| Methods Summary |
|---|
| private javax.xml.xpath.XPathFactory | _newFactory(java.lang.String uri)Lookup a {@link XPathFactory} for the given object model.
XPathFactory xpathFactory;
String propertyName = SERVICE_CLASS.getName() + ":" + uri;
// system property look up
try {
debugPrintln("Looking up system property '"+propertyName+"'" );
String r = ss.getSystemProperty(propertyName);
if(r!=null) {
debugPrintln("The value is '"+r+"'");
xpathFactory = createInstance(r);
if(xpathFactory != null) return xpathFactory;
} else
debugPrintln("The property is undefined.");
} catch( Throwable t ) {
if( debug ) {
debugPrintln("failed to look up system property '"+propertyName+"'" );
t.printStackTrace();
}
}
String javah = ss.getSystemProperty( "java.home" );
String configFile = javah + File.separator +
"lib" + File.separator + "jaxp.properties";
String factoryClassName = null ;
// try to read from $java.home/lib/jaxp.properties
try {
if(firstTime){
synchronized(cacheProps){
if(firstTime){
File f=new File( configFile );
firstTime = false;
if(ss.doesFileExist(f)){
debugPrintln("Read properties file " + f);
cacheProps.load(ss.getFileInputStream(f));
}
}
}
}
factoryClassName = cacheProps.getProperty(propertyName);
debugPrintln("found " + factoryClassName + " in $java.home/jaxp.properties");
if (factoryClassName != null) {
xpathFactory = createInstance(factoryClassName);
if(xpathFactory != null){
return xpathFactory;
}
}
} catch (Exception ex) {
if (debug) {
ex.printStackTrace();
}
}
// try META-INF/services files
Iterator sitr = createServiceFileIterator();
while(sitr.hasNext()) {
URL resource = (URL)sitr.next();
debugPrintln("looking into " + resource);
try {
xpathFactory = loadFromService(uri, resource.toExternalForm(),
ss.getURLInputStream(resource));
if (xpathFactory != null) {
return xpathFactory;
}
} catch(IOException e) {
if( debug ) {
debugPrintln("failed to read "+resource);
e.printStackTrace();
}
}
}
// platform default
if(uri.equals(XPathFactory.DEFAULT_OBJECT_MODEL_URI)) {
debugPrintln("attempting to use the platform default W3C DOM XPath lib");
return createInstance("com.sun.org.apache.xpath.internal.jaxp.XPathFactoryImpl");
}
debugPrintln("all things were tried, but none was found. bailing out.");
return null;
|
| private java.lang.Class | createClass(java.lang.String className)Create class using appropriate ClassLoader.
Class clazz;
// use approprite ClassLoader
try {
if (classLoader != null) {
clazz = classLoader.loadClass(className);
} else {
clazz = Class.forName(className);
}
} catch (Throwable t) {
if(debug) t.printStackTrace();
return null;
}
return clazz;
|
| javax.xml.xpath.XPathFactory | createInstance(java.lang.String className)Creates an instance of the specified and returns it.
XPathFactory xPathFactory = null;
debugPrintln("createInstance(" + className + ")");
// get Class from className
Class clazz = createClass(className);
if (clazz == null) {
debugPrintln("failed to getClass(" + className + ")");
return null;
}
debugPrintln("loaded " + className + " from " + which(clazz));
// instantiate Class as a XPathFactory
try {
xPathFactory = (XPathFactory) clazz.newInstance();
} catch (ClassCastException classCastException) {
debugPrintln("could not instantiate " + clazz.getName());
if (debug) {
classCastException.printStackTrace();
}
return null;
} catch (IllegalAccessException illegalAccessException) {
debugPrintln("could not instantiate " + clazz.getName());
if (debug) {
illegalAccessException.printStackTrace();
}
return null;
} catch (InstantiationException instantiationException) {
debugPrintln("could not instantiate " + clazz.getName());
if (debug) {
instantiationException.printStackTrace();
}
return null;
}
return xPathFactory;
|
| private java.util.Iterator | createServiceFileIterator()Returns an {@link Iterator} that enumerates all
the META-INF/services files that we care.
if (classLoader == null) {
return new SingleIterator() {
protected Object value() {
ClassLoader classLoader = XPathFactoryFinder.class.getClassLoader();
return ss.getResourceAsURL(classLoader, SERVICE_ID);
//return (ClassLoader.getSystemResource( SERVICE_ID ));
}
};
} else {
try {
//final Enumeration e = classLoader.getResources(SERVICE_ID);
final Enumeration e = ss.getResources(classLoader, SERVICE_ID);
if(!e.hasMoreElements()) {
debugPrintln("no "+SERVICE_ID+" file was found");
}
// wrap it into an Iterator.
