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/**
* @test
* @bug 8017231 8020977 8054221
* @summary test StringJoiner::merge
* @modules java.base/jdk.internal.util
* @requires vm.bits == "64" & os.maxMemory > 4G
* @run testng/othervm -Xmx4g -XX:+CompactStrings MergeTest
*/
import java.util.StringJoiner;
import java.util.stream.Stream;
import org.testng.annotations.Test;
import static jdk.internal.util.ArraysSupport.SOFT_MAX_ARRAY_LENGTH;
import static org.testng.Assert .assertEquals;
import static org.testng.Assert .fail;
@Test
public class MergeTest {
private static final String[] PREFIXES = {"" , "{" , "@#$%" };
private static final String[] SUFFIXES = {"" , "}" , "*&%$" };
private static class Fixes {
public String pre0, suf0;
public String pre1, suf1;
public Fixes(String prefix0, String suffix0,
String prefix1, String suffix1) {
this .pre0 = prefix0;
this .suf0 = suffix0;
this .pre1 = prefix1;
this .suf1 = suffix1;
}
}
private static Stream<Fixes> fixesStream() {
Stream.Builder<Fixes> builder = Stream.builder();
for (final String prefix0 : PREFIXES) {
for (final String suffix0 : SUFFIXES) {
for (final String prefix1 : PREFIXES) {
for (final String suffix1 : SUFFIXES) {
builder.accept(new Fixes(prefix0, suffix0,
prefix1, suffix1));
}
}
}
}
return builder.build();
}
@Test(expectedExceptions = {NullPointerException.class })
public void testNull() {
StringJoiner sj = new StringJoiner("," , "{" , "}" );
sj.merge(null );
}
public void testSimple() {
fixesStream().forEach(fixes -> {
StringJoiner sj = new StringJoiner("," , fixes.pre0, fixes.suf0);
StringJoiner other = new StringJoiner("," , fixes.pre1, fixes.suf1);
Stream.of("a" , "b" , "c" ).forEachOrdered(sj::add);
Stream.of("d" , "e" , "f" ).forEachOrdered(other::add);
sj.merge(other);
assertEquals(sj.toString(), fixes.pre0 + "a,b,c,d,e,f" + fixes.suf0);
});
}
public void testEmptyOther() {
fixesStream().forEach(fixes -> {
StringJoiner sj = new StringJoiner("," , fixes.pre0, fixes.suf0);
StringJoiner other = new StringJoiner("," , fixes.pre1, fixes.suf1);
Stream.of("a" , "b" , "c" ).forEachOrdered(sj::add);
sj.merge(other);
assertEquals(sj.toString(), fixes.pre0 + "a,b,c" + fixes.suf0);
other.setEmptyValue("EMPTY" );
sj.merge(other);
assertEquals(sj.toString(), fixes.pre0 + "a,b,c" + fixes.suf0);
});
}
public void testEmptyThis() {
fixesStream().forEach(fixes -> {
StringJoiner sj = new StringJoiner("," , fixes.pre0, fixes.suf0);
StringJoiner other = new StringJoiner(":" , fixes.pre1, fixes.suf1);
Stream.of("d" , "e" , "f" ).forEachOrdered(other::add);
sj.merge(other);
assertEquals(sj.toString(), fixes.pre0 + "d:e:f" + fixes.suf0);
sj = new StringJoiner("," , fixes.pre0, fixes.suf0).setEmptyValue("EMPTY" );
assertEquals(sj.toString(), "EMPTY" );
sj.merge(other);
assertEquals(sj.toString(), fixes.pre0 + "d:e:f" + fixes.suf0);
});
}
public void testEmptyBoth() {
fixesStream().forEach(fixes -> {
StringJoiner sj = new StringJoiner("," , fixes.pre0, fixes.suf0);
StringJoiner other = new StringJoiner(":" , fixes.pre1, fixes.suf1);
sj.merge(other);
assertEquals(sj.toString(), fixes.pre0 + fixes.suf0);
other.setEmptyValue("NOTHING" );
sj.merge(other);
assertEquals(sj.toString(), fixes.pre0 + fixes.suf0);
sj = new StringJoiner("," , fixes.pre0, fixes.suf0).setEmptyValue("EMPTY" );
assertEquals(sj.toString(), "EMPTY" );
sj.merge(other);
assertEquals(sj.toString(), "EMPTY" );
});
}
public void testCascadeEmpty() {
fixesStream().forEach(fixes -> {
StringJoiner sj = new StringJoiner("," , fixes.pre0, fixes.suf0);
StringJoiner o1 = new StringJoiner(":" , fixes.pre1, fixes.suf1).setEmptyValue("Empty1" );
StringJoiner o2 = new StringJoiner("," , "<" , ">" ).setEmptyValue("Empty2" );
o1.merge(o2);
assertEquals(o1.toString(), "Empty1" );
sj.merge(o1);
assertEquals(sj.toString(), fixes.pre0 + fixes.suf0);
});
}
public void testDelimiter() {
fixesStream().forEach(fixes -> {
StringJoiner sj = new StringJoiner("," , fixes.pre0, fixes.suf0);
StringJoiner other = new StringJoiner(":" , fixes.pre1, fixes.suf1);
Stream.of("a" , "b" , "c" ).forEachOrdered(sj::add);
Stream.of("d" , "e" , "f" ).forEachOrdered(other::add);
sj.merge(other);
assertEquals(sj.toString(), fixes.pre0 + "a,b,c,d:e:f" + fixes.suf0);
});
}
public void testMergeSelf() {
fixesStream().forEach(fixes -> {
final StringJoiner sj = new StringJoiner("," , fixes.pre0, fixes.suf0).add("a" ).add("b" );
assertEquals(sj.merge(sj).toString(), fixes.pre0 + "a,b,a,b" + fixes.suf0);
assertEquals(sj.merge(sj).toString(), fixes.pre0 + "a,b,a,b,a,b,a,b" + fixes.suf0);
});
}
public void OOM() {
String maxString = "*" .repeat(SOFT_MAX_ARRAY_LENGTH);
try {
StringJoiner sj1 = new StringJoiner("" , "" , "" );
sj1.add(maxString);
StringJoiner sj2 = new StringJoiner("" , "" , "" );
sj2.add(maxString);
sj1.merge(sj2);
fail("Should have thrown OutOfMemoryError" );
} catch (OutOfMemoryError ex) {
// okay
}
}
}
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