.testtools.FileBasedTestCase;
import org.apache.commons.io.testtools.YellOnCloseInputStream;
import org.apache.commons.io.testtools.YellOnFlushAndCloseOutputStream;

@SuppressWarnings("deprecation") // these are test cases for the deprecated CopyUtils

/**
 * JUnit tests for CopyUtils.
 * 
 * @author Jeff Turner
 * @author Matthew Hawthorne
 * @author <a href="mailto:jeremias@apache.org">Jeremias Maerki
 * @version $Id: CopyUtilsTest.java 1021986 2010-10-13 03:37:23Z ggregory $
 * @see CopyUtils
 */
public class CopyUtilsTest extends FileBasedTestCase {

    /*
     * NOTE this is not particularly beautiful code. A better way to check for
     * flush and close status would be to implement "trojan horse" wrapper
     * implementations of the various stream classes, which set a flag when
     * relevant methods are called. (JT)
     */

    private static final int FILE_SIZE = 1024 * 4 + 1;


    private byte[] inData = generateTestData(FILE_SIZE);

    public CopyUtilsTest(String testName) {
        super(testName);
    }

    // ----------------------------------------------------------------
    // Setup
    // ----------------------------------------------------------------

    @Override
    public void setUp() throws Exception {
    }

    @Override
    public void tearDown() throws Exception {
    }

    // ----------------------------------------------------------------
    // Tests
    // ----------------------------------------------------------------

    public void testCtor() {
        new CopyUtils();
        // Nothing to assert, the constructor is public and does not blow up.
    }
    
    public void testCopy_byteArrayToOutputStream() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        CopyUtils.copy(inData, out);

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testCopy_byteArrayToWriter() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        Writer writer = new java.io.OutputStreamWriter(out, "US-ASCII");
        
        CopyUtils.copy(inData, writer);
        writer.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testCopy_byteArrayToWriterWithEncoding() throws Exception {
        String inDataStr = "data";
        String charsetName = "UTF-8";
        StringWriter writer = new StringWriter(); 
        CopyUtils.copy(inDataStr.getBytes(charsetName), writer, charsetName);
        assertEquals(inDataStr, writer.toString());
    }

    public void testCopy_inputStreamToOutputStream() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);

        int count = CopyUtils.copy(in, out);
        
        assertEquals("Not all bytes were read", 0, in.available());
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
        assertEquals(inData.length, count);
    }

    public void testCopy_inputStreamToWriter() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        Writer writer = new java.io.OutputStreamWriter(out, "US-ASCII");
        
        CopyUtils.copy(in, writer);
        writer.flush();

        assertEquals("Not all bytes were read", 0, in.available());
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testCopy_inputStreamToWriterWithEncoding() throws Exception {
        String inDataStr = "data";
        String charsetName = "UTF-8";
        StringWriter writer = new StringWriter();
        CopyUtils.copy(new ByteArrayInputStream(inDataStr.getBytes(charsetName)), writer, charsetName);
        assertEquals(inDataStr, writer.toString());
    }

    public void testCopy_readerToOutputStream() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new java.io.InputStreamReader(in, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        CopyUtils.copy(reader, out);
        //Note: this method *does* flush. It is equivalent to:
        //  OutputStreamWriter _out = new OutputStreamWriter(fout);
        //  IOUtils.copy( fin, _out, 4096 ); // copy( Reader, Writer, int );
        //  _out.flush();
        //  out = fout;

        // Note: rely on the method to flush
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testCopy_readerToWriter() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new java.io.InputStreamReader(in, "US-ASCII");

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        Writer writer = new java.io.OutputStreamWriter(out, "US-ASCII");

        int count = CopyUtils.copy(reader, writer);
        writer.flush();
        assertEquals(
            "The number of characters returned by copy is wrong",
            inData.length,
            count);
        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testCopy_stringToOutputStream() throws Exception {
        String str = new String(inData, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);

        CopyUtils.copy(str, out);
        //Note: this method *does* flush. It is equivalent to:
        //  OutputStreamWriter _out = new OutputStreamWriter(fout);
        //  IOUtils.copy( str, _out, 4096 ); // copy( Reader, Writer, int );
        //  _out.flush();
        //  out = fout;
        // note: we don't flush here; this IOUtils method does it for us

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

    public void testCopy_stringToWriter() throws Exception {
        String str = new String(inData, "US-ASCII");

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        Writer writer = new java.io.OutputStreamWriter(out, "US-ASCII");

        CopyUtils.copy(str, writer);
        writer.flush();

        assertEquals("Sizes differ", inData.length, baout.size());
        assertTrue("Content differs", Arrays.equals(inData, baout.toByteArray()));
    }

} // CopyUtilsTest

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Here is a short list of links related to this Commons IO CopyUtilsTest.java source code file:



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