org.elasticsearch.common.lucene.search.OrFilter Maven / Gradle / Ivy
/*
* Licensed to Elasticsearch under one or more contributor
* license agreements. See the NOTICE file distributed with
* this work for additional information regarding copyright
* ownership. Elasticsearch licenses this file to you under
* the Apache License, Version 2.0 (the "License"); you may
* not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.elasticsearch.common.lucene.search;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.DocIdSet;
import org.apache.lucene.search.Filter;
import org.apache.lucene.util.Bits;
import org.elasticsearch.common.lucene.docset.DocIdSets;
import org.elasticsearch.common.lucene.docset.OrDocIdSet;
import java.io.IOException;
import java.util.ArrayList;
import java.util.List;
/**
*
*/
public class OrFilter extends Filter {
private final List filters;
public OrFilter(List filters) {
this.filters = filters;
}
public List filters() {
return filters;
}
@Override
public DocIdSet getDocIdSet(AtomicReaderContext context, Bits acceptDocs) throws IOException {
if (filters.size() == 1) {
return filters.get(0).getDocIdSet(context, acceptDocs);
}
List sets = new ArrayList(filters.size());
for (int i = 0; i < filters.size(); i++) {
DocIdSet set = filters.get(i).getDocIdSet(context, acceptDocs);
if (DocIdSets.isEmpty(set)) { // none matching for this filter, continue
continue;
}
sets.add(set);
}
if (sets.size() == 0) {
return null;
}
if (sets.size() == 1) {
return sets.get(0);
}
return new OrDocIdSet(sets.toArray(new DocIdSet[sets.size()]));
}
@Override
public int hashCode() {
int hash = 7;
hash = 31 * hash + (null == filters ? 0 : filters.hashCode());
return hash;
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if ((obj == null) || (obj.getClass() != this.getClass()))
return false;
OrFilter other = (OrFilter) obj;
return equalFilters(filters, other.filters);
}
@Override
public String toString() {
StringBuilder builder = new StringBuilder();
for (Filter filter : filters) {
if (builder.length() > 0) {
builder.append(' ');
}
builder.append(filter);
}
return builder.toString();
}
private boolean equalFilters(List filters1, List filters2) {
return (filters1 == filters2) || ((filters1 != null) && filters1.equals(filters2));
}
}