package com.twelvemonkeys.io;
import com.twelvemonkeys.lang.ObjectAbstractTestCase;
import org.junit.Test;
import java.io.Reader;
import java.io.IOException;
import static org.junit.Assert.*;
/**
* ReaderAbstractTestCase
* <p/>
*
* @author <a href="mailto:harald.kuhr@gmail.com">Harald Kuhr</a>
* @author last modified by $Author: haku $
* @version $Id: //depot/branches/personal/haraldk/twelvemonkeys/release-2/twelvemonkeys-core/src/test/java/com/twelvemonkeys/io/ReaderAbstractTestCase.java#1 $
*/
public abstract class ReaderAbstractTestCase extends ObjectAbstractTestCase {
// Kindly provided by lipsum.org :-)
protected final String mInput =
"Cras tincidunt euismod tellus. Aenean a odio. " +
"Aenean metus. Sed tristique est non purus. Class aptent " +
"taciti sociosqu ad litora torquent per conubia nostra, per " +
"inceptos hymenaeos. Fusce vulputate dolor non mauris. " +
"Nullam nunc massa, pretium quis, ultricies a, varius quis, " +
"neque. Nam id nulla eu ante malesuada fermentum. Sed " +
"vulputate purus eget magna. Sed mollis. Curabitur enim " +
"diam, faucibus ac, hendrerit eu, consequat nec, augue.";
protected final Object makeObject() {
return makeReader();
}
protected Reader makeReader() {
return makeReader(mInput);
}
protected abstract Reader makeReader(String pInput);
@Test
public void testRead() throws IOException {
Reader reader = makeReader();
int count = 0;
int ch;
StringBuilder buffer = new StringBuilder(mInput.length());
while ((ch = reader.read()) > 0) {
count++;
buffer.append((char) ch);
}
assertEquals(mInput.length(), count);
assertEquals(mInput, buffer.toString());
}
@Test
public void testReadBuffer() throws IOException {
Reader reader = makeReader();
char[] chars = new char[mInput.length()];
StringBuilder buffer = new StringBuilder(mInput.length());
int count;
int offset = 0;
int lenght = chars.length;
while ((count = reader.read(chars, offset, lenght)) > 0) {
buffer.append(chars, offset, count);
offset += count;
lenght -= count;
}
assertEquals(mInput, buffer.toString());
assertEquals(mInput, new String(chars));
}
@Test
public void testSkipToEnd() throws IOException {
Reader reader = makeReader();
int toSkip = mInput.length();
while (toSkip > 0) {
long skipped = reader.skip(toSkip);
assertFalse("Skipped < 0", skipped < 0);
toSkip -= skipped;
}
assertEquals(0, toSkip);
}
@Test
public void testSkipToEndAndRead() throws IOException {
Reader reader = makeReader();
int toSkip = mInput.length();
while (toSkip > 0) {
toSkip -= reader.skip(toSkip);
}
assertEquals(reader.read(), -1);
}
// TODO: It's possible to support reset and not mark (resets to beginning of stream, for example)
@Test
public void testResetMarkSupported() throws IOException {
Reader reader = makeReader();
if (reader.markSupported()) {
// Mark at 0
reader.mark(mInput.length() / 4);
// Read one char
char ch = (char) reader.read();
reader.reset();
assertEquals(ch, (char) reader.read());
reader.reset();
// Read from start
StringBuilder first = new StringBuilder(mInput.length() / 4);
for (int i = 0; i < mInput.length() / 4; i++) {
first.append((char) reader.read());
}
reader.reset(); // 0
StringBuilder second = new StringBuilder(mInput.length() / 4);
for (int i = 0; i < mInput.length() / 4; i++) {
second.append((char) reader.read());
}
assertEquals(first.toString(), second.toString());
// Mark at 1/4
reader.mark(mInput.length() / 4);
// Read from 1/4
first = new StringBuilder(mInput.length() / 4);
for (int i = 0; i < mInput.length() / 4; i++) {
first.append((char) reader.read());
}
reader.reset(); // 1/4
second = new StringBuilder(mInput.length() / 4);
for (int i = 0; i < mInput.length() / 4; i++) {
second.append((char) reader.read());
}
assertEquals(first.toString(), second.toString());
// Read past limit
reader.read();
// This may or may not fail, depending on the stream
try {
reader.reset();
}
catch (IOException ioe) {
assertNotNull(ioe.getMessage());
}
}
}
@Test
public void testResetMarkNotSupported() throws IOException {
Reader reader = makeReader();
if (!reader.markSupported()) {
try {
reader.mark(mInput.length());
fail("Mark set, while markSupprted is false");
}
catch (IOException e) {
assertNotNull(e.getMessage());
}
// Read one char
char ch = (char) reader.read();
try {
reader.reset();
assertEquals(ch, (char) reader.read());
}
catch (IOException ioe) {
assertNotNull(ioe.getMessage());
}
// Read from start
StringBuilder first = new StringBuilder(mInput.length() / 4);
for (int i = 0; i < mInput.length() / 4; i++) {
first.append((char) reader.read());
}
try {
reader.reset(); // 0
StringBuilder second = new StringBuilder(mInput.length() / 4);
for (int i = 0; i < mInput.length() / 4; i++) {
second.append((char) reader.read());
}
assertEquals(first.toString(), second.toString());
}
catch (IOException ioe) {
assertNotNull(ioe.getMessage());
}
}
}
@Test
public void testReadAfterClose() throws IOException {
Reader reader = makeReader("foo bar");
reader.close();
try {
reader.read();
fail("Should not allow read after close");
}
catch (IOException ioe) {
assertNotNull(ioe.getMessage());
}
}
}