org.apache.axiom.om.xpath.DocumentNavigator Maven / Gradle / Ivy
/*
* 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.axiom.om.xpath;
import org.apache.axiom.om.OMAttribute;
import org.apache.axiom.om.OMComment;
import org.apache.axiom.om.OMContainer;
import org.apache.axiom.om.OMDocument;
import org.apache.axiom.om.OMElement;
import org.apache.axiom.om.OMNamespace;
import org.apache.axiom.om.OMNode;
import org.apache.axiom.om.OMProcessingInstruction;
import org.apache.axiom.om.OMText;
import org.apache.axiom.om.OMXMLBuilderFactory;
import org.jaxen.BaseXPath;
import org.jaxen.DefaultNavigator;
import org.jaxen.FunctionCallException;
import org.jaxen.JaxenConstants;
import org.jaxen.UnsupportedAxisException;
import org.jaxen.XPath;
import org.jaxen.saxpath.SAXPathException;
import org.jaxen.util.SingleObjectIterator;
import java.io.FileInputStream;
import java.io.IOException;
import java.io.InputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashSet;
import java.util.Iterator;
import java.util.List;
import java.util.Set;
public class DocumentNavigator extends DefaultNavigator {
private static final long serialVersionUID = 7325116153349780805L;
/**
* Returns a parsed form of the given xpath string, which will be suitable for queries on
* documents that use the same navigator as this one.
*
* @param xpath the XPath expression
* @return Returns a new XPath expression object.
* @throws SAXPathException if the string is not a syntactically correct XPath expression
* @see XPath
*/
@Override
public XPath parseXPath(String xpath) throws SAXPathException {
return new BaseXPath(xpath, this);
}
/**
* Retrieves the namespace URI of the given element node.
*
* @param object the context element node
* @return Returns the namespace URI of the element node.
*/
@Override
public String getElementNamespaceUri(Object object) {
OMElement attr = (OMElement) object;
return attr.getQName().getNamespaceURI();
}
/**
* Retrieves the name of the given element node.
*
* @param object the context element node
* @return Returns the name of the element node.
*/
@Override
public String getElementName(Object object) {
return ((OMElement) object).getLocalName();
}
/**
* Retrieves the QName of the given element node.
*
* @param object the context element node
* @return Returns the QName of the element node.
*/
@Override
public String getElementQName(Object object) {
OMElement attr = (OMElement) object;
String prefix = null;
OMNamespace namespace = attr.getNamespace();
if (namespace != null) {
prefix = namespace.getPrefix();
}
if (prefix == null || "".equals(prefix)) {
return attr.getLocalName();
}
return prefix + ":" + namespace.getNamespaceURI();
}
/**
* Retrieves the namespace URI of the given attribute node.
*
* @param object the context attribute node
* @return Returns the namespace URI of the attribute node.
*/
@Override
public String getAttributeNamespaceUri(Object object) {
OMAttribute attr = (OMAttribute) object;
return attr.getQName().getNamespaceURI();
}
/**
* Retrieves the name of the given attribute node.
*
* @param object the context attribute node
* @return Returns the name of the attribute node.
*/
@Override
public String getAttributeName(Object object) {
return ((OMAttribute) object).getLocalName();
}
/**
* Retrieves the QName of the given attribute node.
*
* @param object the context attribute node
* @return Returns the qualified name of the attribute node.
*/
@Override
public String getAttributeQName(Object object) {
OMAttribute attr = (OMAttribute) object;
String prefix = attr.getNamespace().getPrefix();
if (prefix == null || "".equals(prefix)) {
return attr.getLocalName();
}
return prefix + ":" + attr.getLocalName();
}
/**
* Returns whether the given object is a document node. A document node is the node that is
* selected by the xpath expression /.
*
* @param object the object to test
* @return Returns true if the object is a document node, else false
* .
*/
@Override
public boolean isDocument(Object object) {
return object instanceof OMDocument;
}
/**
* Returns whether the given object is an element node.
*
* @param object the object to test
* @return Returns true if the object is an element node, else false
* .
*/
@Override
public boolean isElement(Object object) {
return object instanceof OMElement;
}
/**
* Returns whether the given object is an attribute node.
*
* @param object the object to test
* @return Returns true if the object is an attribute node, else false
* .
*/
@Override
public boolean isAttribute(Object object) {
return object instanceof OMAttribute;
}
/**
* Returns whether the given object is a namespace node.
*
* @param object the object to test
* @return Returns true if the object is a namespace node, else false
* .
