/*
* Copyright 2011 JBoss, by Red Hat, Inc
*
* Licensed under the Apache License, Version 2.0 (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.jboss.errai.enterprise.rebind;
import java.util.Collection;
import javax.ws.rs.Path;
import javax.ws.rs.ext.Provider;
import org.jboss.errai.codegen.Parameter;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.Variable;
import org.jboss.errai.codegen.builder.ClassStructureBuilder;
import org.jboss.errai.codegen.builder.ContextualStatementBuilder;
import org.jboss.errai.codegen.builder.impl.ClassBuilder;
import org.jboss.errai.codegen.meta.MetaClass;
import org.jboss.errai.codegen.meta.MetaMethod;
import org.jboss.errai.codegen.util.ProxyUtil;
import org.jboss.errai.codegen.util.Stmt;
import org.jboss.errai.common.client.api.ErrorCallback;
import org.jboss.errai.common.client.api.RemoteCallback;
import org.jboss.errai.common.metadata.RebindUtils;
import org.jboss.errai.config.util.ClassScanner;
import org.jboss.errai.enterprise.client.jaxrs.AbstractJaxrsProxy;
import org.jboss.errai.enterprise.client.jaxrs.ClientExceptionMapper;
import org.jboss.errai.enterprise.shared.api.annotations.MapsFrom;
import com.google.gwt.core.ext.GeneratorContext;
/**
* Generates a JAX-RS remote proxy.
*
* @author Christian Sadilek <csadilek@redhat.com>
*/
public class JaxrsProxyGenerator {
private MetaClass remote = null;
private final JaxrsHeaders headers;
private final String rootResourcePath;
private final GeneratorContext context;
public JaxrsProxyGenerator(MetaClass remote, final GeneratorContext context) {
this.remote = remote;
this.context = context;
this.rootResourcePath = remote.getAnnotation(Path.class).value();
this.headers = JaxrsHeaders.fromClass(remote);
}
public ClassStructureBuilder<?> generate() {
String safeProxyClassName = remote.getFullyQualifiedName().replace('.', '_') + "Impl";
ClassStructureBuilder<?> classBuilder =
ClassBuilder.define(safeProxyClassName, AbstractJaxrsProxy.class)
.packageScope()
.implementsInterface(remote)
.body()
.privateField("remoteCallback", RemoteCallback.class)
.finish()
.privateField("errorCallback", ErrorCallback.class)
.finish()
.publicConstructor()
.append(generateCtor())
.finish()
.publicMethod(RemoteCallback.class, "getRemoteCallback")
.append(Stmt.loadClassMember("remoteCallback").returnValue())
.finish()
.publicMethod(void.class, "setRemoteCallback", Parameter.of(RemoteCallback.class, "callback"))
.append(Stmt.loadClassMember("remoteCallback").assignValue(Variable.get("callback")))
.finish()
.publicMethod(ErrorCallback.class, "getErrorCallback")
.append(Stmt.loadClassMember("errorCallback").returnValue())
.finish()
.publicMethod(void.class, "setErrorCallback", Parameter.of(ErrorCallback.class, "callback"))
.append(Stmt.loadClassMember("errorCallback").assignValue(Variable.get("callback")))
.finish();
for (MetaMethod method : remote.getMethods()) {
if (ProxyUtil.shouldProxyMethod(method)) {
JaxrsResourceMethod resourceMethod = new JaxrsResourceMethod(method, headers, rootResourcePath);
new JaxrsProxyMethodGenerator(classBuilder, resourceMethod, context).generate();
}
}
return classBuilder;
}
/**
* @return the generated body of the proxy's constructor
*/
private Statement generateCtor() {
// Try to find an ClientExceptionMapper that applies to the remote REST interface
Collection<MetaClass> providers = ClassScanner.getTypesAnnotatedWith(Provider.class,
RebindUtils.findTranslatablePackages(context), context);
MetaClass exceptionMapperClass = null;
for (MetaClass metaClass : providers) {
if (!metaClass.isAbstract() && metaClass.isAssignableTo(ClientExceptionMapper.class)) {
MapsFrom mapsFrom = metaClass.getAnnotation(MapsFrom.class);
if (mapsFrom == null && exceptionMapperClass == null) {
// Default mapper
exceptionMapperClass = metaClass;
} else {
Class<?>[] classes = mapsFrom.value();
if (classes != null) {
for (Class<?> class1 : classes) {
if (class1.getName().equals(this.remote.getFullyQualifiedName())) {
exceptionMapperClass = metaClass;
break;
}
}
}
}
}
}
// If we found one, create it in the c'tor and assign it to the proxy's exceptionMapper field
if (exceptionMapperClass != null) {
ContextualStatementBuilder setMapper = Stmt.loadVariable("this").invoke("setExceptionMapper",
Stmt.newObject(exceptionMapperClass));
return setMapper;
} else {
return Stmt.returnVoid();
}
}
}