/*
* Copyright (C) 2010 The Android Open Source Project
*
* 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 libcore.java.lang;
import java.lang.reflect.Field;
import java.lang.reflect.Modifier;
import java.nio.ByteBuffer;
import java.nio.CharBuffer;
import java.nio.ReadOnlyBufferException;
import java.nio.charset.Charset;
import java.nio.charset.CharsetDecoder;
import java.nio.charset.CharsetEncoder;
import java.nio.charset.CoderResult;
import java.util.Arrays;
import java.util.Locale;
import junit.framework.TestCase;
public class StringTest extends TestCase {
public void testIsEmpty() {
assertTrue("".isEmpty());
assertFalse("x".isEmpty());
}
// The evil decoder keeps hold of the CharBuffer it wrote to.
private static final class EvilCharsetDecoder extends CharsetDecoder {
private static char[] chars;
public EvilCharsetDecoder(Charset cs) {
super(cs, 1.0f, 1.0f);
}
protected CoderResult decodeLoop(ByteBuffer in, CharBuffer out) {
chars = out.array();
int inLength = in.remaining();
for (int i = 0; i < inLength; ++i) {
in.put((byte) 'X');
out.put('Y');
}
return CoderResult.UNDERFLOW;
}
public static void corrupt() {
for (int i = 0; i < chars.length; ++i) {
chars[i] = '$';
}
}
}
// The evil encoder tries to write to the CharBuffer it was given to
// read from.
private static final class EvilCharsetEncoder extends CharsetEncoder {
public EvilCharsetEncoder(Charset cs) {
super(cs, 1.0f, 1.0f);
}
protected CoderResult encodeLoop(CharBuffer in, ByteBuffer out) {
int inLength = in.remaining();
for (int i = 0; i < inLength; ++i) {
in.put('x');
out.put((byte) 'y');
}
return CoderResult.UNDERFLOW;
}
}
private static final Charset EVIL_CHARSET = new Charset("evil", null) {
public boolean contains(Charset charset) { return false; }
public CharsetEncoder newEncoder() { return new EvilCharsetEncoder(this); }
public CharsetDecoder newDecoder() { return new EvilCharsetDecoder(this); }
};
public void testGetBytes_MaliciousCharset() {
try {
String s = "hi";
// Check that our encoder can't write to the input CharBuffer
// it was given.
s.getBytes(EVIL_CHARSET);
fail(); // We shouldn't have got here!
} catch (ReadOnlyBufferException expected) {
// We caught you trying to be naughty!
}
}
public void testString_BII() throws Exception {
byte[] bytes = "xa\u0666bx".getBytes("UTF-8");
assertEquals("a\u0666b", new String(bytes, 1, bytes.length - 2));
}
public void testString_BIIString() throws Exception {
byte[] bytes = "xa\u0666bx".getBytes("UTF-8");
assertEquals("a\u0666b", new String(bytes, 1, bytes.length - 2, "UTF-8"));
}
public void testString_BIICharset() throws Exception {
byte[] bytes = "xa\u0666bx".getBytes("UTF-8");
assertEquals("a\u0666b", new String(bytes, 1, bytes.length - 2, Charset.forName("UTF-8")));
}
public void testString_BCharset() throws Exception {
byte[] bytes = "a\u0666b".getBytes("UTF-8");
assertEquals("a\u0666b", new String(bytes, Charset.forName("UTF-8")));
}
public void testStringFromCharset_MaliciousCharset() {
Charset cs = EVIL_CHARSET;
byte[] bytes = new byte[] {(byte) 'h', (byte) 'i'};
final String result = new String(bytes, cs);
assertEquals("YY", result); // (Our decoder always outputs 'Y's.)
// Check that even if the decoder messes with the output CharBuffer
// after we've created a string from it, it doesn't affect the string.
EvilCharsetDecoder.corrupt();
assertEquals("YY", result);
}
public void test_getBytes_bad() throws Exception {
// Check that we use '?' as the replacement byte for invalid characters.
assertEquals("[97, 63, 98]", Arrays.toString("a\u0666b".getBytes("US-ASCII")));
assertEquals("[97, 63, 98]", Arrays.toString("a\u0666b".getBytes(Charset.forName("US-ASCII"))));
}
public void test_getBytes_UTF_8() {
// We have a fast path implementation of String.getBytes for UTF-8.
