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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.sca.assembly.builder.impl;
import java.io.IOException;
import java.io.InputStream;
import java.net.MalformedURLException;
import java.net.URI;
import java.net.URL;
import java.net.URLConnection;
import java.util.Arrays;
import java.util.Collections;
import java.util.Iterator;
import java.util.List;
import java.util.Map;
import javax.xml.XMLConstants;
import javax.xml.namespace.NamespaceContext;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.transform.Source;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.sax.SAXSource;
import javax.xml.xpath.XPathConstants;
import javax.xml.xpath.XPathExpression;
import javax.xml.xpath.XPathExpressionException;
import org.apache.tuscany.sca.assembly.Component;
import org.apache.tuscany.sca.assembly.ComponentProperty;
import org.apache.tuscany.sca.assembly.Property;
import org.apache.tuscany.sca.assembly.builder.CompositeBuilderException;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.xml.sax.InputSource;
/**
* Utility class to deal with processing of component properties that are taking values from the parent
* composite's properties or an external file.
*
* @version $Rev$ $Date$
*/
abstract class PropertyConfigurationUtil {
private static Document evaluate(Document node, XPathExpression expression, DocumentBuilderFactory documentBuilderFactory)
throws XPathExpressionException, ParserConfigurationException {
Node value = node.getDocumentElement();
Node result = (Node)expression.evaluate(value, XPathConstants.NODE);
if (result == null) {
return null;
}
// TODO: How to wrap the result into a Document?
Document document = documentBuilderFactory.newDocumentBuilder().newDocument();
if (result instanceof Document) {
return (Document)result;
} else {
//Element root = document.createElementNS(null, "value");
//document.appendChild(root);
document.appendChild(document.importNode(result, true));
return document;
}
}
private static Document loadFromFile(String file, TransformerFactory transformerFactory) throws MalformedURLException, IOException,
TransformerException, ParserConfigurationException {
URI uri = URI.create(file);
// URI resolution for relative URIs is done when the composite is resolved.
URL url = uri.toURL();
URLConnection connection = url.openConnection();
connection.setUseCaches(false);
InputStream is = null;
try {
is = connection.getInputStream();
Source streamSource = new SAXSource(new InputSource(is));
DOMResult result = new DOMResult();
javax.xml.transform.Transformer transformer = transformerFactory.newTransformer();
transformer.transform(streamSource, result);
Document document = (Document)result.getNode();
// TUSCANY-2377, Add a fake value element so it's consistent with
// the DOM tree loaded from inside SCDL
Element root = document.createElementNS(null, "value");
root.appendChild(document.getDocumentElement());
document.appendChild(root);
return document;
} finally {
if (is != null) {
is.close();
}
}
}
static void sourceComponentProperties(Map<String, Property> compositeProperties,
Component componentDefinition,
DocumentBuilderFactory documentBuilderFactory,
TransformerFactory transformerFactory) throws CompositeBuilderException,
ParserConfigurationException,
XPathExpressionException,
TransformerException,
IOException {
List<ComponentProperty> componentProperties = componentDefinition.getProperties();
for (ComponentProperty aProperty : componentProperties) {
String source = aProperty.getSource();
String file = aProperty.getFile();
if (source != null) {
// $<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 = compositeProperties.get(name);
if (compositeProp == null) {
throw new CompositeBuilderException("The 'source' cannot be resolved to a composite property: " + source);
}
Document compositePropDefValues = (Document)compositeProp.getValue();
// FIXME: How to deal with namespaces?
Document node = evaluate(compositePropDefValues, aProperty.getSourceXPathExpression(), documentBuilderFactory);
if (node != null) {
aProperty.setValue(node);
}
} else {
throw new CompositeBuilderException("The 'source' has an invalid value: " + source);
}
} else if (file != null) {
aProperty.setValue(loadFromFile(aProperty.getFile(), transformerFactory));
}
}
}
private static class DOMNamespaceContext implements NamespaceContext {
private Node node;
/**
* @param node
*/
public DOMNamespaceContext(Node node) {
super();
this.node = node;
}
public String getNamespaceURI(String prefix) {
if (prefix == null) {
throw new IllegalArgumentException("Prefix is null");
} else if (XMLConstants.XML_NS_PREFIX.equals(prefix)) {
return XMLConstants.XML_NS_URI;
} else if (XMLConstants.XMLNS_ATTRIBUTE.equals(prefix)) {
return XMLConstants.XMLNS_ATTRIBUTE_NS_URI;
}
String ns = node.lookupNamespaceURI(prefix);
return ns == null ? XMLConstants.NULL_NS_URI : ns;
}
public String getPrefix(String namespaceURI) {
if (namespaceURI == null) {
throw new IllegalArgumentException("Namespace URI is null");
} else if (XMLConstants.XML_NS_URI.equals(namespaceURI)) {
return XMLConstants.XML_NS_PREFIX;
} else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(namespaceURI)) {
return XMLConstants.XMLNS_ATTRIBUTE;
}
return node.lookupPrefix(namespaceURI);
}
public Iterator<?> getPrefixes(String namespaceURI) {
// Not implemented
if (namespaceURI == null) {
throw new IllegalArgumentException("Namespace URI is null");
} else if (XMLConstants.XML_NS_URI.equals(namespaceURI)) {
return Arrays.asList(XMLConstants.XML_NS_PREFIX).iterator();
} else if (XMLConstants.XMLNS_ATTRIBUTE_NS_URI.equals(namespaceURI)) {
return Arrays.asList(XMLConstants.XMLNS_ATTRIBUTE).iterator();
}
String prefix = getPrefix(namespaceURI);
if (prefix == null) {
return Collections.emptyList().iterator();
}
return Arrays.asList(prefix).iterator();
}
}
}
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