org.plasma.sdo.xpath.MetaDataNavigator Maven / Gradle / Ivy
/**
* PlasmaSDO™ License
*
* This is a community release of PlasmaSDO™, a dual-license
* Service Data Object (SDO) 2.1 implementation.
* This particular copy of the software is released under the
* version 2 of the GNU General Public License. PlasmaSDO™ was developed by
* TerraMeta Software, Inc.
*
* Copyright (c) 2013, TerraMeta Software, Inc. All rights reserved.
*
* General License information can be found below.
*
* This distribution may include materials developed by third
* parties. For license and attribution notices for these
* materials, please refer to the documentation that accompanies
* this distribution (see the "Licenses for Third-Party Components"
* appendix) or view the online documentation at
*
* This class is not intended for direct usage, but is
* used by the Jaxen engine during evaluation. Use {@link MetaDataXPath}
* to parse an XPath against a {@link commonj.sdo.Type} graph.
*
*
* @see XPath
* @see commonj.sdo.Type
* @see commonj.sdo.Property
*/
public class MetaDataNavigator extends DefaultNavigator implements NamedAccessNavigator
{
private static final long serialVersionUID = -1636727587303584165L;
private static Log log = LogFactory.getFactory().getInstance(MetaDataNavigator.class);
public MetaDataNavigator() {
}
public boolean isElement(Object obj)
{
return obj instanceof XPathType;
}
public boolean isComment(Object obj)
{
return false;
}
public boolean isText(Object obj)
{
return false;
}
public boolean isAttribute(Object obj)
{
return obj instanceof XPathProperty;
}
public boolean isProcessingInstruction(Object obj)
{
return false;
}
public boolean isDocument(Object obj)
{
return false;
}
public boolean isNamespace(Object obj)
{
return false;
}
public String getElementName(Object obj)
{
XPathType elem = (XPathType) obj;
return elem.getType().getName();
}
public String getElementNamespaceUri(Object obj)
{
XPathType elem = (XPathType) obj;
String uri = elem.getType().getURI();
if ( uri != null && uri.length() == 0 )
return null;
else
return uri;
}
public String getAttributeName(Object obj)
{
XPathProperty attr = (XPathProperty) obj;
return attr.getProperty().getName();
}
public String getAttributeNamespaceUri(Object obj)
{
XPathProperty attr = (XPathProperty) obj;
String uri = attr.getProperty().getType().getURI();
if ( uri != null && uri.length() == 0 )
return null;
else
return uri;
}
/**
* @param contextNode the context node
* @see org.jaxen.DefaultNavigator#getChildAxisIterator(java.lang.Object)
*/
@SuppressWarnings("unchecked")
public Iterator getChildAxisIterator(Object contextNode)
{
throw new IllegalArgumentException("unexpected instance, "
+ contextNode.getClass().getName());
/*
if ( contextNode instanceof XPathProperty )
{
XPathProperty contextProperty = (XPathProperty)contextNode;
Property property = (Property)contextProperty.getProperty();
Object target = contextProperty.getSource().get(property);
if (target != null) {
if (target instanceof List) {
return ((List)target).iterator();
}
else
return new SingleObjectIterator(
new XPathDataValue(target,
contextProperty.getSource(), property));
}
else {
return new SingleObjectIterator(
new XPathDataValue(null,
contextProperty.getSource(), property));
}
}
*/
}
/**
* Retrieves an Iterator over the child elements that
* match the supplied local name and namespace URI.
*
* @param contextNode the origin context node
* @param localName the local name of the children to return, always present
* @param namespacePrefix ignored; prefixes are not used when matching in XPath
* @param namespaceURI the URI of the namespace of the children to return
* @return an Iterator that traverses the named children, or null if none
*/
@SuppressWarnings("unchecked")
public Iterator getChildAxisIterator(
Object contextNode, String localName, String namespacePrefix, String namespaceURI) {
if ( contextNode instanceof Type ) // its the root
{
Type source = (Type)contextNode;
return getChildResult(source, localName);
}
else if (contextNode instanceof XPathType) {
XPathType contextAdapter = (XPathType)contextNode;
Type source = contextAdapter.getType();
return getChildResult(source, localName);
}
else
throw new IllegalArgumentException("unexpected instance, "
+ contextNode.getClass().getName());
}
@SuppressWarnings("unchecked")
private Iterator getChildResult(Type source, String localName) {
String propertyName = localName;
int indexPosition = localName.indexOf(".");
int index = 0;
if (indexPosition >= 0) {
propertyName = localName.substring(0, indexPosition);
try {
index = Integer.parseInt(localName.substring(indexPosition+1));
}
catch (NumberFormatException e) {
throw new IllegalArgumentException(localName, e);
}
}
// Note: must use 'findProperty' rather than getProperty here to support descendant search
// for any data object (element in XPATH XML land) with the
// desired property. E.g. for "Data Graph" bookstore/catalog/book
// for query bookstore.get("//book") where book is not a property of bookstore
// but of catalog, yet we want to search for it anywhere under the root.
