net.solarnetwork.node.hw.currentcost.CCMessageParser.java Source code

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Here is the source code for net.solarnetwork.node.hw.currentcost.CCMessageParser.java

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/* ==================================================================
 * CCMessageParser.java - Apr 26, 2013 8:57:13 AM
 * 
 * Copyright 2007-2013 SolarNetwork.net Dev Team
 * 
 * This program is free software; you can redistribute it and/or 
 * modify it under the terms of the GNU General Public License as 
 * published by the Free Software Foundation; either version 2 of 
 * the License, or (at your option) any later version.
 * 
 * This program is distributed in the hope that it will be useful, 
 * but WITHOUT ANY WARRANTY; without even the implied warranty of 
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU 
 * General Public License for more details.
 * 
 * You should have received a copy of the GNU General Public License 
 * along with this program; if not, write to the Free Software 
 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 
 * 02111-1307 USA
 * ==================================================================
 */

package net.solarnetwork.node.hw.currentcost;

import java.io.ByteArrayInputStream;
import java.io.UnsupportedEncodingException;
import java.util.HashMap;
import java.util.Map;
import javax.xml.xpath.XPathExpression;
import net.solarnetwork.node.support.XmlServiceSupport;
import net.solarnetwork.util.JodaDateFormatEditor;
import net.solarnetwork.util.JodaDateFormatEditor.ParseMode;
import org.joda.time.LocalTime;
import org.springframework.beans.BeanWrapper;

/**
 * Helper class that can parse Current Cost XML messages into {@link CCDatum}
 * instances.
 * 
 * <p>
 * This parser supports both <b>Classic</b> and <b>CC128</b> message formats.
 * </p>
 * 
 * @author matt
 * @version 1.1
 */
public class CCMessageParser extends XmlServiceSupport {

    private static JodaDateFormatEditor LOCAL_TIME_EDITOR = new JodaDateFormatEditor("HH:mm:ss",
            ParseMode.LocalTime);

    private final Map<String, XPathExpression> xpathMapping;

    public CCMessageParser() {
        super();
        init();
        Map<String, String> mapping = new HashMap<String, String>();
        mapping.put("deviceAddress", "(/msg/src/id|/msg/id)[1]");
        mapping.put("deviceName", "(/msg/src/name|/msg/src[count(child::*) = 0])[1]");
        mapping.put("deviceType", "(/msg/src/type|/msg/type[count(child::*) = 0])[1]");
        mapping.put("deviceSoftwareVersion", "/msg/src/sver");
        mapping.put("daysSinceBegin", "(/msg/date/dsb|/msg/dsb)[1]");
        mapping.put("localTime", "concat(/msg/date/hr, ':', /msg/date/min, ':', /msg/date/sec, /msg/time)");
        mapping.put("channel1Watts", "/msg/ch1/watts");
        mapping.put("channel2Watts", "/msg/ch2/watts");
        mapping.put("channel3Watts", "/msg/ch3/watts");
        mapping.put("temperature", "/msg/tmpr");
        xpathMapping = getXPathExpressionMap(mapping);
    }

    /**
     * Parse a CurrentCost XML message into a CCDatum object.
     * 
     * @param messageXML
     *        the message bytes to parse
     * @return the CCDatum instance, or <em>null</em> if any parsing error
     *         occurs
     */
    public CCDatum parseMessage(byte[] messageXML) {
        CCDatum d = new CCDatum();
        if (log.isDebugEnabled()) {
            try {
                log.debug("Parsing CC XML: {}", new String(messageXML, "UTF-8"));
            } catch (UnsupportedEncodingException e) {
                // shouldn't get here
            }
        }
        try {
            extractBeanDataFromXml(d,
                    getDocBuilderFactory().newDocumentBuilder().parse(new ByteArrayInputStream(messageXML)),
                    xpathMapping);
        } catch (Exception e) {
            try {
                log.debug("XML parsing exception: {}; message: {}", e.getMessage(),
                        new String(messageXML, "US-ASCII"));
            } catch (UnsupportedEncodingException e1) {
                log.debug("XML parsing exception: {}", e.getMessage());
            }
            return null;
        }
        return d;
    }

    @Override
    protected void registerCustomEditors(BeanWrapper bean) {
        bean.registerCustomEditor(LocalTime.class, LOCAL_TIME_EDITOR);
    }

}