/*
* DBeaver - Universal Database Manager
* Copyright (C) 2010-2017 Serge Rider (serge@jkiss.org)
*
* 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.
*/
package org.jkiss.dbeaver.model.sql.eval;
import org.apache.commons.jexl2.Expression;
import org.apache.commons.jexl2.JexlEngine;
import org.jkiss.dbeaver.DBException;
import org.jkiss.dbeaver.model.sql.SQLScriptContext;
/**
* ScriptVariablesContext
*/
public class ScriptEvaluateEngine {
private final SQLScriptContext scriptContext;
private final JexlEngine jexlEngine;
private final ScriptVariablesContext variablesContext;
private ScriptEvaluateEngine(SQLScriptContext scriptContext) {
this.scriptContext = scriptContext;
jexlEngine = new JexlEngine(null, null, null, null);
jexlEngine.setCache(100);
variablesContext = new ScriptVariablesContext(scriptContext);
}
public Object evaluateExpression(String exprString) throws DBException {
try {
Expression expression = jexlEngine.createExpression(exprString);
return expression.evaluate(variablesContext);
} catch (Exception e) {
throw new DBException("Error evaluating expression [" + exprString + "]", e);
}
}
public static ScriptEvaluateEngine getEngine(SQLScriptContext scriptContext) {
ScriptEvaluateEngine engine = (ScriptEvaluateEngine) scriptContext.getData("evalEngine");
if (engine == null) {
engine = new ScriptEvaluateEngine(scriptContext);
scriptContext.setData("evalEngine", engine);
}
return engine;
}
}