return new Iterator() {
public void remove() {
throw new UnsupportedOperationException();
}
public boolean hasNext() {
return e.hasMoreElements();
}
public Object next() {
return e.nextElement();
}
};
} catch (IOException e) {
debugPrintln("failed to enumerate resources "+SERVICE_ID);
if(debug) e.printStackTrace();
return new ArrayList().iterator(); // empty iterator
}
}
|
| private void | debugDisplayClassLoader()
try {
if( classLoader == ss.getContextClassLoader() ) {
debugPrintln("using thread context class loader ("+classLoader+") for search");
return;
}
} catch( Throwable _ ) {
; // getContextClassLoader() undefined in JDK1.1
}
if( classLoader==ClassLoader.getSystemClassLoader() ) {
debugPrintln("using system class loader ("+classLoader+") for search");
return;
}
debugPrintln("using class loader ("+classLoader+") for search");
|
| private static void | debugPrintln(java.lang.String msg)Conditional debug printing.
if (debug) {
System.err.println("JAXP: " + msg);
}
|
| private javax.xml.xpath.XPathFactory | loadFromProperty(java.lang.String keyName, java.lang.String resourceName, java.io.InputStream in)Looks up a value in a property file
while producing all sorts of debug messages.
debugPrintln("Reading "+resourceName );
Properties props = new Properties();
props.load(in);
in.close();
String factoryClassName = props.getProperty(keyName);
if(factoryClassName != null){
debugPrintln("found "+keyName+" = " + factoryClassName);
return createInstance(factoryClassName);
} else {
debugPrintln(keyName+" is not in the property file");
return null;
}
|
| private javax.xml.xpath.XPathFactory | loadFromService(java.lang.String objectModel, java.lang.String inputName, java.io.InputStream in)Look up a value in a property file.
Set debug to true to trace property evaluation.
XPathFactory xPathFactory = null;
final Class[] stringClassArray = {"".getClass()};
final Object[] objectModelObjectArray = {objectModel};
final String isObjectModelSupportedMethod = "isObjectModelSupported";
debugPrintln("Reading " + inputName);
// read from InputStream until a match is found
BufferedReader configFile = new BufferedReader(new InputStreamReader(in));
String line = null;
while ((line = configFile.readLine()) != null) {
// '#' is comment char
int comment = line.indexOf("#");
switch (comment) {
case -1: break; // no comment
case 0: line = ""; break; // entire line is a comment
default: line = line.substring(0, comment); break; // trim comment
}
// trim whitespace
line = line.trim();
// any content left on line?
if (line.length() == 0) {
continue;
}
// line content is now the name of the class
Class clazz = createClass(line);
if (clazz == null) {
continue;
}
// create an instance of the Class
try {
xPathFactory = (XPathFactory) clazz.newInstance();
} catch (ClassCastException classCastExcpetion) {
xPathFactory = null;
continue;
} catch (InstantiationException instantiationException) {
xPathFactory = null;
continue;
} catch (IllegalAccessException illegalAccessException) {
xPathFactory = null;
continue;
}
// does this Class support desired object model?
try {
Method isObjectModelSupported = clazz.getMethod(isObjectModelSupportedMethod, stringClassArray);
Boolean supported = (Boolean) isObjectModelSupported.invoke(xPathFactory, objectModelObjectArray);
if (supported.booleanValue()) {
break;
}
} catch (NoSuchMethodException noSuchMethodException) {
} catch (IllegalAccessException illegalAccessException) {
} catch (InvocationTargetException invocationTargetException) {
}
xPathFactory = null;
}
// clean up
configFile.close();
// return new instance of XPathFactory or null
return xPathFactory;
|
| public javax.xml.xpath.XPathFactory | newFactory(java.lang.String uri)Creates a new {@link XPathFactory} object for the specified
schema language.
if(uri==null) throw new NullPointerException();
XPathFactory f = _newFactory(uri);
if (f != null) {
debugPrintln("factory '" + f.getClass().getName() + "' was found for " + uri);
} else {
debugPrintln("unable to find a factory for " + uri);
}
return f;
|
| private static java.lang.String | which(java.lang.Class clazz)
return which( clazz.getName(), clazz.getClassLoader() );
|
| private static java.lang.String | which(java.lang.String classname, java.lang.ClassLoader loader)Search the specified classloader for the given classname.
String classnameAsResource = classname.replace('.", '/") + ".class";
if( loader==null ) loader = ClassLoader.getSystemClassLoader();
//URL it = loader.getResource(classnameAsResource);
URL it = ss.getResourceAsURL(loader, classnameAsResource);
if (it != null) {
return it.toString();
} else {
return null;
}
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