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/*
* Copyright (C) 2013 The Guava Authors
*
* Licensed 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 com.google.common.io;
import static org.junit.Assert.assertThrows;
import java.io.IOException;
import java.nio.CharBuffer;
import junit.framework.TestCase;
/**
* Tests for {@link CharSequenceReader}.
*
* @author Colin Decker
*/
public class CharSequenceReaderTest extends TestCase {
public void testReadEmptyString() throws IOException {
assertReadsCorrectly("");
}
public void testReadsStringsCorrectly() throws IOException {
assertReadsCorrectly("abc");
assertReadsCorrectly("abcde");
assertReadsCorrectly("abcdefghijkl");
assertReadsCorrectly(
""
+ "abcdefghijklmnopqrstuvwxyz\n"
+ "ABCDEFGHIJKLMNOPQRSTUVWXYZ\r"
+ "0123456789\r\n"
+ "!@#$%^&*()-=_+\t[]{};':\",./<>?\\| ");
}
public void testMarkAndReset() throws IOException {
String string = "abcdefghijklmnopqrstuvwxyz";
CharSequenceReader reader = new CharSequenceReader(string);
assertTrue(reader.markSupported());
assertEquals(string, readFully(reader));
assertFullyRead(reader);
// reset and read again
reader.reset();
assertEquals(string, readFully(reader));
assertFullyRead(reader);
// reset, skip, mark, then read the rest
reader.reset();
assertEquals(5, reader.skip(5));
reader.mark(Integer.MAX_VALUE);
assertEquals(string.substring(5), readFully(reader));
assertFullyRead(reader);
// reset to the mark and then read the rest
reader.reset();
assertEquals(string.substring(5), readFully(reader));
assertFullyRead(reader);
}
public void testIllegalArguments() throws IOException {
CharSequenceReader reader = new CharSequenceReader("12345");
char[] buf = new char[10];
assertThrows(IndexOutOfBoundsException.class, () -> reader.read(buf, 0, 11));
assertThrows(IndexOutOfBoundsException.class, () -> reader.read(buf, 10, 1));
assertThrows(IndexOutOfBoundsException.class, () -> reader.read(buf, 11, 0));
assertThrows(IndexOutOfBoundsException.class, () -> reader.read(buf, -1, 5));
assertThrows(IndexOutOfBoundsException.class, () -> reader.read(buf, 5, -1));
assertThrows(IndexOutOfBoundsException.class, () -> reader.read(buf, 0, 11));
assertThrows(IllegalArgumentException.class, () -> reader.skip(-1));
assertThrows(IllegalArgumentException.class, () -> reader.mark(-1));
}
public void testMethodsThrowWhenClosed() throws IOException {
CharSequenceReader reader = new CharSequenceReader("");
reader.close();
assertThrows(IOException.class, () -> reader.read());
assertThrows(IOException.class, () -> reader.read(new char[10]));
assertThrows(IOException.class, () -> reader.read(new char[10], 0, 10));
assertThrows(IOException.class, () -> reader.read(CharBuffer.allocate(10)));
assertThrows(IOException.class, () -> reader.skip(10));
assertThrows(IOException.class, () -> reader.ready());
assertThrows(IOException.class, () -> reader.mark(10));
assertThrows(IOException.class, () -> reader.reset());
}
/**
* Creates a CharSequenceReader wrapping the given CharSequence and tests that the reader produces
* the same sequence when read using each type of read method it provides.
*/
private static void assertReadsCorrectly(CharSequence charSequence) throws IOException {
String expected = charSequence.toString();
// read char by char
CharSequenceReader reader = new CharSequenceReader(charSequence);
for (int i = 0; i < expected.length(); i++) {
assertEquals(expected.charAt(i), reader.read());
}
assertFullyRead(reader);
// read all to one array
reader = new CharSequenceReader(charSequence);
char[] buf = new char[expected.length()];
assertEquals(expected.length() == 0 ? -1 : expected.length(), reader.read(buf));
assertEquals(expected, new String(buf));
assertFullyRead(reader);
// read in chunks to fixed array
reader = new CharSequenceReader(charSequence);
buf = new char[5];
StringBuilder builder = new StringBuilder();
int read;
while ((read = reader.read(buf, 0, buf.length)) != -1) {
builder.append(buf, 0, read);
}
assertEquals(expected, builder.toString());
assertFullyRead(reader);
// read all to one CharBuffer
reader = new CharSequenceReader(charSequence);
CharBuffer buf2 = CharBuffer.allocate(expected.length());
assertEquals(expected.length() == 0 ? -1 : expected.length(), reader.read(buf2));
Java8Compatibility.flip(buf2);
assertEquals(expected, buf2.toString());
assertFullyRead(reader);
// read in chunks to fixed CharBuffer
reader = new CharSequenceReader(charSequence);
buf2 = CharBuffer.allocate(5);
builder = new StringBuilder();
while (reader.read(buf2) != -1) {
Java8Compatibility.flip(buf2);
builder.append(buf2);
Java8Compatibility.clear(buf2);
}
assertEquals(expected, builder.toString());
assertFullyRead(reader);
// skip fully
reader = new CharSequenceReader(charSequence);
assertEquals(expected.length(), reader.skip(Long.MAX_VALUE));
assertFullyRead(reader);
// skip 5 and read the rest
if (expected.length() > 5) {
reader = new CharSequenceReader(charSequence);
assertEquals(5, reader.skip(5));
buf = new char[expected.length() - 5];
assertEquals(buf.length, reader.read(buf, 0, buf.length));
assertEquals(expected.substring(5), new String(buf));
assertFullyRead(reader);
}
}
private static void assertFullyRead(CharSequenceReader reader) throws IOException {
assertEquals(-1, reader.read());
assertEquals(-1, reader.read(new char[10], 0, 10));
assertEquals(-1, reader.read(CharBuffer.allocate(10)));
assertEquals(0, reader.skip(10));
}
private static String readFully(CharSequenceReader reader) throws IOException {
StringBuilder builder = new StringBuilder();
int read;
while ((read = reader.read()) != -1) {
builder.append((char) read);
}
return builder.toString();
}
}
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