org.apache.webbeans.xml.DefaultBeanArchiveService Maven / Gradle / Ivy
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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.webbeans.xml;
import javax.xml.parsers.DocumentBuilder;
import javax.xml.parsers.DocumentBuilderFactory;
import java.io.IOException;
import java.io.InputStream;
import java.io.PushbackInputStream;
import java.net.URL;
import java.util.ArrayList;
import java.util.HashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;
import java.util.logging.Level;
import java.util.logging.Logger;
import org.apache.webbeans.config.OWBLogConst;
import org.apache.webbeans.exception.WebBeansConfigurationException;
import org.apache.webbeans.exception.WebBeansDeploymentException;
import org.apache.webbeans.exception.WebBeansException;
import org.apache.webbeans.logger.WebBeansLoggerFacade;
import org.apache.webbeans.spi.BeanArchiveService;
import org.apache.webbeans.util.UrlSet;
import org.apache.webbeans.util.WebBeansConstants;
import org.w3c.dom.Element;
import org.w3c.dom.Node;
import org.w3c.dom.NodeList;
/**
* Please note that this implementation is not thread safe.
*/
public class DefaultBeanArchiveService implements BeanArchiveService
{
private static final String WEB_INF_CLASSES = "WEB-INF/classes/";
private static final String WEB_INF_CLASSES_MAVEN = "target/classes/";
private static final String META_INF_BEANS_XML = "/META-INF/beans.xml";
private static final Logger logger = WebBeansLoggerFacade.getLogger(BeanArchiveService.class);
/**
* Contains a map from the URL externalForm to the stored BeanArchiveInformation
*/
private Map beanArchiveInformations = new HashMap();
private UrlSet registeredBeanArchives = new UrlSet();
@Override
public BeanArchiveInformation getBeanArchiveInformation(URL beanArchiveUrl)
{
String beanArchiveLocation = beanArchiveUrl.toExternalForm();
BeanArchiveInformation bdaInfo = beanArchiveInformations.get(beanArchiveLocation);
if (bdaInfo == null && !beanArchiveLocation.contains(".xml"))
{
// probably the beanArchiveUrl is a JAR classpath and not a beans.xml itself
// in this case we need to look whether we have a corresponding beans.xml already scanned
String strippedBeanArchiveUrl = stripProtocol(beanArchiveLocation);
strippedBeanArchiveUrl = stripTrailingSlash(strippedBeanArchiveUrl);
for (Map.Entry entry : beanArchiveInformations.entrySet())
{
// we have to 'normalise' both values and remove the beans.xml string to be compareable
String entryUrl = stripProtocol(entry.getKey());
if (entryUrl.length() > META_INF_BEANS_XML.length() &&
entryUrl.substring(entryUrl.length() - META_INF_BEANS_XML.length()).equalsIgnoreCase(META_INF_BEANS_XML))
{
entryUrl = entryUrl.substring(0, entryUrl.length() - META_INF_BEANS_XML.length());
entryUrl = stripTrailingSlash(entryUrl);
}
if (entryUrl.equals(strippedBeanArchiveUrl))
{
bdaInfo = entry.getValue();
break;
}
}
}
if (bdaInfo == null
&& (beanArchiveLocation.contains(WEB_INF_CLASSES) || beanArchiveLocation.contains(WEB_INF_CLASSES_MAVEN)))
{
// this is a very special case for beans.xml in a WAR file
// in this case we need to merge the 2 BDAs from WEB-INF/classes/META-INF/beans.xml and WEB-INF/beans.xml
// this requires the WEB-INF/beans.xml being parsed first (which is usually the case)
// first we read the BeanArchiveInformation from the WEB-INF/classes directory.