Charset cs = Charset.forName("UTF-8");
// Test the empty string.
assertEquals("[]", Arrays.toString("".getBytes(cs)));
// Test one-byte characters.
assertEquals("[0]", Arrays.toString("\u0000".getBytes(cs)));
assertEquals("[127]", Arrays.toString("\u007f".getBytes(cs)));
assertEquals("[104, 105]", Arrays.toString("hi".getBytes(cs)));
// Test two-byte characters.
assertEquals("[-62, -128]", Arrays.toString("\u0080".getBytes(cs)));
assertEquals("[-39, -90]", Arrays.toString("\u0666".getBytes(cs)));
assertEquals("[-33, -65]", Arrays.toString("\u07ff".getBytes(cs)));
assertEquals("[104, -39, -90, 105]", Arrays.toString("h\u0666i".getBytes(cs)));
// Test three-byte characters.
assertEquals("[-32, -96, -128]", Arrays.toString("\u0800".getBytes(cs)));
assertEquals("[-31, -120, -76]", Arrays.toString("\u1234".getBytes(cs)));
assertEquals("[-17, -65, -65]", Arrays.toString("\uffff".getBytes(cs)));
assertEquals("[104, -31, -120, -76, 105]", Arrays.toString("h\u1234i".getBytes(cs)));
// Test supplementary characters.
// Minimum supplementary character: U+10000
assertEquals("[-16, -112, -128, -128]", Arrays.toString("\ud800\udc00".getBytes(cs)));
// Random supplementary character: U+10381 Ugaritic letter beta
assertEquals("[-16, -112, -114, -127]", Arrays.toString("\ud800\udf81".getBytes(cs)));
// Maximum supplementary character: U+10FFFF
assertEquals("[-12, -113, -65, -65]", Arrays.toString("\udbff\udfff".getBytes(cs)));
// A high surrogate at end of string is an error replaced with '?'.
assertEquals("[104, 63]", Arrays.toString("h\ud800".getBytes(cs)));
// A high surrogate not followed by a low surrogate is an error replaced with '?'.
assertEquals("[104, 63, 105]", Arrays.toString("h\ud800i".getBytes(cs)));
}
public void test_new_String_bad() throws Exception {
// Check that we use U+FFFD as the replacement string for invalid bytes.
assertEquals("a\ufffdb", new String(new byte[] { 97, -2, 98 }, "US-ASCII"));
assertEquals("a\ufffdb", new String(new byte[] { 97, -2, 98 }, Charset.forName("US-ASCII")));
}
/**
* Tests a widely assumed performance characteristic of String.substring():
* that it reuses the original's backing array. Although behaviour should be
* correct even if this test fails, many applications may suffer
* significant performance degradation.
*/
public void testSubstringSharesBackingArray() throws IllegalAccessException {
String abcdefghij = "ABCDEFGHIJ";
String cdefg = abcdefghij.substring(2, 7);
assertSame(getBackingArray(abcdefghij), getBackingArray(cdefg));
}
/**
* Tests a widely assumed performance characteristic of string's copy
* constructor: that it ensures the backing array is the same length as the
* string. Although behaviour should be correct even if this test fails,
* many applications may suffer significant performance degradation.
*/
public void testStringCopiesAvoidHeapRetention() throws IllegalAccessException {
String abcdefghij = "ABCDEFGHIJ";
assertSame(getBackingArray(abcdefghij), getBackingArray(new String(abcdefghij)));
String cdefg = abcdefghij.substring(2, 7);
assertSame(getBackingArray(abcdefghij), getBackingArray(cdefg));
assertEquals(5, getBackingArray(new String(cdefg)).length);
}
/**
* Uses reflection to return the char[] backing the given string. This
* returns the actual backing array; which must not be modified.
