/*
* 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.io.File;
import java.io.PrintWriter;
import javax.ws.rs.Path;
import org.jboss.errai.bus.client.framework.RemoteServiceProxyFactory;
import org.jboss.errai.codegen.framework.InnerClass;
import org.jboss.errai.codegen.framework.builder.ClassStructureBuilder;
import org.jboss.errai.codegen.framework.builder.MethodBlockBuilder;
import org.jboss.errai.codegen.framework.builder.impl.ClassBuilder;
import org.jboss.errai.codegen.framework.meta.impl.build.BuildMetaClass;
import org.jboss.errai.codegen.framework.util.Stmt;
import org.jboss.errai.common.metadata.MetaDataScanner;
import org.jboss.errai.common.metadata.RebindUtils;
import org.jboss.errai.common.metadata.ScannerSingleton;
import org.jboss.errai.enterprise.client.jaxrs.JaxrsProxyLoader;
import org.slf4j.Logger;
import org.slf4j.LoggerFactory;
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.UnableToCompleteException;
import com.google.gwt.core.ext.typeinfo.JClassType;
/**
* Generates the JAX-RS proxy loader.
*
* @author Christian Sadilek <csadilek@redhat.com>
*/
public class JaxrsProxyLoaderGenerator extends Generator {
private Logger log = LoggerFactory.getLogger(JaxrsProxyLoaderGenerator.class);
@Override
public String generate(TreeLogger logger, GeneratorContext context, String typeName)
throws UnableToCompleteException {
String packageName = null;
String className = null;
try {
JClassType classType = context.getTypeOracle().getType(typeName);
if (classType.isInterface() == null) {
logger.log(TreeLogger.ERROR, typeName + "is not an interface.");
throw new RuntimeException("invalid type: not an interface");
}
packageName = classType.getPackage().getName();
className = classType.getSimpleSourceName() + "Impl";
PrintWriter printWriter = context.tryCreate(logger, packageName, className);
// If code has not already been generated.
if (printWriter != null) {
printWriter.append(generate(context, logger, className));
context.commit(logger, printWriter);
}
}
catch (Throwable e) {
logger.log(TreeLogger.ERROR, "Error generating JAX-RS extensions", e);
}
return packageName + "." + className;
}
private String generate(final GeneratorContext context, final TreeLogger logger, final String className) {
File fileCacheDir = RebindUtils.getErraiCacheDir();
File cacheFile = new File(fileCacheDir.getAbsolutePath() + "/" + className + ".java");
String gen;
if (RebindUtils.hasClasspathChangedForAnnotatedWith(Path.class) || !cacheFile.exists()) {
log.info("generating jax-rs proxy loader class.");
gen = generate(context, logger);
RebindUtils.writeStringToFile(cacheFile, gen);
}
else {
log.info("nothing has changed. using cached jax-rs proxy loader class.");
gen = RebindUtils.readFileToString(cacheFile);
}
return gen;
}
private String generate(final GeneratorContext context, final TreeLogger logger) {
MetaDataScanner scanner = ScannerSingleton.getOrCreateInstance();
ClassStructureBuilder<?> classBuilder = ClassBuilder.implement(JaxrsProxyLoader.class);
MethodBlockBuilder<?> loadProxies = classBuilder.publicMethod(void.class, "loadProxies");
for (Class<?> remote : scanner.getTypesAnnotatedWith(Path.class, RebindUtils.findTranslatablePackages(context))) {
if (remote.isInterface()) {
// create the remote proxy for this interface
ClassStructureBuilder<?> remoteProxy = new JaxrsProxyGenerator(remote).generate();
loadProxies.append(new InnerClass((BuildMetaClass) remoteProxy.getClassDefinition()));
loadProxies.append(Stmt.invokeStatic(RemoteServiceProxyFactory.class, "addRemoteProxy",
remote, Stmt.newObject(remoteProxy.getClassDefinition())));
}
}
classBuilder = (ClassStructureBuilder<?>) loadProxies.finish();
String out = classBuilder.toJavaString();
if (Boolean.getBoolean("errai.codegen.printOut")) {
System.out.println("---JAX-RS Proxy-->");
System.out.println(out);
System.out.println("<--JAX-RS Proxy---");
}
return out;
}
}