BlockStateTest.java

import com.google.common.collect.ImmutableSet;
import com.google.common.collect.Sets;

import java.util.ArrayList;
import java.util.Arrays;
import java.util.List;
import java.util.Set;

public class BlockStateTest {
    public static void main(String[] args) {
        BlockState state = new BlockState(
                1965,
                new EnumBlockStateProperty("facing", HorizontalFacingProperty.NORTH),
                new EnumBlockStateProperty("half", HalfProperty.BOTTOM),
                new EnumBlockStateProperty("shape", ShapeProperty.STRAIGHT),
                new BooleanBlockStateProperty("waterlogged", false)
        );
    }
}

class BlockState {
    final double defaultState;

    BlockState(double defaultState, BlockStateProperty... properties) {
        this.defaultState = defaultState;
        List<Set<String>> values = new ArrayList<>();
        List<String> defaults = new ArrayList<>();
        for (final BlockStateProperty property : properties) {
            values.add(ImmutableSet.copyOf(property.values));
            defaults.add(property.value);
        }
        final Set<List<String>> states = Sets.cartesianProduct(values);
        double offset = defaultState;
        for (final List<String> state : states) {
            if (state.equals(defaults)) break;
            offset--;
        }
        for (final List<String> state : states) {
            System.out.println(offset + " " + state);
            offset++;
        }
    }
}

class BlockStateProperty {
    final String name;
    final String value;
    final String[] values;

    BlockStateProperty(String name, String value, String[] values) {
        this.name = name;
        this.value = value;
        this.values = values;
    }
}

class BooleanBlockStateProperty extends BlockStateProperty {
    BooleanBlockStateProperty(String name, boolean value) {
        super(name, value ? "true" : "false", new String[]{"true", "false"});
    }
}

class EnumBlockStateProperty extends BlockStateProperty {
    EnumBlockStateProperty(String name, Enum<?> value) {
        super(name, value.name().toLowerCase(),
                Arrays.stream(value.getClass().getEnumConstants())
                        .map(e -> e.name().toLowerCase())
                        .toArray(String[]::new)
        );
    }
}

enum HorizontalFacingProperty {
    NORTH,
    SOUTH,
    WEST,
    EAST;
}

enum HalfProperty {
    TOP,
    BOTTOM;
}

enum ShapeProperty {
    STRAIGHT,
    INNER_LEFT,
    INNER_RIGHT,
    OUTER_LEFT,
    OUTER_RIGHT;
}