From 2109d4b99e0a9e7c5fd275f7a2064606f37e85e4 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?J=C3=A9r=C3=B4me=20Euzenat?= <Jerome.Euzenat@inria.fr>
Date: Mon, 22 May 2006 20:44:56 +0000
Subject: [PATCH] - Implemented the core of the QueryMediator (not tested but
roughly finished)
---
.../exmo/align/service/QueryMediator.java | 162 ++++++++++++++++--
1 file changed, 145 insertions(+), 17 deletions(-)
diff --git a/src/fr/inrialpes/exmo/align/service/QueryMediator.java b/src/fr/inrialpes/exmo/align/service/QueryMediator.java
index b2f716a8..9036ed04 100644
--- a/src/fr/inrialpes/exmo/align/service/QueryMediator.java
+++ b/src/fr/inrialpes/exmo/align/service/QueryMediator.java
@@ -1,3 +1,23 @@
+/*
+ * $Id: ParserPrinter.java 210 2006-02-17 12:09:31Z euzenat $
+ *
+ * Copyright (C) 2006 INRIA Rhône-Alpes.
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU Lesser General Public License
+ * as published by the Free Software Foundation; either version 2.1
+ * of the License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Lesser General Public License for more details.
+ *
+ * You should have received a copy of the GNU Lesser General Public License
+ * along with this program; if not, write to the Free Software
+ * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
+ */
+
/*
* QueryMediator.java
*
@@ -7,37 +27,138 @@
package fr.inrialpes.exmo.align.service;
-import fr.inrialpes.exmo.queryprocessor.impl.QueryProcessorImpl;
+// JE: I commented this in order to have it not tied to a
+// processor implementation
+//import fr.inrialpes.exmo.queryprocessor.impl.QueryProcessorImpl;
+import fr.inrialpes.exmo.queryprocessor.QueryProcessor;
+import fr.inrialpes.exmo.queryprocessor.Result;
+import fr.inrialpes.exmo.queryprocessor.Type;
+
+import fr.inrialpes.exmo.align.parser.AlignmentParser;
+
+import org.semanticweb.owl.align.AlignmentException;
import org.semanticweb.owl.align.Alignment;
+import org.semanticweb.owl.align.Cell;
+
+import org.semanticweb.owl.model.OWLEntity;
+import org.semanticweb.owl.model.OWLException;
+
+import org.xml.sax.SAXException;
+
+import javax.xml.parsers.ParserConfigurationException;
+
+import java.util.Enumeration;
+import java.util.Hashtable;
+import java.io.IOException;
/**
- *
+ * QueryMediator
+ *
+ * A query processor that mediates queries through an ontology alignment.
+ * This implementation rely on an embedded QueryProcessor.
+ * Another possible implementation would be to subclass a query processor.
+ * This would however provide few benefits (speed gained by no indirection)
+ * against loss in generality.
+ *
* @author Arun Sharma
*/
-public class QueryMediator extends QueryProcessorImpl {
+public class QueryMediator implements QueryProcessor {
private String query;
private Alignment alignment;
+ private QueryProcessor processor;
- public QueryMediator(String aQuery) {
- query = aQuery;
- }
+ // May be usefull to prohibit this...
+ //public QueryMediator( ) {
+ //}
- public QueryMediator(Alignment a, String aQuery) {
- query = aQuery;
+ public QueryMediator( QueryProcessor proc, Alignment a ) {
+ processor = proc;
alignment = a;
}
+ public QueryMediator( QueryProcessor proc, String alignmentURI ) throws SAXException,ParserConfigurationException,IOException {
+ processor = proc;
+ AlignmentParser aparser = new AlignmentParser(0);
+ alignment = aparser.parse( alignmentURI, new Hashtable() );
+ }
+
+ public QueryMediator( Alignment a ) {
+ // For this to work we need to generate a processor
+ this( (QueryProcessor)null, a );
+ }
+
+ public QueryMediator( String alignmentURI ) throws SAXException,ParserConfigurationException,IOException {
+ // For this to work we need to generate a processor
+ this( (QueryProcessor)null, alignmentURI );
+ }
+
+ /**
+ * @param query -- The query string
+ * @param type -- The query type, can be one of SELECT, ASK, CONSTRUCT, or DESCRIBE
+ * @returns Result, result form depends on type
+ */
+ // JE: There is a flaw in the query API: it should be defined with
+ // throws QueryException because if something fails, this will be
+ // done silently. (same for the other).
+ public Result query(String query, Type type) {
+ try {
+ String newQuery = rewriteQuery( query );
+ return processor.query( newQuery, type );
+ } catch (AlignmentException e) { return (Result)null; }
+ }
+
+ /**
+ *@param query -- The query string
+ */
+ public Result query(String query) {
+ try {
+ String newQuery = rewriteQuery( query );
+ return processor.query( newQuery );
+ } catch (AlignmentException e) { return (Result)null; }
+ }
+
+ /**
+ *@param query -- The query string
+ *@returns query results as string
+ */
+ public String queryWithStringResults(String query) {
+ try {
+ String newQuery = rewriteQuery( query );
+ return processor.queryWithStringResults( newQuery );
+ } catch (AlignmentException e) { return (String)null; }
+ }
+
+ /**
+ *@param query -- the query string
+ *@returns the type of the query
+ */
+ public int getType(String query){
+ return processor.getType( query );
+ }
+
+ public void loadOntology(String uri){
+ processor.loadOntology( uri );
+ }
+
/**
* @aQuery query to be re-written
- * @ a Alignment
- * @ return -- rewritten query, Current code just replaces all the prefix namespaces, if present, in the query by actual IRIs
- * TODO: rewrite the mainQuery variable (which is currently returned) to a query based on the given alignment
+ * @ a the alignment used for rewriting the query Alignment
+ * @ return -- rewritten query:
+ * - replaces all the prefix namespaces, if present, in the query by actual IRIs
+ * - replaces all entity IRI by their counterpart in the ontology
+ *
+ * Caveats:
+ * - This does only work for alignments with =
+ * - This does not care for the *:x status of alignments
+ * - This does work from ontology1 to ontology2, not the otherway round
+ * (use invert() in this case).
*/
- public String rewriteQuery(String aQuery, Alignment a) {
+ public String rewriteQuery( String aQuery ) throws AlignmentException {
+ // The first part expands the prefixes of the query
aQuery = aQuery.toLowerCase();
String mainQuery = "";
- if(aQuery.contains("prefix")) {
+ if( aQuery.indexOf("prefix") != -1 ) {
String[] pref = aQuery.split("prefix");
for(int j =0; j < pref.length; j++) {
String str = "";
@@ -58,10 +179,17 @@ public class QueryMediator extends QueryProcessorImpl {
mainQuery = mainQuery.replaceAll(ns, iri);
}
}
- }
-
- else
- mainQuery = aQuery;
+ } else mainQuery = aQuery;
+ // The second part replaces the named items by their counterparts
+ for( Enumeration e = alignment.getElements() ; e.hasMoreElements(); ){
+ Cell cell = (Cell)e.nextElement();
+ try {
+ mainQuery = mainQuery.replaceAll(
+ ((OWLEntity)cell.getObject1()).getURI().toString(),
+ ((OWLEntity)cell.getObject2()).getURI().toString() );
+ } catch ( OWLException ex) { throw new AlignmentException( "getURI problem", ex ); }
+
+ }
return mainQuery;
}
--
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