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Diffstat (limited to '')
-rw-r--r-- | sandbox/event/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/PropertyConfigurationUtil.java | 213 |
1 files changed, 213 insertions, 0 deletions
diff --git a/sandbox/event/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/PropertyConfigurationUtil.java b/sandbox/event/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/PropertyConfigurationUtil.java new file mode 100644 index 0000000000..0105d4af50 --- /dev/null +++ b/sandbox/event/modules/assembly/src/main/java/org/apache/tuscany/sca/assembly/builder/impl/PropertyConfigurationUtil.java @@ -0,0 +1,213 @@ +/* + * 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(); + } + + } + +} |