Java Code Examples for java.lang.reflect.Proxy#getProxyClass()

/**
 * Return a proxy class that implements the interfaces named in a proxy
 * class descriptor. Do this using the class loader assigned to this
 * Context.
 */
@Override
protected Class<?> resolveProxyClass(String[] interfaces)
        throws IOException, ClassNotFoundException {

    Class<?>[] cinterfaces = new Class[interfaces.length];
    for (int i = 0; i < interfaces.length; i++) {
        cinterfaces[i] = classLoader.loadClass(interfaces[i]);
    }

    try {
        return Proxy.getProxyClass(classLoader, cinterfaces);
    } catch (IllegalArgumentException e) {
        throw new ClassNotFoundException(null, e);
    }
}
 

public void run() throws Exception {
    boolean hasAccess = loader != null || hasAccess();
    try {
        proxyClass = Proxy.getProxyClass(loader, interfaces);
        if (!hasAccess) {
            throw new RuntimeException("should have no permission to create proxy class");
        }
    } catch (AccessControlException e) {
        if (hasAccess) {
            throw e;
        }
        if (e.getPermission().getClass() != RuntimePermission.class ||
                !e.getPermission().getName().equals("getClassLoader")) {
            throw e;
        }
        return;
    }

    if (Modifier.isPublic(proxyClass.getModifiers())) {
        throw new RuntimeException(proxyClass + " must be non-public");
    }
    newProxyInstance();
    newInstanceFromConstructor(proxyClass);
}
 

/**
 * Generate proxy class descriptors.
 */
ObjectStreamClass[] genDescs() {
    ClassLoader ldr = ProxyClassDesc.class.getClassLoader();
    Class[] ifaces = new Class[3];
    Class[] a =
        new Class[] { A1.class, A2.class, A3.class, A4.class, A5.class };
    Class[] b =
        new Class[] { B1.class, B2.class, B3.class, B4.class, B5.class };
    Class[] c =
        new Class[] { C1.class, C2.class, C3.class, C4.class, C5.class };
    ObjectStreamClass[] descs =
        new ObjectStreamClass[a.length * b.length * c.length];
    int n = 0;
    for (int i = 0; i < a.length; i++) {
        ifaces[0] = a[i];
        for (int j = 0; j < b.length; j++) {
            ifaces[1] = b[j];
            for (int k = 0; k < c.length; k++) {
                ifaces[2] = c[k];
                Class proxyClass = Proxy.getProxyClass(ldr, ifaces);
                descs[n++] = ObjectStreamClass.lookup(proxyClass);
            }
        }
    }
    return descs;
}
 

/**
 * Generate proxy arrays.
 */
Proxy[][] genArrays(int size, int narrays) throws Exception {
    Class proxyClass =
        Proxy.getProxyClass(DummyInterface.class.getClassLoader(),
                new Class[] { DummyInterface.class });
    Constructor proxyCons =
        proxyClass.getConstructor(new Class[] { InvocationHandler.class });
    Object[] consArgs = new Object[] { new DummyHandler() };
    Proxy[][] arrays = new Proxy[narrays][size];
    for (int i = 0; i < narrays; i++) {
        for (int j = 0; j < size; j++) {
            arrays[i][j] = (Proxy) proxyCons.newInstance(consArgs);
        }
    }
    return arrays;
}
 

public void run() throws Exception {
    boolean hasAccess = loader != null || hasAccess();
    try {
        proxyClass = Proxy.getProxyClass(loader, interfaces);
        if (!hasAccess) {
            throw new RuntimeException("should have no permission to create proxy class");
        }
    } catch (AccessControlException e) {
        if (hasAccess) {
            throw e;
        }
        if (e.getPermission().getClass() != RuntimePermission.class ||
                !e.getPermission().getName().equals("getClassLoader")) {
            throw e;
        }
        return;
    }

    if (Modifier.isPublic(proxyClass.getModifiers())) {
        throw new RuntimeException(proxyClass + " must be non-public");
    }
    newProxyInstance();
    newInstanceFromConstructor(proxyClass);
}
 

