1 /*
   2  * Copyright (c) 2018, Oracle and/or its affiliates. All rights reserved.
   3  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
   4  *
   5  * This code is free software; you can redistribute it and/or modify it
   6  * under the terms of the GNU General Public License version 2 only, as
   7  * published by the Free Software Foundation.
   8  *
   9  * This code is distributed in the hope that it will be useful, but WITHOUT
  10  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
  11  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License
  12  * version 2 for more details (a copy is included in the LICENSE file that
  13  * accompanied this code).
  14  *
  15  * You should have received a copy of the GNU General Public License version
  16  * 2 along with this work; if not, write to the Free Software Foundation,
  17  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.
  18  *
  19  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA
  20  * or visit www.oracle.com if you need additional information or have any
  21  * questions.
  22  */
  23 
  24 import java.io.File;
  25 import java.io.FileInputStream;
  26 import java.io.FileReader;
  27 import java.io.FileWriter;
  28 import java.io.IOException;
  29 import java.io.InputStreamReader;
  30 import java.io.Reader;
  31 import java.nio.charset.Charset;
  32 import java.nio.charset.StandardCharsets;
  33 import org.testng.Assert;
  34 import org.testng.annotations.DataProvider;
  35 import org.testng.annotations.Test;
  36 
  37 /**
  38  * @test
  39  * @bug 8183554
  40  * @summary Test to verify the new Constructors that take a Charset.
  41  * @run testng ConstructorTest
  42  */
  43 public class ConstructorTest {
  44     static String USER_DIR = System.getProperty("user.dir", ".");
  45 
  46     public static enum ConstructorType {
  47         STRING,
  48         FILE
  49     }
  50 
  51     static final String TEST_STRING = "abc \u0100 \u0101 \u0555 \u07FD \u07FF";
  52     static final int BUFFER_SIZE = 8192;
  53 
  54     @DataProvider(name = "parameters")
  55     public Object[][] getParameters() throws IOException {
  56         File file1 = new File(USER_DIR, "FileReaderTest1.txt");
  57         File file2 = new File(USER_DIR, "FileReaderTest2.txt");
  58 
  59         return new Object[][]{
  60             {ConstructorType.STRING, file1, file2, StandardCharsets.UTF_8},
  61             {ConstructorType.FILE, file1, file2, StandardCharsets.UTF_8},
  62             {ConstructorType.STRING, file1, file2, StandardCharsets.ISO_8859_1},
  63             {ConstructorType.FILE, file1, file2, StandardCharsets.ISO_8859_1},
  64         };
  65     }
  66 
  67     /**
  68      * Verifies that the new constructors that take a Charset function the same
  69      * as an InputStreamReader on a FileInputStream as was recommended before
  70      * this change.
  71      *
  72      * @param type the type of the constructor
  73      * @param file1 file1 to be read with a FileReader
  74      * @param file2 file2 to be read with an InputStreamReader
  75      * @param charset the charset
  76      * @throws IOException
  77      */
  78     @Test(dataProvider = "parameters")
  79     void test(ConstructorType type, File file1, File file2, Charset charset)
  80             throws Exception {
  81         prepareFile(file1, TEST_STRING, charset);
  82         prepareFile(file2, TEST_STRING, charset);
  83 
  84         try (FileReader fr = getFileReader(type, file1, charset);
  85                 FileInputStream is = new FileInputStream(file2);
  86                 InputStreamReader isr = new InputStreamReader(is, charset);) {
  87             String result1 = readAll(fr, BUFFER_SIZE);
  88             String result2 = readAll(isr, BUFFER_SIZE);
  89             Assert.assertEquals(result1, result2);
  90         }
  91     }
  92 
  93     public String readAll(Reader reader, int bufferSize) throws IOException {
  94         StringBuilder sb = new StringBuilder();
  95         char[] buf = new char[bufferSize];
  96         int numRead;
  97         while ((numRead = reader.read(buf)) != -1) {
  98             if (numRead == buf.length) {
  99                 sb.append(buf);
 100             } else {
 101                 sb.append(String.valueOf(buf, 0, numRead));
 102             }
 103         }
 104         return sb.toString();
 105     }
 106 
 107     /*
 108      * Creates a FileReader over the given input file.
 109      */
 110     FileReader getFileReader(ConstructorType type, File file, Charset charset)
 111             throws IOException {
 112         switch (type) {
 113             case STRING:
 114                 return new FileReader(file.getPath(), charset);
 115             case FILE:
 116                 return new FileReader(file, charset);
 117         }
 118 
 119         return null;
 120     }
 121 
 122     void prepareFile(File file, String content, Charset charset) throws IOException {
 123         try (FileWriter writer = new FileWriter(file, charset);) {
 124             writer.write(content);
 125         }
 126     }
 127 }