/*
***************************************************************************************
* Copyright (C) 2006 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.util;
import com.espertech.esper.client.EventBean;
import com.espertech.esper.client.EventType;
import com.espertech.esper.client.util.EventPropertyRenderer;
import com.espertech.esper.client.util.EventPropertyRendererContext;
import com.espertech.esper.client.util.XMLEventRenderer;
import com.espertech.esper.client.util.XMLRenderingOptions;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import java.lang.reflect.Array;
import java.util.Iterator;
import java.util.Map;
import java.util.Stack;
/**
* Renderer for XML-formatted properties.
*/
public class XMLRendererImpl implements XMLEventRenderer {
private static final Logger log = LoggerFactory.getLogger(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) {
EventPropertyRenderer propertyRenderer = null;
EventPropertyRendererContext propertyRendererContext = null;
if (options.getRenderer() != null) {
propertyRenderer = options.getRenderer();
propertyRendererContext = new EventPropertyRendererContext(eventType, false);
}
rendererMetaOptions = new RendererMetaOptions(options.isPreventLooping(), true, propertyRenderer, propertyRendererContext);
meta = new RendererMeta(eventType, new Stack<EventTypePropertyPair>(), rendererMetaOptions);
this.options = options;
}
public String render(String rootElementName, EventBean theEvent) {
if (options.isDefaultAsAttribute()) {
return renderAttributeXML(rootElementName, theEvent);
}
return renderElementXML(rootElementName, theEvent);
}
private String renderElementXML(String rootElementName, EventBean theEvent) {
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(theEvent, buf, 1, meta, rendererMetaOptions);
buf.append("</");
buf.append(getFirstWord(rootElementName));
buf.append('>');
return buf.toString();
}
private String renderAttributeXML(String rootElementName, EventBean theEvent) {
StringBuilder buf = new StringBuilder();
buf.append("<?xml version=\"1.0\" encoding=\"UTF-8\"?>");
buf.append(NEWLINE);
buf.append('<');
buf.append(rootElementName);
renderAttributes(theEvent, buf, meta);
String inner = renderAttElements(theEvent, 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 theEvent, int level, RendererMeta meta) {
StringBuilder buf = new StringBuilder();
GetterPair[] indexProps = meta.getIndexProperties();
for (GetterPair indexProp : indexProps) {
Object value = indexProp.getGetter().get(theEvent);
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('>');
if (rendererMetaOptions.getRenderer() == null) {
indexProp.getOutput().render(arrayItem, buf);
} else {
EventPropertyRendererContext context = rendererMetaOptions.getRendererContext();
context.setStringBuilderAndReset(buf);
context.setPropertyName(indexProp.getName());
context.setPropertyValue(arrayItem);
context.setIndexedPropertyIndex(i);
context.setDefaultRenderer(indexProp.getOutput());
rendererMetaOptions.getRenderer().render(context);
}
buf.append("</");
buf.append(indexProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
}
GetterPair[] mappedProps = meta.getMappedProperties();
for (GetterPair mappedProp : mappedProps) {
Object value = mappedProp.getGetter().get(theEvent);
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<String, Object> map = (Map<String, Object>) value;
if (!map.isEmpty()) {
Iterator<Map.Entry<String, Object>> it = map.entrySet().iterator();
for (; it.hasNext(); ) {
Map.Entry<String, Object> entry = it.next();
if ((entry.getKey() == null) || (entry.getValue() == null)) {
continue;
}
buf.append(" ");
buf.append(entry.getKey());
buf.append("=\"");
OutputValueRenderer outputValueRenderer = OutputValueRendererFactory.getOutputValueRenderer(entry.getValue().getClass(), rendererMetaOptions);
if (rendererMetaOptions.getRenderer() == null) {
outputValueRenderer.render(entry.getValue(), buf);
} else {
EventPropertyRendererContext context = rendererMetaOptions.getRendererContext();
context.setStringBuilderAndReset(buf);
context.setPropertyName(mappedProp.getName());
context.setPropertyValue(entry.getValue());
context.setMappedPropertyKey(entry.getKey());
context.setDefaultRenderer(outputValueRenderer);