*/
@Override
public boolean isNamespace(Object object) {
return object instanceof OMNamespace;
}
/**
* Returns whether the given object is a comment node.
*
* @param object the object to test
* @return Returns true if the object is a comment node, else false .
*/
@Override
public boolean isComment(Object object) {
return (object instanceof OMComment);
}
/**
* Returns whether the given object is a text node.
*
* @param object the object to test
* @return Returns true if the object is a text node, else false .
*/
@Override
public boolean isText(Object object) {
return (object instanceof OMText);
}
/**
* Returns whether the given object is a processing-instruction node.
*
* @param object the object to test
* @return Returns true if the object is a processing-instruction node, else
* false .
*/
@Override
public boolean isProcessingInstruction(Object object) {
return (object instanceof OMProcessingInstruction);
}
/**
* Retrieves the string-value of a comment node. This may be the empty string if the comment is
* empty, but must not be null.
*
* @param object the comment node
* @return Returns the string-value of the node.
*/
@Override
public String getCommentStringValue(Object object) {
return ((OMComment) object).getValue();
}
/**
* Retrieves the string-value of an element node. This may be the empty string if the element is
* empty, but must not be null.
*
* @param object the comment node.
* @return Returns the string-value of the node.
*/
@Override
public String getElementStringValue(Object object) {
if (isElement(object)) {
return getStringValue((OMElement) object, new StringBuffer())
.toString();
}
return null;
}
private StringBuffer getStringValue(OMNode node, StringBuffer buffer) {
if (isText(node)) {
buffer.append(((OMText) node).getText());
} else if (node instanceof OMElement) {
Iterator children = ((OMElement) node).getChildren();
while (children.hasNext()) {
getStringValue(children.next(), buffer);
}
}
return buffer;
}
/**
* Retrieves the string-value of an attribute node. This should be the XML 1.0 normalized
* attribute value. This may be the empty string but must not be null.
*
* @param object the attribute node
* @return Returns the string-value of the node.
*/
@Override
public String getAttributeStringValue(Object object) {
return ((OMAttribute) object).getAttributeValue();
}
/**
* Retrieves the string-value of a namespace node. This is generally the namespace URI. This may
* be the empty string but must not be null.
*
* @param object the namespace node
* @return Returns the string-value of the node.
*/
@Override
public String getNamespaceStringValue(Object object) {
return ((OMNamespace) object).getNamespaceURI();
}
/**
* Retrieve the string-value of a text node. This must not be null and should not be the empty
* string. The XPath data model does not allow empty text nodes.
*
* @param object the text node
* @return Returns the string-value of the node.
*/
@Override
public String getTextStringValue(Object object) {
return ((OMText) object).getText();
}
/**
* Retrieves the namespace prefix of a namespace node.
*
* @param object the namespace node
* @return Returns the prefix associated with the node.
*/
@Override
public String getNamespacePrefix(Object object) {
return ((OMNamespace) object).getPrefix();
}
/**
* Retrieves an Iterator matching the child XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the child axis are not supported by this
* object model
*/
@Override
public Iterator getChildAxisIterator(Object contextNode) throws UnsupportedAxisException {
if (contextNode instanceof OMContainer) {
return ((OMContainer) contextNode).getChildren();
}
return JaxenConstants.EMPTY_ITERATOR;
}
@Override
public Iterator getDescendantAxisIterator(Object object) throws UnsupportedAxisException {
//TODO: Fix this better?
return super.getDescendantAxisIterator(object);
}
/**
* Retrieves an Iterator matching the attribute XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the attribute axis are not supported by
* this object model
*/
@Override
public Iterator getAttributeAxisIterator(Object contextNode) throws UnsupportedAxisException {
if (isElement(contextNode)) {
return ((OMElement) contextNode).getAllAttributes();
} else {
return JaxenConstants.EMPTY_ITERATOR;
}
}
/**
* Retrieves an Iterator matching the namespace XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the namespace axis are not supported by
* this object model
*/
@Override
public Iterator getNamespaceAxisIterator(Object contextNode) throws UnsupportedAxisException {
if (!(contextNode instanceof OMContainer &&
contextNode instanceof OMElement)) {
return JaxenConstants.EMPTY_ITERATOR;
}
OMContainer omContextNode = (OMContainer) contextNode;
List nsList = new ArrayList();
Set prefixes = new HashSet();
for (OMContainer context = omContextNode;
context != null && !(context instanceof OMDocument);
context = ((OMElement) context).getParent()) {
OMElement element = (OMElement) context;
List declaredNS = new ArrayList();
Iterator i = element.getAllDeclaredNamespaces();
while (i != null && i.hasNext()) {
declaredNS.add(i.next());
}
declaredNS.add(element.getNamespace());
for (Iterator iter = element.getAllAttributes();
iter != null && iter.hasNext();) {
OMAttribute attr = iter.next();
OMNamespace namespace = attr.getNamespace();
if (namespace != null) {
declaredNS.add(namespace);
}
}
for (OMNamespace namespace : declaredNS) {
if (namespace != null) {
String prefix = namespace.getPrefix();
if (prefix != null && !prefixes.contains(prefix)) {
prefixes.add(prefix);
nsList.add(new OMNamespaceEx(namespace, context));
}
}
}
}
nsList.add(
new OMNamespaceEx(
omContextNode.getOMFactory().createOMNamespace(
"http://www.w3.org/XML/1998/namespace",
"xml"),
omContextNode));
return nsList.iterator();
}
/**
* Retrieves an Iterator matching the self xpath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the self axis are not supported by this
* object model
*/
@Override
public Iterator getSelfAxisIterator(Object contextNode) throws UnsupportedAxisException {
//TODO: Fix this better?
