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Complex event processing and event series analysis component
/*
***************************************************************************************
* 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.xml;
import com.espertech.esper.client.EPException;
import com.espertech.esper.client.PropertyAccessException;
import com.sun.org.apache.xerces.internal.impl.dv.XSSimpleType;
import org.w3c.dom.*;
import javax.xml.namespace.QName;
import javax.xml.xpath.XPathConstants;
import java.io.IOException;
import java.io.StringWriter;
import java.io.Writer;
import java.lang.reflect.Array;
import java.util.HashMap;
import java.util.Map;
/**
* Utility class for querying schema information via Xerces implementation classes.
*
* @author pablo
*/
public class SchemaUtil {
private static Map typeMap;
static {
typeMap = new HashMap();
Object[][] types = new Object[][]{
{"nonPositiveInteger", Integer.class},
{"nonNegativeInteger", Integer.class},
{"negativeInteger", Integer.class},
{"positiveInteger", Integer.class},
{"long", Long.class},
{"unsignedLong", Long.class},
{"int", Integer.class},
{"unsignedInt", Integer.class},
{"decimal", Double.class},
{"integer", Integer.class},
{"float", Float.class},
{"double", Double.class},
{"string", String.class},
{"short", Short.class},
{"unsignedShort", Short.class},
{"byte", Byte.class},
{"unsignedByte", Byte.class},
{"boolean", Boolean.class},
{"dateTime", String.class},
{"date", String.class},
{"time", String.class}};
for (int i = 0; i < types.length; i++) {
typeMap.put(types[i][0].toString(), (Class) types[i][1]);
}
}
/**
* Returns the Class-type of the schema item.
*
* @param item to to determine type for
* @return type
*/
public static Class toReturnType(SchemaItem item) {
if (item instanceof SchemaItemAttribute) {
SchemaItemAttribute att = (SchemaItemAttribute) item;
return SchemaUtil.toReturnType(att.getXsSimpleType(), att.getTypeName(), null);
} else if (item instanceof SchemaElementSimple) {
SchemaElementSimple simple = (SchemaElementSimple) item;
Class returnType = SchemaUtil.toReturnType(simple.getXsSimpleType(), simple.getTypeName(), simple.getFractionDigits());
if (simple.isArray()) {
returnType = Array.newInstance(returnType, 0).getClass();
}
return returnType;
} else if (item instanceof SchemaElementComplex) {
SchemaElementComplex complex = (SchemaElementComplex) item;
if (complex.getOptionalSimpleType() != null) {
return SchemaUtil.toReturnType(complex.getOptionalSimpleType(), complex.getOptionalSimpleTypeName(), null);
}
if (complex.isArray()) {
return NodeList.class;
}
return Node.class;
} else {
throw new PropertyAccessException("Invalid schema return type:" + item);
}
}
/**
* Returns the type for a give short type and type name.
*
* @param xsType XSSimplyType type
* @param typeName type name in XML standard
* @param optionalFractionDigits fraction digits if any are defined
* @return equivalent native type
*/
public static Class toReturnType(short xsType, String typeName, Integer optionalFractionDigits) {
if (typeName != null) {
Class result = typeMap.get(typeName);
if (result != null) {
return result;
}
}
switch (xsType) {
case XSSimpleType.PRIMITIVE_BOOLEAN:
return Boolean.class;
case XSSimpleType.PRIMITIVE_STRING:
return String.class;
case XSSimpleType.PRIMITIVE_DECIMAL:
if ((optionalFractionDigits != null) && (optionalFractionDigits > 0)) {
return Double.class;
}
return Integer.class;
case XSSimpleType.PRIMITIVE_FLOAT:
return Float.class;
case XSSimpleType.PRIMITIVE_DOUBLE:
return Double.class;
default:
return String.class;
}
}
/**
* Returns the native type based on XPathConstants qname and an optional cast-to type, if provided.
*
* @param resultType qname
* @param optionalCastToType null or cast-to type
* @return return type
*/
public static Class toReturnType(QName resultType, Class optionalCastToType) {
if (optionalCastToType != null) {
return optionalCastToType;
}
if (resultType.equals(XPathConstants.NODESET))
return NodeList.class;
if (resultType.equals(XPathConstants.NODE))
return Node.class;
if (resultType.equals(XPathConstants.BOOLEAN))
return Boolean.class;
if (resultType.equals(XPathConstants.NUMBER))
return Double.class;
if (resultType.equals(XPathConstants.STRING))
return String.class;
return String.class;
}
/**
* Returns the XPathConstants type for a given Xerces type definition.
*
* @param type is the type
* @return XPathConstants type
*/
public static QName simpleTypeToQName(short type) {
switch (type) {
case XSSimpleType.PRIMITIVE_BOOLEAN:
return XPathConstants.BOOLEAN;
case XSSimpleType.PRIMITIVE_DOUBLE:
return XPathConstants.NUMBER;
case XSSimpleType.PRIMITIVE_STRING:
return XPathConstants.STRING;
case XSSimpleType.PRIMITIVE_DECIMAL:
return XPathConstants.NUMBER;
case XSSimpleType.PRIMITIVE_FLOAT:
return XPathConstants.NUMBER;
case XSSimpleType.PRIMITIVE_DATETIME:
return XPathConstants.STRING;
case XSSimpleType.PRIMITIVE_DATE:
return XPathConstants.STRING;
case XSSimpleType.PRIMITIVE_TIME:
return XPathConstants.STRING;
default:
throw new EPException("Unexpected schema simple type encountered '" + type + "'");
}
}
/**
* Returns the root element for a given schema given a root element name and namespace.
