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/*
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you under the Apache License, Version 2.0 (the
* "License"); you may not use this file except in compliance
* with the License. You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing,
* software distributed under the License is distributed on an
* "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
* KIND, either express or implied. See the License for the
* specific language governing permissions and limitations
* under the License.
*/
package org.apache.tuscany.sca.databinding.axiom;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
import org.apache.axiom.om.OMAbstractFactory;
import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMFactory;
import org.apache.axiom.om.OMNamespace;
import org.apache.tuscany.sca.databinding.WrapperHandler;
import org.apache.tuscany.sca.interfacedef.DataType;
import org.apache.tuscany.sca.interfacedef.Operation;
import org.apache.tuscany.sca.interfacedef.impl.DataTypeImpl;
import org.apache.tuscany.sca.interfacedef.util.ElementInfo;
import org.apache.tuscany.sca.interfacedef.util.TypeInfo;
import org.apache.tuscany.sca.interfacedef.util.WrapperInfo;
import org.apache.tuscany.sca.interfacedef.util.XMLType;
/**
* OMElement wrapper handler implementation
*
* @version $Rev$ $Date$
*/
public class OMElementWrapperHandler implements WrapperHandler<OMElement> {
private OMFactory factory;
public OMElementWrapperHandler() {
super();
this.factory = OMAbstractFactory.getOMFactory();
}
public OMElement create(Operation operation, boolean input) {
WrapperInfo inputWrapperInfo = operation.getInputWrapper();
WrapperInfo outputWrapperInfo = operation.getOutputWrapper();
ElementInfo element = input ? inputWrapperInfo.getWrapperElement() :
outputWrapperInfo.getWrapperElement();
OMElement wrapper = AxiomHelper.createOMElement(factory, element.getQName());
return wrapper;
}
public void setChildren(OMElement wrapper, Object[] childObjects, Operation operation, boolean input) {
WrapperInfo inputWrapperInfo = operation.getInputWrapper();
WrapperInfo outputWrapperInfo = operation.getOutputWrapper();
List<ElementInfo> childElements = input? inputWrapperInfo.getChildElements():
outputWrapperInfo.getChildElements();
for (int i = 0; i < childElements.size(); i++) {
setChild(wrapper, i, childElements.get(i), childObjects[i]);
}
}
public void setChild(OMElement wrapper, int i, ElementInfo childElement, Object value) {
if (childElement.isMany()) {
Object[] elements = (Object[])value;
if (value != null) {
for (Object e : elements) {
addChild(wrapper, childElement, (OMElement)e);
}
}
} else {
OMElement element = (OMElement)value;
addChild(wrapper, childElement, element);
}
}
private void addChild(OMElement wrapper, ElementInfo childElement, OMElement element) {
if (element == null) {
OMElement e = wrapper.getOMFactory().createOMElement(childElement.getQName(), wrapper);
attachXSINil(e);
return;
}
QName elementName = childElement.getQName();
// Make it a bit tolerating of element QName
if (!elementName.equals(element.getQName())) {
OMNamespace namespace = factory.createOMNamespace(elementName.getNamespaceURI(), elementName.getPrefix());
element.setNamespace(namespace);
element.setLocalName(childElement.getQName().getLocalPart());
}
wrapper.addChild(element);
}
public List getChildren(OMElement wrapper, Operation operation, boolean input) {
WrapperInfo inputWrapperInfo = operation.getInputWrapper();
WrapperInfo outputWrapperInfo = operation.getOutputWrapper();
List<ElementInfo> childElements = input? inputWrapperInfo.getChildElements():
outputWrapperInfo.getChildElements();
List<Object> elements = new ArrayList<Object>();
int i = 0;
for (ElementInfo e : childElements) {
elements.add(getChild(wrapper, e, i));
i++;
}
return elements;
}
/**
* @see org.apache.tuscany.sca.databinding.WrapperHandler#getWrapperType(Operation, boolean)
*/
public DataType getWrapperType(Operation operation, boolean input) {
