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/**
* @test
* @bug 8016846 8024341 8071479 8145006
* @summary Unit tests stream and lambda-based methods on Pattern and Matcher
* @library ../stream/bootlib
* @build java.base/java.util.stream.OpTestCase
* @run testng/othervm PatternStreamTest
*/
import org.testng.annotations.DataProvider;
import org.testng.annotations.Test;
import java.util.ArrayList;
import java.util.Arrays;
import java.util.ConcurrentModificationException;
import java.util.List;
import java.util.concurrent.atomic.AtomicInteger;
import java.util.function.Supplier;
import java.util.regex.MatchResult;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
import java.util.stream.Collectors;
import java.util.stream.LambdaTestHelpers;
import java.util.stream.OpTestCase;
import java.util.stream.Stream;
import java.util.stream.TestData;
import static org.testng.Assert.*;
@Test
public class PatternStreamTest extends OpTestCase {
@DataProvider(name = "Patterns")
public static Object[][] makeStreamTestData() {
// Each item must match the type signature of the consumer of this data
// String, String, Pattern
List<Object[]> data = new ArrayList<>();
String description = "All matches";
String input = "XXXXXX";
Pattern pattern = Pattern.compile("X");
data.add(new Object[]{description, input, pattern});
description = "Bounded every other match";
input = "XYXYXYYXYX";
pattern = Pattern.compile("X");
data.add(new Object[]{description, input, pattern});
description = "Every other match";
input = "YXYXYXYYXYXY";
pattern = Pattern.compile("X");
data.add(new Object[]{description, input, pattern});
description = "";
input = "awgqwefg1fefw4vssv1vvv1";
pattern = Pattern.compile("4");
data.add(new Object[]{description, input, pattern});
input = "afbfq\u00a3abgwgb\u00a3awngnwggw\u00a3a\u00a3ahjrnhneerh";
pattern = Pattern.compile("\u00a3a");
data.add(new Object[]{description, input, pattern});
input = "awgqwefg1fefw4vssv1vvv1";
pattern = Pattern.compile("1");
data.add(new Object[]{description, input, pattern});
input = "a\u4ebafg1fefw\u4eba4\u9f9cvssv\u9f9c1v\u672c\u672cvv";
pattern = Pattern.compile("1");
data.add(new Object[]{description, input, pattern});
input = "1\u56da23\u56da456\u56da7890";
pattern = Pattern.compile("\u56da");
data.add(new Object[]{description, input, pattern});
input = "1\u56da23\u9f9c\u672c\u672c\u56da456\u56da\u9f9c\u672c7890";
pattern = Pattern.compile("\u56da");
data.add(new Object[]{description, input, pattern});
description = "Empty input";
input = "";
pattern = Pattern.compile("\u56da");
data.add(new Object[]{description, input, pattern});
description = "Empty input with empty pattern";
input = "";
pattern = Pattern.compile("");
data.add(new Object[]{description, input, pattern});
description = "Multiple separators";
input = "This is,testing: with\tdifferent separators.";
pattern = Pattern.compile("[ \t,:.]");
data.add(new Object[]{description, input, pattern});
description = "Repeated separators within and at end";
input = "boo:and:foo";
pattern = Pattern.compile("o");
data.add(new Object[]{description, input, pattern});
description = "Many repeated separators within and at end";
input = "booooo:and:fooooo";
pattern = Pattern.compile("o");
data.add(new Object[]{description, input, pattern});
description = "Many repeated separators before last match";
input = "fooooo:";
pattern = Pattern.compile("o");
data.add(new Object[] {description, input, pattern});
return data.toArray(new Object[0][]);
}
@Test(dataProvider = "Patterns")
public void testPatternSplitAsStream(String description, String input, Pattern pattern) {
// Derive expected result from pattern.split
List<String> expected = Arrays.asList(pattern.split(input));
Supplier<Stream<String>> ss = () -> pattern.splitAsStream(input);
withData(TestData.Factory.ofSupplier(description, ss))
.stream(LambdaTestHelpers.identity())
.expectedResult(expected)
.exercise();
}
@Test(dataProvider = "Patterns")
public void testReplaceFirst(String description, String input, Pattern pattern) {
// Derive expected result from Matcher.replaceFirst(String )
String expected = pattern.matcher(input).replaceFirst("R");
String actual = pattern.matcher(input).replaceFirst(r -> "R");
