org.freedesktop.wayland.client.Proxy Maven / Gradle / Ivy
//Copyright 2015 Erik De Rijcke
//
//Licensed under the Apache License,Version2.0(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.freedesktop.wayland.client;
import com.sun.jna.Pointer;
import org.freedesktop.wayland.client.jna.WaylandClientLibrary;
import org.freedesktop.wayland.util.*;
import java.lang.reflect.Constructor;
import java.lang.reflect.InvocationTargetException;
import java.util.HashMap;
import java.util.Map;
/**
* Represents a protocol object on the client side.
*
* A {@code Proxy} acts as a client side proxy to an object existing in the
* compositor. The proxy is responsible for converting requests made by the
* clients with {@link #marshal(int)} into Wayland's wire format. Events
* coming from the compositor are also handled by the proxy, which will in
* turn call the implementation.
*
* With the exception of function {@link #setQueue(EventQueue)}, functions
* accessing a {@code Proxy} are not normally used by client code. Clients
* should normally use the higher level interface generated by the scanner to
* interact with compositor objects.
*
*
* @param Implementation type that will act as the listener for received events.
*/
public abstract class Proxy implements WaylandObject {
private static final Map>, Constructor>> PROXY_CONSTRUCTORS = new HashMap>, Constructor>>();
private final Pointer pointer;
private final int version;
private final I implementation;
private boolean valid;
/**
* @param pointer
* @param implementation The listener to be added to proxy
* @param version
*/
protected Proxy(final Pointer pointer,
final I implementation,
final int version) {
this.pointer = pointer;
this.valid = true;
this.implementation = implementation;
this.version = version;
ObjectCache.store(getNative(),
this);
//Special casing implementation. For some proxies the underlying native library provides its own implementation.
//We pass in a null implementation in those cases. (Eg Display proxy).
if (implementation != null) {
WaylandClientLibrary.INSTANCE()
.wl_proxy_add_dispatcher(getNative(),
Dispatcher.INSTANCE,
Pointer.NULL,
Pointer.NULL);
}
}
protected Proxy(final Pointer pointer) {
this(pointer,
null,
99);
}
//TODO add get(Pointer) method for each generated proxy
public int getVersion() {
return this.version;
}
//called from generated proxies
/**
* Prepare a request to be sent to the compositor
*
* This function is similar to {@link #marshalConstructor(int, Object, int, Class, Arguments)}, except
* it doesn't create proxies for new-id arguments.
*
* This should not normally be used by non-generated code.
*
* @param opcode Opcode of the request to be sent
* @param args Extra arguments for the given request
*/
protected void marshal(final int opcode,
final Arguments args) {
marshal(opcode,
args.getNative());
}
//called from generated proxies
/**
* @param opcode Opcode of the request to be sent
*
* @see {@link #marshal(int, Arguments)}
*/
protected void marshal(final int opcode) {
WaylandClientLibrary.INSTANCE()
.wl_proxy_marshal_array(getNative(),
opcode,
Pointer.NULL);
}
//called from generated proxies
protected void marshal(final int opcode,
final Pointer argsPointer) {
WaylandClientLibrary.INSTANCE()
.wl_proxy_marshal_array(getNative(),
opcode,
argsPointer);
}
//called from generated proxies
/**
* Prepare a request to be sent to the compositor
*
* Translates the request given by opcode and the extra arguments into the
* wire format and write it to the connection buffer.
*
* For new-id arguments, this function will allocate a new {@code Proxy}
* and send the ID to the server. The new {@code Proxy} will be returned
* on success or NULL on errror with errno set accordingly.
*
* This is intended to be used by language bindings and not in
* non-generated code.
