package com.espertech.esper.event.util;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.client.util.XMLEventRenderer;
import com.espertech.esper.client.util.XMLRenderingOptions;
import org.apache.commons.logging.Log;
import org.apache.commons.logging.LogFactory;
import java.lang.reflect.Array;
import java.util.Stack;
import java.util.Map;
import java.util.Iterator;
/**
* Renderer for XML-formatted properties.
*/
public class XMLRendererImpl implements XMLEventRenderer
{
private static final Log log = LogFactory.getLog(XMLRendererImpl.class);
private final static String NEWLINE = System.getProperty("line.separator");
private final RendererMeta meta;
private final XMLRenderingOptions options;
private final RendererMetaOptions rendererMetaOptions;
/**
* Ctor.
* @param eventType type of event to render
* @param options rendering options
*/
public XMLRendererImpl(EventType eventType, XMLRenderingOptions options)
{
rendererMetaOptions = new RendererMetaOptions(options.isPreventLooping(), true);
meta = new RendererMeta(eventType, new Stack<EventTypePropertyPair>(), rendererMetaOptions);
this.options = options;
}
public String render(String rootElementName, EventBean event)
{
if (options.isDefaultAsAttribute())
{
return renderAttributeXML(rootElementName, event);
}
return renderElementXML(rootElementName, event);
}
private String renderElementXML(String rootElementName, EventBean event)
{
StringBuilder buf = new StringBuilder();
buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
buf.append(NEWLINE);
buf.append('<');
buf.append(rootElementName);
buf.append('>');
buf.append(NEWLINE);
recursiveRender(event, buf, 1, meta, rendererMetaOptions);
buf.append("</");
buf.append(getFirstWord(rootElementName));
buf.append('>');
return buf.toString();
}
private String renderAttributeXML(String rootElementName, EventBean event)
{
StringBuilder buf = new StringBuilder();
buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
buf.append(NEWLINE);
buf.append('<');
buf.append(rootElementName);
renderAttributes(event, buf, meta);
String inner = renderAttElements(event, 1, meta);
if ((inner == null) || (inner.trim().length() == 0))
{
buf.append("/>");
buf.append(NEWLINE);
}
else
{
buf.append(">");
buf.append(NEWLINE);
buf.append(inner);
buf.append("</");
buf.append(getFirstWord(rootElementName));
buf.append('>');
}
return buf.toString();
}
private String renderAttElements(EventBean event, int level, RendererMeta meta)
{
StringBuilder buf = new StringBuilder();
GetterPair[] indexProps = meta.getIndexProperties();
for (GetterPair indexProp : indexProps)
{
Object value = indexProp.getGetter().get(event);
if (value == null)
{
continue;
}
if (!value.getClass().isArray())
{
log.warn("Property '" + indexProp.getName() + "' returned a non-array object");
continue;
}
for (int i = 0; i < Array.getLength(value); i++)
{
Object arrayItem = Array.get(value, i);
if (arrayItem == null)
{
continue;
}
ident(buf, level);
buf.append('<');
buf.append(indexProp.getName());
buf.append('>');
indexProp.getOutput().render(arrayItem, buf);
buf.append("</");
buf.append(indexProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
}
GetterPair[] mappedProps = meta.getMappedProperties();
for (GetterPair mappedProp : mappedProps)
{
Object value = mappedProp.getGetter().get(event);
if ((value != null) && (!(value instanceof Map)))
{
log.warn("Property '" + mappedProp.getName() + "' expected to return Map and returned " + value.getClass() + " instead");
continue;
}
ident(buf, level);
buf.append('<');
buf.append(mappedProp.getName());
if (value != null)
{
Map map = (Map) value;
if (!map.isEmpty())
{
Iterator<Map.Entry> it = map.entrySet().iterator();
for (;it.hasNext();)
{
Map.Entry entry = it.next();
if ((entry.getKey() == null) || (entry.getValue() == null))
{
continue;
}
buf.append(" ");
buf.append(entry.getKey().toString());
buf.append("=\"");
OutputValueRenderer out = OutputValueRendererFactory.getOutputValueRenderer(entry.getValue().getClass(), rendererMetaOptions);
out.render(entry.getValue(), buf);
buf.append("\"");
}
}
}
buf.append("/>");
buf.append(NEWLINE);
}
NestedGetterPair[] nestedProps = meta.getNestedProperties();
for (NestedGetterPair nestedProp : nestedProps)
{
Object value = nestedProp.getGetter().getFragment(event);
if (value == null)
{
continue;
}
if (!nestedProp.isArray())
{
if (!(value instanceof EventBean))
{
log.warn("Property '" + nestedProp.getName() + "' expected to return EventBean and returned " + value.getClass() + " instead");
buf.append("null");
continue;
}
EventBean nestedEventBean = (EventBean) value;
renderAttInner(buf, level, nestedEventBean, nestedProp);
}
else
{
if (!(value instanceof EventBean[]))
{
log.warn("Property '" + nestedProp.getName() + "' expected to return EventBean[] and returned " + value.getClass() + " instead");
buf.append("null");
continue;
}
EventBean[] nestedEventArray = (EventBean[]) value;
for (int i = 0; i < nestedEventArray.length; i++)
{
EventBean arrayItem = nestedEventArray[i];
renderAttInner(buf, level, arrayItem, nestedProp);
}
}
}
return buf.toString();
}
private void renderAttributes(EventBean event, StringBuilder buf, RendererMeta meta)
{
String delimiter = " ";
GetterPair[] simpleProps = meta.getSimpleProperties();
for (GetterPair simpleProp : simpleProps)
