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This OSGi bundle wraps ${pkgArtifactId} ${pkgVersion} jar file.
/*
* 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.script.expression;
import org.apache.lucene.expressions.Bindings;
import org.apache.lucene.expressions.Expression;
import org.apache.lucene.expressions.SimpleBindings;
import org.apache.lucene.index.AtomicReaderContext;
import org.apache.lucene.queries.function.FunctionValues;
import org.apache.lucene.queries.function.ValueSource;
import org.apache.lucene.search.Scorer;
import org.elasticsearch.script.SearchScript;
import java.io.IOException;
import java.util.Collections;
import java.util.Map;
/**
* A bridge to evaluate an {@link Expression} against {@link Bindings} in the context
* of a {@link SearchScript}.
*/
class ExpressionScript implements SearchScript {
final Expression expression;
final SimpleBindings bindings;
final ValueSource source;
final ReplaceableConstValueSource specialValue; // _value
Map context;
Scorer scorer;
FunctionValues values;
int docid;
ExpressionScript(Expression e, SimpleBindings b, ReplaceableConstValueSource v) {
expression = e;
bindings = b;
context = Collections.EMPTY_MAP;
source = expression.getValueSource(bindings);
specialValue = v;
}
double evaluate() {
return values.doubleVal(docid);
}
@Override
public Object run() { return new Double(evaluate()); }
@Override
public float runAsFloat() { return (float)evaluate();}
@Override
public long runAsLong() { return (long)evaluate(); }
@Override
public double runAsDouble() { return evaluate(); }
@Override
public Object unwrap(Object value) { return value; }
@Override
public void setNextDocId(int d) {
docid = d;
}
@Override
public void setNextReader(AtomicReaderContext leaf) {
try {
values = source.getValues(context, leaf);
} catch (IOException e) {
throw new ExpressionScriptExecutionException("Expression failed to bind for segment", e);
}
}
@Override
public void setScorer(Scorer s) {
scorer = s;
context = Collections.singletonMap("scorer", scorer);
}
@Override
public void setNextSource(Map source) {
// noop: expressions don't use source data
}
@Override
public void setNextVar(String name, Object value) {
assert(specialValue != null);
// this should only be used for the special "_value" variable used in aggregations
assert(name.equals("_value"));
if (value instanceof Number) {
specialValue.setValue(((Number)value).doubleValue());
} else {
throw new ExpressionScriptExecutionException("Cannot use expression with text variable");
}
}
}