public void run() throws Exception {
    boolean hasAccess = loader != null || hasAccess();
    try {
        proxyClass = Proxy.getProxyClass(loader, interfaces);
        if (!hasAccess) {
            throw new RuntimeException("should have no permission to create proxy class");
        }
    } catch (AccessControlException e) {
        if (hasAccess) {
            throw e;
        }
        if (e.getPermission().getClass() != RuntimePermission.class ||
                !e.getPermission().getName().equals("getClassLoader")) {
            throw e;
        }
        return;
    }

    if (Modifier.isPublic(proxyClass.getModifiers())) {
        throw new RuntimeException(proxyClass + " must be non-public");
    }
    newProxyInstance();
    newInstanceFromConstructor(proxyClass);
}
 

/**
 * Generate proxy arrays.
 */
Proxy[][] genArrays(int size, int narrays) throws Exception {
    Class proxyClass =
        Proxy.getProxyClass(DummyInterface.class.getClassLoader(),
                new Class[] { DummyInterface.class });
    Constructor proxyCons =
        proxyClass.getConstructor(new Class[] { InvocationHandler.class });
    Object[] consArgs = new Object[] { new DummyHandler() };
    Proxy[][] arrays = new Proxy[narrays][size];
    for (int i = 0; i < narrays; i++) {
        for (int j = 0; j < size; j++) {
            arrays[i][j] = (Proxy) proxyCons.newInstance(consArgs);
        }
    }
    return arrays;
}
 

/**
 * Generate proxy class descriptors.
 */
ObjectStreamClass[] genDescs() {
    ClassLoader ldr = ProxyClassDesc.class.getClassLoader();
    Class[] ifaces = new Class[3];
    Class[] a =
        new Class[] { A1.class, A2.class, A3.class, A4.class, A5.class };
    Class[] b =
        new Class[] { B1.class, B2.class, B3.class, B4.class, B5.class };
    Class[] c =
        new Class[] { C1.class, C2.class, C3.class, C4.class, C5.class };
    ObjectStreamClass[] descs =
        new ObjectStreamClass[a.length * b.length * c.length];
    int n = 0;
    for (int i = 0; i < a.length; i++) {
        ifaces[0] = a[i];
        for (int j = 0; j < b.length; j++) {
            ifaces[1] = b[j];
            for (int k = 0; k < c.length; k++) {
                ifaces[2] = c[k];
                Class proxyClass = Proxy.getProxyClass(ldr, ifaces);
                descs[n++] = ObjectStreamClass.lookup(proxyClass);
            }
        }
    }
    return descs;
}
 

/**
 * Generate proxy object array of the given size.
 */
Proxy[] genProxies(int size) throws Exception {
    Class proxyClass =
        Proxy.getProxyClass(DummyInterface.class.getClassLoader(),
                new Class[] { DummyInterface.class });
    Constructor proxyCons =
        proxyClass.getConstructor(new Class[] { InvocationHandler.class });
    Object[] consArgs = new Object[] { new DummyHandler() };
    Proxy[] proxies = new Proxy[size];

    for (int i = 0; i < size; i++)
        proxies[i] = (Proxy) proxyCons.newInstance(consArgs);

    return proxies;
}
 

@Override
protected Class<?> resolveProxyClass(String[] interfaces) throws IOException, ClassNotFoundException {
	if (classLoader != null) {
		ClassLoader nonPublicLoader = null;
		boolean hasNonPublicInterface = false;

		// define proxy in class loader of non-public interface(s), if any
		Class<?>[] classObjs = new Class<?>[interfaces.length];
		for (int i = 0; i < interfaces.length; i++) {
			Class<?> cl = Class.forName(interfaces[i], false, classLoader);
			if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
				if (hasNonPublicInterface) {
					if (nonPublicLoader != cl.getClassLoader()) {
						throw new IllegalAccessError(
							"conflicting non-public interface class loaders");
					}
				} else {
					nonPublicLoader = cl.getClassLoader();
					hasNonPublicInterface = true;
				}
			}
			classObjs[i] = cl;
		}
		try {
			return Proxy.getProxyClass(
				hasNonPublicInterface ? nonPublicLoader : classLoader, classObjs);
		} catch (IllegalArgumentException e) {
			throw new ClassNotFoundException(null, e);
		}
	}

