com.espertech.esper.event.xml.DOMSimpleAttributeGetter Maven / Gradle / Ivy

Go to download

Show more of this group Show more artifacts with this name
Show all versions of esper Show documentation

Complex event processing and event series analysis component

There is a newer version: 7.1.0

/*
 * *************************************************************************************
 *  Copyright (C) 2006-2015 EsperTech, Inc. All rights reserved.                       *
 *  http://www.espertech.com/esper                                                     *
 *  http://www.espertech.com                                                           *
 *  ---------------------------------------------------------------------------------- *
 *  The software in this package is published under the terms of the GPL license       *
 *  a copy of which has been included with this distribution in the license.txt file.  *
 * *************************************************************************************
 */

package com.espertech.esper.event.xml;

import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventPropertyGetter;
import com.espertech.esper.client.PropertyAccessException;
import org.w3c.dom.Node;
import org.w3c.dom.NamedNodeMap;

/**
 * Getter for simple attributes in a DOM node.
 */
public class DOMSimpleAttributeGetter implements EventPropertyGetter, DOMPropertyGetter
{
    private final String propertyName;

    /**
     * Ctor.
     * @param propertyName property name
     */
    public DOMSimpleAttributeGetter(String propertyName)
    {
        this.propertyName = propertyName;
    }

    public Object getValueAsFragment(Node node)
    {
        return null;
    }

    public Node[] getValueAsNodeArray(Node node)
    {
        return null;
    }

    public Node getValueAsNode(Node node)
    {
        NamedNodeMap namedNodeMap = node.getAttributes();
        for (int i = 0; i < namedNodeMap.getLength(); i++)
        {
            Node attrNode = namedNodeMap.item(i);
            if (attrNode.getLocalName() != null)
            {
                if (propertyName.equals(attrNode.getLocalName()))
                {
                    return attrNode;
                }
                continue;
            }
            if (propertyName.equals(attrNode.getNodeName()))
            {
                return attrNode;
            }
        }
        return null;
    }

    public Object get(EventBean obj) throws PropertyAccessException
    {
        // The underlying is expected to be a map
        if (!(obj.getUnderlying() instanceof Node))
        {
            throw new PropertyAccessException("Mismatched property getter to event bean type, " +
                    "the underlying data object is not of type Node");
        }

        Node node = (Node) obj.getUnderlying();
        return getValueAsNode(node);
    }

    public boolean isExistsProperty(EventBean eventBean)
    {
        return true;
    }

    public Object getFragment(EventBean eventBean) throws PropertyAccessException
    {
        return null;  // Never a fragment
    }
}