Commons IO example source code file (WriterOutputStreamTest.java)

This example Commons IO source code file (WriterOutputStreamTest.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, string, stringbuilder, stringwriter, stringwriter, testcase, utf-16, utf-8, utf-8, util, writeroutputstream, writeroutputstream

The Commons IO WriterOutputStreamTest.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.IOException;
import java.io.StringWriter;
import java.util.Random;

import junit.framework.TestCase;

public class WriterOutputStreamTest 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 testWithSingleByteWrite(String testString, String charsetName) throws IOException {
        byte[] bytes = testString.getBytes(charsetName);
        StringWriter writer = new StringWriter();
        WriterOutputStream out = new WriterOutputStream(writer, charsetName);
        for (int i=0; i<bytes.length; i++) {
            out.write(bytes[i]);
        }
        out.close();
        assertEquals(testString, writer.toString());
    }
    
    private void testWithBufferedWrite(String testString, String charsetName) throws IOException {
        byte[] expected = testString.getBytes(charsetName);
        StringWriter writer = new StringWriter();
        WriterOutputStream out = new WriterOutputStream(writer, charsetName);
        int offset = 0;
        while (offset < expected.length) {
            int length = Math.min(random.nextInt(128), expected.length-offset);
            out.write(expected, offset, length);
            offset += length;
        }
        out.close();
        assertEquals(testString, writer.toString());
    }
    
    public void testUTF8WithSingleByteWrite() throws IOException {
        testWithSingleByteWrite(TEST_STRING, "UTF-8");
    }
    
    public void testLargeUTF8WithSingleByteWrite() throws IOException {
        testWithSingleByteWrite(LARGE_TEST_STRING, "UTF-8");
    }
    
    public void testUTF8WithBufferedWrite() throws IOException {
        testWithBufferedWrite(TEST_STRING, "UTF-8");
    }
    
    public void testLargeUTF8WithBufferedWrite() throws IOException {
        testWithBufferedWrite(LARGE_TEST_STRING, "UTF-8");
    }
    
    public void testUTF16WithSingleByteWrite() throws IOException {
        testWithSingleByteWrite(TEST_STRING, "UTF-16");
    }
    
    public void testFlush() throws IOException {
        StringWriter writer = new StringWriter();
        WriterOutputStream out = new WriterOutputStream(writer, "us-ascii", 1024, false);
        out.write("abc".getBytes("us-ascii"));
        assertEquals(0, writer.getBuffer().length());
        out.flush();
        assertEquals("abc", writer.toString());
    }
    
    public void testWriteImmediately() throws IOException {
        StringWriter writer = new StringWriter();
        WriterOutputStream out = new WriterOutputStream(writer, "us-ascii", 1024, true);
        out.write("abc".getBytes("us-ascii"));
        assertEquals("abc", writer.toString());
    }
}