assertEquals(actual, expected);
}
@Test(dataProvider = "Patterns")
public void testReplaceAll(String description, String input, Pattern pattern) {
// Derive expected result from Matcher.replaceAll(String )
String expected = pattern.matcher(input).replaceAll("R");
String actual = pattern.matcher(input).replaceAll(r -> "R");
assertEquals(actual, expected);
// Derive expected result from Matcher.find
Matcher m = pattern.matcher(input);
int expectedMatches = 0;
while (m.find()) {
expectedMatches++;
}
AtomicInteger actualMatches = new AtomicInteger();
pattern.matcher(input).replaceAll(r -> "R" + actualMatches.incrementAndGet());
assertEquals(expectedMatches, actualMatches.get());
}
@Test(dataProvider = "Patterns")
public void testMatchResults(String description, String input, Pattern pattern) {
// Derive expected result from Matcher.find
Matcher m = pattern.matcher(input);
List<MatchResultHolder> expected = new ArrayList<>();
while (m.find()) {
expected.add(new MatchResultHolder(m));
}
Supplier<Stream<MatchResult>> ss = () -> pattern.matcher(input).results();
withData(TestData.Factory.ofSupplier(description, ss))
.stream(s -> s.map(MatchResultHolder::new))
.expectedResult(expected)
.exercise();
}
@Test
public void testLateBinding() {
Pattern pattern = Pattern.compile(",");
StringBuilder sb = new StringBuilder("a,b,c,d,e");
Stream<String> stream = pattern.splitAsStream(sb);
sb.setLength(3);
assertEquals(Arrays.asList("a", "b"), stream.collect(Collectors.toList()));
stream = pattern.splitAsStream(sb);
sb.append(",f,g");
assertEquals(Arrays.asList("a", "b", "f", "g"), stream.collect(Collectors.toList()));
}
public void testFailfastMatchResults() {
Pattern p = Pattern.compile("X");
Matcher m = p.matcher("XX");
Stream<MatchResult> s = m.results();
m.find();
// Should start on the second match
assertEquals(s.count(), 1);
// Fail fast without short-circuit
// Exercises Iterator.forEachRemaining
m.reset();
try {
m.results().peek(mr -> m.reset()).count();
fail();
} catch (ConcurrentModificationException e) {
// Should reach here
}
m.reset();
try {
m.results().peek(mr -> m.find()).count();
fail();
} catch (ConcurrentModificationException e) {
// Should reach here
}
// Fail fast with short-circuit
// Exercises Iterator.hasNext/next
m.reset();
try {
m.results().peek(mr -> m.reset()).limit(2).count();
fail();
} catch (ConcurrentModificationException e) {
// Should reach here
}
m.reset();
try {
m.results().peek(mr -> m.find()).limit(2).count();
fail();
} catch (ConcurrentModificationException e) {
// Should reach here
}
}
public void testFailfastReplace() {
Pattern p = Pattern.compile("X");
Matcher m = p.matcher("XX");
// Fail fast without short-circuit
// Exercises Iterator.forEachRemaining
m.reset();
try {
m.replaceFirst(mr -> { m.reset(); return "Y"; });
fail();
} catch (ConcurrentModificationException e) {
// Should reach here
}
m.reset();
try {
m.replaceAll(mr -> { m.reset(); return "Y"; });
fail();
} catch (ConcurrentModificationException e) {
// Should reach here
}
}
// A holder of MatchResult that can compare
static class MatchResultHolder implements Comparable<MatchResultHolder> {
final MatchResult mr;
MatchResultHolder(Matcher m) {
this(m.toMatchResult());
}
MatchResultHolder(MatchResult mr) {
this.mr = mr;
}
@Override
public int compareTo(MatchResultHolder that) {
int c = that.mr.group().compareTo(this.mr.group());
if (c != 0)
return c;
c = Integer.compare(that.mr.start(), this.mr.start());
if (c != 0)
return c;
c = Integer.compare(that.mr.end(), this.mr.end());
if (c != 0)
return c;
c = Integer.compare(that.mr.groupCount(), this.mr.groupCount());
if (c != 0)
return c;
for (int g = 0; g < this.mr.groupCount(); g++) {
c = that.mr.group(g).compareTo(this.mr.group(g));
if (c != 0)
return c;
c = Integer.compare(that.mr.start(g), this.mr.start(g));
if (c != 0)
return c;
c = Integer.compare(that.mr.end(g), this.mr.end(g));
if (c != 0)
return c;
}
return 0;
}
@Override
public boolean equals(Object that) {
if (this == that) return true;
if (that == null || getClass() != that.getClass()) return false;
return this.compareTo((MatchResultHolder) that) == 0;
}
@Override
public int hashCode() {
return mr.group().hashCode();
}
}
}