Axis 2 example source code file (SchemaUnwrapperExtension.java)
The Axis 2 SchemaUnwrapperExtension.java source code/*
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* to you under the Apache License, Version 2.0 (the
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* http://www.apache.org/licenses/LICENSE-2.0
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package org.apache.axis2.wsdl.codegen.extension;
import org.apache.axis2.AxisFault;
import org.apache.axis2.description.AxisMessage;
import org.apache.axis2.description.AxisOperation;
import org.apache.axis2.description.AxisService;
import org.apache.axis2.description.Parameter;
import org.apache.axis2.wsdl.WSDLConstants;
import org.apache.axis2.wsdl.WSDLUtil;
import org.apache.axis2.wsdl.codegen.CodeGenConfiguration;
import org.apache.axis2.wsdl.codegen.CodeGenerationException;
import org.apache.axis2.wsdl.i18n.CodegenMessages;
import org.apache.axis2.wsdl.util.ConfigPropertyFileLoader;
import org.apache.axis2.wsdl.util.Constants;
import org.apache.axis2.wsdl.util.MessagePartInformationHolder;
import org.apache.ws.commons.schema.*;
import javax.xml.namespace.QName;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.LinkedList;
import java.util.List;
/**
* This extension invokes the schema unwrapper depending on the users setting. it is desirable to
* put this extension before other extensions since extnsions such as the databinding extension may
* well depend on the schema being unwrapped previously. For a complete unwrap the following format
* of the schema is expected < element > < complexType > < sequence > < element
* /> < /sequence > < /complexType > < /element >
* <p/>
* When an unwrapped WSDL is encountered Axis2 generates a wrapper schema and that wrapper schema
* has the above mentioned format. This unwrapping algorithm will work on a pure doc/lit WSDL if it
* has the above mentioned format only
*/
public class SchemaUnwrapperExtension extends AbstractCodeGenerationExtension {
private CodeGenConfiguration codeGenConfiguration;
/**
* @param configuration
* @throws CodeGenerationException
*/
public void engage(CodeGenConfiguration configuration) throws CodeGenerationException {
this.codeGenConfiguration = configuration;
if (!configuration.isParametersWrapped()) {
// A check to avoid nasty surprises - Since unwrapping is not
// supported by all frameworks, we check the framework name to be
// compatible
if (!ConfigPropertyFileLoader.getUnwrapSupportedFrameworkNames().
contains(configuration.getDatabindingType())) {
throw new CodeGenerationException(
CodegenMessages.getMessage("extension.unsupportedforunwrapping"));
} else if (!ConfigPropertyFileLoader.getUnwrapDirectFrameworkNames().
contains(configuration.getDatabindingType())) {
//walk the schema and find the top level elements
List services = configuration.getAxisServices();
AxisService axisService;
for (Iterator servicesIter = services.iterator(); servicesIter.hasNext();) {
axisService = (AxisService) servicesIter.next();
for (Iterator operations = axisService.getOperations();
operations.hasNext();) {
AxisOperation op = (AxisOperation) operations.next();
if (WSDLUtil.isInputPresentForMEP(op.getMessageExchangePattern())) {
walkSchema(op.getMessage(WSDLConstants.MESSAGE_LABEL_IN_VALUE),
WSDLConstants.INPUT_PART_QNAME_SUFFIX);
}
// get the out put parameter details as well to unwrap the responses
//TODO: support xmlbeans
if (configuration.getDatabindingType().equals("adb")) {
if (WSDLUtil.isOutputPresentForMEP(op.getMessageExchangePattern())) {
walkSchema(op.getMessage(WSDLConstants.MESSAGE_LABEL_OUT_VALUE),
WSDLConstants.OUTPUT_PART_QNAME_SUFFIX);
}
}
}
}
}
}
}
/**
* walk the given schema element For a successful unwrapping the element should have the
* following structure < element > < complexType > < sequence > < element
* /> < /sequence > < /complexType > < /element >
*/
public void walkSchema(AxisMessage message, String qnameSuffix)
throws CodeGenerationException {
//nothing to unwrap
if (message.getSchemaElement() == null) {
return;
}
List partNameList = new LinkedList();
XmlSchemaElement schemaElement = message.getSchemaElement();
XmlSchemaType schemaType = schemaElement.getSchemaType();
QName schemaTypeQname = schemaElement.getSchemaTypeName();
if (schemaType == null) {
if (schemaTypeQname != null) {
// find the schema type from all the schemas
// now we need to get the schema of the extension type from the parent schema. For that let's first retrieve
// the parent schema
AxisService axisService = message.getAxisOperation().getAxisService();
ArrayList schemasList = axisService.getSchema();
XmlSchema schema = null;
for (Iterator iter = schemasList.iterator(); iter.hasNext();) {
schema = (XmlSchema) iter.next();
schemaType = getSchemaType(schema, schemaTypeQname);
if (schemaType != null) {
break;
}
}
}
}
if (schemaType instanceof XmlSchemaComplexType) {
handleAllCasesOfComplexTypes(schemaType,
message,
partNameList,
qnameSuffix);
} else if ((schemaType instanceof XmlSchemaSimpleType) ||
((schemaTypeQname != null) && (schemaTypeQname.equals(new QName("http://www.w3.org/2001/XMLSchema", "anyType")))) ) {
QName opName = message.getAxisOperation().getName();
partNameList.add(WSDLUtil.getPartQName(opName.getLocalPart(),
qnameSuffix,
schemaElement.getQName().getLocalPart()));
} else if (schemaType == null) {
throw new CodeGenerationException("Can not determine the schema type for the "
+ schemaElement.getName());
} else {
//we've no idea how to unwrap a non complexType!!!!!!