	return super.resolveProxyClass(interfaces);
}
 

/**
 * Define a proxy class in the given class loader.  The proxy
 * class will implement the given interfaces Classes.
 */
private static Class<?> loadProxyClass(ClassLoader loader, Class<?>[] interfaces)
    throws ClassNotFoundException
{
    try {
        return Proxy.getProxyClass(loader, interfaces);
    } catch (IllegalArgumentException e) {
        throw new ClassNotFoundException(
            "error creating dynamic proxy class", e);
    }
}
 

protected Class<?> resolveProxyClass(String[] interfaces) throws
       IOException, ClassNotFoundException {
    ClassLoader nonPublicLoader = null;
    boolean hasNonPublicInterface = false;

    // define proxy in class loader of non-public interface(s), if any
    Class<?>[] classObjs = new Class<?>[interfaces.length];
    for (int i = 0; i < interfaces.length; i++) {
        Class<?> cl = Class.forName(interfaces[i], false, classLoader);
        if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
            if (hasNonPublicInterface) {
                if (nonPublicLoader != cl.getClassLoader()) {
                    throw new IllegalAccessError(
                       "conflicting non-public interface class loaders");
                }
            } else {
                nonPublicLoader = cl.getClassLoader();
                hasNonPublicInterface = true;
            }
        }
        classObjs[i] = cl;
    }
    try {
        return Proxy.getProxyClass(hasNonPublicInterface ?
               nonPublicLoader : classLoader, classObjs);
    } catch (IllegalArgumentException e) {
        throw new ClassNotFoundException(null, e);
    }
}
 

/**
 * Creates and caches a {@link java.lang.reflect.Constructor} used to instantiate the proxy object.
 * We cache this, since the creation of a constructor is fairly slow.
 * @param xa Use a XA connection
 * @return constructor used to instantiate the wrapper object
 * @throws NoSuchMethodException Failed to get a constructor
 */
public Constructor<?> getProxyConstructor(boolean xa) throws NoSuchMethodException {
    //cache the constructor
    if (proxyClassConstructor == null ) {
        Class<?> proxyClass = xa ?
            Proxy.getProxyClass(ConnectionPool.class.getClassLoader(), new Class[] {java.sql.Connection.class,javax.sql.PooledConnection.class, javax.sql.XAConnection.class}) :
            Proxy.getProxyClass(ConnectionPool.class.getClassLoader(), new Class[] {java.sql.Connection.class,javax.sql.PooledConnection.class});
        proxyClassConstructor = proxyClass.getConstructor(new Class[] { InvocationHandler.class });
    }
    return proxyClassConstructor;
}
 

protected Constructor<?> getResultSetConstructor() throws NoSuchMethodException {
    if (resultSetConstructor == null) {
        Class<?> proxyClass = Proxy.getProxyClass(StatementDecoratorInterceptor.class.getClassLoader(),
                new Class[] { ResultSet.class });
        resultSetConstructor = proxyClass.getConstructor(new Class[] { InvocationHandler.class });
    }
    return resultSetConstructor;
}
 

protected Class<?> resolveProxyClass(String[] interfaces) throws
       IOException, ClassNotFoundException {
    ClassLoader nonPublicLoader = null;
    boolean hasNonPublicInterface = false;

    // define proxy in class loader of non-public interface(s), if any
    Class<?>[] classObjs = new Class<?>[interfaces.length];
    for (int i = 0; i < interfaces.length; i++) {
        Class<?> cl = Class.forName(interfaces[i], false, classLoader);
        if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
            if (hasNonPublicInterface) {
                if (nonPublicLoader != cl.getClassLoader()) {
                    throw new IllegalAccessError(
                       "conflicting non-public interface class loaders");
                }
            } else {
                nonPublicLoader = cl.getClassLoader();
                hasNonPublicInterface = true;
            }
        }
        classObjs[i] = cl;
    }
    try {
        return Proxy.getProxyClass(hasNonPublicInterface ?
               nonPublicLoader : classLoader, classObjs);
    } catch (IllegalArgumentException e) {
        throw new ClassNotFoundException(null, e);
    }
}
 

