net.sf.oval.expression.ExpressionLanguageOGNLImpl Maven / Gradle / Ivy

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/*******************************************************************************
 * Portions created by Sebastian Thomschke are copyright (c) 2005-2015 Sebastian
 * Thomschke.
 *
 * All Rights Reserved. This program and the accompanying materials
 * are made available under the terms of the Eclipse Public License v1.0
 * which accompanies this distribution, and is available at
 * http://www.eclipse.org/legal/epl-v10.html
 *
 * Contributors:
 *     Sebastian Thomschke - initial implementation.
 *******************************************************************************/
package net.sf.oval.expression;

import java.util.Map;
import java.util.Map.Entry;

import net.sf.oval.exception.ExpressionEvaluationException;
import net.sf.oval.internal.Log;
import net.sf.oval.internal.util.ObjectCache;
import ognl.Ognl;
import ognl.OgnlContext;
import ognl.OgnlException;

/**
 * @author Sebastian Thomschke
 *
 */
public class ExpressionLanguageOGNLImpl extends AbstractExpressionLanguage
{
	private static final Log LOG = Log.getLog(ExpressionLanguageOGNLImpl.class);

	private final ObjectCache expressionCache = new ObjectCache();

	public Object evaluate(final String expression, final Map values) throws ExpressionEvaluationException
	{
		LOG.debug("Evaluating OGNL expression: {1}", expression);
		try
		{
			final OgnlContext ctx = (OgnlContext) Ognl.createDefaultContext(null);

			for (final Entry entry : values.entrySet())
			{
				ctx.put(entry.getKey(), entry.getValue());
			}

			Object expr = expressionCache.get(expression);
			if (expr == null)
			{
				expr = Ognl.parseExpression(expression);
				expressionCache.put(expression, expr);
			}
			return Ognl.getValue(expr, ctx);
		}
		catch (final OgnlException ex)
		{
			throw new ExpressionEvaluationException("Evaluating MVEL expression failed: " + expression, ex);
		}
	}
}