Constructor Detail

• GraphQuery

  public GraphQuery(Query q,
                    String fromField,
                    String toField)

  Create a graph query q - the starting node query fromField - the field containing the node id toField - the field containing the edge ids

• GraphQuery

  public GraphQuery(Query q,
                    String fromField,
                    String toField,
                    Query traversalFilter)

  Create a graph query with a traversal filter applied while traversing the frontier. q - the starting node query fromField - the field containing the node id toField - the field containing the edge ids traversalFilter - the filter to be applied on each iteration of the frontier.

Method Detail

• createWeight

  public Weight createWeight(IndexSearcher searcher,
                             boolean needsScores)
                      throws IOException

  Description copied from class: Query
  Expert: Constructs an appropriate Weight implementation for this query.

  Only implemented by primitive queries, which re-write to themselves.

  Overrides:

  createWeight in class Query

  needsScores - True if document scores (Scorer.score()) or match frequencies (Scorer.freq()) are needed.

  Throws:

  IOException

• toString

  public String toString(String field)

  Description copied from class: Query
  Prints a query to a string, with field assumed to be the default field and omitted.

  Specified by:

  toString in class Query

• getTraversalFilter

  public Query getTraversalFilter()

  Returns:

  The query to be used as a filter for each hop in the graph.

• setTraversalFilter

  public void setTraversalFilter(Query traversalFilter)

• getQ

  public Query getQ()

• setQ

  public void setQ(Query q)

• getFromField

  public String getFromField()

  Returns:

  The field that contains the node id

• setFromField

  public void setFromField(String fromField)

• getToField

  public String getToField()

  Returns:

  the field that contains the edge id(s)

• setToField

  public void setToField(String toField)

• getMaxDepth

  public int getMaxDepth()

  Returns:

  Max depth for traversal, -1 for infinite!

• setMaxDepth

  public void setMaxDepth(int maxDepth)

• isUseAutn

  public boolean isUseAutn()

  Returns:

  If true , an automaton query will be compiled for each new frontier traversal this helps to avoid max boolean clause errors.

• setUseAutn

  public void setUseAutn(boolean useAutn)

• isOnlyLeafNodes

  public boolean isOnlyLeafNodes()

  Returns:

  if true only documents that do not have a value in the edge id field will be returned.

• setOnlyLeafNodes

  public void setOnlyLeafNodes(boolean onlyLeafNodes)

• isReturnRoot

  public boolean isReturnRoot()

  Returns:

  if true the documents that matched the rootNodes query will be returned. o/w they will be removed from the result set.

• setReturnRoot

  public void setReturnRoot(boolean returnRoot)

• hashCode

  public int hashCode()

  Description copied from class: Query
  Override and implement query hash code properly in a subclass. This is required so that QueryCache works properly.

  Specified by:

  hashCode in class Query

  See Also:

  Query.equals(Object)

• equals

  public boolean equals(Object other)

  Description copied from class: Query
  Override and implement query instance equivalence properly in a subclass. This is required so that QueryCache works properly. Typically a query will be equal to another only if it's an instance of the same class and its document-filtering properties are identical that other instance. Utility methods are provided for certain repetitive code.

  Specified by:

  equals in class Query

  See Also:

  Query.sameClassAs(Object), Query.classHash()