LuceneUtils

com.google.appengine.api.search.dev

Class LuceneUtils

• java.lang.Object
• • com.google.appengine.api.search.dev.LuceneUtils

• ---

  
  

  public final class LuceneUtils
  extends java.lang.Object

  Various utilities to interface with Lucene.

• • Field Summary

    Fields 

    Modifier and Type	Field and Description
    static java.lang.String	FIELDLESS_FIELD_NAME The name of the field under which we store tokens for all fields, so that we can search for them without a field prefix.
    static long	MSEC_PER_DAY

  • Constructor Summary

    Constructors 

    Constructor and Description
    LuceneUtils()

  • Method Summary

    All Methods Static Methods Concrete Methods 

    Modifier and Type	Method and Description
    static java.lang.Long	dateStringToLong(java.lang.String value)
    static java.lang.String	extractTextFromHtml(java.lang.String html)
    static Query	getMatchAnyDocumentQuery()
    static Query	getMatchNoneQuery()
    static boolean	isDateString(java.lang.String value) Checks whether provided string is an ISO-8601 date.
    static java.lang.Object	luceneFieldToValue(Fieldable f, ContentType type)
    static java.lang.String	makeLuceneFieldName(DocumentPb.Field field)
    static java.lang.String	makeLuceneFieldName(java.lang.String name, DocumentPb.FieldValue.ContentType type)
    static java.lang.String	makeLuceneFieldNameWithExtractedText(DocumentPb.Field field)
    static java.lang.String	makeLuceneFieldNameWithExtractedText(java.lang.String name, DocumentPb.FieldValue.ContentType type)
    static Term	newDeleteTerm(java.lang.String docId)
    static double	numericFieldToDouble(Fieldable f)
    static double	stringValueToDouble(java.lang.String value) Locale-aware Double parsing.
    static DocumentPb.Document	toAppengineDocument(Document d)
    static DocumentPb.Document	toAppengineDocumentId(Document d)
    static Document	toLuceneDocument(java.lang.String docId, DocumentPb.Document input)
    static java.util.List<AbstractField>	toLuceneFields(DocumentPb.Field field)

    • Methods inherited from class java.lang.Object

      clone, equals, finalize, getClass, hashCode, notify, notifyAll, toString, wait, wait, wait

• • Field Detail

    • FIELDLESS_FIELD_NAME

      public static final java.lang.String FIELDLESS_FIELD_NAME

      The name of the field under which we store tokens for all fields, so that we can search for them without a field prefix.

      See Also:

      Constant Field Values

    • MSEC_PER_DAY

      public static final long MSEC_PER_DAY

      See Also:

      Constant Field Values

  • Constructor Detail

    • LuceneUtils

      public LuceneUtils()

  • Method Detail

    • makeLuceneFieldName

      public static java.lang.String makeLuceneFieldName(DocumentPb.Field field)

    • makeLuceneFieldName

      public static java.lang.String makeLuceneFieldName(java.lang.String name,
                                                         DocumentPb.FieldValue.ContentType type)

    • makeLuceneFieldNameWithExtractedText

      public static java.lang.String makeLuceneFieldNameWithExtractedText(java.lang.String name,
                                                                          DocumentPb.FieldValue.ContentType type)

    • makeLuceneFieldNameWithExtractedText

      public static java.lang.String makeLuceneFieldNameWithExtractedText(DocumentPb.Field field)

    • extractTextFromHtml

      public static java.lang.String extractTextFromHtml(java.lang.String html)

    • stringValueToDouble

      public static double stringValueToDouble(java.lang.String value)

      Locale-aware Double parsing. Double.valueOf(String) fails if your locale uses commas as decimal separators. This takes that into account.

    • toLuceneFields

      public static java.util.List<AbstractField> toLuceneFields(DocumentPb.Field field)

    • toLuceneDocument

      public static Document toLuceneDocument(java.lang.String docId,
                                              DocumentPb.Document input)

    • dateStringToLong

      public static java.lang.Long dateStringToLong(java.lang.String value)
                                             throws java.text.ParseException

      Throws:

      java.text.ParseException

    • isDateString

      public static boolean isDateString(java.lang.String value)

      Checks whether provided string is an ISO-8601 date.

    • numericFieldToDouble

      public static double numericFieldToDouble(Fieldable f)

    • luceneFieldToValue

      public static java.lang.Object luceneFieldToValue(Fieldable f,
                                                        ContentType type)

    • toAppengineDocumentId

      public static DocumentPb.Document toAppengineDocumentId(Document d)

    • toAppengineDocument

      public static DocumentPb.Document toAppengineDocument(Document d)
                                                     throws InvalidProtocolBufferException

      Throws:

      InvalidProtocolBufferException

    • getMatchAnyDocumentQuery

      public static Query getMatchAnyDocumentQuery()

    • getMatchNoneQuery

      public static Query getMatchNoneQuery()

    • newDeleteTerm

      public static Term newDeleteTerm(java.lang.String docId)