*
* @param schema is the schema to interrogate
* @param namespace is the namespace of the root element
* @param elementName is the name of the root element
* @return declaration of root element
*/
public static SchemaElementComplex findRootElement(SchemaModel schema, String namespace, String elementName) {
if ((namespace != null) && namespace.length() != 0) {
for (SchemaElementComplex complexElement : schema.getComponents()) {
if ((complexElement.getNamespace().equals(namespace)) && (complexElement.getName().equals(elementName))) {
return complexElement;
}
}
} else {
for (SchemaElementComplex complexElement : schema.getComponents()) {
if (complexElement.getName().equals(elementName)) {
return complexElement;
}
}
}
if (elementName.startsWith("//")) {
elementName = elementName.substring(2);
for (SchemaElementComplex complexElement : schema.getComponents()) {
SchemaElementComplex match = recursiveDeepMatch(complexElement, namespace, elementName);
if (match != null) {
return match;
}
}
}
String text = "Could not find root element declaration in schema for element name '" + elementName + '\'';
if (namespace != null) {
text = text + " in namespace '" + namespace + '\'';
}
throw new EPException(text);
}
private static SchemaElementComplex recursiveDeepMatch(SchemaElementComplex parent, String namespace, String elementName) {
if ((namespace != null) && namespace.length() != 0) {
for (SchemaElementComplex complexElement : parent.getChildren()) {
if ((complexElement.getNamespace().equals(namespace)) && (complexElement.getName().equals(elementName))) {
return complexElement;
}
}
} else {
for (SchemaElementComplex complexElement : parent.getChildren()) {
if (complexElement.getName().equals(elementName)) {
return complexElement;
}
}
}
for (SchemaElementComplex complexElement : parent.getChildren()) {
SchemaElementComplex found = recursiveDeepMatch(complexElement, namespace, elementName);
if (found != null) {
return found;
}
}
return null;
}
/**
* Finds an apropiate definition for the given property, starting at the * given definition.
* First look if the property es an attribute. If not, look at simple and then child element
* definitions.
*
* @param def the definition to start looking
* @param property the property to look for
* @return schema element or null if not found
*/
public static SchemaItem findPropertyMapping(SchemaElementComplex def, String property) {
for (SchemaItemAttribute attribute : def.getAttributes()) {
if (attribute.getName().equals(property)) {
return attribute;
}
}
for (SchemaElementSimple simple : def.getSimpleElements()) {
if (simple.getName().equals(property)) {
return simple;
}
}
for (SchemaElementComplex complex : def.getChildren()) {
if (complex.getName().equals(property)) {
return complex;
}
}
//property not found in schema
return null;
}
/**
* Serialize the given node.
*
* @param doc node to serialize
* @return serialized node string
*/
public static String serialize(Node doc) {
StringWriter writer = new StringWriter();
try {
serializeNode(doc, "", writer);
} catch (IOException e) {
throw new RuntimeException(e);
}
writer.flush();
return writer.toString();
}
private static void serializeNode(Node node, String
indentLevel, StringWriter writer) throws IOException {
switch (node.getNodeType()) {
case Node.DOCUMENT_NODE:
Document doc = (Document) node;
writer.write("\n");
NodeList nodes = node.getChildNodes();
if (nodes != null) {
for (int i = 0; i < nodes.getLength(); i++) {
serializeNode(nodes.item(i), "", writer);
}
}
break;
case Node.ELEMENT_NODE:
String name = node.getNodeName();
writer.write(indentLevel + "<" + name);
NamedNodeMap attributes = node.getAttributes();
for (int i = 0; i < attributes.getLength(); i++) {
Node current = attributes.item(i);
writer.write(" " + current.getNodeName() + "=\"");
print(current.getNodeValue(), writer);
writer.write("\"");
}
writer.write(">");
NodeList children = node.getChildNodes();
if (children != null) {
if ((children.item(0) != null) && (children.item(0).getNodeType() == Node.ELEMENT_NODE)) {
writer.write("\n");
}
for (int i = 0; i < children.getLength(); i++) {
serializeNode(children.item(i), indentLevel, writer);
}
if ((children.item(0) != null)
&& (children.item(children.getLength() - 1).getNodeType() == Node.ELEMENT_NODE)) {
writer.write(indentLevel);
}
}
writer.write("\n");
break;
case Node.TEXT_NODE:
print(node.getNodeValue(), writer);
break;
case Node.CDATA_SECTION_NODE:
writer.write("CDATA");
print(node.getNodeValue(), writer);
writer.write("");
break;
case Node.COMMENT_NODE:
writer.write(indentLevel + "\n");
break;
case Node.PROCESSING_INSTRUCTION_NODE:
writer.write("\n");
break;
case Node.ENTITY_REFERENCE_NODE:
writer.write("&" + node.getNodeName() + ";");
break;
case Node.DOCUMENT_TYPE_NODE:
DocumentType docType = (DocumentType) node;
String publicId = docType.getPublicId();
String systemId = docType.getSystemId();
String internalSubset = docType.getInternalSubset();
writer.write("\n");
break;
default:
break;
}
}
private static void print(String s, Writer writer) throws IOException {
if (s == null) {
return;
}
for (int i = 0, len = s.length(); i < len; i++) {
char c = s.charAt(i);
switch (c) {
case '<':
writer.write("<");
break;
case '>':
writer.write(">");
break;
case '&':
writer.write("&");
break;
case '\r':
writer.write("
");
break;
default:
writer.write(c);
}
}
}
}
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