Property sourceProp = ((PlasmaType)source).findProperty(propertyName);
if (sourceProp == null)
return JaxenConstants.EMPTY_ITERATOR;
if (!sourceProp.isMany() && indexPosition >= 0)
throw new IllegalArgumentException("index specified for singular property, "
+ source.getURI() + "#" + source.getName()
+ "." + propertyName);
if (sourceProp.getType().isDataType()) { // abort traversal
return new SingleObjectIterator(
new XPathProperty(sourceProp, source, sourceProp));
}
else {
Type targetType = sourceProp.getType();
return new SingleObjectIterator(
new XPathType(targetType, source, sourceProp));
}
}
@SuppressWarnings("unchecked")
public Iterator getNamespaceAxisIterator(Object contextNode)
{
return JaxenConstants.EMPTY_ITERATOR;
}
@SuppressWarnings("unchecked")
public Iterator getParentAxisIterator(Object contextNode)
{
return JaxenConstants.EMPTY_ITERATOR;
}
@SuppressWarnings("unchecked")
public Iterator getAttributeAxisIterator(Object contextNode)
{
if ( ! ( contextNode instanceof XPathType ) )
{
return JaxenConstants.EMPTY_ITERATOR;
}
XPathType elem = (XPathType) contextNode;
return elem.getType().getProperties().iterator();
}
/**
* Retrieves an Iterator over the attribute elements that
* match the supplied name.
*
* @param contextNode the origin context node
* @param localName the local name of the attributes to return, always present
* @param namespacePrefix the prefix of the namespace of the attributes to return
* @param namespaceURI the URI of the namespace of the attributes to return
* @return an Iterator that traverses the named attributes, not null
*/
@SuppressWarnings("unchecked")
public Iterator getAttributeAxisIterator(
Object contextNode, String localName, String namespacePrefix, String namespaceURI) {
if ( contextNode instanceof XPathType ) {
XPathType adapter = (XPathType)contextNode;
Property prop = adapter.getType().getProperty(localName);
if (prop.getType().isDataType()) {
return new SingleObjectIterator(
new XPathProperty(prop, adapter.getSource(),
adapter.getSourceProperty()));
}
else {
Type targetType = prop.getType();
return new SingleObjectIterator(
new XPathType(targetType, adapter.getSource(), prop));
}
}
return JaxenConstants.EMPTY_ITERATOR;
}
/** Returns a parsed form of the given XPath string, which will be suitable
* for queries on Data Graph documents.
*/
public XPath parseXPath (String xpath) throws SAXPathException
{
return new MetaDataXPath(xpath);
}
public Object getDocumentNode(Object contextNode)
{
XPathType type = null;
if ( contextNode instanceof XPathType ) // its the root
{
type = (XPathType)contextNode;
}
return type;
}
public String getElementQName(Object obj)
{
XPathType elem = (XPathType) obj;
//String prefix = elem.getNamespacePrefix();
return elem.getType().getURI() + "#" + elem.getType().getName();
}
public String getAttributeQName(Object obj)
{
XPathProperty adapter = (XPathProperty)obj;
return adapter.getProperty().getName();
}
public String getNamespaceStringValue(Object obj)
{
return obj.toString();
}
public String getNamespacePrefix(Object obj)
{
return obj.toString();
}
public String getTextStringValue(Object obj)
{
return obj.toString();
}
public String getAttributeStringValue(Object obj)
{
XPathProperty adapter = (XPathProperty)obj;
return adapter.getProperty().getName();
}
public String getElementStringValue(Object obj)
{
return obj.toString();
}
public String getProcessingInstructionTarget(Object obj)
{
return null;
}
public String getProcessingInstructionData(Object obj)
{
return null;
}
public String getCommentStringValue(Object obj)
{
return null;
}
public String translateNamespacePrefixToUri(String prefix, Object context)
{
XPathType element = null;
if ( context instanceof XPathType )
{
element = (XPathType) context;
return element.getType().getURI();
}
return null;
}
public Object getDocument(String url) throws FunctionCallException
{
throw new UnsupportedOperationException();
}
}
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