bdaInfo = readBeansXml(beanArchiveUrl, beanArchiveLocation);
// next we merge in the BDAInfo from WEB-INF/beans.xml
bdaInfo = mergeWithWebInfBeansXml(bdaInfo);
beanArchiveInformations.put(beanArchiveLocation, bdaInfo);
registeredBeanArchives.add(beanArchiveUrl);
}
if (bdaInfo == null)
{
// if we still did not find anything, then this is a 'new' bean archive
bdaInfo = readBeansXml(beanArchiveUrl, beanArchiveLocation);
beanArchiveInformations.put(beanArchiveLocation, bdaInfo);
registeredBeanArchives.add(beanArchiveUrl);
}
return bdaInfo;
}
/**
* Merge the BDA info from webInfClasses with the one from WEB-INF/beans.xml
*/
private BeanArchiveInformation mergeWithWebInfBeansXml(BeanArchiveInformation bdaWebClasses)
{
BeanArchiveInformation bdaWebInf = null;
for (Map.Entry entry : beanArchiveInformations.entrySet())
{
if (entry.getKey().endsWith("WEB-INF/beans.xml"))
{
bdaWebInf = entry.getValue();
break;
}
}
if (bdaWebInf == null)
{
// no merge needed
return bdaWebClasses;
}
// means we need to merge them
DefaultBeanArchiveInformation mergedBdaInfo = new DefaultBeanArchiveInformation(bdaWebClasses.getBdaUrl());
mergedBdaInfo.setBeanDiscoveryMode(BeanDiscoveryMode.max(bdaWebClasses.getBeanDiscoveryMode(), bdaWebInf.getBeanDiscoveryMode()));
mergedBdaInfo.setVersion(bdaWebClasses.getVersion() != null ? bdaWebClasses.getVersion() : bdaWebInf.getVersion());
mergedBdaInfo.setExcludedClasses(mergeLists(bdaWebClasses.getExcludedClasses(), bdaWebInf.getExcludedClasses()));
mergedBdaInfo.setExcludedPackages(mergeLists(bdaWebClasses.getExcludedPackages(), bdaWebInf.getExcludedPackages()));
mergedBdaInfo.setInterceptors(mergeLists(bdaWebClasses.getInterceptors(), bdaWebInf.getInterceptors()));
mergedBdaInfo.setDecorators(mergeLists(bdaWebClasses.getDecorators(), bdaWebInf.getDecorators()));
mergedBdaInfo.getAlternativeClasses().addAll(mergeLists(bdaWebClasses.getAlternativeClasses(), bdaWebInf.getAlternativeClasses()));
mergedBdaInfo.getAlternativeStereotypes().addAll(mergeLists(bdaWebClasses.getAlternativeStereotypes(), bdaWebInf.getAlternativeStereotypes()));
// we do NOT merge the allowProxying as they just stack up anyway
return mergedBdaInfo;
}
private List mergeLists(List list1, List list2)
{
if (list1 == null || list1.isEmpty())
{
return list2;
}
if (list2 == null)
{
return null;
}
List mergedList = new ArrayList(list1);
for (String val : list2)
{
if (!mergedList.contains(val))
{
mergedList.add(val);
}
}
return mergedList;
}
@Override
public Set getRegisteredBeanArchives()
{
return registeredBeanArchives;
}
/**
* This method exists for extensibility reasons.
*/
protected DefaultBeanArchiveInformation createBeanArchiveInformation(String bdaUrl)
{
return new DefaultBeanArchiveInformation(bdaUrl);
}
private BeanArchiveInformation readBeansXml(URL beansXmlUrl, String beansXmlLocation)
{
if (beansXmlUrl == null)
{
throw new WebBeansConfigurationException("beans.xml URL must be given!");
}
if (!beansXmlLocation.endsWith(".xml"))
{
// handle jars without beans.xml file
DefaultBeanArchiveInformation bdaInfo = createBeanArchiveInformation(beansXmlLocation);
bdaInfo.setBeanDiscoveryMode(BeanDiscoveryMode.ANNOTATED);
return bdaInfo;
}
InputStream xmlStream = null;
try
{
xmlStream = beansXmlUrl.openStream();
return readBeansXml(xmlStream, beansXmlUrl.toExternalForm());
}
catch (Exception e)
{
throw new WebBeansDeploymentException("Error while parsing the beans.xml file " + beansXmlLocation, e);
}
finally
{
try
{
if (xmlStream != null)
{
xmlStream.close();
}
}
catch (IOException ioe)
{
throw new WebBeansDeploymentException("Error while closing the input stream!", ioe);
}
}
}
/**
* Get rid of any protocol header from the url externalForm
* @param urlPath
*/
protected String stripProtocol(String urlPath)
{
int pos = urlPath.lastIndexOf(":/");
if (pos > 0)
{
return urlPath.substring(pos+1);
}
return urlPath;
}
private String stripTrailingSlash(String urlPath)
{
while (urlPath.endsWith("/") || urlPath.endsWith("!") || urlPath.endsWith("\\"))
{
urlPath = urlPath.substring(0, urlPath.length() - 1);
}
return urlPath;
}
/**
* Read the information from the given beans.xml and fill it into a
* BeanArchiveInformation instance.
