org.eclipse.rdf4j.sail.lucene

Class SearchFields

java.lang.Object

org.eclipse.rdf4j.sail.lucene.SearchFields

public final class SearchFields
extends Object

Field Summary

Fields

Modifier and Type	Field and Description
static String	BNODE_ID_PREFIX String used to prefix BNode IDs with so that we can distinguish BNode fields from URI fields in Documents.
static String	CONTEXT_FIELD_NAME The name of the Document field holding the context identifer(s).
static String	CONTEXT_NULL the null context
static Pattern	HIGHLIGHTER_PATTERN
static String	HIGHLIGHTER_POST_TAG
static String	HIGHLIGHTER_PRE_TAG
static String	ID_FIELD_NAME The name of the Document field holding the document identifier.
static String	TEXT_FIELD_NAME The name of the Document field that holds multiple text values of a Resource.
static String	URI_FIELD_NAME The name of the Document field holding the Resource identifier.

Method Summary

Modifier and Type	Method and Description
static Resource	createContext(String idString)
static Resource	createResource(String idString) Parses an id-string (a serialized resource) back to a resource Inverse method of getResourceID(Resource)
static Literal	distanceToLiteral(double d)
static String	formIdString(String resourceId, String contextId)
static String	getContextID(Resource resource) Get the ID for a context.
static String	getLiteralPropertyValueAsString(Statement statement)
static String	getPropertyField(IRI property)
static String	getResourceID(Resource resource) Returns the String ID corresponding with the specified Resource.
static String	getSnippet(String highlightedValue)
static boolean	isPropertyField(String fieldName) Determines whether the specified field name is a property field name.
static Literal	scoreToLiteral(float score) Returns a score value encoded as a Literal.
static Literal	wktToLiteral(String wkt)

Methods inherited from class java.lang.Object

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

Field Detail

ID_FIELD_NAME

public static final String ID_FIELD_NAME

The name of the Document field holding the document identifier. This consists of the Resource identifier (URI or BNodeID) and the Context ID (the format is "resourceId|contextId")

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Constant Field Values

URI_FIELD_NAME

public static final String URI_FIELD_NAME

The name of the Document field holding the Resource identifier. The value stored in this field is either a URI or a BNode ID.

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Constant Field Values

TEXT_FIELD_NAME

public static final String TEXT_FIELD_NAME

The name of the Document field that holds multiple text values of a Resource. The field is called "text", as it contains all text, but was called "ALL" during the discussion. For each statement-literal of the resource, the object literal is stored in a field using the predicate-literal and additionally in a TEXT_FIELD_NAME-literal field.

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Constant Field Values

CONTEXT_FIELD_NAME

public static final String CONTEXT_FIELD_NAME

The name of the Document field holding the context identifer(s).

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Constant Field Values

CONTEXT_NULL

public static final String CONTEXT_NULL

the null context

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Constant Field Values

BNODE_ID_PREFIX

public static final String BNODE_ID_PREFIX

String used to prefix BNode IDs with so that we can distinguish BNode fields from URI fields in Documents. The prefix is chosen so that it is invalid as a (part of a) URI scheme.

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Constant Field Values

HIGHLIGHTER_PRE_TAG

public static final String HIGHLIGHTER_PRE_TAG

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Constant Field Values

HIGHLIGHTER_POST_TAG

public static final String HIGHLIGHTER_POST_TAG

See Also:

Constant Field Values

HIGHLIGHTER_PATTERN

public static final Pattern HIGHLIGHTER_PATTERN

Method Detail

getResourceID

public static String getResourceID(Resource resource)

Returns the String ID corresponding with the specified Resource. The id string is either the URI or a bnode prefixed with a "!".

getContextID

public static String getContextID(Resource resource)

Get the ID for a context. Context can be null, then the "null" string is returned

Parameters:

resource - the context

Returns:

a string

createResource

public static Resource createResource(String idString)

Parses an id-string (a serialized resource) back to a resource Inverse method of getResourceID(Resource)

Parameters:

idString -

Returns:

resource

createContext

public static Resource createContext(String idString)

getLiteralPropertyValueAsString

public static String getLiteralPropertyValueAsString(Statement statement)

getPropertyField

public static String getPropertyField(IRI property)

isPropertyField

public static boolean isPropertyField(String fieldName)

Determines whether the specified field name is a property field name.

formIdString

public static String formIdString(String resourceId,
                                  String contextId)

scoreToLiteral

public static Literal scoreToLiteral(float score)

Returns a score value encoded as a Literal.

Parameters:

score - the float score to convert

Returns:

the score as a literal

wktToLiteral

public static Literal wktToLiteral(String wkt)

distanceToLiteral

public static Literal distanceToLiteral(double d)

getSnippet

public static String getSnippet(String highlightedValue)