/*
*
* * Copyright 2014 Orient Technologies LTD (info(at)orientechnologies.com)
* *
* * Licensed 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.
* *
* * For more information: http://www.orientechnologies.com
*
*/
package com.orientechnologies.orient.core.sql.functions.math;
import com.orientechnologies.orient.core.command.OCommandContext;
import com.orientechnologies.orient.core.db.record.OIdentifiable;
import com.orientechnologies.orient.core.record.impl.ODocument;
import com.orientechnologies.orient.core.sql.filter.OSQLPredicate;
import java.util.List;
/**
* Evaluates a complex expression.
*
* @author Luca Garulli (l.garulli--at--orientechnologies.com)
*
*/
public class OSQLFunctionEval extends OSQLFunctionMathAbstract {
public static final String NAME = "eval";
private OSQLPredicate predicate;
public OSQLFunctionEval() {
super(NAME, 1, 1);
}
public Object execute(Object iThis, final OIdentifiable iRecord, final Object iCurrentResult, final Object[] iParams,
OCommandContext iContext) {
if (predicate == null)
predicate = new OSQLPredicate((String) iParams[0].toString());
final ODocument currentResult = iCurrentResult instanceof ODocument ? (ODocument) iCurrentResult : null;
try {
return predicate.evaluate(iRecord != null ? iRecord.getRecord() : null, currentResult, iContext);
} catch (ArithmeticException e) {
// DIVISION BY 0
return 0;
} catch (Exception e) {
return null;
}
}
public boolean aggregateResults() {
return false;
}
public String getSyntax() {
return "eval(<expression>)";
}
@Override
public Object getResult() {
return null;
}
@Override
public Object mergeDistributedResult(List<Object> resultsToMerge) {
return null;
}
}