org.jxls.expression.ExpressionEvaluatorFactoryJSR223Impl Maven / Gradle / Ivy

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package org.jxls.expression;

import javax.script.ScriptEngine;
import javax.script.ScriptEngineManager;

import org.jxls.util.JxlsHelper;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

/**
 * A factory to create {@link ExpressionEvaluator} instance which is based on JSR 223
 */
public final class ExpressionEvaluatorFactoryJSR223Impl implements ExpressionEvaluatorFactory {
    private static final Logger LOG = LoggerFactory.getLogger(ExpressionEvaluatorFactoryJSR223Impl.class);
    private final ScriptEngineManager manager = new ScriptEngineManager();
    private ScriptEngine scriptEngine;

    public ExpressionEvaluatorFactoryJSR223Impl() {
        final String lang = JxlsHelper.getProperty("jxls.script_engine", "jexl");
        LOG.info("jxls.script_engine:{}", lang);
        scriptEngine = manager.getEngineByName(lang.trim());
    }

    @Override
    public ExpressionEvaluator createExpressionEvaluator(final String expression) {
        return new ExpressionEvaluator4JSR223Impl(scriptEngine, expression);
    }
}