return super.getSelfAxisIterator(contextNode);
}
/**
* Retrieves an Iterator matching the descendant-or-self XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the descendant-or-self axis are not
* supported by this object model
*/
@Override
public Iterator getDescendantOrSelfAxisIterator(Object contextNode)
throws UnsupportedAxisException {
//TODO: Fix this better?
return super.getDescendantOrSelfAxisIterator(contextNode);
}
/**
* Retrieves an Iterator matching the ancestor-or-self XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the ancestor-or-self axis are not
* supported by this object model
*/
@Override
public Iterator getAncestorOrSelfAxisIterator(Object contextNode)
throws UnsupportedAxisException {
//TODO: Fix this better?
return super.getAncestorOrSelfAxisIterator(contextNode);
}
/**
* Retrieves an Iterator matching the parent XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the parent axis are not supported by
* this object model
*/
@Override
public Iterator getParentAxisIterator(Object contextNode) throws UnsupportedAxisException {
if (contextNode instanceof OMNode) {
return new SingleObjectIterator(((OMNode) contextNode).getParent());
} else if (contextNode instanceof OMNamespaceEx) {
return new SingleObjectIterator(
((OMNamespaceEx) contextNode).getParent());
} else if (contextNode instanceof OMAttribute) {
return new SingleObjectIterator(
((OMAttribute) contextNode).getOwner());
}
return JaxenConstants.EMPTY_ITERATOR;
}
/**
* Retrieves an Iterator matching the ancestor XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the ancestor axis are not supported by
* this object model
*/
@Override
public Iterator getAncestorAxisIterator(Object contextNode) throws UnsupportedAxisException {
//TODO: Fix this better?
return super.getAncestorAxisIterator(contextNode);
}
/**
* Retrieves an Iterator matching the following-sibling XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the following-sibling axis are not
* supported by this object model
*/
@Override
public Iterator getFollowingSiblingAxisIterator(Object contextNode)
throws UnsupportedAxisException {
List list = new ArrayList();
if (contextNode != null && contextNode instanceof OMNode) {
OMNode node = (OMNode)contextNode;
while (true) {
node = node.getNextOMSibling();
if (node != null) {
list.add(node);
} else {
break;
}
}
}
return list.iterator();
}
/**
* Retrieves an Iterator matching the preceding-sibling XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the preceding-sibling axis are not
* supported by this object model
*/
@Override
public Iterator getPrecedingSiblingAxisIterator(Object contextNode)
throws UnsupportedAxisException {
List list = new ArrayList();
if (contextNode != null && contextNode instanceof OMNode) {
OMNode node = (OMNode)contextNode;
while (true) {
node = node.getPreviousOMSibling();
if (node != null) {
list.add(node);
} else {
break;
}
}
}
return list.iterator();
}
/**
* Retrieves an Iterator matching the following XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the following axis are not supported by
* this object model
*/
@Override
public Iterator getFollowingAxisIterator(Object contextNode) throws UnsupportedAxisException {
//TODO: Fix this better?
return super.getFollowingAxisIterator(contextNode);
}
/**
* Retrieves an Iterator matching the preceding XPath axis.
*
* @param contextNode the original context node
* @return Returns an Iterator capable of traversing the axis, not null.
* @throws UnsupportedAxisException if the semantics of the preceding axis are not supported by
* this object model
*/
@Override
public Iterator getPrecedingAxisIterator(Object contextNode) throws UnsupportedAxisException {
//TODO: Fix this better?
return super.getPrecedingAxisIterator(contextNode);
}
/**
* Loads a document from the given URI.
