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Commons IO example source code file (CharSequenceReaderTest.java)

This example Commons IO source code file (CharSequenceReaderTest.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

b, bar, charsequencereader, charsequencereader, charsequencereadertest, f, foo, foobar, io, ioexception, ioexception, none, none, reader, reader

The Commons IO CharSequenceReaderTest.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.Reader;

import junit.framework.TestCase;

/**
 * Test case for {@link CharSequenceReader}.
 *
 * @version $Revision: 806006 $ $Date: 2009-08-20 00:02:25 +0100 (Thu, 20 Aug 2009) $
 */
public class CharSequenceReaderTest extends TestCase {
    private static final char NONE = (new char[1])[0];

    /**
     * Contruct a new test case.
     * @param name The name of the test
     */
    public CharSequenceReaderTest(String name) {
        super(name);
    }

    /** Test {@link Reader#close()}. */
    public void testClose() throws IOException {
        Reader reader = new CharSequenceReader("FooBar");
        checkRead(reader, "Foo");
        reader.close();
        checkRead(reader, "Foo");
    }

    /** Test {@link Reader#markSupported()}. */
    public void testMarkSupported() {
        Reader reader = new CharSequenceReader("FooBar");
        assertTrue(reader.markSupported());
    }

    /** Test {@link Reader#mark(int)}. */
    public void testMark() throws IOException {
        Reader reader = new CharSequenceReader("FooBar");
        checkRead(reader, "Foo");
        reader.mark(0);
        checkRead(reader, "Bar");
        reader.reset();
        checkRead(reader, "Bar");
        reader.close();
        checkRead(reader, "Foo");
        reader.reset();
        checkRead(reader, "Foo");
    }

    /** Test {@link Reader#skip(long)}. */
    public void testSkip() throws IOException {
        Reader reader = new CharSequenceReader("FooBar");
        assertEquals(3, reader.skip(3));
        checkRead(reader, "Bar");
        assertEquals(-1, reader.skip(3));
        reader.reset();
        assertEquals(2, reader.skip(2));
        assertEquals(4, reader.skip(10));
        assertEquals(-1, reader.skip(1));
        reader.close();
        assertEquals(6, reader.skip(20));
        assertEquals(-1, reader.read());
    }

    /** Test {@link Reader#read()}. */
    public void testRead() throws IOException {
        Reader reader = new CharSequenceReader("Foo");
        assertEquals('F', reader.read());
        assertEquals('o', reader.read());
        assertEquals('o', reader.read());
        assertEquals(-1, reader.read());
        assertEquals(-1, reader.read());
    }

    /** Test {@link Reader#read(char[])}. */
    public void testReadCharArray() throws IOException {
        Reader reader = new CharSequenceReader("FooBar");
        char[] chars = new char[2];
        assertEquals(2, reader.read(chars));
        checkArray(new char[] {'F', 'o'}, chars);
        chars = new char[3];
        assertEquals(3, reader.read(chars));
        checkArray(new char[] {'o', 'B', 'a'}, chars);
        chars = new char[3];
        assertEquals(1, reader.read(chars));
        checkArray(new char[] {'r', NONE, NONE}, chars);
        assertEquals(-1, reader.read(chars));
    }

    /** Test {@link Reader#read(char[], int, int)}. */
    public void testReadCharArrayPortion() throws IOException {
        char[] chars = new char[10];
        Reader reader = new CharSequenceReader("FooBar");
        assertEquals(3, reader.read(chars, 3, 3));
        checkArray(new char[] {NONE, NONE, NONE, 'F', 'o', 'o'}, chars);
        assertEquals(3, reader.read(chars, 0, 3));
        checkArray(new char[] {'B', 'a', 'r', 'F', 'o', 'o', NONE}, chars);
        assertEquals(-1, reader.read(chars));
    }

    private void checkRead(Reader reader, String expected) throws IOException {
        for (int i = 0; i < expected.length(); i++) {
            assertEquals("Read[" + i + "] of '" + expected + "'", 
                    expected.charAt(i), (char)reader.read());
        }
    }
    private void checkArray(char[] expected, char[] actual) {
        for (int i = 0; i < expected.length; i++) {
            assertEquals("Compare[" +i + "]", expected[i], actual[i]);
        }
    }
}

Other Commons IO examples (source code examples)

Here is a short list of links related to this Commons IO CharSequenceReaderTest.java source code file:

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