com.clican.pluto.dataprocess.engine.processes.MvelExecProcessor.java Source code

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Here is the source code for com.clican.pluto.dataprocess.engine.processes.MvelExecProcessor.java

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/**
 * The Clican-Pluto software suit is Copyright 2009, Clican Company and individual contributors, and is licensed under the GNU LGPL.
 *
 * @author clican
 *
 */
package com.clican.pluto.dataprocess.engine.processes;

import java.io.InputStream;
import java.util.HashMap;
import java.util.Map;

import org.apache.commons.lang.StringUtils;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import org.mvel2.MVEL;

import com.clican.pluto.dataprocess.engine.ProcessorContext;
import com.clican.pluto.dataprocess.engine.impl.BaseDataProcessor;
import com.clican.pluto.dataprocess.exception.DataProcessException;

/**
 * MVEL?
 * 
 * @author clican
 * 
 */
public class MvelExecProcessor extends BaseDataProcessor {

    private String mvelExpression;

    private Log logger = LogFactory.getLog(getClass());

    private String resultName;

    public void setMvelExpression(String mvelExpression) {
        this.mvelExpression = mvelExpression;
    }

    public void setResultName(String resultName) {
        this.resultName = resultName;
    }

    public void setMvelExpressionInputStream(InputStream mvelExpressionInputStream) {
        try {
            byte[] data = new byte[mvelExpressionInputStream.available()];
            mvelExpressionInputStream.read(data);
            mvelExpression = new String(data, "utf-8");
        } catch (Exception e) {
            throw new RuntimeException(e);
        } finally {
            if (mvelExpressionInputStream != null) {
                try {
                    mvelExpressionInputStream.close();
                } catch (Exception e) {
                    log.error("", e);
                }
            }
        }
    }

    public void process(ProcessorContext context) throws DataProcessException {
        long nanoSeconds = System.nanoTime();
        logger.trace("start processing mvel expression(" + this.getId() + ") ...");
        if (StringUtils.isEmpty(mvelExpression)) {
            throw new DataProcessException("The MVEL Expression cannt be null");
        }
        Map<String, Object> map = new HashMap<String, Object>();
        for (String attributeName : context.getAttributeNames()) {
            map.put(attributeName, context.getAttribute(attributeName));
        }
        map.put("context", context);
        Object obj = MVEL.eval(mvelExpression, map);
        if (StringUtils.isNotEmpty(resultName)) {
            context.setAttribute(resultName, obj);
        }
        logger.trace("end processing mvel expression(" + this.getId() + "), time consumed: "
                + (System.nanoTime() - nanoSeconds) / 1000000 + " ms");
    }

}

// $Id: MvelExecProcessor.java 13776 2010-06-01 12:00:58Z wei.zhang $