rendererMetaOptions.getRenderer().render(context);
}
buf.append("\"");
}
}
}
buf.append("/>");
buf.append(NEWLINE);
}
NestedGetterPair[] nestedProps = meta.getNestedProperties();
for (NestedGetterPair nestedProp : nestedProps) {
Object value = nestedProp.getGetter().getFragment(theEvent);
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 theEvent, StringBuilder buf, RendererMeta meta) {
String delimiter = " ";
GetterPair[] simpleProps = meta.getSimpleProperties();
for (GetterPair simpleProp : simpleProps) {
Object value = simpleProp.getGetter().get(theEvent);
if (value == null) {
continue;
}
buf.append(delimiter);
buf.append(simpleProp.getName());
buf.append("=\"");
if (rendererMetaOptions.getRenderer() == null) {
simpleProp.getOutput().render(value, buf);
} else {
EventPropertyRendererContext context = rendererMetaOptions.getRendererContext();
context.setStringBuilderAndReset(buf);
context.setPropertyName(simpleProp.getName());
context.setPropertyValue(value);
context.setDefaultRenderer(simpleProp.getOutput());
rendererMetaOptions.getRenderer().render(context);
}
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 theEvent, StringBuilder buf, int level, RendererMeta meta, RendererMetaOptions rendererMetaOptions) {
GetterPair[] simpleProps = meta.getSimpleProperties();
for (GetterPair simpleProp : simpleProps) {
Object value = simpleProp.getGetter().get(theEvent);
if (value == null) {
continue;
}
ident(buf, level);
buf.append('<');
buf.append(simpleProp.getName());
buf.append('>');
if (rendererMetaOptions.getRenderer() == null) {
simpleProp.getOutput().render(value, buf);
} else {
EventPropertyRendererContext context = rendererMetaOptions.getRendererContext();
context.setStringBuilderAndReset(buf);
context.setPropertyName(simpleProp.getName());
context.setPropertyValue(value);
context.setDefaultRenderer(simpleProp.getOutput());
rendererMetaOptions.getRenderer().render(context);
}
buf.append("</");
buf.append(simpleProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
GetterPair[] indexProps = meta.getIndexProperties();
for (GetterPair indexProp : indexProps) {
Object value = indexProp.getGetter().get(theEvent);
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('>');
if (rendererMetaOptions.getRenderer() == null) {
indexProp.getOutput().render(arrayItem, buf);
} else {
EventPropertyRendererContext context = rendererMetaOptions.getRendererContext();
context.setStringBuilderAndReset(buf);
context.setPropertyName(indexProp.getName());
context.setPropertyValue(arrayItem);
context.setIndexedPropertyIndex(i);
context.setDefaultRenderer(indexProp.getOutput());
rendererMetaOptions.getRenderer().render(context);
}
buf.append("</");
buf.append(indexProp.getName());
buf.append('>');
buf.append(NEWLINE);
}
}
GetterPair[] mappedProps = meta.getMappedProperties();
for (GetterPair mappedProp : mappedProps) {
Object value = mappedProp.getGetter().get(theEvent);
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<String, Object> map = (Map<String, Object>) value;
if (!map.isEmpty()) {
String localDelimiter = "";
Iterator<Map.Entry<String, Object>> it = map.entrySet().iterator();
for (; it.hasNext(); ) {
Map.Entry<String, Object> entry = it.next();
if (entry.getKey() == null) {
continue;
}
buf.append(localDelimiter);
ident(buf, level + 1);
buf.append('<');
buf.append(entry.getKey());
buf.append('>');
if (entry.getValue() != null) {
OutputValueRenderer outputValueRenderer = OutputValueRendererFactory.getOutputValueRenderer(entry.getValue().getClass(), rendererMetaOptions);
if (rendererMetaOptions.getRenderer() == null) {
outputValueRenderer.render(entry.getValue(), buf);
} else {
EventPropertyRendererContext context = rendererMetaOptions.getRendererContext();
context.setStringBuilderAndReset(buf);
context.setPropertyName(mappedProp.getName());
context.setPropertyValue(entry.getValue());
context.setMappedPropertyKey(entry.getKey());
context.setDefaultRenderer(outputValueRenderer);
rendererMetaOptions.getRenderer().render(context);
}
}
buf.append("</");
buf.append(entry.getKey());
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(theEvent);
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);
}
}