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/*******************************************************************************
* Copyright (c) 2007, 2008 IBM Corporation 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
*
* Contributors:
* IBM Corporation - initial API and implementation
*******************************************************************************/
package org.eclipse.equinox.internal.p2.update;
import java.io.*;
import java.util.StringTokenizer;
import javax.xml.parsers.*;
import org.eclipse.equinox.p2.core.ProvisionException;
import org.w3c.dom.*;
import org.xml.sax.SAXException;
/**
* Parser for platform.xml files.
*
* @since 1.0
*/
public class ConfigurationParser implements ConfigurationConstants {
/*
* Parse the given file handle which points to a platform.xml file and a configuration object.
* Returns null if the file doesn't exist.
*/
public static Configuration parse(File file) throws ProvisionException {
return new ConfigurationParser().internalParse(file);
}
/*
* Create a feature object based on the given DOM node.
* Return the new feature.
*/
private Feature createFeature(Node node, Site site) {
Feature result = new Feature(site);
String id = getAttribute(node, ATTRIBUTE_ID);
if (id != null)
result.setId(id);
String url = getAttribute(node, ATTRIBUTE_URL);
if (url != null)
result.setUrl(url);
String version = getAttribute(node, ATTRIBUTE_VERSION);
if (version != null)
result.setVersion(version);
return result;
}
/*
* Create the features from the given DOM node.
*/
private void createFeatures(Node node, Site site) {
NodeList children = node.getChildNodes();
int size = children.getLength();
for (int i = 0; i < size; i++) {
Node child = children.item(i);
if (child.getNodeType() != Node.ELEMENT_NODE)
continue;
if (!ELEMENT_FEATURE.equalsIgnoreCase(child.getNodeName()))
continue;
Feature feature = createFeature(child, site);
if (feature != null)
site.addFeature(feature);
}
}
/*
* Create a site based on the given DOM node.
*/
private Site createSite(Node node) {
Site result = new Site();
String policy = getAttribute(node, ATTRIBUTE_POLICY);
if (policy != null)
result.setPolicy(policy);
String enabled = getAttribute(node, ATTRIBUTE_ENABLED);
if (enabled != null)
result.setEnabled(Boolean.valueOf(enabled).booleanValue());
String updateable = getAttribute(node, ATTRIBUTE_UPDATEABLE);
if (updateable != null)
result.setUpdateable(Boolean.valueOf(updateable).booleanValue());
String url = getAttribute(node, ATTRIBUTE_URL);
if (url != null)
result.setUrl(url);
String linkFile = getAttribute(node, ATTRIBUTE_LINKFILE);
if (linkFile != null)
result.setLinkFile(linkFile);
String list = getAttribute(node, ATTRIBUTE_LIST);
if (list != null)
for (StringTokenizer tokenizer = new StringTokenizer(list, ","); tokenizer.hasMoreTokens();) //$NON-NLS-1$
result.addPlugin(tokenizer.nextToken());
createFeatures(node, result);
return result;
}
/*
* Return the attribute with the given name, or null if it does
* not exist.
*/
private String getAttribute(Node node, String name) {
NamedNodeMap attributes = node.getAttributes();
Node temp = attributes.getNamedItem(name);
return temp == null ? null : temp.getNodeValue();
}
/*
* Load the given file into a DOM document.
*/
private Document load(InputStream input) throws ParserConfigurationException, IOException, SAXException {
// load the feature xml
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
DocumentBuilder builder = factory.newDocumentBuilder();
input = new BufferedInputStream(input);
try {
return builder.parse(input);
} finally {
if (input != null)
try {
input.close();
} catch (IOException e) {
// ignore
}
}
}
/*
* Parse the given file handle which points to a platform.xml file and a configuration object.
* Returns null if the file doesn't exist.
*/
private Configuration internalParse(File file) throws ProvisionException {
if (!file.exists())
return null;
try {
InputStream input = new BufferedInputStream(new FileInputStream(file));
Document document = load(input);
return process(document);
} catch (IOException e) {
throw new ProvisionException("An error occurred reading the platform configuration file: " + file, e);
} catch (ParserConfigurationException e) {
throw new ProvisionException("An error occurred reading the platform configuration", e);
} catch (SAXException e) {
throw new ProvisionException("An error occurred reading the platform configuration", e);
}
}
/*
* Process the given DOM document and create the appropriate
* site objects.
*/
private Configuration process(Document document) {
Node node = getConfigElement(document);
if (node == null)
return null;
Configuration configuration = createConfiguration(node);
NodeList children = node.getChildNodes();
int size = children.getLength();
for (int i = 0; i < size; i++) {
Node child = children.item(i);
if (child.getNodeType() != Node.ELEMENT_NODE)
continue;
if (!ELEMENT_SITE.equalsIgnoreCase(child.getNodeName()))
continue;
Site site = createSite(child);
if (site != null)
configuration.add(site);
}
return configuration;
}
private Configuration createConfiguration(Node node) {
Configuration result = new Configuration();
String value = getAttribute(node, ATTRIBUTE_DATE);
if (value != null)
result.setDate(value);
value = getAttribute(node, ATTRIBUTE_TRANSIENT);
if (value != null)
result.setTransient(Boolean.valueOf(value).booleanValue());
value = getAttribute(node, ATTRIBUTE_SHARED_UR);
if (value != null)
result.setSharedUR(value);
value = getAttribute(node, ATTRIBUTE_VERSION);
if (value != null)
result.setVersion(value);
return result;
}
private Node getConfigElement(Document doc) {
NodeList children = doc.getChildNodes();
int size = children.getLength();
for (int i = 0; i < size; i++) {
Node child = children.item(i);
if (child.getNodeType() != Node.ELEMENT_NODE)
continue;
if (ELEMENT_CONFIG.equalsIgnoreCase(child.getNodeName()))
return child;
}
return null;
}
}
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