Commons IO example source code file (ReaderInputStreamTest.java)

This example Commons IO source code file (ReaderInputStreamTest.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

io, ioexception, ioexception, large_test_string, random, readerinputstream, readerinputstream, string, string, stringbuilder, stringreader, testcase, utf-16, utf-8, utf-8, util

The Commons IO ReaderInputStreamTest.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.input;

import java.io.IOException;
import java.io.StringReader;
import java.util.Random;

import junit.framework.TestCase;

public class ReaderInputStreamTest extends TestCase {
    private static final String TEST_STRING = "\u00e0 peine arriv\u00e9s nous entr\u00e2mes dans sa chambre";
    private static final String LARGE_TEST_STRING;
    
    static {
        StringBuilder buffer = new StringBuilder();
        for (int i=0; i<100; i++) {
            buffer.append(TEST_STRING);
        }
        LARGE_TEST_STRING = buffer.toString();
    }
    
    private Random random = new Random();
    
    private void testWithSingleByteRead(String testString, String charsetName) throws IOException {
        byte[] bytes = testString.getBytes(charsetName);
        ReaderInputStream in = new ReaderInputStream(new StringReader(testString), charsetName);
        for (int i=0; i<bytes.length; i++) {
            int read = in.read();
            assertTrue(read >= 0);
            assertTrue(read <= 255);
            assertEquals(bytes[i], (byte)read);
        }
        assertEquals(-1, in.read());
    }
    
    private void testWithBufferedRead(String testString, String charsetName) throws IOException {
        byte[] expected = testString.getBytes(charsetName);
        ReaderInputStream in = new ReaderInputStream(new StringReader(testString), charsetName);
        byte[] buffer = new byte[128];
        int offset = 0;
        while (true) {
            int bufferOffset = random.nextInt(64);
            int bufferLength = random.nextInt(64);
            int read = in.read(buffer, bufferOffset, bufferLength);
            if (read == -1) {
                assertEquals(offset, expected.length);
                break;
            } else {
                assertTrue(read <= bufferLength);
                while (read > 0) {
                    assertTrue(offset < expected.length);
                    assertEquals(expected[offset], buffer[bufferOffset]);
                    offset++;
                    bufferOffset++;
                    read--;
                }
            }
        }
    }
    
    public void testUTF8WithSingleByteRead() throws IOException {
        testWithSingleByteRead(TEST_STRING, "UTF-8");
    }
    
    public void testLargeUTF8WithSingleByteRead() throws IOException {
        testWithSingleByteRead(LARGE_TEST_STRING, "UTF-8");
    }
    
    public void testUTF8WithBufferedRead() throws IOException {
        testWithBufferedRead(TEST_STRING, "UTF-8");
    }
    
    public void testLargeUTF8WithBufferedRead() throws IOException {
        testWithBufferedRead(LARGE_TEST_STRING, "UTF-8");
    }
    
    public void testUTF16WithSingleByteRead() throws IOException {
        testWithSingleByteRead(TEST_STRING, "UTF-16");
    }
    
    public void testReadZero() throws Exception {
        ReaderInputStream r = new ReaderInputStream(new StringReader("test"));
        byte[] bytes = new byte[30];
        assertEquals(0, r.read(bytes, 0, 0));
    }
}