utility.java

java1.6众多例子参考

                } catch( Exception e ) {
                    // Exception is caught because of any of the 
                    // following reasons
                    // 1) POA is not associated with the TIE 
                    // 2) POA Policies for the tie-associated POA
                    //    does not support _this_object() call. 
		    throw wrapper.noPoa( e ) ;
                }
            }
            // Update the cache...
            entry = new StubEntry(stub,onlyMostDerived);
            tieToStubCache.put(tie,entry);
        } 
            
        return entry;
    }
                                   
    /*
     * If we loadStub(Tie,...) stashed away a tie which was
     * not connected, remove it from the cache and return
     * it.
     */
    public static Tie getAndForgetTie (org.omg.CORBA.Object stub) {
        synchronized (stubToTieCache) {
            return (Tie) stubToTieCache.remove(stub);
        }
    }
    
    /*
     * Remove any cached Stub for the given tie.
     */
    public static void purgeStubForTie (Tie tie) {
        StubEntry entry;
        synchronized (tieToStubCache) {
            entry = (StubEntry)tieToStubCache.remove(tie);
        }
	if (entry != null) {
            synchronized (stubToTieCache) {
                stubToTieCache.remove(entry.stub);
            }
	}
    }
    
    /*
     * Remove cached tie/servant pair.
     */
    public static void purgeTieAndServant (Tie tie) {
	synchronized (tieCache) {
	    Object target = tie.getTarget();
	    if (target != null)
		tieCache.remove(target);
	}
    }

    /*
     * Convert a RepId to a stubName...
     */
    public static String stubNameFromRepID (String repID) {
        
        // Convert the typeid to a RepositoryId instance, get
        // the className and mangle it as needed...

        RepositoryId id = RepositoryId.cache.getId(repID);
        String className = id.getClassName();
        
        if (id.isIDLType()) {
            className = idlStubName(className);
        } else {
            className = stubName(className);
        }
        return className;
    }
  
    
    /*
     * Load an RMI-IIOP Stub.  This is used in PortableRemoteObject.narrow.
     */
    public static Remote loadStub (org.omg.CORBA.Object narrowFrom,
                                   Class narrowTo) 
    {
        Remote result = null;
            
	try {
            // Get the codebase from the delegate to use when loading
            // the new stub, if possible...
            String codebase = null;
            try {
                // We can't assume that narrowFrom is a CORBA_2_3 stub, yet
                // it may have a 2_3 Delegate that provides a codebase.  Swallow
                // the ClassCastException otherwise.
		Delegate delegate = StubAdapter.getDelegate( narrowFrom ) ;
                codebase = ((org.omg.CORBA_2_3.portable.Delegate)delegate).
		    get_codebase(narrowFrom);

            } catch (ClassCastException e) {
		wrapper.classCastExceptionInLoadStub( e ) ;
            }

	    PresentationManager.StubFactoryFactory sff = 
		com.sun.corba.se.spi.orb.ORB.getStubFactoryFactory() ;
	    PresentationManager.StubFactory sf = sff.createStubFactory( 
		narrowTo.getName(), false, codebase, narrowTo, 
		narrowTo.getClassLoader() ) ;
	    result = (Remote)sf.makeStub() ;
	    StubAdapter.setDelegate( result, 
		StubAdapter.getDelegate( narrowFrom ) ) ;
        } catch (Exception err) {
	    wrapper.exceptionInLoadStub( err ) ;
        }
        
        return result;
    }
        
    /*
     * Load an RMI-IIOP Stub class.  This is used in the 
     * StaticStubFactoryFactory code.
     */
    public static Class loadStubClass(String repID,
                                      String remoteCodebase,
				      Class expectedType) 
	throws ClassNotFoundException 
    {	                                    
        // Get the repID and check for "" special case.
        // We should never be called with it (See CDRInputStream
        // and the loadStub() method)...
        
        if (repID.length() == 0) {
            throw new ClassNotFoundException();   
        }
        
        // Get the stubname from the repID and load
        // the class. If we have a valid 'sender', fall
        // back to using its codebase if we need to...
        String className = Utility.stubNameFromRepID(repID);
        ClassLoader expectedTypeClassLoader = (expectedType == null ? null : 
	    expectedType.getClassLoader());

        try {
              return loadClassOfType(className,
                                       remoteCodebase,
                                       expectedTypeClassLoader,
                                       expectedType,
                                       expectedTypeClassLoader);
        } catch (ClassNotFoundException e) {
	    return loadClassOfType(PackagePrefixChecker.packagePrefix() + className,
                                   remoteCodebase,
                                   expectedTypeClassLoader,
                                   expectedType,
                                   expectedTypeClassLoader);
        }
    }