{
Object value = simpleProp.getGetter().get(event);
if (value == null)
{
continue;
}
buf.append(delimiter);
buf.append(simpleProp.getName());
buf.append("=\"");
simpleProp.getOutput().render(value, buf);
buf.append('"');
}
}
private static void ident(StringBuilder buf, int level)
{
for (int i = 0; i < level; i++)
{
indentChar(buf);
}
}
private static void indentChar(StringBuilder buf)
{
buf.append(' ');
buf.append(' ');
}
private static void recursiveRender(EventBean event, StringBuilder buf, int level, RendererMeta meta, RendererMetaOptions rendererMetaOptions)
{
GetterPair[] simpleProps = meta.getSimpleProperties();
for (GetterPair simpleProp : simpleProps)
{
Object value = simpleProp.getGetter().get(event);
if (value == null)
{
continue;
}
ident(buf, level);
buf.append('<');
buf.append(simpleProp.getName());
buf.append('>');
simpleProp.getOutput().render(value, buf);
buf.append("</");
buf.append(simpleProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
GetterPair[] indexProps = meta.getIndexProperties();
for (GetterPair indexProp : indexProps)
{
Object value = indexProp.getGetter().get(event);
if (value == null)
{
continue;
}
if (!value.getClass().isArray())
{
log.warn("Property '" + indexProp.getName() + "' returned a non-array object");
continue;
}
for (int i = 0; i < Array.getLength(value); i++)
{
Object arrayItem = Array.get(value, i);
if (arrayItem == null)
{
continue;
}
ident(buf, level);
buf.append('<');
buf.append(indexProp.getName());
buf.append('>');
indexProp.getOutput().render(arrayItem, buf);
buf.append("</");
buf.append(indexProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
}
GetterPair[] mappedProps = meta.getMappedProperties();
for (GetterPair mappedProp : mappedProps)
{
Object value = mappedProp.getGetter().get(event);
if ((value != null) && (!(value instanceof Map)))
{
log.warn("Property '" + mappedProp.getName() + "' expected to return Map and returned " + value.getClass() + " instead");
continue;
}
ident(buf, level);
buf.append('<');
buf.append(mappedProp.getName());
buf.append('>');
buf.append(NEWLINE);
if (value != null)
{
Map map = (Map) value;
if (!map.isEmpty())
{
String localDelimiter = "";
Iterator<Map.Entry> it = map.entrySet().iterator();
for (;it.hasNext();)
{
Map.Entry entry = it.next();
if (entry.getKey() == null)
{
continue;
}
buf.append(localDelimiter);
ident(buf, level + 1);
buf.append('<');
buf.append(entry.getKey().toString());
buf.append('>');
if (entry.getValue() != null)
{
OutputValueRenderer out = OutputValueRendererFactory.getOutputValueRenderer(entry.getValue().getClass(), rendererMetaOptions);
out.render(entry.getValue(), buf);
}
buf.append('<');
buf.append(entry.getKey().toString());
buf.append('>');
localDelimiter = NEWLINE;
}
}
}
buf.append(NEWLINE);
ident(buf, level);
buf.append("</");
buf.append(mappedProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
NestedGetterPair[] nestedProps = meta.getNestedProperties();
for (NestedGetterPair nestedProp : nestedProps)
{
Object value = nestedProp.getGetter().getFragment(event);
if (value == null)
{
continue;
}
if (!nestedProp.isArray())
{
if (!(value instanceof EventBean))
{
log.warn("Property '" + nestedProp.getName() + "' expected to return EventBean and returned " + value.getClass() + " instead");
buf.append("null");
continue;
}
renderElementFragment((EventBean) value, buf, level, nestedProp, rendererMetaOptions);
}
else
{
if (!(value instanceof EventBean[]))
{
log.warn("Property '" + nestedProp.getName() + "' expected to return EventBean[] and returned " + value.getClass() + " instead");
buf.append("null");
continue;
}
EventBean[] nestedEventArray = (EventBean[]) value;
for (int i = 0; i < nestedEventArray.length; i++)
{
EventBean arrayItem = nestedEventArray[i];
if (arrayItem == null)
{
continue;
}
renderElementFragment(arrayItem, buf, level, nestedProp, rendererMetaOptions);
}
}
}
}
private static void renderElementFragment(EventBean eventBean, StringBuilder buf, int level, NestedGetterPair nestedProp, RendererMetaOptions rendererMetaOptions)
{
ident(buf, level);
buf.append('<');
buf.append(nestedProp.getName());
buf.append('>');
buf.append(NEWLINE);
recursiveRender(eventBean, buf, level + 1, nestedProp.getMetadata(), rendererMetaOptions);
ident(buf, level);
buf.append("</");
buf.append(nestedProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
private void renderAttInner(StringBuilder buf, int level, EventBean nestedEventBean, NestedGetterPair nestedProp)
{
ident(buf, level);
buf.append('<');
buf.append(nestedProp.getName());
renderAttributes(nestedEventBean, buf, nestedProp.getMetadata());
String inner = renderAttElements(nestedEventBean, level + 1, nestedProp.getMetadata());
if ((inner == null) || (inner.trim().length() == 0))
{
buf.append("/>");
buf.append(NEWLINE);
}
else
{
buf.append(">");
buf.append(NEWLINE);
buf.append(inner);
ident(buf, level);
buf.append("</");
buf.append(nestedProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
}
private String getFirstWord(String rootElementName)
{
if ((rootElementName == null) || (rootElementName.trim().length() == 0))
{
return rootElementName;
}
int index = rootElementName.indexOf(' ');
if (index < 0)
{
return rootElementName;
}
return rootElementName.substring(0, index);
}
}