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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.tuscany.core.property;
import java.io.InputStream;
import java.net.URI;
import java.net.URL;
import java.util.ArrayList;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.xml.namespace.NamespaceContext;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.xpath.XPath;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import javax.xml.xpath.XPathFactory;
import org.apache.tuscany.core.databinding.xml.InputStream2Node;
import org.apache.tuscany.spi.databinding.extension.DOMHelper;
import org.apache.tuscany.spi.deployer.DeploymentContext;
import org.apache.tuscany.spi.loader.InvalidValueException;
import org.apache.tuscany.spi.loader.LoaderException;
import org.apache.tuscany.spi.model.ComponentDefinition;
import org.apache.tuscany.spi.model.CompositeComponentType;
import org.apache.tuscany.spi.model.Implementation;
import org.apache.tuscany.spi.model.Property;
import org.apache.tuscany.spi.model.PropertyValue;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
/**
* The property factory backed by the DataBindingframework
*/
public final class PropertyHelper {
private static final XPathFactory FACTORY = XPathFactory.newInstance();
private PropertyHelper() {
}
public static Document evaluate(NamespaceContext nsContext, Node node, String xPathExpression)
throws XPathExpressionException, ParserConfigurationException {
XPath path = FACTORY.newXPath();
if (nsContext != null) {
path.setNamespaceContext(nsContext);
} else {
path.setNamespaceContext(new DOMNamespeceContext(node));
}
XPathExpression expression = path.compile(xPathExpression);
Node result = (Node)expression.evaluate(node, XPathConstants.NODE);
if (result == null) {
return null;
}
// TODO: How to wrap the result into a Document?
Document document = DOMHelper.newDocument();
if (result instanceof Document) {
return (Document)result;
} else {
document.appendChild(document.importNode(result, true));
return document;
}
}
public static Document loadFromFile(String file, DeploymentContext deploymentContext)
throws LoaderException {
try {
URI uri = URI.create(file);
URL url = null;
if (!uri.isAbsolute()) {
url = deploymentContext.getClassLoader().getResource(file);
} else {
url = uri.toURL();
}
InputStream is = url.openStream();
try {
InputStream2Node transformer = new InputStream2Node();
return (Document)transformer.transform(is, null);
} finally {
is.close();
}
} catch (Exception e) {
throw new LoaderException(e);
}
}
@SuppressWarnings("unchecked")
public static void processProperties(CompositeComponentType<?, ?, Property<?>> parent,
ComponentDefinition<? extends Implementation<?>> componentDefinition,
DeploymentContext deploymentContext) throws LoaderException {
Map<String, PropertyValue<?>> propertyValues = componentDefinition.getPropertyValues();
for (PropertyValue propValue : propertyValues.values()) {
String source = propValue.getSource();
String file = propValue.getFile();
if (source != null) {
try {
// $<name>/...
int index = source.indexOf('/');
if (index == -1) {
// Tolerating $prop
source = source + "/";
index = source.length() - 1;
}
if (source.charAt(0) == '$') {
String name = source.substring(1, index);
Property<?> compositeProp = parent.getProperties().get(name);
if (compositeProp == null) {
InvalidValueException ex =
new InvalidValueException(
"The 'source' cannot be resolved to a composite property");
ex.addContextName(source);
throw ex;
}
boolean prependValue = false;
DocumentBuilder builder = DocumentBuilderFactory.newInstance().newDocumentBuilder();
Document compositePropDefValues = builder.newDocument();
Node element = null;
for (int count = 0 ; count < compositeProp.getDefaultValues().size() ; ++count) {
element = compositeProp.getDefaultValues().get(count);
prependValue = element.getNodeName().equals("value");
element = compositePropDefValues.adoptNode(element);
compositePropDefValues.appendChild(element);
}
// Adding /value because the document root is "value"
String path = source.substring(index);
String xpath = null;
Property<?> componentProperty = (Property<?>)
componentDefinition.getImplementation().getComponentType().getProperties().get(propValue.getName());
if (prependValue) {
if ("/".equals(path)) {
// trailing / is not legal for xpath
xpath = "/value";
} else {
xpath = "/value" + path;
}
} else {
xpath = path;
}
// FIXME: How to deal with namespaces?
Document node = evaluate(null, compositePropDefValues, xpath);
//Document node = evaluate(null, compositeProp.getDefaultValues().get(0).getOwnerDocument(), xpath);
if (node != null) {
List<Document> values = new ArrayList<Document>();
values.add(node);
propValue.setValue(values);
}
} else {
InvalidValueException ex =
new InvalidValueException("The 'source' has an invalid value");
ex.addContextName(source);
throw ex;
}
} catch (Exception e) {
throw new LoaderException(e);
}
} else if (file != null) {
Property<?> prop =
(Property<?>)componentDefinition.getImplementation().getComponentType().getProperties()
.get(propValue.getName());
Document document = loadFromFile(propValue.getFile(), deploymentContext);
List<Element> values = new ArrayList<Element>();
if (prop.isMany()) {
//extract the property value elements from the loaded document
Element element = document.getDocumentElement();
Node childNode = null;
for (int count = 0 ; count < element.getChildNodes().getLength() ; ++count) {
if (element.getChildNodes().item(count).getNodeType() == Document.ELEMENT_NODE) {
values.add((Element)element.getChildNodes().item(count));
}
}
propValue.setValue(values);
propValue.setValueFactory(new SimpleMultivaluedPropertyObjectFactory(prop, propValue.getValue()));
} else {
values.add(document.getDocumentElement());
propValue.setValue(values);
propValue.setValueFactory(new SimplePropertyObjectFactory(prop, (Element)propValue.getValue().get(0)));
}
}
}
}
private static class DOMNamespeceContext implements NamespaceContext {
private Node node;
/**
* @param node
*/
public DOMNamespeceContext(Node node) {
super();
this.node = node;
}
public String getNamespaceURI(String prefix) {
//return "http://foo";
return node.lookupNamespaceURI(prefix);
}
public String getPrefix(String namespaceURI) {
//return "foo";
return node.lookupPrefix(namespaceURI);
}
public Iterator getPrefixes(String namespaceURI) {
return null;
}
}
}
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