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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.cxf.jaxrs.ext.xml;
import java.io.InputStream;
import java.lang.reflect.Array;
import java.net.URI;
import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.Map;
import javax.xml.XMLConstants;
import javax.xml.bind.JAXBContext;
import javax.xml.bind.Unmarshaller;
import javax.xml.bind.annotation.XmlRootElement;
import javax.xml.namespace.NamespaceContext;
import javax.xml.namespace.QName;
import javax.xml.stream.XMLStreamException;
import javax.xml.transform.Source;
import javax.xml.transform.dom.DOMSource;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import javax.xml.xpath.XPathFactoryConfigurationException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
import org.apache.cxf.common.jaxb.JAXBUtils;
import org.apache.cxf.helpers.CastUtils;
import org.apache.cxf.interceptor.Fault;
import org.apache.cxf.jaxrs.provider.JAXBElementProvider;
import org.apache.cxf.jaxrs.utils.InjectionUtils;
import org.apache.cxf.staxutils.StaxUtils;
/**
* Utility class for manipulating XML response using XPath and XSLT
*
*/
public class XMLSource {
private static final String XML_NAMESPACE = "http://www.w3.org/XML/1998/namespace";
private InputStream stream;
private Document doc;
public XMLSource(InputStream is) {
stream = is;
}
/**
* Allows for multiple queries against the same stream by buffering to DOM
*/
public void setBuffering() {
try {
doc = StaxUtils.read(stream);
stream = null;
} catch (XMLStreamException e) {
throw new Fault(e);
}
}
/**
* Find the matching XML node and convert it into an instance of the provided class.
* The default JAXB MessageBodyReader is currently used in case of non-primitive types.
*
* @param expression XPath expression
* @param cls class of the node
* @return the instance representing the matching node
*/
public T getNode(String expression, Class cls) {
return getNode(expression, CastUtils.cast(Collections.emptyMap(), String.class, String.class), cls);
}
/**
* Find the matching XML node and convert it into an instance of the provided class.
* The default JAXB MessageBodyReader is currently used in case of non-primitive types.
*
* @param expression XPath expression
* @param namespaces the namespaces map, prefixes which are used in the XPath expression
* are the keys, namespace URIs are the values; note, the prefixes do not have to match
* the actual ones used in the XML instance.
* @param cls class of the node
* @return the instance representing the matching node
*/
@SuppressWarnings("unchecked")
public T getNode(String expression, Map namespaces, Class cls) {
Object obj = evaluate(expression, namespaces, XPathConstants.NODE);
if (obj == null) {
return null;
}
if (obj instanceof Node) {
Node node = (Node)obj;
if (cls.isPrimitive() || cls == String.class) {
return (T)readPrimitiveValue(node, cls);
}
return readNode(node, cls);
}
return cls.cast(evaluate(expression, namespaces, XPathConstants.STRING));
}
/**
* Find the list of matching XML nodes and convert them into
* an array of instances of the provided class.
* The default JAXB MessageBodyReader is currently used in case of non-primitive types.
*
* @param expression XPath expression
* @param cls class of the node
* @return the array of instances representing the matching nodes
*/
public T[] getNodes(String expression, Class cls) {
return getNodes(expression, CastUtils.cast(Collections.emptyMap(), String.class, String.class), cls);
}
/**
* Find the list of matching XML nodes and convert them into
* an array of instances of the provided class.
* The default JAXB MessageBodyReader is currently used in case of non-primitive types.
*
* @param expression XPath expression
* @param namespaces the namespaces map, prefixes which are used in the XPath expression
* are the keys, namespace URIs are the values; note, the prefixes do not have to match
* the actual ones used in the XML instance.
* @param cls class of the node
* @return the array of instances representing the matching nodes
*/
@SuppressWarnings("unchecked")
public T[] getNodes(String expression, Map namespaces, Class cls) {
NodeList nodes = (NodeList)evaluate(expression, namespaces, XPathConstants.NODESET);
if (nodes == null || nodes.getLength() == 0) {
return null;
}
T[] values = (T[])Array.newInstance(cls, nodes.getLength());
for (int i = 0; i < nodes.getLength(); i++) {
Node node = nodes.item(i);
if (InjectionUtils.isPrimitive(cls)) {
values[i] = (T)readPrimitiveValue(node, cls);
} else {
values[i] = readNode(node, cls);
}
}
return values;
}
/**
* Find an attribute or text node representing
* an absolute or relative link and convert it to URI
* @param expression the XPath expression
* @return the link
*/
public URI getLink(String expression) {
return getLink(expression, CastUtils.cast(Collections.emptyMap(), String.class, String.class));
}
/**
* Find an attribute or text node representing
* an absolute or relative link and convert it to URI
* @param expression the XPath expression
* @param namespaces the namespaces map, prefixes which are used in the XPath expression
* are the keys, namespace URIs are the values; note, the prefixes do not have to match
* the actual ones used in the XML instance.
* @return the link
*/
public URI getLink(String expression, Map namespaces) {
String value = getValue(expression, namespaces);
return value == null ? null : URI.create(value);
}
/**
* Find attributes or text nodes representing
* absolute or relative links and convert them to URIs
* @param expression the XPath expression
* @param namespaces the namespaces map, prefixes which are used in the XPath expression
* are the keys, namespace URIs are the values; note, the prefixes do not have to match
* the actual ones used in the XML instance.