*/
protected BeanArchiveInformation readBeansXml(InputStream xmlStreamIn, String beansXmlLocation) throws IOException
{
DefaultBeanArchiveInformation bdaInfo = createBeanArchiveInformation(beansXmlLocation);
if (xmlStreamIn != null)
{
PushbackInputStream xmlStream = new PushbackInputStream(xmlStreamIn);
// try to read from the stream
int firstVal = xmlStream.read();
if (firstVal < 0)
{
// this means the stream is empty
bdaInfo.setBeanDiscoveryMode(BeanDiscoveryMode.ALL);
}
else
{
// put the first byte back on the stream so we can properly parse the XML.
xmlStream.unread(firstVal);
//Get root element of the XML document
Element webBeansRoot = getBeansRootElement(xmlStream);
if (webBeansRoot == null)
{
bdaInfo.setBeanDiscoveryMode(BeanDiscoveryMode.ALL);
}
else
{
if (!"beans".equalsIgnoreCase(webBeansRoot.getLocalName()))
{
throw new WebBeansConfigurationException("beans.xml must have a root element, but has: " + webBeansRoot.getLocalName() +
" in " + beansXmlLocation);
}
bdaInfo.setVersion(getTrimmedAttribute(webBeansRoot, "version"));
String beanDiscoveryMode = getTrimmedAttribute(webBeansRoot, "bean-discovery-mode");
bdaInfo.setBeanDiscoveryMode(beanDiscoveryMode != null ? BeanDiscoveryMode.valueOf(beanDiscoveryMode.toUpperCase()) : null);
readBeanChildren(bdaInfo, webBeansRoot, beansXmlLocation);
}
if (bdaInfo.getVersion() != null && !"1.0".equals(bdaInfo.getVersion()) && bdaInfo.getBeanDiscoveryMode() == null)
{
throw new WebBeansConfigurationException("beans.xml with version 1.1 and higher must declare a bean-discovery-mode! url=" + beansXmlLocation);
}
if (bdaInfo.getBeanDiscoveryMode() == null)
{
// an empty beans.xml file lead to backward compat mode with CDI-1.1.
bdaInfo.setBeanDiscoveryMode(BeanDiscoveryMode.ALL);
}
}
}
if (bdaInfo.getBeanDiscoveryMode() == null)
{
// no beans.xml file at all will lead to 'implicit bean archive' behaviour.