*
* @param uri the URI of the document to load
* @return Returns the document.
* @throws FunctionCallException if the document could not be loaded
*/
@Override
public Object getDocument(String uri)
throws FunctionCallException {
InputStream in = null;
try {
if (uri.indexOf(':') == -1) {
in = new FileInputStream(uri);
} else {
URL url = new URL(uri);
in = url.openStream();
}
return OMXMLBuilderFactory.createOMBuilder(in).getDocument();
} catch (Exception e) {
if (in != null) {
try {
in.close();
} catch (IOException ex) {
// Ignore
}
}
throw new FunctionCallException(e);
}
}
/**
* Returns the element whose ID is given by elementId. If no such element exists, returns null.
* Attributes with the name "ID" are not of type ID unless so defined. Implementations that do
* not know whether attributes are of type ID or not are expected to return null.
*
* @param contextNode a node from the document in which to look for the id
* @param elementId id to look for
* @return Returns element whose ID is given by elementId, or null if no such element exists in
* the document or if the implementation does not know about attribute types.
*/
@Override
public Object getElementById(Object contextNode, String elementId) {
//TODO: Fix this better?
return super.getElementById(contextNode, elementId);
}
/**
* Returns the document node that contains the given context node.
*
* @param contextNode the context node
* @return Returns the document of the context node.
* @see #isDocument(Object)
*/
@Override
public Object getDocumentNode(Object contextNode) {
if (contextNode instanceof OMDocument) {
return contextNode;
}
OMContainer parent = ((OMNode) contextNode).getParent();
if (parent == null) {
// this node doesn't have a parent Document. So return the document element itself
return contextNode;
} else {
return getDocumentNode(parent);
}
}
/**
* Translates a namespace prefix to a namespace URI, possibly considering a particular
* element node.
*
* Strictly speaking, prefix-to-URI translation should occur irrespective of any element in the
* document. This method is provided to allow a non-conforming ease-of-use enhancement.
*
* @param prefix the prefix to translate
* @param element the element to consider during translation
* @return Returns the namespace URI associated with the prefix.
*/
@Override
public String translateNamespacePrefixToUri(String prefix, Object element) {
//TODO: Fix this better?
return super.translateNamespacePrefixToUri(prefix, element);
}
/**
* Retrieves the target of a processing-instruction.
*
* @param object the context processing-instruction node
* @return Returns the target of the processing-instruction node.
*/
@Override
public String getProcessingInstructionTarget(Object object) {
return ((OMProcessingInstruction) object).getTarget();
}
/**
* Retrieves the data of a processing-instruction.
*
* @param object the context processing-instruction node
* @return Returns the data of the processing-instruction node.
*/
@Override
public String getProcessingInstructionData(Object object) {
return ((OMProcessingInstruction) object).getValue();
}
/**
* Returns a number that identifies the type of node that the given object represents in this
* navigator. See org.jaxen.pattern.Pattern
*
* @param node ????
* @return Returns short.
*/
@Override
public short getNodeType(Object node) {
//TODO: Fix this better?
return super.getNodeType(node);
}
/**
* Returns the parent of the given context node.
*
* The parent of any node must either be a document node or an element node.
*
* @param contextNode the context node
* @return Returns the parent of the context node, or null if this is a document node.
* @throws UnsupportedAxisException if the parent axis is not supported by the model
* @see #isDocument
* @see #isElement
*/
@Override
public Object getParentNode(Object contextNode) throws UnsupportedAxisException {
if (contextNode == null ||
contextNode instanceof OMDocument) {
return null;
} else if (contextNode instanceof OMAttribute) {
return ((OMAttribute) contextNode).getOwner();
} else if (contextNode instanceof OMNamespaceEx) {
return ((OMNamespaceEx) contextNode).getParent();
}
return ((OMNode) contextNode).getParent();
}
class OMNamespaceEx implements OMNamespace {
final OMNamespace originalNsp;
final OMContainer parent;
OMNamespaceEx(OMNamespace nsp, OMContainer parent) {
originalNsp = nsp;
this.parent = parent;
}
@Override
public boolean equals(String uri, String prefix) {
return originalNsp.equals(uri, prefix);
}
@Override
public String getPrefix() {
return originalNsp.getPrefix();
}
@Override
public String getName() {
return originalNsp.getNamespaceURI();
}
@Override
public String getNamespaceURI() {
return originalNsp.getNamespaceURI();
}
public OMContainer getParent() {
return parent;
}
}
}
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