*
* @param opcode Opcode of the request to be sent
* @param implementation The listener to use for the new proxy
* @param version The runtime version of the new proxy
* @param newProxyCls The type to use for the new proxy
* @param args Extra arguments for the given request
* @param implementation Type
* @param proxy Type
*
* @return a new proxy
*/
protected > T marshalConstructor(final int opcode,
final J implementation,
final int version,
final Class newProxyCls,
final Arguments args) {
return marshalConstructor(opcode,
implementation,
version,
newProxyCls,
args.getNative());
}
//called from generated proxies
protected > T marshalConstructor(final int opcode,
final J implementation,
final int version,
final Class newProxyCls,
final Pointer argsPointer) {
try {
final Pointer
wlProxy =
WaylandClientLibrary.INSTANCE()
.wl_proxy_marshal_array_constructor(getNative(),
opcode,
argsPointer,
InterfaceMeta.get(newProxyCls)
.getNative()
.getPointer());
return marshalProxy(wlProxy,
implementation,
version,
newProxyCls);
}
catch (final NoSuchMethodException e) {
throw new RuntimeException("Uh oh, this is a bug!",
e);
}
catch (final IllegalAccessException e) {
throw new RuntimeException("Uh oh, this is a bug!",
e);
}
catch (final InvocationTargetException e) {
throw new RuntimeException("Uh oh, this is a bug!",
e);
}
catch (final InstantiationException e) {
throw new RuntimeException("Uh oh, this is a bug!",
e);
}
}
protected > T marshalProxy(final Pointer pointer,
final J implementation,
final int version,
final Class newProxyCls) throws NoSuchMethodException,
IllegalAccessException,
InvocationTargetException,
InstantiationException {
Constructor> proxyConstructor = PROXY_CONSTRUCTORS.get(newProxyCls);
if (proxyConstructor == null) {
proxyConstructor = findMatchingConstructor(newProxyCls,
Pointer.class,
implementation.getClass(),
int.class);
PROXY_CONSTRUCTORS.put(newProxyCls,
proxyConstructor);
}
return (T) proxyConstructor.newInstance(pointer,
implementation,
version);
}
protected > Constructor findMatchingConstructor(final Class newProxyCls,
final Class pointerClass,
final Class implementationClass,
final Class intClass) throws NoSuchMethodException {
for (final Constructor constructor : newProxyCls.getConstructors()) {
final Class[] parameterTypes = constructor.getParameterTypes();
if (parameterTypes.length != 3) {
continue;
}
if (parameterTypes[0].isAssignableFrom(pointerClass) &&
parameterTypes[1].isAssignableFrom(implementationClass) &&
parameterTypes[2].isAssignableFrom(intClass)) {
return (Constructor) constructor;
}
}
throw new NoSuchMethodException();
}
@Override
public boolean isValid() {
return this.valid;
}
/**
* Destroy a proxy object
*/
public void destroy() {
if (isValid()) {
this.valid = false;
WaylandClientLibrary.INSTANCE()
.wl_proxy_destroy(getNative());
ObjectCache.remove(getNative());
}
}
/**
* Get a proxy's listener
*
* Gets the proxy's listener; which is the implementation set when this proxy was constructed.
*
* This function is useful in client with multiple listeners on the same
* interface to allow the identification of which code to execute.
*
* @return The proxy's listener or NULL if no listener is set
*/
public I getImplementation() {
return this.implementation;
}
/**
* Get the id of a proxy object
*
* @return The id the object associated with the proxy
*/
public int getId() {
return WaylandClientLibrary.INSTANCE()
.wl_proxy_get_id(getNative());
}
/**
* Assign a proxy to an event queue
*
* Assign proxy to event queue. Events coming from {@code proxy} will be
* queued in {@code queue} instead of the display's main queue.
*
* @param queue The event queue that will handle this proxy
*
* @see Display#dispatchQueue(EventQueue)
*/
public void setQueue(final EventQueue queue) {
WaylandClientLibrary.INSTANCE()
.wl_proxy_set_queue(getNative(),
queue.getNative());
}
public Pointer getNative() {
return this.pointer;
}
@Override
public boolean equals(final Object o) {
if (this == o) {
return true;
}
if (!(o instanceof Proxy)) {
return false;
}
final Proxy proxy = (Proxy) o;
return getNative().equals(proxy.getNative());
}
@Override
public int hashCode() {
return getNative().hashCode();
}
@Override
protected void finalize() throws Throwable {
destroy();
super.finalize();
}
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