bdaInfo.setBeanDiscoveryMode(BeanDiscoveryMode.ANNOTATED);
}
return bdaInfo;
}
private void readBeanChildren(DefaultBeanArchiveInformation bdaInfo, Element webBeansRoot, String beansXmlLocation)
{
ElementIterator elit = new ElementIterator(webBeansRoot);
while (elit.hasNext())
{
Element child = elit.next();
if (WebBeansConstants.WEB_BEANS_XML_DECORATORS_ELEMENT.equalsIgnoreCase(child.getLocalName()))
{
fillDecorators(bdaInfo, child);
}
else if (WebBeansConstants.WEB_BEANS_XML_INTERCEPTORS_ELEMENT.equalsIgnoreCase(child.getLocalName()))
{
fillInterceptors(bdaInfo, child);
}
else if (WebBeansConstants.WEB_BEANS_XML_ALTERNATIVES_ELEMENT.equalsIgnoreCase(child.getLocalName()))
{
fillAlternatives(bdaInfo, child);
}
else if (WebBeansConstants.WEB_BEANS_XML_SCAN_ELEMENT.equalsIgnoreCase(child.getLocalName()))
{
fillExcludes(bdaInfo, child);
}
else if (WebBeansConstants.WEB_BEANS_XML_ALLOW_PROXYING_ELEMENT.equalsIgnoreCase(child.getLocalName()))
{
fillAllowProxying(bdaInfo, child);
}
else if (WebBeansConstants.WEB_BEANS_XML_SCOPED_BEANS_ONLY_ELEMENT.equalsIgnoreCase(child.getLocalName()))
{
logger.log(Level.FINE, "trimmed bean archive detected: " + beansXmlLocation);
bdaInfo.setBeanDiscoveryMode(BeanDiscoveryMode.TRIM);
}
}
}
private void fillDecorators(DefaultBeanArchiveInformation bdaInfo, Element decoratorsElement)
{
ElementIterator elit = new ElementIterator(decoratorsElement);
while (elit.hasNext())
{
Element child = elit.next();
if (WebBeansConstants.WEB_BEANS_XML_CLASS.equalsIgnoreCase(child.getLocalName()))
{
String clazz = child.getTextContent().trim();
if (clazz.isEmpty())
{
throw new WebBeansConfigurationException("decorators element must not be empty!");
}
bdaInfo.getDecorators().add(clazz);
}
}
}
private void fillInterceptors(DefaultBeanArchiveInformation bdaInfo, Element interceptorsElement)
{
ElementIterator elit = new ElementIterator(interceptorsElement);
while (elit.hasNext())
{
Element child = elit.next();
if (WebBeansConstants.WEB_BEANS_XML_CLASS.equalsIgnoreCase(child.getLocalName()))
{
String clazz = child.getTextContent().trim();
if (clazz.isEmpty())
{
throw new WebBeansConfigurationException("interceptors element must not be empty!");
}
bdaInfo.getInterceptors().add(clazz);
}
}
}
private void fillAlternatives(DefaultBeanArchiveInformation bdaInfo, Element alternativesElement)
{
ElementIterator elit = new ElementIterator(alternativesElement);
while (elit.hasNext())
{
Element child = elit.next();
if (WebBeansConstants.WEB_BEANS_XML_CLASS.equalsIgnoreCase(child.getLocalName()))
{
String clazz = child.getTextContent().trim();
if (clazz.isEmpty())
{
throw new WebBeansConfigurationException("alternatives element must not be empty!");
}
bdaInfo.getAlternativeClasses().add(clazz);
}
if (WebBeansConstants.WEB_BEANS_XML_STEREOTYPE.equalsIgnoreCase(child.getLocalName()))
{
String stereotype = child.getTextContent().trim();
if (stereotype.isEmpty())
{
throw new WebBeansConfigurationException("alternatives element must not be empty!");
}
bdaInfo.getAlternativeStereotypes().add(stereotype);
}
}
}
private void fillExcludes(DefaultBeanArchiveInformation bdaInfo, Element scanElement)
{
final ClassLoader loader = Thread.currentThread().getContextClassLoader();
final NodeList childNodes = scanElement.getChildNodes();
for (int i = 0; i < childNodes.getLength(); i++)
{
final Node nd = childNodes.item(i);
if (!Element.class.isInstance(nd))
{
continue;
}
final Element child = Element.class.cast(nd);
if (WebBeansConstants.WEB_BEANS_XML_EXCLUDE.equalsIgnoreCase(child.getLocalName()))
{
final String name = getTrimmedAttribute(child, "name");
final NodeList children = child.getChildNodes();
