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package com.vaadin.terminal.gwt.widgetsetutils;
import java.io.PrintWriter;
import com.google.gwt.core.ext.Generator;
import com.google.gwt.core.ext.GeneratorContext;
import com.google.gwt.core.ext.TreeLogger;
import com.google.gwt.core.ext.TreeLogger.Type;
import com.google.gwt.core.ext.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
import com.google.gwt.core.ext.typeinfo.JMethod;
import com.google.gwt.core.ext.typeinfo.JParameter;
import com.google.gwt.core.ext.typeinfo.TypeOracle;
import com.google.gwt.user.rebind.ClassSourceFileComposerFactory;
import com.google.gwt.user.rebind.SourceWriter;
import com.vaadin.terminal.gwt.client.ApplicationConnection;
import com.vaadin.terminal.gwt.client.communication.ClientToServerRpc;
import com.vaadin.terminal.gwt.client.communication.ClientToServerRpc.InitializableClientToServerRpc;
import com.vaadin.terminal.gwt.client.communication.MethodInvocation;
/**
* GWT generator that creates client side proxy classes for making RPC calls
* from the client to the server.
*
* GWT.create() calls for interfaces extending {@link ClientToServerRpc} are
* affected, and a proxy implementation is created. Note that the init(...)
* method of the proxy must be called before the proxy is used.
*
* @since 7.0
*/
public class RpcProxyGenerator extends Generator {
@Override
public String generate(TreeLogger logger, GeneratorContext ctx,
String requestedClassName) throws UnableToCompleteException {
Type logType = TreeLogger.INFO;
logger.log(TreeLogger.INFO, "Running RpcProxyGenerator", null);
TypeOracle typeOracle = ctx.getTypeOracle();
assert (typeOracle != null);
JClassType requestedType = typeOracle.findType(requestedClassName);
if (requestedType == null) {
logger.log(TreeLogger.ERROR, "Unable to find metadata for type '"
+ requestedClassName + "'", null);
throw new UnableToCompleteException();
}
String generatedClassName = "ClientToServerRpc_"
+ requestedType.getName().replaceAll("[$.]", "_");
JClassType initializableInterface = typeOracle
.findType(InitializableClientToServerRpc.class
.getCanonicalName());
ClassSourceFileComposerFactory composer = new ClassSourceFileComposerFactory(
requestedType.getPackage().getName(), generatedClassName);
composer.addImplementedInterface(requestedType.getQualifiedSourceName());
composer.addImplementedInterface(initializableInterface
.getQualifiedSourceName());
composer.addImport(MethodInvocation.class.getCanonicalName());
logger.log(logType,
"Generating client proxy for remote service interface '"
+ requestedType.getQualifiedSourceName() + "'");
PrintWriter printWriter = ctx.tryCreate(logger,
composer.getCreatedPackage(),
composer.getCreatedClassShortName());
if (printWriter != null) {
SourceWriter writer = composer.createSourceWriter(ctx, printWriter);
// constructor
writer.println("public " + generatedClassName + "() {}");
// initialization etc.
writeCommonFieldsAndMethods(logger, writer, typeOracle);
// actual proxy methods forwarding calls to the server
writeRemoteProxyMethods(logger, writer, typeOracle, requestedType,
requestedType.isClassOrInterface().getMethods());
// End of class
writer.outdent();
writer.println("}");
ctx.commit(logger, printWriter);
}
return composer.getCreatedClassName();
}
private void writeCommonFieldsAndMethods(TreeLogger logger,
SourceWriter writer, TypeOracle typeOracle) {
JClassType applicationConnectionClass = typeOracle
.findType(ApplicationConnection.class.getCanonicalName());
// fields
writer.println("private String paintableId;");
writer.println("private "
+ applicationConnectionClass.getQualifiedSourceName()
+ " client;");
// init method from the RPC interface
writer.println("public void initRpc(String paintableId, "
+ applicationConnectionClass.getQualifiedSourceName()
+ " client) {");
writer.indent();
writer.println("this.paintableId = paintableId;");
writer.println("this.client = client;");
writer.outdent();
writer.println("}");
}
private static void writeRemoteProxyMethods(TreeLogger logger,
SourceWriter writer, TypeOracle typeOracle,
JClassType requestedType, JMethod[] methods) {
for (JMethod m : methods) {
writer.print(m.getReadableDeclaration(false, false, false, false,
true));
writer.println(" {");
writer.indent();
writer.print("client.addMethodInvocationToQueue(new MethodInvocation(paintableId, \""
+ requestedType.getQualifiedBinaryName() + "\", \"");
writer.print(m.getName());
writer.print("\", new Object[] {");
// new Object[] { ... } for parameters - autoboxing etc. by the
// compiler
JParameter[] parameters = m.getParameters();
boolean first = true;
for (JParameter p : parameters) {
if (!first) {
writer.print(", ");
}
first = false;
writer.print(p.getName());
}
writer.println("}), true);");
writer.outdent();
writer.println("}");
}
}
}
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