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/*
* 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.index.query;
import org.apache.lucene.index.LeafReaderContext;
import org.apache.lucene.search.IndexSearcher;
import org.apache.lucene.search.Query;
import org.apache.lucene.search.RandomAccessWeight;
import org.apache.lucene.search.Weight;
import org.apache.lucene.util.Bits;
import org.elasticsearch.client.Client;
import org.elasticsearch.common.io.stream.StreamInput;
import org.elasticsearch.common.io.stream.StreamOutput;
import org.elasticsearch.common.xcontent.XContentBuilder;
import org.elasticsearch.script.LeafSearchScript;
import org.elasticsearch.script.Script;
import org.elasticsearch.script.Script.ScriptField;
import org.elasticsearch.script.ScriptContext;
import org.elasticsearch.script.ScriptEngineService;
import org.elasticsearch.script.ScriptService;
import org.elasticsearch.script.SearchScript;
import org.elasticsearch.search.lookup.SearchLookup;
import java.io.IOException;
import java.util.Collections;
import java.util.Objects;
public class ScriptQueryBuilder extends AbstractQueryBuilder<ScriptQueryBuilder> {
public static final String NAME = "script";
static final ScriptQueryBuilder PROTOTYPE = new ScriptQueryBuilder(new Script(""));
private final Script script;
public ScriptQueryBuilder(Script script) {
if (script == null) {
throw new IllegalArgumentException("script cannot be null");
}
this.script = script;
}
public Script script() {
return this.script;
}
@Override
public String getWriteableName() {
return NAME;
}
@Override
protected void doXContent(XContentBuilder builder, Params builderParams) throws IOException {
builder.startObject(NAME);
builder.field(ScriptField.SCRIPT.getPreferredName(), script);
printBoostAndQueryName(builder);
builder.endObject();
}
@Override
protected Query doToQuery(QueryShardContext context) throws IOException {
return new ScriptQuery(script, context.getScriptService(), context.lookup());
}
static class ScriptQuery extends Query {
private final Script script;
private final SearchScript searchScript;
public ScriptQuery(Script script, ScriptService scriptService, SearchLookup searchLookup) {
this.script = script;
this.searchScript = scriptService.search(searchLookup, script, ScriptContext.Standard.SEARCH, Collections.emptyMap());
}
@Override
public String toString(String field) {
StringBuilder buffer = new StringBuilder();
buffer.append("ScriptFilter(");
buffer.append(script);
buffer.append(")");
return buffer.toString();
}
@Override
public boolean equals(Object obj) {
if (this == obj)
return true;
if (!super.equals(obj))
return false;
ScriptQuery other = (ScriptQuery) obj;
return Objects.equals(script, other.script);
}
@Override
public int hashCode() {
return Objects.hash(super.hashCode(), script);
}
@Override
public Weight createWeight(IndexSearcher searcher, boolean needsScores) throws IOException {
return new RandomAccessWeight(this) {
@Override
protected Bits getMatchingDocs(final LeafReaderContext context) throws IOException {
final LeafSearchScript leafScript = searchScript.getLeafSearchScript(context);
return new Bits() {
@Override
public boolean get(int doc) {
leafScript.setDocument(doc);
Object val = leafScript.run();
if (val == null) {
return false;
}
if (val instanceof Boolean) {
return (Boolean) val;
}
if (val instanceof Number) {
return ((Number) val).longValue() != 0;
}
throw new IllegalArgumentException("Can't handle type [" + val + "] in script filter");
}
@Override
public int length() {
return context.reader().maxDoc();
}
};
}
};
}
}
@Override
protected ScriptQueryBuilder doReadFrom(StreamInput in) throws IOException {
return new ScriptQueryBuilder(Script.readScript(in));
}
@Override
protected void doWriteTo(StreamOutput out) throws IOException {
script.writeTo(out);
}
@Override
protected int doHashCode() {
return Objects.hash(script);
}
@Override
protected boolean doEquals(ScriptQueryBuilder other) {
return Objects.equals(script, other.script);
}
}
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