org.dlese.dpc.index.reader

Class DocReader

java.lang.Object

org.dlese.dpc.index.reader.DocReader

Direct Known Subclasses:

FileIndexingServiceDocReader, HarvestLogReader, SimpleDocReader, WebLogReader

public abstract class DocReader
extends java.lang.Object

An abstract bean for accessing the data stored in the Lucene Documents that are returned from a search. All concrete DocReader classes must implement a default no-argument constructor so that they may be created automatically by the factory ResultDoc.getDocReader(). In addition, the index writer corresponding to the concrete reader must implement the DocWriter.getReaderClass() method.

Author:

John Weatherley

See Also:

SimpleLuceneIndex, ResultDoc

Field Summary

Fields

Modifier and Type	Field and Description
protected ResultDocConfig	conf The index that was searched over.
protected org.apache.lucene.document.Document	doc The Lucene Document that is being read.
protected ResultDoc	resultDoc
protected float	score The Lucene score assigned to the Document, or -1 if none available.

Constructor Summary

Constructors

Modifier	Constructor and Description
protected	DocReader() Constructor that initializes an empty DocReader.
protected	DocReader(org.apache.lucene.document.Document myDoc) Constructor that may be used programatically to wrap a reader around a Lucene Document that was created by a DocWriter.

Method Summary

Modifier and Type	Method and Description
void	doInit(org.apache.lucene.document.Document myDoc, ResultDoc resultDoc, float myScore, ResultDocConfig myConf) Called by ResultDoc at search time to initialize a new instance of a DocReader.
java.lang.Object	getAttribute(java.lang.String key) Gets an attribute that has been previously set using SimpleLuceneIndex.setAttribute(String,Object).
DocumentMap	getDocMap() Gets a DocumentMap of all field/values contained in the Lucene Document.
org.apache.lucene.document.Document	getDocument() Gets the Lucene Document associated with this DocReader.
SimpleLuceneIndex	getIndex() Gets the index that was searched over to produce the resulting hit.
LazyDocumentMap	getLazyDocMap() Gets a LazyDocumentMap of all field/values contained in the Lucene Document.
java.lang.String	getQuery() Gets the query that was used in the search.
abstract java.lang.String	getReaderType() Gets a String describing the reader type.
RepositoryManager	getRepositoryManager() Gets the RepositoryManager associated with this DocReader or null if not available.
java.lang.String	getScore() Gets the Lucene score for the Document, or -1 if none available.
abstract void	init() An init method that may be used by concrete classes to initialize variables and resources as needed.
protected void	setDoc(org.apache.lucene.document.Document myDoc) Sets the Lucene Document that is being read by this DocReader.

Methods inherited from class java.lang.Object

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

Field Detail

doc

protected org.apache.lucene.document.Document doc

The Lucene Document that is being read.

score

protected float score

The Lucene score assigned to the Document, or -1 if none available.

conf

protected ResultDocConfig conf

The index that was searched over.

resultDoc

protected ResultDoc resultDoc

Constructor Detail

DocReader

protected DocReader(org.apache.lucene.document.Document myDoc)

Constructor that may be used programatically to wrap a reader around a Lucene Document that was created by a DocWriter.

Parameters:

myDoc - Gets the Lucene Document that is being read by this DocReader.

See Also:

DocWriter

DocReader

protected DocReader()

Constructor that initializes an empty DocReader.

Method Detail

getReaderType

public abstract java.lang.String getReaderType()

Gets a String describing the reader type. This may be used in (Struts) beans to determine which type of reader is available for a given search result and thus what data is available for display in the UI. The reader type implies which getter methods are available.

Returns:

The readerType value.

init

public abstract void init()

An init method that may be used by concrete classes to initialize variables and resources as needed.

doInit

public final void doInit(org.apache.lucene.document.Document myDoc,
                         ResultDoc resultDoc,
                         float myScore,
                         ResultDocConfig myConf)

Called by ResultDoc at search time to initialize a new instance of a DocReader.

Parameters:

myDoc - The Lucene Document

myScore - The Lucene score asigned to this hit

myConf - The config available to the doc reader

getDocMap

public DocumentMap getDocMap()

Gets a DocumentMap of all field/values contained in the Lucene Document. The text values in each field is stored in the Map as Strings. For example getDocMap.get("title") returns the text that was indexed and stored under the field name "title" for this Document.

Example that uses JSTL inside a JSP page (assumes result is an instance of ResultDoc):

The title is: ${result.docMap["title"]}

Returns:

A Map of all field/values contained in this Document, or null

See Also:

DocumentMap

getLazyDocMap

public LazyDocumentMap getLazyDocMap()

Gets a LazyDocumentMap of all field/values contained in the Lucene Document. The text values in each field is stored in the Map as Strings. For example getDocMap.get("title") returns the text that was indexed and stored under the field name "title" for this Document.

Example that uses JSTL inside a JSP page (assumes result is an instance of ResultDoc):

The title is: ${result.docMap["title"]}

Returns:

A Map of all field/values contained in this Document, or null

See Also:

DocumentMap

setDoc

protected void setDoc(org.apache.lucene.document.Document myDoc)

Sets the Lucene Document that is being read by this DocReader.

Parameters:

myDoc - The new doc value

getScore

public java.lang.String getScore()

Gets the Lucene score for the Document, or -1 if none available.

Returns:

The score or -1 if not available.

getDocument

public org.apache.lucene.document.Document getDocument()

Gets the Lucene Document associated with this DocReader.

Returns:

A Lucene Document.

getIndex

public SimpleLuceneIndex getIndex()

Gets the index that was searched over to produce the resulting hit.

Returns:

The index.

getAttribute

public java.lang.Object getAttribute(java.lang.String key)

Gets an attribute that has been previously set using SimpleLuceneIndex.setAttribute(String,Object).

Parameters:

key - The key for the attribute

Returns:

The attruibute, or null if none exists under the given key

See Also:

SimpleLuceneIndex.setAttribute(String,Object)

getRepositoryManager

public RepositoryManager getRepositoryManager()

Gets the RepositoryManager associated with this DocReader or null if not available. Assumes the RepositoryManager has been set as attribute 'repositoryManager' in the SimpleLuceneIndex that was searched.

Returns:

The repositoryManager value

getQuery

public java.lang.String getQuery()

Gets the query that was used in the search.

Returns:

The query value