Examples of org.apache.lucene.document.LongField

org.apache.lucene.document.LongField
Field that indexes long values for efficient range filtering and sorting. Here's an example usage:
```
 document.add(new LongField(name, 6L, Field.Store.NO)); 
```
For optimal performance, re-use the LongField and {@link Document} instance for more than one document:
```
 LongField field = new LongField(name, 0L, Field.Store.NO); Document document = new Document(); document.add(field); for(all documents) { ... field.setLongValue(value) writer.addDocument(document); ... } 
```
See also {@link IntField}, {@link FloatField}, {@link DoubleField}. Any type that can be converted to long can also be indexed. For example, date/time values represented by a {@link java.util.Date} can be translated into a longvalue using the {@link java.util.Date#getTime} method. If youdon't need millisecond precision, you can quantize the value, either by dividing the result of {@link java.util.Date#getTime} or using the separate getters(for year, month, etc.) to construct an int or long value.

To perform range querying or filtering against a LongField, use {@link NumericRangeQuery} or {@link NumericRangeFilter}. To sort according to a LongField, use the normal numeric sort types, eg {@link org.apache.lucene.search.SortField.Type#LONG}. LongField values can also be loaded directly from {@link FieldCache}.

You may add the same field name as an LongField to the same document more than once. Range querying and filtering will be the logical OR of all values; so a range query will hit all documents that have at least one value in the range. However sort behavior is not defined. If you need to sort, you should separately index a single-valued LongField.

A LongField will consume somewhat more disk space in the index than an ordinary single-valued field. However, for a typical index that includes substantial textual content per document, this increase will likely be in the noise.

Within Lucene, each numeric value is indexed as a trie structure, where each term is logically assigned to larger and larger pre-defined brackets (which are simply lower-precision representations of the value). The step size between each successive bracket is called the precisionStep, measured in bits. Smaller precisionStep values result in larger number of brackets, which consumes more disk space in the index but may result in faster range search performance. The default value, 4, was selected for a reasonable tradeoff of disk space consumption versus performance. You can create a custom {@link FieldType} and invoke the {@link FieldType#setNumericPrecisionStep} method if you'dlike to change the value. Note that you must also specify a congruent value when creating {@link NumericRangeQuery} or {@link NumericRangeFilter}. For low cardinality fields larger precision steps are good. If the cardinality is < 100, it is fair to use {@link Integer#MAX_VALUE}, which produces one term per value.
For more information on the internals of numeric trie indexing, including the precisionStep configuration, see {@link NumericRangeQuery}. The format of indexed values is described in {@link NumericUtils}.
If you only need to sort by numeric value, and never run range querying/filtering, you can index using a precisionStep of {@link Integer#MAX_VALUE}. This will minimize disk space consumed.

More advanced users can instead use {@link NumericTokenStream} directly, when indexing numbers. Thisclass is a wrapper around this token stream type for easier, more intuitive usage.
@since 2.9

          sf = new StoredField("nf", i);
          typeAnswer = NumericType.INT;
        } else {
          final long l = random().nextLong();
          answer = Long.valueOf(l);
          nf = new LongField("nf", l, Field.Store.NO);
          sf = new StoredField("nf", l);
          typeAnswer = NumericType.LONG;
        }
      }
      doc.add(nf);

View Full Code Here

    final double d = random().nextDouble();


    List<Field> fields = Arrays.asList(
        new Field("bytes", bytes, ft),
        new Field("string", string, ft),
        new LongField("long", l, Store.YES),
        new IntField("int", i, Store.YES),
        new FloatField("float", f, Store.YES),
        new DoubleField("double", d, Store.YES)
    );

View Full Code Here

          // NumericRangeFilter).  This indexes to milli-second resolution, which
          // is often too fine.  You could instead create a number based on
          // year/month/day/hour/minutes/seconds, down the resolution you require.
          // For example the long value 2011021714 would mean
          // February 17, 2011, 2-3 PM.
          doc.add(new LongField("modified", file.lastModified(), Field.Store.NO));


          // Add the contents of the file to a field named "contents".  Specify a Reader,
          // so that the text of the file is tokenized and indexed, but not stored.
          // Note that FileReader expects the file to be in UTF-8 encoding.
          // If that's not the case searching for special characters will fail.

