/*
* Copyright 2005-2014 the original author or authors.
*
* Licensed 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.springframework.xml.xpath;
import java.util.ArrayList;
import java.util.List;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import org.jaxen.JaxenException;
import org.jaxen.SimpleNamespaceContext;
import org.jaxen.XPath;
import org.jaxen.dom.DOMXPath;
import org.w3c.dom.DOMException;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* Implementation of {@link XPathOperations} that uses Jaxen.
*
* <p>Namespaces can be set using the {@code namespaces} property.
*
* @author Arjen Poutsma
* @see <a href="http://www.jaxen.org/">Jaxen</a>
* @since 1.0.0
*/
public class JaxenXPathTemplate extends AbstractXPathTemplate {
@Override
public boolean evaluateAsBoolean(String expression, Source context) throws XPathException {
try {
XPath xpath = createXPath(expression);
Element element = getRootElement(context);
return xpath.booleanValueOf(element);
}
catch (JaxenException ex) {
throw new XPathException("Could not evaluate XPath expression [" + expression + "]", ex);
}
catch (TransformerException ex) {
throw new XPathException("Could not transform context to DOM Node", ex);
}
}
@Override
public Node evaluateAsNode(String expression, Source context) throws XPathException {
try {
XPath xpath = createXPath(expression);
Element element = getRootElement(context);
return (Node) xpath.selectSingleNode(element);
}
catch (JaxenException ex) {
throw new XPathException("Could not evaluate XPath expression [" + expression + "]", ex);
}
catch (TransformerException ex) {
throw new XPathException("Could not transform context to DOM Node", ex);
}
}
@Override
@SuppressWarnings("unchecked")
public List<Node> evaluateAsNodeList(String expression, Source context) throws XPathException {
try {
XPath xpath = createXPath(expression);
Element element = getRootElement(context);
return xpath.selectNodes(element);
}
catch (JaxenException ex) {
throw new XPathException("Could not evaluate XPath expression [" + expression + "]", ex);
}
catch (TransformerException ex) {
throw new XPathException("Could not transform context to DOM Node", ex);
}
}
@Override
public double evaluateAsDouble(String expression, Source context) throws XPathException {
try {
XPath xpath = createXPath(expression);
Element element = getRootElement(context);
return xpath.numberValueOf(element).doubleValue();
}
catch (JaxenException ex) {
throw new XPathException("Could not evaluate XPath expression [" + expression + "]", ex);
}
catch (TransformerException ex) {
throw new XPathException("Could not transform context to DOM Node", ex);
}
}
@Override
public String evaluateAsString(String expression, Source context) throws XPathException {
try {
XPath xpath = createXPath(expression);
Element element = getRootElement(context);
return xpath.stringValueOf(element);
}
catch (JaxenException ex) {
throw new XPathException("Could not evaluate XPath expression [" + expression + "]", ex);
}
catch (TransformerException ex) {
throw new XPathException("Could not transform context to DOM Node", ex);
}
}
@Override
public <T> T evaluateAsObject(String expression, Source context, NodeMapper<T> nodeMapper) throws XPathException {
try {
XPath xpath = createXPath(expression);
Element element = getRootElement(context);
Node node = (Node) xpath.selectSingleNode(element);
if (node != null) {
try {
return nodeMapper.mapNode(node, 0);
}
catch (DOMException ex) {
throw new XPathException("Mapping resulted in DOMException", ex);
}
}
else {
return null;
}
}
catch (JaxenException ex) {
throw new XPathException("Could not evaluate XPath expression [" + expression + "]", ex);
}
catch (TransformerException ex) {
throw new XPathException("Could not transform context to DOM Node", ex);
}
}
@Override
public <T> List<T> evaluate(String expression, Source context, NodeMapper<T> nodeMapper) throws XPathException {
try {
XPath xpath = createXPath(expression);
Element element = getRootElement(context);
List<?> nodes = xpath.selectNodes(element);
List<T> results = new ArrayList<T>(nodes.size());
for (int i = 0; i < nodes.size(); i++) {
Node node = (Node) nodes.get(i);
try {
results.add(nodeMapper.mapNode(node, i));
}
catch (DOMException ex) {
throw new XPathException("Mapping resulted in DOMException", ex);
}
}
return results;
}
catch (JaxenException ex) {
throw new XPathException("Could not evaluate XPath expression [" + expression + "]", ex);
}
catch (TransformerException ex) {
throw new XPathException("Could not transform context to DOM Node", ex);
}
}
private XPath createXPath(String expression) throws JaxenException {
XPath xpath = new DOMXPath(expression);
if (getNamespaces() != null && !getNamespaces().isEmpty()) {
xpath.setNamespaceContext(new SimpleNamespaceContext(getNamespaces()));
}
return xpath;
}
}