boolean skip = false;
for (int j = 0; j < children.getLength(); j++)
{
final Node ndChild = children.item(j);
if (!Element.class.isInstance(ndChild))
{
continue;
}
final Element condition = Element.class.cast(ndChild);
final String localName = condition.getLocalName();
if (WebBeansConstants.WEB_BEANS_XML_IF_CLASS_AVAILABLE.equalsIgnoreCase(localName))
{
if (!isClassAvailable(loader, getTrimmedAttribute(condition, "name")))
{
skip = true;
break;
}
}
else if (WebBeansConstants.WEB_BEANS_XML_IF_CLASS_NOT_AVAILABLE.equalsIgnoreCase(localName))
{
if (isClassAvailable(loader, getTrimmedAttribute(condition, "name")))
{
skip = true;
break;
}
}
else if (WebBeansConstants.WEB_BEANS_XML_IF_SYSTEM_PROPERTY.equalsIgnoreCase(localName))
{
final String value = getTrimmedAttribute(condition, "value");
final String systProp = System.getProperty(getTrimmedAttribute(condition, "name"));
if ((value == null && systProp == null) || !(value != null && value.equals(systProp)))
{
skip = true;
break;
}
}
}
if (skip)
{
continue;
}
if (name.endsWith(".*"))
{
// package exclude without sub-packages
bdaInfo.addClassExclude(name.substring(0, name.length() - 2));
}
else if (name.endsWith(".**"))
{
// package exclude WITH sub-packages
bdaInfo.addPackageExclude(name.substring(0, name.length() - 3));
}
else
{
// a simple Class
bdaInfo.addClassExclude(name);
}
}
}
}
private void fillAllowProxying(DefaultBeanArchiveInformation bdaInfo, Element allowProxyingElement)
{
ElementIterator elit = new ElementIterator(allowProxyingElement);
while (elit.hasNext())
{
Element child = elit.next();
if (WebBeansConstants.WEB_BEANS_XML_CLASS.equalsIgnoreCase(child.getLocalName()))
{
String clazz = child.getTextContent().trim();
if (clazz.isEmpty())
{
throw new WebBeansConfigurationException("allowProxying element must not be empty!");
}
bdaInfo.getAllowProxyingClasses().add(clazz);
}
}
}
private static boolean isClassAvailable(final ClassLoader loader, final String name)
{
try
{
// no Class.forName(name) since it doesn't attach the classloader loader to the class in some cases
loader.loadClass(name);
return true;
}
catch (final Throwable e) // NoClassDefFoundError or ClassNotFoundException
{
return false;
}
}
@Override
public void release()
{
beanArchiveInformations.clear();
}
/**
* Gets the root element of the parsed document.
*
* @param xmlStream parsed document
* @return root element of the document
* @throws org.apache.webbeans.exception.WebBeansException if any runtime exception occurs
*/
protected Element getBeansRootElement(InputStream xmlStream) throws WebBeansException
{
try
{
DocumentBuilderFactory factory = DocumentBuilderFactory.newInstance();
factory.setCoalescing(false);
factory.setExpandEntityReferences(true);
factory.setIgnoringComments(true);
factory.setIgnoringElementContentWhitespace(true);
factory.setNamespaceAware(true);
factory.setValidating(false);
DocumentBuilder documentBuilder = factory.newDocumentBuilder();
documentBuilder.setErrorHandler(new WebBeansErrorHandler());
Element root = documentBuilder.parse(xmlStream).getDocumentElement();
return root;
}
catch (Exception e)
{
logger.log(Level.SEVERE, OWBLogConst.FATAL_0002, e);
throw new WebBeansException(WebBeansLoggerFacade.getTokenString(OWBLogConst.EXCEPT_0013), e);
}
}
/**
* @return the trimmed attribute value, or null if the attribute does not exist or the attribute is empty
*/
protected String getTrimmedAttribute(Element element, String attributeName)
{
String val = element.getAttribute(attributeName);
if (val != null)
{
val = val.trim();
if (!val.isEmpty())
{
return val;
}
}
return null;
}
}
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