* @return the links
*/
public URI[] getLinks(String expression, Map namespaces) {
String[] values = getValues(expression, namespaces);
if (values == null) {
return null;
}
URI[] uris = new URI[values.length];
for (int i = 0; i < values.length; i++) {
uris[i] = URI.create(values[i]);
}
return uris;
}
/**
* Returns the value of the xml:base attribute, if any.
* This can be used to calculate an absolute URI provided
* the links in the actual XML instance are relative.
*
* @return the xml:base value
*/
public URI getBaseURI() {
Map map = new LinkedHashMap<>();
map.put("xml", XML_NAMESPACE);
return getLink("/*/@xml:base", map);
}
/**
* Find the attribute or simple/text node
* @param expression the XPath expression
* @return the value of the matching node
*/
public String getValue(String expression) {
return getValue(expression, CastUtils.cast(Collections.emptyMap(), String.class, String.class));
}
/**
* Find the attribute or simple/text node
* @param expression the XPath expression
* @param namespaces the namespaces map, prefixes which are used in the XPath expression
* are the keys, namespace URIs are the values; note, the prefixes do not have to match
* the actual ones used in the XML instance.
* @return the value of the matching node
*/
public String getValue(String expression, Map namespaces) {
return getValue(expression, namespaces, String.class);
}
/**
* Find the attributes or simple/text nodes
* @param expression the XPath expression
* @return the values of the matching nodes
*/
public String[] getValues(String expression) {
return getValues(expression, CastUtils.cast(Collections.emptyMap(), String.class, String.class));
}
/**
* Find the attributes or simple/text nodes
* @param expression the XPath expression
* @param namespaces the namespaces map, prefixes which are used in the XPath expression
* are the keys, namespace URIs are the values; note, the prefixes do not have to match
* the actual ones used in the XML instance.
* @return the values of the matching nodes
*/
public String[] getValues(String expression, Map namespaces) {
return getNodes(expression, namespaces, String.class);
}
/**
* Find the attribute or simple/text node and convert the string value to the
* instance of the provided class, example, Integer.class.
* @param expression the XPath expression
* @param namespaces the namespaces map, prefixes which are used in the XPath expression
* are the keys, namespace URIs are the values; note, the prefixes do not have to match
* the actual ones used in the XML instance.
* @param cls the class of the response
* @return the value
*/
@SuppressWarnings("unchecked")
public T getValue(String expression, Map namespaces, Class cls) {
Object result = evaluate(expression, namespaces, XPathConstants.STRING);
return result == null ? null : (T)InjectionUtils.convertStringToPrimitive(result.toString(), cls);
}
private Object evaluate(String expression, Map namespaces, QName type) {
XPathFactory factory = XPathFactory.newInstance();
try {
factory.setFeature(XMLConstants.FEATURE_SECURE_PROCESSING, Boolean.TRUE);
} catch (XPathFactoryConfigurationException e) {
throw new RuntimeException(e);
}
XPath xpath = factory.newXPath();
xpath.setNamespaceContext(new NamespaceContextImpl(namespaces));
boolean releaseDoc = false;
try {
if (stream != null) {
//xalan xpath evaluate parses to a DOM via a DocumentBuilderFactory, but doesn't
//set the SecureProcessing on that. Since a DOM is always created, might as well
//do it via stax and avoid the service factory performance hits that the
//DocumentBuilderFactory will entail as well as get the extra security
//that woodstox provides
setBuffering();
releaseDoc = true;
}
return xpath.compile(expression).evaluate(doc, type);
} catch (XPathExpressionException ex) {
throw new IllegalArgumentException("Illegal XPath expression '" + expression + "'", ex);
} finally {
if (releaseDoc) {
//don't need to maintain the doc
doc = null;
}
}
}
private static class NamespaceContextImpl implements NamespaceContext {
private Map namespaces;
NamespaceContextImpl(Map namespaces) {
this.namespaces = namespaces;
}
public String getNamespaceURI(String prefix) {
return namespaces.get(prefix);
}
public String getPrefix(String namespace) {
for (Map.Entry entry : namespaces.entrySet()) {
if (entry.getValue().equals(namespace)) {
return entry.getKey();
}
}
return null;
}
public Iterator getPrefixes(String namespace) {
String prefix = namespaces.get(namespace);
if (prefix == null) {
return null;
}
return Collections.singletonList(prefix).iterator();
}
}
private Object readPrimitiveValue(Node node, Class cls) {
if (String.class == cls) {
if (node.getNodeType() == Node.ELEMENT_NODE) {
return StaxUtils.toString((Element)node);
}
return cls.cast(node.getNodeValue());
}
return InjectionUtils.convertStringToPrimitive(node.getNodeValue(), cls);
}
private T readNode(Node node, Class cls) {
if (Node.class.isAssignableFrom(cls)) {
return cls.cast(node);
}
DOMSource s = new DOMSource(node);
if (Source.class == cls || DOMSource.class == cls) {
return cls.cast(s);
}
try {
JAXBElementProvider provider = new JAXBElementProvider<>();
JAXBContext c = provider.getPackageContext(cls);
if (c == null) {
c = provider.getClassContext(cls);
}
Unmarshaller u = c.createUnmarshaller();
try {
if (cls.getAnnotation(XmlRootElement.class) != null) {
return cls.cast(u.unmarshal(s));
}
return u.unmarshal(s, cls).getValue();
} finally {
JAXBUtils.closeUnmarshaller(u);
}
} catch (Exception ex) {
throw new RuntimeException(ex);
}
}
}
