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HW3: Fixed heresy

This commit is contained in:
Claudio Maggioni 2019-12-17 09:23:19 +01:00
parent 601abefbcf
commit 2dda0a2bff
2 changed files with 72 additions and 86 deletions
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115
hw3/.idea/workspace.xml
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@ -222,7 +221,7 @@
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@ -266,9 +265,9 @@
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43
hw3/src/streams/FileLinesProcessor.java
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@ -46,40 +46,41 @@ public class FileLinesProcessor {
public Map<Character, Long> countCharsOccurrences() throws IOException {
return getLines()
.map(String::chars)
.reduce(IntStream.of(), IntStream::concat)
.flatMapToInt(String::chars)
.boxed()
.collect(Collectors.groupingBy(i -> (char) (i & 0xFFFF), Collectors.counting()));
.collect(Collectors.groupingBy(i -> (char) i.intValue(), Collectors.counting()));
}
public Map<Character, Long> countCharsOccurrences(int n) throws IOException {
return getLines()
.map(String::chars)
.reduce(IntStream.of(), IntStream::concat)
.boxed()
.collect(Collectors.groupingBy(i -> (char) (i & 0xFFFF), Collectors.counting()))
return countCharsOccurrences()
.entrySet()
.stream()
.filter(e -> e.getValue() > n)
.collect(Collectors.toMap(Map.Entry::getKey, Map.Entry::getValue));
}
private static <T> void assertEquals(T o1, T o2) {
if (o1 != o2 && o2 == null || !o2.equals(o1)) {
throw new AssertionError(o1 + " != " + o2);
}
}
public static void main(final String... args) throws IOException {
final FileLinesProcessor processor = new FileLinesProcessor("ex3_test.txt");
assert processor.fileLinesAsBytes()[0][1] == 'b';
assert processor.fileLinesAsBytes()[1][2] == 'z';
assert processor.countByNumberOfSpaces(0) == 2; // (i.e., "abc" and "xyz")
assert processor.countByNumberOfSpaces(2) == 1; // (i.e., "play with streams")
assert "axhp".equals(processor.concatNth(0));
assert "byel".equals(processor.concatNth(1));
assert "ly".equals(processor.concatNth(3));
assertEquals(processor.fileLinesAsBytes()[0][1], (byte) 'b');
assertEquals(processor.fileLinesAsBytes()[1][2], (byte) 'z');
assertEquals(processor.countByNumberOfSpaces(0), 2L); // (i.e., "abc" and "xyz")
assertEquals(processor.countByNumberOfSpaces(2), 1L); // (i.e., "play with streams")
assertEquals(processor.concatNth(0), "axhp");
assertEquals(processor.concatNth(1), "byel");
assertEquals(processor.concatNth(3), "ly");
final Map<Integer, List<String>> expected = new HashMap<>();
expected.put(3, Arrays.asList("abc", "xyz"));
expected.put(11, Collections.singletonList("hello world"));
expected.put(17, Collections.singletonList("play with streams"));
assert expected.equals(processor.groupByLineLength()); // Expected result: {3=[abc, xyz], 11=[hello world],
// 17=[play with streams]}
assertEquals(processor.groupByLineLength(), expected); // Expected result: {3=[abc, xyz], 11=[hello world],
// 17=[play with streams]}
final Map<Character, Long> expected2 = new HashMap<>();
expected2.put(' ', 3L);
@ -101,14 +102,14 @@ public class FileLinesProcessor {
expected2.put('x', 1L);
expected2.put('y', 2L);
expected2.put('z', 1L);
assert expected2.equals(processor.countCharsOccurrences()); // Expected result { =3, a=3, b=1, c=1, d=1, e=2,
// h=2, i=1, l=4, m=1, o=2, p=1, r=2, s=2, t=2, w=2,
// x=1, y=2, z=1}
assertEquals(processor.countCharsOccurrences(), expected2); // Expected result { =3, a=3, b=1, c=1, d=1, e=2,
// h=2, i=1, l=4, m=1, o=2, p=1, r=2, s=2, t=2, w=2,
// x=1, y=2, z=1}
final Map<Character, Long> expected3 = new HashMap<>();
expected3.put(' ', 3L);
expected3.put('a', 3L);
expected3.put('l', 4L);
assert expected3.equals(processor.countCharsOccurrences(2)); // Expected result: { =3, a=3, l=4}
assertEquals(processor.countCharsOccurrences(2), expected3); // Expected result: { =3, a=3, l=4}
System.out.println("OK");
}