/**
* This software is licensed to you under the Apache License, Version 2.0 (the
* "Apache License").
*
* LinkedIn's contributions are made under the Apache License. If you contribute
* to the Software, the contributions will be deemed to have been made under the
* Apache License, unless you expressly indicate otherwise. Please do not make any
* contributions that would be inconsistent with the Apache License.
*
* You may obtain a copy of the Apache License at http://www.apache.org/licenses/LICENSE-2.0
* Unless required by applicable law or agreed to in writing, this software
* distributed under the Apache License is distributed on an "AS IS" BASIS, WITHOUT
* WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the Apache
* License for the specific language governing permissions and limitations for the
* software governed under the Apache License.
*
* © 2012 LinkedIn Corp. All Rights Reserved.
*/
package com.senseidb.search.query.filters;
import java.io.IOException;
import java.util.*;
import com.browseengine.bobo.facets.filter.RandomAccessFilter;
import org.apache.lucene.index.IndexReader;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.json.JSONObject;
import com.browseengine.bobo.api.BoboIndexReader;
import com.browseengine.bobo.api.BrowseSelection;
import com.browseengine.bobo.api.BrowseSelection.ValueOperation;
import com.browseengine.bobo.facets.FacetHandler;
import com.kamikaze.docidset.impl.AndDocIdSet;
import com.senseidb.util.RequestConverter2;
public class FacetSelectionFilterConstructor extends FilterConstructor{
public static final String FILTER_TYPE = "selection";
public static BrowseSelection buildFacetSelection(String name,JSONObject json) throws Exception{
BrowseSelection sel = new BrowseSelection(name);
String[] vals = RequestConverter2.getStrings(json.optJSONArray(VALUES_PARAM));
String[] nots = RequestConverter2.getStrings(json.optJSONArray(EXCLUDES_PARAM));
sel.setValues(vals);
sel.setNotValues(nots);
String op = json.optString(OPERATOR_PARAM,OR_PARAM);
if (OR_PARAM.equalsIgnoreCase(op)){
sel.setSelectionOperation(ValueOperation.ValueOperationOr);
}
else{
sel.setSelectionOperation(ValueOperation.ValueOperationAnd);
}
JSONObject paramsObj = json.optJSONObject(PARAMS_PARAM);
if (paramsObj!=null){
Map<String,String> paramMap = convertParams(paramsObj);
if (paramMap!=null && paramMap.size()>0){
sel.setSelectionProperties(paramMap);
}
}
return sel;
}
@Override
protected SenseiFilter doConstructFilter(Object obj) throws Exception {
final JSONObject json = (JSONObject)obj;
return new SenseiFilter(){
@Override
public SenseiDocIdSet getSenseiDocIdSet(IndexReader reader) throws IOException {
if (reader instanceof BoboIndexReader){
BoboIndexReader boboReader = (BoboIndexReader)reader;
Iterator<String> iter = json.keys();
List<SenseiFilter> senseiFilters = new ArrayList<SenseiFilter>();
while(iter.hasNext()){
String key = iter.next();
FacetHandler facetHandler = boboReader.getFacetHandler(key);
if (facetHandler!=null){
try{
JSONObject jsonObj = json.getJSONObject(key);
BrowseSelection sel = buildFacetSelection(key, jsonObj);
senseiFilters.add(SenseiFilter.build(facetHandler.buildFilter(sel), "FACET " + key));
}
catch(Exception e){
throw new IOException(e.getMessage());
}
}
else{
throw new IOException(key+" is not defined as a facet handler");
}
}
if(senseiFilters.isEmpty()) {
return null;
} else {
return new SenseiAndFilter(senseiFilters).getSenseiDocIdSet(reader);
}
}
else{
throw new IllegalStateException("reader not instance of "+BoboIndexReader.class);
}
}
};
}
}