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/*
* Copyright (c) 2016 Cisco Systems, Inc. and others. All rights reserved.
*
* This program and the accompanying materials are made available under the
* terms of the Eclipse Public License v1.0 which accompanies this distribution,
* and is available at http://www.eclipse.org/legal/epl-v10.html
*/
package org.opendaylight.netconf.sal.streams.listeners;
import java.io.ByteArrayOutputStream;
import java.io.IOException;
import java.nio.charset.StandardCharsets;
import java.time.Instant;
import java.time.OffsetDateTime;
import java.time.ZoneId;
import java.time.format.DateTimeFormatter;
import javax.xml.stream.XMLOutputFactory;
import javax.xml.stream.XMLStreamException;
import javax.xml.stream.XMLStreamWriter;
import javax.xml.transform.OutputKeys;
import javax.xml.transform.Transformer;
import javax.xml.transform.TransformerException;
import javax.xml.transform.TransformerFactory;
import javax.xml.transform.dom.DOMResult;
import javax.xml.transform.dom.DOMSource;
import javax.xml.transform.stream.StreamResult;
import org.opendaylight.yangtools.util.xml.UntrustedXML;
import org.opendaylight.yangtools.yang.data.api.schema.NormalizedNode;
import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.data.api.schema.stream.NormalizedNodeWriter;
import org.opendaylight.yangtools.yang.data.codec.xml.XMLStreamNormalizedNodeStreamWriter;
import org.opendaylight.yangtools.yang.model.util.SchemaInferenceStack.Inference;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
import org.w3c.dom.Document;
import org.w3c.dom.Element;
/**
* Abstract class for processing and preparing data.
*
*/
abstract class AbstractNotificationsData {
private static final Logger LOG = LoggerFactory.getLogger(AbstractNotificationsData.class);
private static final TransformerFactory TF = TransformerFactory.newInstance();
private static final XMLOutputFactory OF = XMLOutputFactory.newFactory();
/**
* Formats data specified by RFC3339.
*
* @param now time stamp
* @return Data specified by RFC3339.
*/
protected static String toRFC3339(final Instant now) {
return DateTimeFormatter.ISO_OFFSET_DATE_TIME.format(OffsetDateTime.ofInstant(now, ZoneId.systemDefault()));
}
/**
* Creates {@link Document} document.
*
* @return {@link Document} document.
*/
protected static Document createDocument() {
return UntrustedXML.newDocumentBuilder().newDocument();
}
/**
* Write normalized node to {@link DOMResult}.
*
* @param normalized
* data
* @param inference
* SchemaInferenceStack state for the data
* @return {@link DOMResult}
*/
protected DOMResult writeNormalizedNode(final NormalizedNode normalized, final Inference inference)
throws IOException, XMLStreamException {
final Document doc = UntrustedXML.newDocumentBuilder().newDocument();
final DOMResult result = new DOMResult(doc);
NormalizedNodeWriter normalizedNodeWriter = null;
NormalizedNodeStreamWriter normalizedNodeStreamWriter = null;
XMLStreamWriter writer = null;
try {
writer = OF.createXMLStreamWriter(result);
normalizedNodeStreamWriter = XMLStreamNormalizedNodeStreamWriter.create(writer, inference);
normalizedNodeWriter = NormalizedNodeWriter.forStreamWriter(normalizedNodeStreamWriter);
normalizedNodeWriter.write(normalized);
normalizedNodeWriter.flush();
} finally {
if (normalizedNodeWriter != null) {
normalizedNodeWriter.close();
}
if (normalizedNodeStreamWriter != null) {
normalizedNodeStreamWriter.close();
}
if (writer != null) {
writer.close();
}
}
return result;
}
/**
* Generating base element of every notification.
*
* @param doc
* base {@link Document}
* @return element of {@link Document}
*/
protected Element basePartDoc(final Document doc) {
final Element notificationElement =
doc.createElementNS("urn:ietf:params:xml:ns:netconf:notification:1.0", "notification");
doc.appendChild(notificationElement);
final Element eventTimeElement = doc.createElement("eventTime");
eventTimeElement.setTextContent(toRFC3339(Instant.now()));
notificationElement.appendChild(eventTimeElement);
return notificationElement;
}
/**
* Generating of {@link Document} transforming to string.
*
* @param doc
* {@link Document} with data
* @return - string from {@link Document}
*/
protected String transformDoc(final Document doc) {
final ByteArrayOutputStream out = new ByteArrayOutputStream();
try {
final Transformer transformer = TF.newTransformer();
transformer.setOutputProperty(OutputKeys.OMIT_XML_DECLARATION, "no");
transformer.setOutputProperty(OutputKeys.METHOD, "xml");
transformer.setOutputProperty(OutputKeys.INDENT, "yes");
transformer.setOutputProperty(OutputKeys.ENCODING, "UTF-8");
transformer.setOutputProperty("{http://xml.apache.org/xslt}indent-amount", "4");
transformer.transform(new DOMSource(doc), new StreamResult(out));
} catch (final TransformerException e) {
// FIXME: this should raise an exception
final String msg = "Error during transformation of Document into String";
LOG.error(msg, e);
return msg;
}
return new String(out.toByteArray(), StandardCharsets.UTF_8);
}
}
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