calculatefilter.java

来自「java pos,你可以直接编译运行,」· Java 代码 · 共 144 行

/*
 * Copyright (c) 2000 jPOS.org.  All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 *
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions and the following disclaimer.
 *
 * 2. Redistributions in binary form must reproduce the above copyright
 *    notice, this list of conditions and the following disclaimer in
 *    the documentation and/or other materials provided with the
 *    distribution.
 *
 * 3. The end-user documentation included with the redistribution,
 *    if any, must include the following acknowledgment:
 *    "This product includes software developed by the jPOS project
 *    (http://www.jpos.org/)". Alternately, this acknowledgment may
 *    appear in the software itself, if and wherever such third-party
 *    acknowledgments normally appear.
 *
 * 4. The names "jPOS" and "jPOS.org" must not be used to endorse
 *    or promote products derived from this software without prior
 *    written permission. For written permission, please contact
 *    [e-mail].
 *
 * 5. Products derived from this software may not be called "jPOS",
 *    nor may "jPOS" appear in their name, without prior written
 *    permission of the jPOS project.
 *
 * THIS SOFTWARE IS PROVIDED ``AS IS'' AND ANY EXPRESSED OR IMPLIED
 * WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE JPOS PROJECT OR ITS CONTRIBUTORS BE LIABLE FOR
 * ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
 * DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
 * OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
 * HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT,
 * STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING
 * IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 * ====================================================================
 *
 * This software consists of voluntary contributions made by many
 * individuals on behalf of the jPOS Project.  For more
 * information please see <http://www.jpos.org/>.
 */

package org.jpos.iso.filter;
import org.jpos.core.ConfigurationException;
import org.jpos.core.NodeConfigurable;
import org.jpos.iso.ISOChannel;
import org.jpos.iso.ISOException;
import org.jpos.iso.ISOFilter;
import org.jpos.iso.ISOMsg;
import org.jpos.util.JepUtil;
import org.jpos.util.LogEvent;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;

/**
 * Using JEP to compute expressions
 *
 * @author <a href="mailto:[e-mail]">Zhiyu Tang
 * @version $Revision: 1.3 $ $Date: 2003/10/13 11:04:19 $
 * @see org.jpos.iso.ISOFilter
 */
public class CalculateFilter
    implements ISOFilter,NodeConfigurable
{
    String condition[];
    String field[];
    String statement[];
    int condNum;
    JepUtil jeputil;

    public CalculateFilter () {
        super();
        condition = null;
        statement = null;
        field = null;
        condNum = 0;
        jeputil = new JepUtil();
    }


   public void setConfiguration (Node node)
        throws ConfigurationException
    {
        NodeList nodes = node.getChildNodes();
        condNum = nodes.getLength();
        int i, j = 0;
        for( i=0 ; i < condNum; i++ )
        {
            if (nodes.item(i).getNodeName().equals ("calculate"))
            j++;
        }

        condition = new String[j];
        field = new String[j];
        statement = new String[j];
        j = 0;
        for( i=0 ; i < condNum; i++ )
        {
            if (nodes.item(i).getNodeName().equals ("calculate")) {
                condition[j] = nodes.item(i).getAttributes().getNamedItem ("switch").getNodeValue();
                field[j] = nodes.item(i).getAttributes().getNamedItem ("field").getNodeValue();
                statement[j] = nodes.item(i).getAttributes().getNamedItem ("statement").getNodeValue();
                j++;
           }
        }
        condNum = j;
    }

   private void calculateStatement( LogEvent evt , ISOMsg m )
        throws ISOException
    {
        int i = 0;
        for( i = 0 ; i < condNum ; i++ )
        {

            if( jeputil.getResultBoolean( m , condition[i] ) )
             {
              String valueString = jeputil.getResult( m , statement[i] );
              evt.addMessage( "<calculate field=\""+field[i]+"\" value=\""+valueString+"\"/>" );
              m.set( Integer.valueOf( field[i]).intValue() , valueString );
             }
        }
    }

    public ISOMsg filter (ISOChannel channel, ISOMsg m, LogEvent evt)
        throws VetoException
    {
        try {
          calculateStatement( evt , m );
        } catch (ISOException e) {
           evt.addMessage (e);
          throw new VetoException (e);
        }
        return m;
    }
}