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.NodeList;
/**
* Getter for a DOM complex element.
*/
public class DOMComplexElementGetter implements EventPropertyGetter, DOMPropertyGetter
{
private final String propertyName;
private final FragmentFactory fragmentFactory;
private final boolean isArray;
/**
* Ctor.
* @param propertyName property name
* @param fragmentFactory for creating fragments
* @param isArray if this is an array property
*/
public DOMComplexElementGetter(String propertyName, FragmentFactory fragmentFactory, boolean isArray)
{
this.propertyName = propertyName;
this.fragmentFactory = fragmentFactory;
this.isArray = isArray;
}
public Object getValueAsFragment(Node node)
{
if (!isArray)
{
Node result = getValueAsNode(node);
if (result == null)
{
return result;
}
return fragmentFactory.getEvent(result);
}
else
{
Node[] result = getValueAsNodeArray(node);
if ((result == null) || (result.length == 0))
{
return new EventBean[0];
}
EventBean[] events = new EventBean[result.length];
int count = 0;
for (int i = 0; i < result.length; i++)
{
events[count++] = fragmentFactory.getEvent(result[i]);
}
return events;
}
}
public Node getValueAsNode(Node node)
{
NodeList list = node.getChildNodes();
for (int i = 0; i < list.getLength(); i++)
{
Node childNode = list.item(i);
if (childNode == null) {
continue;
}
if (childNode.getNodeType() != Node.ELEMENT_NODE)
{
continue;
}
if (childNode.getLocalName() != null)
{
if (propertyName.equals(childNode.getLocalName()))
{
return childNode;
}
continue;
}
if (propertyName.equals(childNode.getNodeName()))
{
return childNode;
}
}
return null;
}
public Node[] getValueAsNodeArray(Node node)
{
NodeList list = node.getChildNodes();
int count = 0;
for (int i = 0; i < list.getLength(); i++)
{
Node childNode = list.item(i);
if (childNode == null) {
continue;
}
if (childNode.getNodeType() == Node.ELEMENT_NODE)
{
count++;
}
}
if (count == 0)
{
return new Node[0];
}
Node[] nodes = new Node[count];
int realized = 0;
for (int i = 0; i < list.getLength(); i++)
{
Node childNode = list.item(i);
if (childNode.getNodeType() != Node.ELEMENT_NODE)
{
continue;
}
if (childNode.getLocalName() != null)
{
if (propertyName.equals(childNode.getLocalName()))
{
nodes[realized++] = childNode;
}
continue;
}
if (childNode.getNodeName().equals(propertyName))
{
nodes[realized++] = childNode;
}
}
if (realized == count)
{
return nodes;
}
if (realized == 0)
{
return new Node[0];
}
Node[] shrunk = new Node[realized];
System.arraycopy(nodes, 0, shrunk, 0, realized);
return shrunk;
}
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");
}
if (!isArray)
{
Node node = (Node) obj.getUnderlying();
return getValueAsNode(node);
}
else
{
Node node = (Node) obj.getUnderlying();
return getValueAsNodeArray(node);
}
}
public boolean isExistsProperty(EventBean eventBean)
{
return true;
}
public Object getFragment(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 getValueAsFragment(node);
}
}