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/*
* Licensed to ElasticSearch and Shay Banon 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.search.facet.terms.strings;
import com.google.common.collect.ImmutableList;
import com.google.common.collect.ImmutableSet;
import gnu.trove.iterator.TObjectIntIterator;
import gnu.trove.map.hash.TObjectIntHashMap;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.search.Scorer;
import org.apache.lucene.util.BytesRef;
import org.elasticsearch.common.CacheRecycler;
import org.elasticsearch.common.collect.BoundedTreeSet;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.facet.FacetExecutor;
import org.elasticsearch.search.facet.InternalFacet;
import org.elasticsearch.search.facet.terms.support.EntryPriorityQueue;
import org.elasticsearch.search.internal.SearchContext;
import java.io.IOException;
import java.util.Arrays;
import java.util.Map;
import java.util.regex.Matcher;
import java.util.regex.Pattern;
/**
*
*/
public class ScriptTermsStringFieldFacetExecutor extends FacetExecutor {
private final InternalStringTermsFacet.ComparatorType comparatorType;
private final int size;
private final SearchScript script;
private final Matcher matcher;
private final ImmutableSet excluded;
private final int numberOfShards;
final TObjectIntHashMap facets;
long missing;
long total;
public ScriptTermsStringFieldFacetExecutor(int size, InternalStringTermsFacet.ComparatorType comparatorType, SearchContext context,
ImmutableSet excluded, Pattern pattern, String scriptLang, String script, Map params) {
this.size = size;
this.comparatorType = comparatorType;
this.numberOfShards = context.numberOfShards();
this.script = context.scriptService().search(context.lookup(), scriptLang, script, params);
this.excluded = excluded;
this.matcher = pattern != null ? pattern.matcher("") : null;
this.facets = CacheRecycler.popObjectIntMap();
}
@Override
public Collector collector() {
return new Collector(matcher, excluded, script, facets);
}
@Override
public InternalFacet buildFacet(String facetName) {
if (facets.isEmpty()) {
CacheRecycler.pushObjectIntMap(facets);
return new InternalStringTermsFacet(facetName, comparatorType, size, ImmutableList.of(), missing, total);
} else {
if (size < EntryPriorityQueue.LIMIT) {
EntryPriorityQueue ordered = new EntryPriorityQueue(size, comparatorType.comparator());
for (TObjectIntIterator it = facets.iterator(); it.hasNext(); ) {
it.advance();
ordered.insertWithOverflow(new InternalStringTermsFacet.TermEntry(it.key(), it.value()));
}
InternalStringTermsFacet.TermEntry[] list = new InternalStringTermsFacet.TermEntry[ordered.size()];
for (int i = ordered.size() - 1; i >= 0; i--) {
list[i] = ((InternalStringTermsFacet.TermEntry) ordered.pop());
}
CacheRecycler.pushObjectIntMap(facets);
return new InternalStringTermsFacet(facetName, comparatorType, size, Arrays.asList(list), missing, total);
} else {
BoundedTreeSet ordered = new BoundedTreeSet(comparatorType.comparator(), size);
for (TObjectIntIterator it = facets.iterator(); it.hasNext(); ) {
it.advance();
ordered.add(new InternalStringTermsFacet.TermEntry(it.key(), it.value()));
}
CacheRecycler.pushObjectIntMap(facets);
return new InternalStringTermsFacet(facetName, comparatorType, size, ordered, missing, total);
}
}
}
class Collector extends FacetExecutor.Collector {
private final Matcher matcher;
private final ImmutableSet excluded;
private final SearchScript script;
private final TObjectIntHashMap facets;
long missing;
long total;
Collector(Matcher matcher, ImmutableSet excluded, SearchScript script, TObjectIntHashMap facets) {
this.matcher = matcher;
this.excluded = excluded;
this.script = script;
this.facets = facets;
}
@Override
public void setScorer(Scorer scorer) throws IOException {
script.setScorer(scorer);
}
@Override
public void setNextReader(AtomicReaderContext context) throws IOException {
script.setNextReader(context);
}
@Override
public void collect(int doc) throws IOException {
script.setNextDocId(doc);
Object o = script.run();
if (o == null) {
missing++;
return;
}
if (o instanceof Iterable) {
boolean found = false;
for (Object o1 : ((Iterable) o)) {
String value = o1.toString();
if (match(value)) {
found = true;
// LUCENE 4 UPGRADE: should be possible to convert directly to BR
facets.adjustOrPutValue(new BytesRef(value), 1, 1);
total++;
}
}
if (!found) {
missing++;
}
} else if (o instanceof Object[]) {
boolean found = false;
for (Object o1 : ((Object[]) o)) {
String value = o1.toString();
if (match(value)) {
found = true;
// LUCENE 4 UPGRADE: should be possible to convert directly to BR
facets.adjustOrPutValue(new BytesRef(value), 1, 1);
total++;
}
}
if (!found) {
missing++;
}
} else {
String value = o.toString();
if (match(value)) {
// LUCENE 4 UPGRADE: should be possible to convert directly to BR
facets.adjustOrPutValue(new BytesRef(value), 1, 1);
total++;
} else {
missing++;
}
}
}
@Override
public void postCollection() {
ScriptTermsStringFieldFacetExecutor.this.missing = missing;
ScriptTermsStringFieldFacetExecutor.this.total = total;
}
private boolean match(String value) {
if (excluded != null && excluded.contains(new BytesRef(value))) {
return false;
}
if (matcher != null && !matcher.reset(value).matches()) {
return false;
}
return true;
}
}
}
