org.sca4j.loader.impl.DefaultLoaderHelper Maven / Gradle / Ivy
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package org.sca4j.loader.impl;
import java.net.URI;
import java.util.ArrayList;
import java.util.LinkedList;
import java.util.List;
import java.util.StringTokenizer;
import javax.xml.XMLConstants;
import javax.xml.namespace.QName;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import javax.xml.parsers.ParserConfigurationException;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamReader;
import org.sca4j.host.Namespaces;
import org.sca4j.introspection.IntrospectionContext;
import org.sca4j.introspection.xml.InvalidPrefixException;
import org.sca4j.introspection.xml.LoaderHelper;
import org.sca4j.scdl.PolicyAware;
import org.sca4j.transform.TransformationException;
import org.sca4j.transform.xml.Stream2Element2;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Default implementation of the loader helper.
*
* @version $Revision$ $Date$
*/
public class DefaultLoaderHelper implements LoaderHelper {
private final Stream2Element2 stream2Element;
private final DocumentBuilder builder;
public DefaultLoaderHelper() {
stream2Element = new Stream2Element2();
DocumentBuilderFactory documentBuilderFactory = DocumentBuilderFactory.newInstance();
documentBuilderFactory.setNamespaceAware(true);
try {
builder = documentBuilderFactory.newDocumentBuilder();
} catch (ParserConfigurationException e) {
throw new AssertionError(e);
}
}
/**
* Load the value of the attribute key from the current element.
*
* @param reader a stream containing a property value
* @return a standalone document containing the value
* @throws javax.xml.stream.XMLStreamException if there was a problem reading the stream
*/
public Document loadKey(XMLStreamReader reader) {
String key = reader.getAttributeValue(Namespaces.SCA4J_NS, "key");
if (key == null) {
return null;
}
// create a document with a root element to hold the key value
Document document = builder.newDocument();
Element element = document.createElement("key");
document.appendChild(element);
// TODO: we should copy all in-context namespaces to the declaration if we can find what they are
// in the mean time, see if the value looks like it might contain a prefix
int index = key.indexOf(':');
if (index != -1) {
String prefix = key.substring(0, index);
String uri = reader.getNamespaceURI(prefix);
if (uri != null) {
element.setAttributeNS(XMLConstants.XMLNS_ATTRIBUTE_NS_URI, "xmlns:" + prefix, uri);
}
}
// set the text value
element.appendChild(document.createTextNode(key));
return document;
}
public Document loadValue(XMLStreamReader reader) throws XMLStreamException {
Document value = builder.newDocument();
Element root = value.createElement("value");
value.appendChild(root);
try {
stream2Element.transform(reader, root, null);
} catch (TransformationException e) {
throw (XMLStreamException) e.getCause();
}
return value;
}
public void loadPolicySetsAndIntents(PolicyAware policyAware, XMLStreamReader reader, IntrospectionContext context) {
try {
policyAware.setIntents(parseListOfQNames(reader, "requires"));
policyAware.setPolicySets(parseListOfQNames(reader, "policySets"));
} catch (InvalidPrefixException e) {
context.addError(new InvalidQNamePrefix(e.getPrefix(), reader));
}
}
public List parseListOfQNames(XMLStreamReader reader, String attribute) throws InvalidPrefixException {
List qNames = new LinkedList();
String val = reader.getAttributeValue(null, attribute);
if (val != null) {
StringTokenizer tok = new StringTokenizer(val);
while (tok.hasMoreElements()) {
qNames.add(createQName(tok.nextToken(), reader));
}
}
return qNames;
}
public QName createQName(String name, XMLStreamReader reader) throws InvalidPrefixException {
QName qName;
int index = name.indexOf(':');
if (index != -1) {
String prefix = name.substring(0, index);
String localPart = name.substring(index + 1);
String ns = reader.getNamespaceContext().getNamespaceURI(prefix);
if (ns == null) {
throw new InvalidPrefixException("Invalid prefix: " + prefix, prefix, reader);
}
qName = new QName(ns, localPart, prefix);
} else {
String prefix = "";
String ns = reader.getNamespaceURI();
qName = new QName(ns, name, prefix);
}
return qName;
}
public URI getURI(String target) {
if (target == null) {
return null;
}
int index = target.lastIndexOf('/');
if (index == -1) {
return URI.create(target);
} else {
String uri = target.substring(0, index);
String fragment = target.substring(index + 1);
return URI.create(uri + '#' + fragment);
}
}
public List parseListOfUris(XMLStreamReader reader, String attribute) {
String value = reader.getAttributeValue(null, attribute);
if (value == null || value.length() == 0) {
return null;
} else {
StringTokenizer tok = new StringTokenizer(value);
List result = new ArrayList(tok.countTokens());
while (tok.hasMoreTokens()) {
result.add(getURI(tok.nextToken().trim()));
}
return result;
}
}
}
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