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59 lines
1.3 KiB
Java
59 lines
1.3 KiB
Java
import java.util.List;
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import java.util.stream.IntStream;
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import java.util.stream.Stream;
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public class Board {
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final List<String> digits;
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public Board(List<String> digits) {
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this.digits = digits;
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}
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public Stream<Stream<String>> rows() {
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return IntStream.range(0, 9).boxed()
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.map(this::row);
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}
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Stream<String> row(int row) {
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return IntStream.range(0, 9).boxed()
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.map(column -> digit(row, column));
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}
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public Stream<Stream<String>> columns() {
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return IntStream.range(0, 9).boxed()
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.map(this::column);
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}
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Stream<String> column(int column) {
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return IntStream.range(0, 9).boxed()
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.map(row -> digit(row, column));
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}
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Stream<Stream<String>> squares() {
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return IntStream.range(0, 3).boxed()
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.flatMap(this::squares);
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}
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private Stream<Stream<String>> squares(int squareRow) {
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return IntStream.range(0, 3).boxed()
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.map(squareColumn -> square(squareRow, squareColumn));
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}
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private Stream<String> square(int squareRow, int squareColumn) {
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return IntStream.range(squareRow*3, squareRow*3+3).boxed()
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.flatMap(row -> squareDigitsInRow(row, squareColumn));
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}
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Stream<String> squareDigitsInRow(int row, int squareColumn) {
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return IntStream.range(squareColumn*3, squareColumn*3+3).boxed()
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.map(column -> digit(row, column));
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}
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String digit(int row, int column) {
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int idx = row * 9 + column;
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return digits.get(idx);
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}
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}
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