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Navigator: Sort files and folders alphanumerically
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60 changes: 60 additions & 0 deletions
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...es/platform-model/src/main/java/com/shade/platform/model/util/AlphanumericComparator.java
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package com.shade.platform.model.util; | ||
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import com.shade.util.NotNull; | ||
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import java.util.Comparator; | ||
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public class AlphanumericComparator implements Comparator<CharSequence> { | ||
private static final AlphanumericComparator INSTANCE = new AlphanumericComparator(); | ||
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private AlphanumericComparator() { | ||
// prevents instantiation | ||
} | ||
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@NotNull | ||
public static AlphanumericComparator getInstance() { | ||
return INSTANCE; | ||
} | ||
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@Override | ||
public int compare(CharSequence o1, CharSequence o2) { | ||
final int len1 = o1.length(); | ||
final int len2 = o2.length(); | ||
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int i = 0; | ||
int j = 0; | ||
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while (i < len1 && j < len2) { | ||
final char ch1 = o1.charAt(i); | ||
final char ch2 = o2.charAt(i); | ||
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if (Character.isDigit(ch1) && Character.isDigit(ch2)) { | ||
int num1 = 0; | ||
int num2 = 0; | ||
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while (i < len1 && Character.isDigit(o1.charAt(i))) { | ||
num1 = num1 * 10 + Character.digit(o1.charAt(i), 10); | ||
i += 1; | ||
} | ||
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while (j < len2 && Character.isDigit(o2.charAt(j))) { | ||
num2 = num2 * 10 + Character.digit(o2.charAt(j), 10); | ||
j += 1; | ||
} | ||
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if (num1 != num2) { | ||
return num1 - num2; | ||
} | ||
} else { | ||
if (ch1 != ch2) { | ||
return ch1 - ch2; | ||
} | ||
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i += 1; | ||
j += 1; | ||
} | ||
} | ||
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return len1 - len2; | ||
} | ||
} |
70 changes: 70 additions & 0 deletions
70
modules/platform-model/src/test/java/com/shade/platform/util/AlphanumericComparatorTest.java
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package com.shade.platform.util; | ||
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import com.shade.platform.model.util.AlphanumericComparator; | ||
import com.shade.util.NotNull; | ||
import org.junit.jupiter.api.Assertions; | ||
import org.junit.jupiter.api.Test; | ||
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import java.util.ArrayList; | ||
import java.util.Collection; | ||
import java.util.List; | ||
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public class AlphanumericComparatorTest { | ||
@Test | ||
public void alphanumericComparatorTest() { | ||
alphanumericComparatorTestImpl( | ||
List.of("img12", "img10", "img2", "img1", "img100_1", "img100_11", "img100", "img100_10", "img100_5"), | ||
List.of("img1", "img2", "img10", "img12", "img100", "img100_1", "img100_5", "img100_10", "img100_11") | ||
); | ||
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alphanumericComparatorTestImpl( | ||
List.of("file1000", "file100", "file10", "file2", "file1", "file11", "file200", "file20", "file2a", "file2b"), | ||
List.of("file1", "file2", "file2a", "file2b", "file10", "file11", "file20", "file100", "file200", "file1000") | ||
); | ||
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alphanumericComparatorTestImpl( | ||
List.of("doc10", "doc2", "doc20", "doc1", "doc3", "doc15", "doc4"), | ||
List.of("doc1", "doc2", "doc3", "doc4", "doc10", "doc15", "doc20") | ||
); | ||
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alphanumericComparatorTestImpl( | ||
List.of("page2", "page12", "page3", "page22", "page4", "page13", "page23"), | ||
List.of("page2", "page3", "page4", "page12", "page13", "page22", "page23") | ||
); | ||
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alphanumericComparatorTestImpl( | ||
List.of("item-5", "item-1", "item-10", "item-2", "item-11", "item-3", "item-20", "item-15"), | ||
List.of("item-1", "item-2", "item-3", "item-5", "item-10", "item-11", "item-15", "item-20") | ||
); | ||
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alphanumericComparatorTestImpl( | ||
List.of("abc123def45", "abc12def345", "abc1234def5", "abc12345def4", "abc1234def45", "abc12345def456"), | ||
List.of("abc12def345", "abc123def45", "abc1234def5", "abc1234def45", "abc12345def4", "abc12345def456") | ||
); | ||
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alphanumericComparatorTestImpl( | ||
List.of("file01_v2", "file02_v1", "file10_v10", "file02_v10", "file10_v2", "file1_v10"), | ||
List.of("file01_v2", "file1_v10", "file02_v1", "file02_v10", "file10_v2", "file10_v10") | ||
); | ||
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alphanumericComparatorTestImpl( | ||
List.of("chapter-2.1.1", "chapter-10.1.1", "chapter-2.1.10", "chapter-10.1.2", "chapter-2.1.2"), | ||
List.of("chapter-2.1.1", "chapter-2.1.2", "chapter-2.1.10", "chapter-10.1.1", "chapter-10.1.2") | ||
); | ||
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alphanumericComparatorTestImpl( | ||
List.of("item_1_2_3", "item_2_1_3", "item_1_10_3", "item_2_2_1", "item_1_2_10", "item_2_1_10", "item_1_10_1"), | ||
List.of("item_1_2_3", "item_1_2_10", "item_1_10_1", "item_1_10_3", "item_2_1_3", "item_2_1_10", "item_2_2_1") | ||
); | ||
} | ||
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private void alphanumericComparatorTestImpl( | ||
@NotNull Collection<? extends CharSequence> input, | ||
@NotNull Collection<? extends CharSequence> expected | ||
) { | ||
final ArrayList<? extends CharSequence> sorted = new ArrayList<>(input); | ||
sorted.sort(AlphanumericComparator.getInstance()); | ||
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Assertions.assertEquals(expected, sorted); | ||
} | ||
} |