org.plasma.query.xpath.QueryPathNavigator 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.
*
*
* @see XPath
*/
public class QueryPathNavigator extends DefaultNavigator implements NamedAccessNavigator
{
private static final long serialVersionUID = -1636727587303584165L;
private static Log log = LogFactory.getFactory().getInstance(QueryPathNavigator.class);
private QueryXPath xpath;
public QueryPathNavigator() {
}
public QueryPathNavigator(QueryXPath xpath) {
this.xpath = xpath;
}
public QueryXPath getXpath() {
return xpath;
}
public void setXpath(QueryXPath xpath) {
this.xpath = xpath;
}
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;
}
/**
* Where the given context node is a SDO Property,
* gets the actual value of the property wrapped
* in a CoreXPathValue and Iterator. This wrapper approach
* supports subsequent navigator tests for isText() where
* we want any Data Object value to be thought of as XML text
* and be returned. In particular we want null values to be returned
* so that clients can at least detect if the XPath
* was navigated successfully.
*
* @param contextNode the context node
* @see CoreXPathResult
* @see org.jaxen.DefaultNavigator#getChildAxisIterator(java.lang.Object)
*/
@SuppressWarnings("unchecked")
public Iterator getChildAxisIterator(Object contextNode)
{
if ( contextNode instanceof XPathProperty )
{
XPathProperty contextProperty = (XPathProperty)contextNode;
Property property = (Property)contextProperty.getProperty();
return new SingleObjectIterator(
new XPathProperty(property, property.getType())); // FIXME
}
else
return this.getChildResult((PlasmaType)((XPathType)contextNode).getType());
}
/**
* 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 PlasmaType ) // its the root
{
PlasmaType source = (PlasmaType)contextNode;
return getChildResult(source, localName);
}
else if (contextNode instanceof XPathType) {
XPathType contextAdapter = (XPathType)contextNode;
PlasmaType source = (PlasmaType)contextAdapter.getType();
return getChildResult(source, localName);
}
else if ( contextNode instanceof XPathProperty )
{
XPathProperty contextProperty = (XPathProperty)contextNode;
Property property = (Property)contextProperty.getProperty();
return new SingleObjectIterator(
new XPathProperty(property, property.getType())); // FIXME
}
else
throw new IllegalArgumentException("unexpected instance, "
+ contextNode.getClass().getName());
}
@SuppressWarnings("unchecked")
private Iterator getChildResult(PlasmaType 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 prop = source.findProperty(propertyName);
if (prop == null)
return JaxenConstants.EMPTY_ITERATOR;
if (prop.getType().isDataType()) { // abort traversal
return new SingleObjectIterator(
new XPathProperty(prop, source));
}
if (!prop.isMany() && indexPosition >= 0)
throw new IllegalArgumentException("index specified for singular property, "
+ source.getURI() + "#" + source.getName()
+ "." + propertyName);
return new SingleObjectIterator(
new XPathType(prop.getType(), source, prop));
}
@SuppressWarnings("unchecked")
private Iterator getChildResult(PlasmaType source)
{
List children = new ArrayList();
return children.iterator();
}
@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);
//this.contextProperty = this.contextType.getProperty(localName);
//Namespace namespace = (namespaceURI == null ? Namespace.NO_NAMESPACE :
// Namespace.getNamespace(namespacePrefix, namespaceURI));
// for propertry results sourceProperty=target
return new SingleObjectIterator(new XPathProperty(prop,
null, prop)); //FIXME
}
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
{
QueryXPath queryXPath = new QueryXPath(xpath, this);
return queryXPath;
}
public Object getDocumentNode(Object contextNode)
{
PlasmaType type = null;
if ( contextNode instanceof PlasmaType ) // its the root
{
type = (PlasmaType)contextNode;
}
else if (contextNode instanceof XPathType) {
type = (PlasmaType)((XPathType) contextNode).getType();
}
return type;
}
public String getElementQName(Object obj)
{
PlasmaType elem = (PlasmaType) obj;
//String prefix = elem.getNamespacePrefix();
return elem.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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