Commons IO example source code file (FileWriterWithEncodingTest.java)

This example Commons IO source code file (FileWriterWithEncodingTest.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

exception, file, file, filewriter, filewriter, filewriterwithencoding, filewriterwithencoding, filewriterwithencodingtest, io, ioexception, ioexception, outputstreamwriter, override, string, util, writer

The Commons IO FileWriterWithEncodingTest.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.File;
import java.io.FileOutputStream;
import java.io.FileWriter;
import java.io.IOException;
import java.io.OutputStreamWriter;
import java.io.Writer;
import java.nio.charset.Charset;
import java.util.Map;

import junit.framework.AssertionFailedError;

import org.apache.commons.io.FileUtils;
import org.apache.commons.io.IOUtils;
import org.apache.commons.io.testtools.FileBasedTestCase;

/**
 * Tests that the encoding is actually set and used.
 *
 * @version $Revision: 1006295 $ $Date: 2010-10-10 15:15:51 +0100 (Sun, 10 Oct 2010) $
 */
public class FileWriterWithEncodingTest extends FileBasedTestCase {

    private String defaultEncoding;
    private File file1;
    private File file2;
    private String textContent;

    public FileWriterWithEncodingTest(String name) {
        super(name);
    }

    @Override
    public void setUp() {
        File encodingFinder = new File(getTestDirectory(), "finder.txt");
        OutputStreamWriter out = null;
        try {
            out = new OutputStreamWriter(new FileOutputStream(encodingFinder));
            defaultEncoding = out.getEncoding();
        } catch (IOException ex) {
            throw new RuntimeException(ex.getMessage());
        } finally {
            IOUtils.closeQuietly(out);
        }
        file1 = new File(getTestDirectory(), "testfile1.txt");
        file2 = new File(getTestDirectory(), "testfile2.txt");
        char[] arr = new char[1024];
        for (int i = 0; i < arr.length; i++) {
            arr[i] = (char) i;
        }
        textContent = new String(arr);
    }

    @Override
    public void tearDown() throws Exception {
        FileUtils.deleteDirectory(getTestDirectory());
        defaultEncoding = null;
        textContent = null;
    }

    //-----------------------------------------------------------------------
    public void testSameEncoding() throws Exception {
        FileWriter fw1 = null;
        FileWriterWithEncoding fw2 = null;
        try {
            fw1 = new FileWriter(file1);  // default encoding
            fw2 = new FileWriterWithEncoding(file2, defaultEncoding);
            assertEquals(true, file1.exists());
            assertEquals(true, file2.exists());
            
            fw1.write(textContent);
            fw2.write(textContent);
            
            fw1.flush();
            fw2.flush();
            checkFile(file1, file2);
            
        } finally {
            IOUtils.closeQuietly(fw1);
            IOUtils.closeQuietly(fw2);
        }
        assertEquals(true, file1.exists());
        assertEquals(true, file2.exists());
    }

    public void testDifferentEncoding() throws Exception {
        Map<String, Charset> map = Charset.availableCharsets();
        if (map.containsKey("UTF-16BE")) {
            FileWriter fw1 = null;
            FileWriterWithEncoding fw2 = null;
            try {
                fw1 = new FileWriter(file1);  // default encoding
                fw2 = new FileWriterWithEncoding(file2, defaultEncoding);
                assertEquals(true, file1.exists());
                assertEquals(true, file2.exists());
                
                fw1.write(textContent);
                fw2.write(textContent);
                
                fw1.flush();
                fw2.flush();
                try {
                    checkFile(file1, file2);
                    fail();
                } catch (AssertionFailedError ex) {
                    // success
                }
                
            } finally {
                IOUtils.closeQuietly(fw1);
                IOUtils.closeQuietly(fw2);
            }
            assertEquals(true, file1.exists());
            assertEquals(true, file2.exists());
        }
        if (map.containsKey("UTF-16LE")) {
            FileWriter fw1 = null;
            FileWriterWithEncoding fw2 = null;
            try {
                fw1 = new FileWriter(file1);  // default encoding
                fw2 = new FileWriterWithEncoding(file2, defaultEncoding);
                assertEquals(true, file1.exists());
                assertEquals(true, file2.exists());
                
                fw1.write(textContent);
                fw2.write(textContent);
                
                fw1.flush();
                fw2.flush();
                try {
                    checkFile(file1, file2);
                    fail();
                } catch (AssertionFailedError ex) {
                    // success
                }
                
            } finally {
                IOUtils.closeQuietly(fw1);
                IOUtils.closeQuietly(fw2);
            }
            assertEquals(true, file1.exists());
            assertEquals(true, file2.exists());
        }
    }

    //-----------------------------------------------------------------------
    public void testConstructor_File_encoding_badEncoding() {
        Writer writer = null;
        try {
            writer = new FileWriterWithEncoding(file1, "BAD-ENCODE");
            fail();
        } catch (IOException ex) {
            // expected
            assertEquals(false, file1.exists());
        } finally {
            IOUtils.closeQuietly(writer);
        }
        assertEquals(false, file1.exists());
    }

    //-----------------------------------------------------------------------
    public void testConstructor_File_directory() {
        Writer writer = null;
        try {
            writer = new FileWriterWithEncoding(getTestDirectory(), defaultEncoding);
            fail();
        } catch (IOException ex) {
            // expected
            assertEquals(false, file1.exists());
        } finally {
            IOUtils.closeQuietly(writer);
        }
        assertEquals(false, file1.exists());
    }

    //-----------------------------------------------------------------------
    public void testConstructor_File_nullFile() throws IOException {
        Writer writer = null;
        try {
            writer = new FileWriterWithEncoding((File) null, defaultEncoding);
            fail();
        } catch (NullPointerException ex) {
            // expected
            assertEquals(false, file1.exists());
        } finally {
            IOUtils.closeQuietly(writer);
        }
        assertEquals(false, file1.exists());
    }

    //-----------------------------------------------------------------------
    public void testConstructor_fileName_nullFile() throws IOException {
        Writer writer = null;
        try {
            writer = new FileWriterWithEncoding((String) null, defaultEncoding);
            fail();
        } catch (NullPointerException ex) {
            // expected
            assertEquals(false, file1.exists());
        } finally {
            IOUtils.closeQuietly(writer);
        }
        assertEquals(false, file1.exists());
    }

}