throw new CodeGenerationException(
CodegenMessages.getMessage("extension.unsupportedSchemaFormat",
schemaType.getName(), "complexType"));
}
try {
//set in the axis message that the unwrapping was success
message.addParameter(getParameter(
Constants.UNWRAPPED_KEY,
Boolean.TRUE));
// attach the opName and the parts name list into the
// axis message by using the holder
MessagePartInformationHolder infoHolder = new MessagePartInformationHolder();
infoHolder.setOperationName(message.getAxisOperation().getName());
infoHolder.setPartsList(partNameList);
//attach it to the parameters
message.addParameter(
getParameter(Constants.UNWRAPPED_DETAILS,
infoHolder));
} catch (AxisFault axisFault) {
throw new CodeGenerationException(axisFault);
}
}
private void handleAllCasesOfComplexTypes(XmlSchemaType schemaType,
AxisMessage message,
List partNameList,
String qnameSuffix) throws CodeGenerationException {
// if a complex type name exits for a element then
// we keep that complex type to support unwrapping
if (schemaType instanceof XmlSchemaComplexType) {
XmlSchemaComplexType cmplxType = (XmlSchemaComplexType) schemaType;
if (cmplxType.getContentModel() == null) {
if (cmplxType.getParticle() != null) {
processXMLSchemaSequence(cmplxType.getParticle(), message, partNameList,
qnameSuffix);
}
} else {
// now lets handle case with extensions
processComplexContentModel(cmplxType, message, partNameList, qnameSuffix);
}
// handle attributes here
processAttributes(cmplxType, message, partNameList, qnameSuffix);
}
}
private void processAttributes(XmlSchemaComplexType complexType,
AxisMessage message,
List partNameList,
String qnameSuffix) {
QName opName = message.getAxisOperation().getName();
XmlSchemaObjectCollection xmlObjectCollection = complexType.getAttributes();
XmlSchemaObject item;
XmlSchemaAttribute xmlSchemaAttribute;
for (Iterator iter = xmlObjectCollection.getIterator(); iter.hasNext();) {
item = (XmlSchemaObject) iter.next();
if (item instanceof XmlSchemaAttribute) {
xmlSchemaAttribute = (XmlSchemaAttribute) item;
String partName = xmlSchemaAttribute.getName();
partNameList.add(
WSDLUtil.getPartQName(opName.getLocalPart(),
qnameSuffix,
partName));
}
}
}
private void processComplexContentModel(XmlSchemaComplexType cmplxType,
AxisMessage message,
List partNameList,
String qnameSuffix) throws CodeGenerationException {
XmlSchemaContentModel contentModel = cmplxType.getContentModel();
if (contentModel instanceof XmlSchemaComplexContent) {
XmlSchemaComplexContent xmlSchemaComplexContent = (XmlSchemaComplexContent) contentModel;
XmlSchemaContent content = xmlSchemaComplexContent.getContent();
if (content instanceof XmlSchemaComplexContentExtension) {
XmlSchemaComplexContentExtension schemaExtension = (XmlSchemaComplexContentExtension) content;
// process particles inside this extension, if any
if (schemaExtension.getParticle() != null) {
processXMLSchemaSequence(schemaExtension.getParticle(), message, partNameList,
qnameSuffix);
}
// now we need to get the schema of the extension type from the parent schema. For that let's first retrieve
// the parent schema
AxisService axisService = message.getAxisOperation().getAxisService();
ArrayList schemasList = axisService.getSchema();
XmlSchema parentSchema = null;
XmlSchema schema = null;
XmlSchemaType extensionSchemaType = null;
for (Iterator iter = schemasList.iterator(); iter.hasNext();) {
schema = (XmlSchema) iter.next();
extensionSchemaType = getSchemaType(schema, schemaExtension.getBaseTypeName());
if (extensionSchemaType != null) {
break;
}
}
// ok now we got the parent schema. Now let's get the extension's schema type
handleAllCasesOfComplexTypes(extensionSchemaType, message, partNameList,
qnameSuffix);
}
}
}
private XmlSchemaType getSchemaType(XmlSchema schema, QName typeName) {
XmlSchemaType xmlSchemaType = null;
if (schema != null) {
xmlSchemaType = schema.getTypeByName(typeName);
if (xmlSchemaType == null) {
