org.apache.struts2.tiles.StrutsAttributeEvaluator Maven / Gradle / Ivy
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* 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
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package org.apache.struts2.tiles;
import com.opensymphony.xwork2.ActionContext;
import com.opensymphony.xwork2.config.ConfigurationException;
import com.opensymphony.xwork2.ognl.OgnlUtil;
import ognl.OgnlException;
import org.apache.logging.log4j.LogManager;
import org.apache.logging.log4j.Logger;
import org.apache.struts2.ServletActionContext;
import org.apache.tiles.evaluator.AbstractAttributeEvaluator;
import org.apache.tiles.evaluator.EvaluationException;
import org.apache.tiles.request.Request;
import org.apache.tiles.request.servlet.ServletUtil;
import javax.servlet.http.HttpServletRequest;
public class StrutsAttributeEvaluator extends AbstractAttributeEvaluator {
private static final Logger LOG = LogManager.getLogger(StrutsAttributeEvaluator.class);
@Override
public Object evaluate(String expression, Request request) {
try {
HttpServletRequest httpRequest = ServletUtil.getServletRequest(request).getRequest();
ActionContext ctx = ServletActionContext.getActionContext(httpRequest);
if (ctx == null) {
LOG.error("Cannot obtain HttpServletRequest from [{}]", request.getClass().getName());
throw new ConfigurationException("There is no ActionContext for current request!");
}
OgnlUtil ognlUtil = ctx.getContainer().getInstance(OgnlUtil.class);
LOG.debug("Trying evaluate expression [{}] using OgnlUtil's getValue", expression);
Object result = ognlUtil.getValue(expression, ctx.getContextMap(), ctx.getValueStack().getRoot());
LOG.debug("Final result of evaluating expression [{}] is: {}", expression, result);
return result;
} catch (OgnlException e) {
throw new EvaluationException(e);
}
}
}