/**
* This file is part of Jahia, next-generation open source CMS:
* Jahia's next-generation, open source CMS stems from a widely acknowledged vision
* of enterprise application convergence - web, search, document, social and portal -
* unified by the simplicity of web content management.
*
* For more information, please visit http://www.jahia.com.
*
* Copyright (C) 2002-2011 Jahia Solutions Group SA. All rights reserved.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation; either version 2
* 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 General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.
*
* As a special exception to the terms and conditions of version 2.0 of
* the GPL (or any later version), you may redistribute this Program in connection
* with Free/Libre and Open Source Software ("FLOSS") applications as described
* in Jahia's FLOSS exception. You should have received a copy of the text
* describing the FLOSS exception, and it is also available here:
* http://www.jahia.com/license
*
* Commercial and Supported Versions of the program (dual licensing):
* alternatively, commercial and supported versions of the program may be used
* in accordance with the terms and conditions contained in a separate
* written agreement between you and Jahia Solutions Group SA.
*
* If you are unsure which license is appropriate for your use,
* please contact the sales department at sales@jahia.com.
*/
package org.jahia.services.query;
import org.apache.commons.lang.ArrayUtils;
import org.apache.jackrabbit.commons.iterator.NodeIteratorAdapter;
import org.apache.jackrabbit.commons.iterator.RowIteratorAdapter;
import javax.jcr.*;
import javax.jcr.query.QueryResult;
import javax.jcr.query.Row;
import javax.jcr.query.RowIterator;
import java.util.Collections;
import java.util.LinkedList;
import java.util.List;
/**
* This is an adapter to support JCR query result functionality for multiple providers.
*
* @author Thomas Draier
*/
class MultipleQueryResultAdapter implements QueryResult {
private static MultipleQueryResultAdapter EMPTY = new MultipleQueryResultAdapter();
private List<QueryResultWrapper> queryResults;
/**
* Decorates the provided list of query results, if needed.
* @param queryResults the query results to be wrapped
* @return decorated list of query results
*/
public static QueryResult decorate(List<QueryResultWrapper> queryResults) {
if (queryResults == null || queryResults.isEmpty()) {
return EMPTY;
} else if (queryResults.size() == 1) {
return queryResults.get(0);
} else {
return new MultipleQueryResultAdapter(queryResults);
}
}
/**
* Wrapped query results that comes from different store
*/
private MultipleQueryResultAdapter() {
super();
queryResults = Collections.emptyList();
}
/**
* Wrapped query results that comes from different store
*
* @param queryResults
*/
private MultipleQueryResultAdapter(List<QueryResultWrapper> queryResults) {
this.queryResults = queryResults;
}
public String[] getColumnNames() throws RepositoryException {
return !queryResults.isEmpty() ? queryResults.get(0).getColumnNames() : ArrayUtils.EMPTY_STRING_ARRAY;
}
public RowIterator getRows() throws RepositoryException {
RowIterator resultRowIterator = RowIteratorAdapter.EMPTY;
if (!queryResults.isEmpty()) {
List<Row> rows = new LinkedList<Row>();
// TODO implement a real row iterator on top of the query results without reading all the rows.
for (final QueryResultWrapper queryResult : queryResults) {
RowIterator subIterator = queryResult.getRows();
while (subIterator.hasNext()) {
rows.add(subIterator.nextRow());
}
}
resultRowIterator = new RowIteratorAdapter(rows);
}
return resultRowIterator;
}
public NodeIterator getNodes() throws RepositoryException {
NodeIterator nodeIterator = NodeIteratorAdapter.EMPTY;
if (!queryResults.isEmpty()) {
List<Node> nodes = new LinkedList<Node>();
// TODO implement a real node iterator on top of the query results without reading all the nodes.
for (QueryResult queryResult : queryResults) {
NodeIterator subIterator = queryResult.getNodes();
while (subIterator.hasNext()) {
nodes.add(subIterator.nextNode());
}
}
nodeIterator = new NodeIteratorAdapter(nodes);
}
return nodeIterator;
}
public String[] getSelectorNames() throws RepositoryException {
return !queryResults.isEmpty() ? queryResults.get(0).getSelectorNames() : ArrayUtils.EMPTY_STRING_ARRAY;
}
}