// try to find in an import or an include
XmlSchemaObjectCollection includes = schema.getIncludes();
if (includes != null) {
Iterator includesIter = includes.getIterator();
Object object = null;
while (includesIter.hasNext()) {
object = includesIter.next();
if (object instanceof XmlSchemaImport) {
XmlSchema schema1 = ((XmlSchemaImport) object).getSchema();
xmlSchemaType = getSchemaType(schema1, typeName);
}
if (object instanceof XmlSchemaInclude) {
XmlSchema schema1 = ((XmlSchemaInclude) object).getSchema();
xmlSchemaType = getSchemaType(schema1, typeName);
}
if (xmlSchemaType != null) {
break;
}
}
}
}
}
return xmlSchemaType;
}
private void processXMLSchemaSequence(XmlSchemaParticle schemaParticle,
AxisMessage message,
List partNameList,
String qnameSuffix) throws CodeGenerationException {
if (schemaParticle instanceof XmlSchemaSequence) {
// get the name of the operation name and namespace,
// part name and hang them somewhere ? The ideal place
// would be the property bag in the codegen config!
QName opName = message.getAxisOperation().getName();
XmlSchemaSequence sequence = (XmlSchemaSequence) schemaParticle;
XmlSchemaObjectCollection items = sequence.getItems();
// if this is an empty sequence, return
if (items.getCount() == 0) {
return;
}
for (Iterator i = items.getIterator(); i.hasNext();) {
Object item = i.next();
// get each and every element in the sequence and
// traverse through them
if (item instanceof XmlSchemaElement) {
//add the element name to the part name list
XmlSchemaElement xmlSchemaElement = (XmlSchemaElement) item;
XmlSchemaType schemaType = xmlSchemaElement.getSchemaType();
String partName = null;
if (xmlSchemaElement.getRefName() != null) {
partName = xmlSchemaElement.getRefName().getLocalPart();
} else {
partName = xmlSchemaElement.getName();
}
// part names are not unique across messages. Hence
// we need some way of making the part name a unique
// one (due to the fact that the type mapper
// is a global list of types).
// The seemingly best way to do that is to
// specify a namespace for the part QName reference which
// is stored in the list. This part qname is
// temporary and should not be used with it's
// namespace URI (which happened to be the operation name)
// with _input attached to it
partNameList.add(
WSDLUtil.getPartQName(opName.getLocalPart(),
qnameSuffix,
partName));
// if the particle contains anything other than
// a XMLSchemaElement then we are not in a position
// to unwrap it
} else if (item instanceof XmlSchemaAny) {
// if this is an instance of xs:any, then there is no part name for it. Using ANY_ELEMENT_FIELD_NAME
// for it for now
//we have to handle both maxoccurs 1 and maxoccurs > 1 situation
XmlSchemaAny xmlSchemaAny = (XmlSchemaAny) item;
partNameList.add(
WSDLUtil.getPartQName(opName.getLocalPart(),
qnameSuffix,
Constants.ANY_ELEMENT_FIELD_NAME));
} else {
throw new CodeGenerationException(
CodegenMessages.getMessage("extension.unsupportedSchemaFormat",
"unknown type", "Element"));
}
}
//we do not know how to deal with other particles
//such as xs:all or xs:choice. Usually occurs when
//passed with the user built WSDL where the style
//is document.
} else if (schemaParticle instanceof XmlSchemaChoice) {
throw new CodeGenerationException(
CodegenMessages.getMessage("extension.unsupportedSchemaFormat",
"choice", "sequence"));
} else if (schemaParticle instanceof XmlSchemaAll) {
throw new CodeGenerationException(
CodegenMessages.getMessage("extension.unsupportedSchemaFormat",
"all", "sequence"));
} else {
throw new CodeGenerationException(
CodegenMessages.getMessage("extension.unsupportedSchemaFormat",
"unknown", "sequence"));
}
}
/**
* Generate a parametes object
*
* @param key
* @param value
*/
private Parameter getParameter(String key, Object value) {
Parameter myParameter = new Parameter();
myParameter.setName(key);
myParameter.setValue(value);
return myParameter;
}
}
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