*/
private char[] getBackingArray(String string) throws IllegalAccessException {
for (Field f : String.class.getDeclaredFields()) {
if (!Modifier.isStatic(f.getModifiers()) && f.getType() == char[].class) {
f.setAccessible(true);
return (char[]) f.get(string);
}
}
throw new UnsupportedOperationException("No chars[] field on String!");
}
/**
* Test that strings interned manually and then later loaded as literals
* maintain reference equality. http://b/3098960
*/
public void testInternBeforeLiteralIsLoaded() throws Exception{
String programmatic = Arrays.asList("5058", "9962", "1563", "5744").toString().intern();
String literal = (String) Class.forName("libcore.java.lang.StringTest$HasLiteral")
.getDeclaredField("literal").get(null);
assertEquals(System.identityHashCode(programmatic), System.identityHashCode(literal));
assertSame(programmatic, literal);
}
static class HasLiteral {
static String literal = "[5058, 9962, 1563, 5744]";
}
private static final String LATIN_CAPITAL_I = "I";
private static final String LATIN_CAPITAL_I_WITH_DOT_ABOVE = "\u0130";
private static final String LATIN_SMALL_I = "i";
private static final String LATIN_SMALL_DOTLESS_I = "\u0131";
private static final String[] LATIN_I_VARIANTS = {
LATIN_SMALL_I,
LATIN_SMALL_DOTLESS_I,
LATIN_CAPITAL_I,
LATIN_CAPITAL_I_WITH_DOT_ABOVE,
};
public void testCaseMapping_tr_TR() {
Locale trTR = new Locale("tr", "TR");
assertEquals(LATIN_SMALL_I, LATIN_SMALL_I.toLowerCase(trTR));
assertEquals(LATIN_SMALL_I, LATIN_CAPITAL_I_WITH_DOT_ABOVE.toLowerCase(trTR));
assertEquals(LATIN_SMALL_DOTLESS_I, LATIN_SMALL_DOTLESS_I.toLowerCase(trTR));
assertEquals(LATIN_CAPITAL_I, LATIN_CAPITAL_I.toUpperCase(trTR));
assertEquals(LATIN_CAPITAL_I_WITH_DOT_ABOVE, LATIN_CAPITAL_I_WITH_DOT_ABOVE.toUpperCase(trTR));
assertEquals(LATIN_CAPITAL_I_WITH_DOT_ABOVE, LATIN_SMALL_I.toUpperCase(trTR));
assertEquals(LATIN_CAPITAL_I, LATIN_SMALL_DOTLESS_I.toUpperCase(trTR));
assertEquals(LATIN_SMALL_DOTLESS_I, LATIN_CAPITAL_I.toLowerCase(trTR));
}
public void testCaseMapping_en_US() {
Locale enUs = new Locale("en", "US");
assertEquals(LATIN_CAPITAL_I, LATIN_SMALL_I.toUpperCase(enUs));
assertEquals(LATIN_CAPITAL_I, LATIN_CAPITAL_I.toUpperCase(enUs));
assertEquals(LATIN_CAPITAL_I_WITH_DOT_ABOVE, LATIN_CAPITAL_I_WITH_DOT_ABOVE.toUpperCase(enUs));
assertEquals(LATIN_SMALL_I, LATIN_SMALL_I.toLowerCase(enUs));
assertEquals(LATIN_SMALL_I, LATIN_CAPITAL_I.toLowerCase(enUs));
assertEquals(LATIN_SMALL_DOTLESS_I, LATIN_SMALL_DOTLESS_I.toLowerCase(enUs));
assertEquals(LATIN_CAPITAL_I, LATIN_SMALL_DOTLESS_I.toUpperCase(enUs));
// http://b/3325799: Android fails this with an extra combining "dot above".
assertEquals(LATIN_SMALL_I, LATIN_CAPITAL_I_WITH_DOT_ABOVE.toLowerCase(enUs));
}
public void testEqualsIgnoreCase_tr_TR() {
testEqualsIgnoreCase(new Locale("tr", "TR"));
}
public void testEqualsIgnoreCase_en_US() {
testEqualsIgnoreCase(new Locale("en", "US"));
}
/**
* String.equalsIgnoreCase should not depend on the locale.
*/
private void testEqualsIgnoreCase(Locale locale) {
Locale defaultLocale = Locale.getDefault();
Locale.setDefault(locale);
try {
for (String a : LATIN_I_VARIANTS) {
for (String b : LATIN_I_VARIANTS) {
if (!a.equalsIgnoreCase(b)) {
fail("Expected " + a + " to equal " + b + " in " + locale);
}
}
}
} finally {
Locale.setDefault(defaultLocale);
}
}
public void testRegionMatches_ignoreCase_en_US() {
testRegionMatches_ignoreCase(new Locale("en", "US"));
}
public void testRegionMatches_ignoreCase_tr_TR() {
testRegionMatches_ignoreCase(new Locale("tr", "TR"));
}
private void testRegionMatches_ignoreCase(Locale locale) {
Locale defaultLocale = Locale.getDefault();
Locale.setDefault(locale);
try {
for (String a : LATIN_I_VARIANTS) {
for (String b : LATIN_I_VARIANTS) {
if (!a.regionMatches(true, 0, b, 0, b.length())) {
fail("Expected " + a + " to equal " + b + " in " + locale);
}
}
}
} finally {
Locale.setDefault(defaultLocale);
}
}
// http://code.google.com/p/android/issues/detail?id=15266
public void test_replaceAll() throws Exception {
assertEquals("project_Id", "projectId".replaceAll("(?!^)(\\p{Upper})(?!$)", "_$1"));
}
}