Examples of org.apache.lucene.facet.taxonomy.CategoryPath.longHashCode()

Package org.apache.lucene.facet.taxonomy

Class org.apache.lucene.facet.taxonomy.CategoryPath

Examples of org.apache.lucene.facet.taxonomy.CategoryPath.longHashCode()

org.apache.lucene.facet.taxonomy.CategoryPath.longHashCode()
Calculate a 64-bit hash function for this path. Unlike {@link #hashCode()}, this method is not part of the Java standard, and is only used if explicitly called by the user.
If two objects are equal(), their hash codes need to be equal, so like in {@link #equals(Object)}, longHashCode does not consider unused portions of the internal buffers in its calculation.
The hash function used is a simple multiplicative hash function, with the multiplier 65599. While Java's standard multiplier 31 (used in {@link #hashCode()}) gives a good distribution for ASCII strings, it turns out that for foreign-language strings (with 16-bit characters) it gives too many collisions, and a bigger multiplier produces fewer collisions in this case.

    // Being of the same length is obviously not enough to be equal
    p1.clear();
    p1.add("hi");
    p2.clear();
    p2.add("hello");
    assertEquals(false, p1.longHashCode(-1)==p2.longHashCode(-1));
    p1.clear();
    p1.add("hi");
    p2.clear();
    p2.add("ho");
    assertEquals(false, p1.longHashCode(-1)==p2.longHashCode(-1));

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    assertEquals(false, p1.longHashCode(-1)==p2.longHashCode(-1));
    p1.clear();
    p1.add("hi");
    p2.clear();
    p2.add("ho");
    assertEquals(false, p1.longHashCode(-1)==p2.longHashCode(-1));
    
    // Now move to testing prefixes:
    CategoryPath p = new CategoryPath();
    p.add("this");
    p.add("is");

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    CategoryPath p = new CategoryPath();
    p.add("this");
    p.add("is");
    p.add("a");
    p.add("test");
    assertEquals(p.longHashCode(), p.longHashCode(4));
    assertEquals(new CategoryPath().longHashCode(), p.longHashCode(0));
    assertEquals(new CategoryPath(p, 1).longHashCode(), p.longHashCode(1));
    assertEquals(new CategoryPath(p, 2).longHashCode(), p.longHashCode(2));
    assertEquals(new CategoryPath(p, 3).longHashCode(), p.longHashCode(3));
  }

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    CategoryPath p = new CategoryPath();
    p.add("this");
    p.add("is");
    p.add("a");
    p.add("test");
    assertEquals(p.longHashCode(), p.longHashCode(4));
    assertEquals(new CategoryPath().longHashCode(), p.longHashCode(0));
    assertEquals(new CategoryPath(p, 1).longHashCode(), p.longHashCode(1));
    assertEquals(new CategoryPath(p, 2).longHashCode(), p.longHashCode(2));
    assertEquals(new CategoryPath(p, 3).longHashCode(), p.longHashCode(3));
  }

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    p.add("this");
    p.add("is");
    p.add("a");
    p.add("test");
    assertEquals(p.longHashCode(), p.longHashCode(4));
    assertEquals(new CategoryPath().longHashCode(), p.longHashCode(0));
    assertEquals(new CategoryPath(p, 1).longHashCode(), p.longHashCode(1));
    assertEquals(new CategoryPath(p, 2).longHashCode(), p.longHashCode(2));
    assertEquals(new CategoryPath(p, 3).longHashCode(), p.longHashCode(3));
  }

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    p.add("is");
    p.add("a");
    p.add("test");
    assertEquals(p.longHashCode(), p.longHashCode(4));
    assertEquals(new CategoryPath().longHashCode(), p.longHashCode(0));
    assertEquals(new CategoryPath(p, 1).longHashCode(), p.longHashCode(1));
    assertEquals(new CategoryPath(p, 2).longHashCode(), p.longHashCode(2));
    assertEquals(new CategoryPath(p, 3).longHashCode(), p.longHashCode(3));
  }
  
  @Test

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    p.add("a");
    p.add("test");
    assertEquals(p.longHashCode(), p.longHashCode(4));
    assertEquals(new CategoryPath().longHashCode(), p.longHashCode(0));
    assertEquals(new CategoryPath(p, 1).longHashCode(), p.longHashCode(1));
    assertEquals(new CategoryPath(p, 2).longHashCode(), p.longHashCode(2));
    assertEquals(new CategoryPath(p, 3).longHashCode(), p.longHashCode(3));
  }
  
  @Test 
  public void testArrayConstructor() {

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    p.add("test");
    assertEquals(p.longHashCode(), p.longHashCode(4));
    assertEquals(new CategoryPath().longHashCode(), p.longHashCode(0));
    assertEquals(new CategoryPath(p, 1).longHashCode(), p.longHashCode(1));
    assertEquals(new CategoryPath(p, 2).longHashCode(), p.longHashCode(2));
    assertEquals(new CategoryPath(p, 3).longHashCode(), p.longHashCode(3));
  }
  
  @Test 
  public void testArrayConstructor() {
    CategoryPath p = new CategoryPath("hello", "world", "yo");

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