javax.xml.soap.FactoryFinder Maven / Gradle / Ivy
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package javax.xml.soap;
import java.io.*;
import java.nio.charset.StandardCharsets;
import java.nio.file.Files;
import java.nio.file.Path;
import java.nio.file.Paths;
import java.security.AccessController;
import java.security.PrivilegedAction;
import java.util.Properties;
import java.util.logging.Level;
import java.util.logging.Logger;
class FactoryFinder {
private static final Logger logger = Logger.getLogger("javax.xml.soap");
private static final ServiceLoaderUtil.ExceptionHandler EXCEPTION_HANDLER =
new ServiceLoaderUtil.ExceptionHandler() {
@Override
public SOAPException createException(Throwable throwable, String message) {
return new SOAPException(message, throwable);
}
};
/**
* Finds the implementation {@code Class} object for the given
* factory type. If it fails and {@code tryFallback} is {@code true}
* finds the {@code Class} object for the given default class name.
* The arguments supplied must be used in order
* Note the default class name may be needed even if fallback
* is not to be attempted in order to check if requested type is fallback.
*
* This method is package private so that this code can be shared.
*
* @return the {@code Class} object of the specified message factory;
* may not be {@code null}
*
* @param factoryClass factory abstract class or interface to be found
* @param deprecatedFactoryId deprecated name of a factory; it is used for types
* where class name is different from a name
* being searched (in previous spec).
* @param defaultClassName the implementation class name, which is
* to be used only if nothing else
* is found; {@code null} to indicate
* that there is no default class name
* @param tryFallback whether to try the default class as a
* fallback
* @exception SOAPException if there is a SOAP error
*/
@SuppressWarnings("unchecked")
static T find(Class factoryClass,
String defaultClassName,
boolean tryFallback, String deprecatedFactoryId) throws SOAPException {
ClassLoader tccl = ServiceLoaderUtil.contextClassLoader(EXCEPTION_HANDLER);
String factoryId = factoryClass.getName();
// Use the system property first
String className = fromSystemProperty(factoryId, deprecatedFactoryId);
if (className != null) {
Object result = newInstance(className, defaultClassName, tccl);
if (result != null) {
return (T) result;
}
}
// try to read from $java.home/lib/jaxm.properties
className = fromJDKProperties(factoryId, deprecatedFactoryId);
if (className != null) {
Object result = newInstance(className, defaultClassName, tccl);
if (result != null) {
return (T) result;
}
}
// standard services: java.util.ServiceLoader
T factory = ServiceLoaderUtil.firstByServiceLoader(
factoryClass,
logger,
EXCEPTION_HANDLER);
if (factory != null) {
return factory;
}
// try to find services in CLASSPATH
className = fromMetaInfServices(deprecatedFactoryId, tccl);
if (className != null) {
logger.log(Level.WARNING,
"Using deprecated META-INF/services mechanism with non-standard property: {0}. " +
"Property {1} should be used instead.",
new Object[]{deprecatedFactoryId, factoryId});
Object result = newInstance(className, defaultClassName, tccl);
if (result != null) {
return (T) result;
}
}
// If not found and fallback should not be tried, return a null result.
if (!tryFallback)
return null;
// We didn't find the class through the usual means so try the default
// (built in) factory if specified.
if (defaultClassName == null) {
throw new SOAPException(
"Provider for " + factoryId + " cannot be found", null);
}
return (T) newInstance(defaultClassName, defaultClassName, tccl);
}
// in most cases there is no deprecated factory id
static T find(Class factoryClass,
String defaultClassName,
boolean tryFallback) throws SOAPException {
return find(factoryClass, defaultClassName, tryFallback, null);
}
private static Object newInstance(String className, String defaultClassName, ClassLoader tccl) throws SOAPException {
return ServiceLoaderUtil.newInstance(
className,
defaultClassName,
tccl,
EXCEPTION_HANDLER);
}
// used only for deprecatedFactoryId;
// proper factoryId searched by java.util.ServiceLoader
private static String fromMetaInfServices(String deprecatedFactoryId, ClassLoader tccl) {
String serviceId = "META-INF/services/" + deprecatedFactoryId;
logger.log(Level.FINE, "Checking deprecated {0} resource", serviceId);
try (InputStream is =
tccl == null ?
ClassLoader.getSystemResourceAsStream(serviceId)
:
tccl.getResourceAsStream(serviceId)) {
if (is != null) {
String factoryClassName;
try (InputStreamReader isr = new InputStreamReader(is, StandardCharsets.UTF_8);
BufferedReader rd = new BufferedReader(isr)) {
factoryClassName = rd.readLine();
}
logFound(factoryClassName);
if (factoryClassName != null && !"".equals(factoryClassName)) {
return factoryClassName;
}
}
} catch (IOException e) {
// keep original behavior
}
return null;
}
private static String fromJDKProperties(String factoryId, String deprecatedFactoryId) {
Path path = null;
try {
String JAVA_HOME = getSystemProperty("java.home");
path = Paths.get(JAVA_HOME, "conf", "jaxm.properties");
logger.log(Level.FINE, "Checking configuration in {0}", path);
// to ensure backwards compatibility
if (!Files.exists(path)) {
path = Paths.get(JAVA_HOME, "lib", "jaxm.properties");
}
logger.log(Level.FINE, "Checking configuration in {0}", path);
if (Files.exists(path)) {
Properties props = new Properties();
try (InputStream inputStream = Files.newInputStream(path)) {
props.load(inputStream);
}
// standard property
logger.log(Level.FINE, "Checking property {0}", factoryId);
String factoryClassName = props.getProperty(factoryId);
logFound(factoryClassName);
if (factoryClassName != null) {
return factoryClassName;
}
// deprecated property
if (deprecatedFactoryId != null) {
logger.log(Level.FINE, "Checking deprecated property {0}", deprecatedFactoryId);
factoryClassName = props.getProperty(deprecatedFactoryId);
logFound(factoryClassName);
if (factoryClassName != null) {
logger.log(Level.WARNING,
"Using non-standard property: {0}. Property {1} should be used instead.",
new Object[]{deprecatedFactoryId, factoryId});
return factoryClassName;
}
}
}
} catch (Exception ignored) {
logger.log(Level.SEVERE, "Error reading SAAJ configuration from [" + path +
"] file. Check it is accessible and has correct format.", ignored);
}
return null;
}
private static String fromSystemProperty(String factoryId, String deprecatedFactoryId) {
String systemProp = getSystemProperty(factoryId);
if (systemProp != null) {
return systemProp;
}
if (deprecatedFactoryId != null) {
systemProp = getSystemProperty(deprecatedFactoryId);
if (systemProp != null) {
logger.log(Level.WARNING,
"Using non-standard property: {0}. Property {1} should be used instead.",
new Object[] {deprecatedFactoryId, factoryId});
return systemProp;
}
}
return null;
}
private static String getSystemProperty(final String property) {
logger.log(Level.FINE, "Checking system property {0}", property);
String value = AccessController.doPrivileged(new PrivilegedAction() {
@Override
public String run() {
return System.getProperty(property);
}
});
logFound(value);
return value;
}
private static void logFound(String value) {
if (value != null) {
logger.log(Level.FINE, " found {0}", value);
} else {
logger.log(Level.FINE, " not found");
}
}
}