WrapperInfo inputWrapperInfo = operation.getInputWrapper();
WrapperInfo outputWrapperInfo = operation.getOutputWrapper();
ElementInfo element = input ? inputWrapperInfo.getWrapperElement() :
outputWrapperInfo.getWrapperElement();
DataType<XMLType> wrapperType =
new DataTypeImpl<XMLType>(AxiomDataBinding.NAME, OMElement.class, new XMLType(element));
return wrapperType;
}
public boolean isInstance(Object wrapperObj, Operation operation, boolean input) {
WrapperInfo inputWrapperInfo = operation.getInputWrapper();
WrapperInfo outputWrapperInfo = operation.getOutputWrapper();
ElementInfo element = input ? inputWrapperInfo.getWrapperElement() :
outputWrapperInfo.getWrapperElement();
OMElement wrapper = (OMElement)wrapperObj;
if (!element.getQName().equals(wrapper.getQName())) {
return false;
}
return true;
/*
Set<QName> names = new HashSet<QName>();
for (ElementInfo e : childElements) {
names.add(e.getQName());
}
for (Iterator i = wrapper.getChildElements(); i.hasNext();) {
OMElement child = (OMElement)i.next();
if (!names.contains(child.getQName())) {
return false;
}
}
return true;
*/
}
private static final QName XSI_TYPE_QNAME = new QName("http://www.w3.org/2001/XMLSchema-instance", "type", "xsi");
private List<List<OMElement>> getElements(OMElement wrapper) {
List<List<OMElement>> elements = new ArrayList<List<OMElement>>();
List<OMElement> current = new ArrayList<OMElement>();
elements.add(current);
boolean first = true;
QName last = null;
for (Iterator i = wrapper.getChildElements(); i.hasNext();) {
OMElement element = (OMElement)i.next();
if (first || element.getQName().equals(last)) {
current.add(element);
last = element.getQName();
} else {
current = new ArrayList<OMElement>();
elements.add(current);
current.add(element);
last = element.getQName();
}
first = false;
}
return elements;
}
public Object getChild(OMElement wrapper, ElementInfo childElement, int index) {
Iterator children = wrapper.getChildrenWithName(childElement.getQName());
if (!children.hasNext()) {
// No name match, try by index
List<List<OMElement>> list = getElements(wrapper);
List<OMElement> elements = list.get(index);
if (!childElement.isMany()) {
return elements.isEmpty() ? null : attachXSIType(childElement, elements.get(0));
} else {
Object[] array = elements.toArray();
for (Object item : array) {
attachXSIType(childElement, (OMElement)item);
}
return array;
}
}
if (!childElement.isMany()) {
if (children.hasNext()) {
OMElement child = (OMElement)children.next();
attachXSIType(childElement, child);
return child;
} else {
return null;
}
} else {
List<OMElement> elements = new ArrayList<OMElement>();
for (; children.hasNext();) {
OMElement child = (OMElement)children.next();
attachXSIType(childElement, child);
elements.add(child);
}
return elements.toArray();
}
}
/**
* Create xis:type if required
* @param childElement
* @param element
* @return
*/
private OMElement attachXSIType(ElementInfo childElement, OMElement element) {
TypeInfo type = childElement.getType();
if (type != null && type.getQName() != null) {
OMAttribute attr = element.getAttribute(XSI_TYPE_QNAME);
if (attr == null) {
String typeNS = type.getQName().getNamespaceURI();
if (XMLConstants.W3C_XML_SCHEMA_NS_URI.equals(typeNS)) {
return element;
}
OMNamespace ns = element.getOMFactory().createOMNamespace(typeNS, "_typens_");
element.declareNamespace(ns);
OMNamespace xsiNS =
element.getOMFactory().createOMNamespace(XSI_TYPE_QNAME.getNamespaceURI(),
XSI_TYPE_QNAME.getPrefix());
element.declareNamespace(xsiNS);
attr =
element.getOMFactory().createOMAttribute("type",
xsiNS,
"_typens_:" + type.getQName().getLocalPart());
element.addAttribute(attr);
}
}
return element;
}
private void attachXSINil(OMElement element) {
OMNamespace xsiNS =
element.getOMFactory().createOMNamespace(XSI_TYPE_QNAME.getNamespaceURI(), XSI_TYPE_QNAME.getPrefix());
element.declareNamespace(xsiNS);
OMAttribute attr = element.getOMFactory().createOMAttribute("nil", xsiNS, "true");
element.addAttribute(attr);
}
}
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