View Full Code Here

    for(int i=0;i<numDocs;i++ ){
      Document doc = new Document();
      long num = random().nextLong();
      minValue = Math.min(num, minValue);
      maxValue = Math.max(num, maxValue);
      doc.add(new LongField("field", num, Field.Store.NO));
      w.addDocument(doc);
    }
    
    IndexReader r = w.getReader();

View Full Code Here

    doc.add(new Field("utf8", "Lu\uD834\uDD1Ece\uD834\uDD60ne \u0000 \u2620 ab\ud917\udc17cd", customType2));
    doc.add(new Field("content2", "here is more content with aaa aaa aaa", customType2));
    doc.add(new Field("fie\u2C77ld", "field with non-ascii name", customType2));
    // add numeric fields, to test if flex preserves encoding
    doc.add(new IntField("trieInt", id, Field.Store.NO));
    doc.add(new LongField("trieLong", (long) id, Field.Store.NO));
    // add docvalues fields
    doc.add(new NumericDocValuesField("dvByte", (byte) id));
    byte bytes[] = new byte[] {
      (byte)(id >>> 24), (byte)(id >>> 16),(byte)(id >>> 8),(byte)id
    };

View Full Code Here

    doc.add(new Field("utf8", "Lu\uD834\uDD1Ece\uD834\uDD60ne \u0000 \u2620 ab\ud917\udc17cd", customType2));
    doc.add(new Field("content2", "here is more content with aaa aaa aaa", customType2));
    doc.add(new Field("fie\u2C77ld", "field with non-ascii name", customType2));
    // add numeric fields, to test if flex preserves encoding
    doc.add(new IntField("trieInt", id, Field.Store.NO));
    doc.add(new LongField("trieLong", (long) id, Field.Store.NO));
    // add docvalues fields
    doc.add(new NumericDocValuesField("dvByte", (byte) id));
    byte bytes[] = new byte[] {
      (byte)(id >>> 24), (byte)(id >>> 16),(byte)(id >>> 8),(byte)id
    };

View Full Code Here

    for (long l = 0; l < 100; l++) {
      Document doc = new Document();
      // For computing range facet counts:
      doc.add(new NumericDocValuesField("field", l));
      // For drill down by numeric range:
      doc.add(new LongField("field", l, Field.Store.NO));


      CategoryPath cp;
      if ((l&3) == 0) {
        cp = new CategoryPath("dim", "a");
      } else {

View Full Code Here

    for (long l = 0; l < 100; l++) {
      Document doc = new Document();
      // For computing range facet counts:
      doc.add(new NumericDocValuesField("field", l));
      // For drill down by numeric range:
      doc.add(new LongField("field", l, Field.Store.NO));


      CategoryPath cp;
      if ((l&3) == 0) {
        cp = new CategoryPath("dim", "a");
      } else {

View Full Code Here

    for(int i=0;i<numDocs;i++) {
      Document doc = new Document();
      long v = random().nextLong();
      values[i] = v;
      doc.add(new NumericDocValuesField("field", v));
      doc.add(new LongField("field", v, Field.Store.NO));
      w.addDocument(doc);
    }
    IndexReader r = w.getReader();
    w.close();

View Full Code Here

          sf = new StoredField("nf", i);
          typeAnswer = NumericType.INT;
        } else {
          final long l = random().nextLong();
          answer = Long.valueOf(l);
          nf = new LongField("nf", l, Field.Store.NO);
          sf = new StoredField("nf", l);
          typeAnswer = NumericType.LONG;
        }
      }
      doc.add(nf);

View Full Code Here

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