Document (Lucene 3.6.2 API)

java.lang.Object
- org.apache.lucene.document.Document

All Implemented Interfaces:

Serializable
```
public final class Document
extends Object
implements Serializable
```
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, Searcher.doc(int) or IndexReader.document(int).

See Also:
Serialized Form

Constructor Summary

Constructors
Constructor and Description

Document()
Constructs a new document with no fields.

Constructors
Constructor and Description
`Document()` Constructs a new document with no fields.

Method Summary

Methods
Modifier and Type	Method and Description
`void`	`add(Fieldable field)` Adds a field to a document.
`String`	`get(String name)` Returns the string value of the field with the given name if any exist in this document, or null.
`byte[]`	`getBinaryValue(String name)` Returns an array of bytes for the first (or only) field that has the name specified as the method parameter.
`byte[][]`	`getBinaryValues(String name)` Returns an array of byte arrays for of the fields that have the name specified as the method parameter.
`float`	`getBoost()` Returns, at indexing time, the boost factor as set by `setBoost(float)`.
`Field`	`getField(String name)` Deprecated. use `getFieldable(java.lang.String)` instead and cast depending on data type.
`Fieldable`	`getFieldable(String name)` Returns a field with the given name if any exist in this document, or null.
`Fieldable[]`	`getFieldables(String name)` Returns an array of `Fieldable`s with the given name.
`List<Fieldable>`	`getFields()` Returns a List of all the fields in a document.
`Field[]`	`getFields(String name)` Deprecated. use `getFieldable(java.lang.String)` instead and cast depending on data type.
`String[]`	`getValues(String name)` Returns an array of values of the field specified as the method parameter.
`void`	`removeField(String name)` Removes field with the specified name from the document.
`void`	`removeFields(String name)` Removes all fields with the given name from the document.
`void`	`setBoost(float boost)` Sets a boost factor for hits on any field of this document.
`String`	`toString()` Prints the fields of a document for human consumption.

Methods inherited from class java.lang.Object
clone, equals, finalize, getClass, hashCode, notify, notifyAll, wait, wait, wait

- Constructor Detail
  - Document
```
public Document()
```
    Constructs a new document with no fields.
- Method Detail
  - setBoost
```
public void setBoost(float boost)
```
    Sets a boost factor for hits on any field of this document. This value will be multiplied into the score of all hits on this document.
    The default value is 1.0.
    Values are multiplied into the value of Fieldable.getBoost() of each field in this document. Thus, this method in effect sets a default boost for the fields of this document.
    
    See Also:
    Fieldable.setBoost(float)
  - getBoost
```
public float getBoost()
```
    Returns, at indexing time, the boost factor as set by setBoost(float).
    Note that once a document is indexed this value is no longer available from the index. At search time, for retrieved documents, this method always returns 1. This however does not mean that the boost value set at indexing time was ignored - it was just combined with other indexing time factors and stored elsewhere, for better indexing and search performance. (For more information see the "norm(t,d)" part of the scoring formula in Similarity.)
    
    See Also:
    setBoost(float)
  - add
```
public final void add(Fieldable 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.
  - getField
```
@Deprecated
public final Field getField(String name)
```
    Deprecated. use getFieldable(java.lang.String) instead and cast depending on data type.
    
    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. Do not use this method with lazy loaded fields or NumericField.
    
    Throws:
    
    ClassCastException - if you try to retrieve a numerical or lazy loaded field.
  - getFieldable
```
public Fieldable getFieldable(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.
  - 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 NumericField it returns the string value of the number. If you want the actual NumericField instance back, use getFieldable(java.lang.String).
  - getFields
```
public final List<Fieldable> getFields()
```
    Returns a List of all the fields in a document.
    Note that fields which are not stored are not available in documents retrieved from the index, e.g. Searcher.doc(int) or IndexReader.document(int).
  - getFields
```
@Deprecated
public final Field[] getFields(String name)
```
    Deprecated. use getFieldable(java.lang.String) instead and cast depending on data type.
    
    Returns an array of Fields with the given name. This method returns an empty array when there are no matching fields. It never returns null. Do not use this method with lazy loaded fields or NumericField.
    
    Parameters:
    name - the name of the field
    
    Returns:
    a Field[] array
    
    Throws:
    
    ClassCastException - if you try to retrieve a numerical or lazy loaded field.
  - getFieldables
```
public Fieldable[] getFieldables(String name)
```
    Returns an array of Fieldables 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 Fieldable[] 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 NumericFields it returns the string value of the number. If you want the actual NumericField instances back, use getFieldables(java.lang.String).
    
    Parameters:
    name - the name of the field
    
    Returns:
    a String[] of field values
  - getBinaryValues
```
public final byte[][] 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 byte[][] of binary field values
  - getBinaryValue
```
public final byte[] 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 byte[] containing the binary field value or null
  - toString
```
public final String toString()
```
    Prints the fields of a document for human consumption.
    
    Overrides:
    
    toString in class Object

Class Document

Constructor Summary

Method Summary

Methods inherited from class java.lang.Object

Constructor Detail

Document

Method Detail

setBoost

getBoost

add

removeField

removeFields

getField

getFieldable

get

getFields

getFields

getFieldables

getValues

getBinaryValues

getBinaryValue

toString