    /**
     * Create an RMI stub name.
     */
    public static String stubName (String className) 
    {
	return stubName( className, false ) ;
    }

    public static String dynamicStubName( String className )
    {
	return stubName( className, true ) ;
    }

    private static String stubName( String className,
	boolean isDynamic ) 
    {
	String name = stubNameForCompiler( className, isDynamic ) ;
	if (PackagePrefixChecker.hasOffendingPrefix( name ))
	    name = PackagePrefixChecker.packagePrefix() + name ;
	return name ;
    }

    public static String stubNameForCompiler (String className) 
    {
	return stubNameForCompiler( className, false ) ;
    }

    private static String stubNameForCompiler( String className, 
	boolean isDynamic )
    {
        int index = className.indexOf('$');
        if (index < 0) {
            index = className.lastIndexOf('.');
        }

	String suffix = isDynamic ? DYNAMIC_STUB_SUFFIX : 
	    RMI_STUB_SUFFIX ;
    
        if (index > 0) {
            return className.substring(0,index+1) + STUB_PREFIX + 
		className.substring(index+1) + suffix;
        } else {
            return STUB_PREFIX + className + suffix;
        }
    }

    /**
     * Create an RMI tie name.
     */
    public static String tieName (String className) 
    {
        return
            PackagePrefixChecker.hasOffendingPrefix(tieNameForCompiler(className)) ?
            PackagePrefixChecker.packagePrefix() + tieNameForCompiler(className) :
            tieNameForCompiler(className);
    }

    public static String tieNameForCompiler (String className) 
    {
        int index = className.indexOf('$');
        if (index < 0) {
            index = className.lastIndexOf('.');
        }
        if (index > 0) {
            return className.substring(0,index+1) +
		STUB_PREFIX +
		className.substring(index+1) +
		TIE_SUFIX;
        } else {
            return STUB_PREFIX +
		className +
		TIE_SUFIX;
        }
    }

    /**
     * Throws the CORBA equivalent of a java.io.NotSerializableException
     */
    public static void throwNotSerializableForCorba(String className) {
	throw omgWrapper.notSerializable( CompletionStatus.COMPLETED_MAYBE, 
	    className ) ;
    }

    /**
     * Create an IDL stub name.
     */
    public static String idlStubName(String className) 
    {
        String result = null;
        int index = className.lastIndexOf('.');
        if (index > 0) {
            result = className.substring(0,index+1) + 
		STUB_PREFIX +
		className.substring(index+1) + 
		IDL_STUB_SUFFIX;
        } else {
            result = STUB_PREFIX +
		className +
		IDL_STUB_SUFFIX;
        }
        return result;
    }
    
    public static void printStackTrace() 
    {
	Throwable thr = new Throwable( "Printing stack trace:" ) ;
	thr.fillInStackTrace() ;
	thr.printStackTrace() ;
    }

    /**
     * Read an object reference from the input stream and narrow
     * it to the desired type.
     * @param in the stream to read from.
     * @throws ClassCastException if narrowFrom cannot be cast to narrowTo.
     */
    public static Object readObjectAndNarrow(InputStream in,
                                             Class narrowTo)
	throws ClassCastException 
    {
        Object result = in.read_Object();
	if (result != null) 
            return PortableRemoteObject.narrow(result, narrowTo);
	else
	    return null;
    }

    /**
     * Read an abstract interface type from the input stream and narrow
     * it to the desired type.
     * @param in the stream to read from.
     * @throws ClassCastException if narrowFrom cannot be cast to narrowTo.
     */
    public static Object readAbstractAndNarrow(
	org.omg.CORBA_2_3.portable.InputStream in, Class narrowTo)
	throws ClassCastException 
    {
        Object result = in.read_abstract_interface();
	if (result != null) 
            return PortableRemoteObject.narrow(result, narrowTo);
	else
	    return null;
    }


    /** Converts an Ascii Character into Hexadecimal digit
     */
    static int hexOf( char x )
    {
	int val;

        val = x - '0';
        if (val >=0 && val <= 9)
            return val;

        val = (x - 'a') + 10;
        if (val >= 10 && val <= 15)
            return val;

        val = (x - 'A') + 10;
        if (val >= 10 && val <= 15)
            return val;

	throw wrapper.badHexDigit() ;
    }
}

class StubEntry {
    org.omg.CORBA.Object stub;
    boolean mostDerived;
    
    StubEntry(org.omg.CORBA.Object stub, boolean mostDerived) {
        this.stub = stub;
        this.mostDerived = mostDerived;
    }
}