/**
 * ObjectInputStream.resolveProxyClass has some funky way of using
 * the incorrect class loader to resolve proxy classes, let's do it our way instead
 */
@Override
protected Class<?> resolveProxyClass(String[] interfaces)
        throws IOException, ClassNotFoundException {

    ClassLoader latestLoader;
    if (classLoaders != null && classLoaders.length > 0) {
        latestLoader = classLoaders[0];
    } else {
        latestLoader = null;
    }
    ClassLoader nonPublicLoader = null;
    boolean hasNonPublicInterface = false;

    // define proxy in class loader of non-public interface(s), if any
    Class<?>[] classObjs = new Class[interfaces.length];
    for (int i = 0; i < interfaces.length; i++) {
        Class<?> cl = this.resolveClass(interfaces[i]);
        if (latestLoader==null) latestLoader = cl.getClassLoader();
        if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
            if (hasNonPublicInterface) {
                if (nonPublicLoader != cl.getClassLoader()) {
                    throw new IllegalAccessError(
                            sm.getString("replicationStream.conflict"));
                }
            } else {
                nonPublicLoader = cl.getClassLoader();
                hasNonPublicInterface = true;
            }
        }
        classObjs[i] = cl;
    }
    try {
        return Proxy.getProxyClass(hasNonPublicInterface ? nonPublicLoader
                : latestLoader, classObjs);
    } catch (IllegalArgumentException e) {
        throw new ClassNotFoundException(null, e);
    }
}
 

public static void main(String[] args) throws Exception {
    ClassLoader l = new Loader();
    Class i = Class.forName(CLASS_NAME, false, l);
    System.out.println(i);
    Class p = Proxy.getProxyClass(i.getClassLoader(), new Class[] { i });
    System.out.println(p);
}
 

public static Class<?> makeProxyClass(final ClassLoader cl, final Class<?>... ifaces) {
    return Proxy.getProxyClass(cl, ifaces);
}
 

protected Class<?> resolveProxyClass(String[] interfaces)
  throws IOException, ClassNotFoundException {

    Set<String> s = new HashSet<String>(interfaces.length);
    for (int i = 0; i < interfaces.length; i++) {
        s.add(interfaces[i]);
    }

    ClassLoader classLoader = map.get(s);
    if (classLoader == null) {
        return super.resolveProxyClass(interfaces);
    }

    // The code below is mostly copied from the superclass.
    ClassLoader nonPublicLoader = null;
    boolean hasNonPublicInterface = false;

    // define proxy in class loader of non-public interface(s), if any
    Class[] classObjs = new Class[interfaces.length];
    for (int i = 0; i < interfaces.length; i++) {
        Class cl = Class.forName(interfaces[i], false, classLoader);
        if ((cl.getModifiers() & Modifier.PUBLIC) == 0) {
            if (hasNonPublicInterface) {
                if (nonPublicLoader != cl.getClassLoader()) {
                    throw new IllegalAccessError(
                        "conflicting non-public interface class loaders");
                }
            } else {
                nonPublicLoader = cl.getClassLoader();
                hasNonPublicInterface = true;
            }
        }
        classObjs[i] = cl;
    }
    try {
        return Proxy.getProxyClass(hasNonPublicInterface ?
                                   nonPublicLoader : classLoader,
                                   classObjs);
    } catch (IllegalArgumentException e) {
        throw new ClassNotFoundException(null, e);
    }
}
 

/**
 * Create a composite interface Class for the given interfaces,
 * implementing the given interfaces in one single Class.
 * <p>This implementation builds a JDK proxy class for the given interfaces.
 * @param interfaces the interfaces to merge
 * @param classLoader the ClassLoader to create the composite Class in
 * @return the merged interface as Class
 * @throws IllegalArgumentException if the specified interfaces expose
 * conflicting method signatures (or a similar constraint is violated)
 * @see java.lang.reflect.Proxy#getProxyClass
 */
@SuppressWarnings("deprecation")
public static Class<?> createCompositeInterface(Class<?>[] interfaces, @Nullable ClassLoader classLoader) {
	Assert.notEmpty(interfaces, "Interfaces must not be empty");
	return Proxy.getProxyClass(classLoader, interfaces);
}