org.apache.lucene.document

Class Document

  • All Implemented Interfaces:
    Iterable<IndexableField>


    public final class Document
    extends Object
    implements Iterable<IndexableField>
    Documents are the unit of indexing and search. A Document is a set of fields. Each field has a name and a textual value. A field may be stored with the document, in which case it is returned with search hits on the document. Thus each document should typically contain one or more stored fields which uniquely identify it.

    Note that fields which are not stored are not available in documents retrieved from the index, e.g. with ScoreDoc.doc or IndexReader.document(int).

    • Constructor Detail

      • Document

        public Document()
        Constructs a new document with no fields.
    • Method Detail

      • add

        public final void add(IndexableField field)

        Adds a field to a document. Several fields may be added with the same name. In this case, if the fields are indexed, their text is treated as though appended for the purposes of search.

        Note that add like the removeField(s) methods only makes sense prior to adding a document to an index. These methods cannot be used to change the content of an existing index! In order to achieve this, a document has to be deleted from an index and a new changed version of that document has to be added.

      • removeField

        public final void removeField(String name)

        Removes field with the specified name from the document. If multiple fields exist with this name, this method removes the first field that has been added. If there is no field with the specified name, the document remains unchanged.

        Note that the removeField(s) methods like the add method only make sense prior to adding a document to an index. These methods cannot be used to change the content of an existing index! In order to achieve this, a document has to be deleted from an index and a new changed version of that document has to be added.

      • removeFields

        public final void removeFields(String name)

        Removes all fields with the given name from the document. If there is no field with the specified name, the document remains unchanged.

        Note that the removeField(s) methods like the add method only make sense prior to adding a document to an index. These methods cannot be used to change the content of an existing index! In order to achieve this, a document has to be deleted from an index and a new changed version of that document has to be added.

      • getBinaryValues

        public final BytesRef[] getBinaryValues(String name)
        Returns an array of byte arrays for of the fields that have the name specified as the method parameter. This method returns an empty array when there are no matching fields. It never returns null.
        Parameters:
        name - the name of the field
        Returns:
        a BytesRef[] of binary field values
      • getBinaryValue

        public final BytesRef getBinaryValue(String name)
        Returns an array of bytes for the first (or only) field that has the name specified as the method parameter. This method will return null if no binary fields with the specified name are available. There may be non-binary fields with the same name.
        Parameters:
        name - the name of the field.
        Returns:
        a BytesRef containing the binary field value or null
      • getField

        public final IndexableField getField(String name)
        Returns a field with the given name if any exist in this document, or null. If multiple fields exists with this name, this method returns the first value added.
      • getFields

        public IndexableField[] getFields(String name)
        Returns an array of IndexableFields with the given name. This method returns an empty array when there are no matching fields. It never returns null.
        Parameters:
        name - the name of the field
        Returns:
        a Field[] array
      • getValues

        public final String[] getValues(String name)
        Returns an array of values of the field specified as the method parameter. This method returns an empty array when there are no matching fields. It never returns null. For a numeric StoredField it returns the string value of the number. If you want the actual numeric field instances back, use getFields(java.lang.String).
        Parameters:
        name - the name of the field
        Returns:
        a String[] of field values
      • get

        public final String get(String name)
        Returns the string value of the field with the given name if any exist in this document, or null. If multiple fields exist with this name, this method returns the first value added. If only binary fields with this name exist, returns null. For a numeric StoredField it returns the string value of the number. If you want the actual numeric field instance back, use getField(java.lang.String).
      • clear

        public void clear()
        Removes all the fields from document.