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Commons IO example source code file (IOUtilsCopyTestCase.java)

This example Commons IO source code file (IOUtilsCopyTestCase.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, exception, exception, inputstream, io, nullpointerexception, outputstream, us-ascii, us-ascii, util, writer, yelloncloseinputstream, yellonflushandcloseoutputstream, yellonflushandcloseoutputstream

The Commons IO IOUtilsCopyTestCase.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.InputStreamReader;
import java.io.OutputStream;
import java.io.OutputStreamWriter;
import java.io.Reader;
import java.io.Writer;
import java.util.Arrays;

import org.apache.commons.io.input.NullInputStream;
import org.apache.commons.io.input.NullReader;
import org.apache.commons.io.output.ByteArrayOutputStream;
import org.apache.commons.io.output.NullOutputStream;
import org.apache.commons.io.output.NullWriter;
import org.apache.commons.io.testtools.FileBasedTestCase;
import org.apache.commons.io.testtools.YellOnCloseInputStream;
import org.apache.commons.io.testtools.YellOnFlushAndCloseOutputStream;

/**
 * JUnit tests for IOUtils copy methods.
 * 
 * @author Jeff Turner
 * @author Matthew Hawthorne
 * @author Jeremias Maerki
 * @author Stephen Colebourne
 * @version $Id: IOUtilsCopyTestCase.java 982450 2010-08-05 01:09:46Z niallp $
 * @see IOUtils
 */
public class IOUtilsCopyTestCase 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 IOUtilsCopyTestCase(String testName) {
        super(testName);
    }

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

    @Override
    public void setUp() throws Exception {
    }

    @Override
    public void tearDown() throws Exception {
    }

    //-----------------------------------------------------------------------
    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 = IOUtils.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_inputStreamToOutputStream_nullIn() throws Exception {
        OutputStream out = new ByteArrayOutputStream();
        try {
            IOUtils.copy((InputStream) null, out);
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testCopy_inputStreamToOutputStream_nullOut() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        try {
            IOUtils.copy(in, (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    /**
     * Test Copying file > 2GB  - see issue# IO-84
     */
    public void testCopy_inputStreamToOutputStream_IO84() throws Exception {
        long size = (long)Integer.MAX_VALUE + (long)1;
        InputStream  in  = new NullInputStream(size);
        OutputStream out = new NullOutputStream();

        // Test copy() method
        assertEquals(-1, IOUtils.copy(in, out));

        // reset the input
        in.close();

        // Test copyLarge() method
        assertEquals("copyLarge()", size, IOUtils.copyLarge(in, out));
    }

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

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.copy(in, writer);
        out.off();
        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_inputStreamToWriter_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(out, "US-ASCII");
        try {
            IOUtils.copy((InputStream) null, writer);
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testCopy_inputStreamToWriter_nullOut() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        try {
            IOUtils.copy(in, (Writer) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testCopy_inputStreamToWriter_Encoding() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.copy(in, writer, "UTF8");
        out.off();
        writer.flush();

        assertEquals("Not all bytes were read", 0, in.available());
        byte[] bytes = baout.toByteArray();
        bytes = new String(bytes, "UTF8").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }

    public void testCopy_inputStreamToWriter_Encoding_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(out, "US-ASCII");
        try {
            IOUtils.copy((InputStream) null, writer, "UTF8");
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testCopy_inputStreamToWriter_Encoding_nullOut() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        try {
            IOUtils.copy(in, (Writer) null, "UTF8");
            fail();
        } catch (NullPointerException ex) {}
    }

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

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");
        
        IOUtils.copy(in, writer, null);
        out.off();
        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_readerToOutputStream() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);
        
        IOUtils.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_readerToOutputStream_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        try {
            IOUtils.copy((Reader) null, out);
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testCopy_readerToOutputStream_nullOut() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        try {
            IOUtils.copy(reader, (OutputStream) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    //-----------------------------------------------------------------------
    public void testCopy_readerToOutputStream_Encoding() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);

        IOUtils.copy(reader, out, "UTF16");
        // note: this method *does* flush.
        // note: we don't flush here; this IOUtils method does it for us
        
        byte[] bytes = baout.toByteArray();
        bytes = new String(bytes, "UTF16").getBytes("US-ASCII");
        assertTrue("Content differs", Arrays.equals(inData, bytes));
    }

    public void testCopy_readerToOutputStream_Encoding_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        try {
            IOUtils.copy((Reader) null, out, "UTF16");
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testCopy_readerToOutputStream_Encoding_nullOut() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        try {
            IOUtils.copy(reader, (OutputStream) null, "UTF16");
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testCopy_readerToOutputStream_Encoding_nullEncoding() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, false, true);

        IOUtils.copy(reader, out, null);
        // note: this method *does* flush.
        // 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_readerToWriter() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");

        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        YellOnFlushAndCloseOutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(baout, "US-ASCII");

        int count = IOUtils.copy(reader, writer);
        out.off();
        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_readerToWriter_nullIn() throws Exception {
        ByteArrayOutputStream baout = new ByteArrayOutputStream();
        OutputStream out = new YellOnFlushAndCloseOutputStream(baout, true, true);
        Writer writer = new OutputStreamWriter(out, "US-ASCII");
        try {
            IOUtils.copy((Reader) null, writer);
            fail();
        } catch (NullPointerException ex) {}
    }

    public void testCopy_readerToWriter_nullOut() throws Exception {
        InputStream in = new ByteArrayInputStream(inData);
        in = new YellOnCloseInputStream(in);
        Reader reader = new InputStreamReader(in, "US-ASCII");
        try {
            IOUtils.copy(reader, (Writer) null);
            fail();
        } catch (NullPointerException ex) {}
    }

    /**
     * Test Copying file > 2GB  - see issue# IO-84
     */
    public void testCopy_readerToWriter_IO84() throws Exception {
        long size = (long)Integer.MAX_VALUE + (long)1;
        Reader reader = new NullReader(size);
        Writer writer = new NullWriter();

        // Test copy() method
        assertEquals(-1, IOUtils.copy(reader, writer));

        // reset the input
        reader.close();

        // Test copyLarge() method
        assertEquals("copyLarge()", size, IOUtils.copyLarge(reader, writer));

    }

}

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