/*
* 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 static org.jboss.errai.enterprise.rebind.TypeMarshaller.demarshal;
import static org.jboss.errai.enterprise.rebind.TypeMarshaller.marshal;
import java.util.ArrayList;
import java.util.List;
import org.jboss.errai.bus.client.api.interceptor.InterceptedCall;
import org.jboss.errai.bus.client.framework.CallContextStatus;
import org.jboss.errai.bus.rebind.RPCProxyUtil;
import org.jboss.errai.codegen.BlockStatement;
import org.jboss.errai.codegen.BooleanOperator;
import org.jboss.errai.codegen.DefParameters;
import org.jboss.errai.codegen.Parameter;
import org.jboss.errai.codegen.Statement;
import org.jboss.errai.codegen.StringStatement;
import org.jboss.errai.codegen.Variable;
import org.jboss.errai.codegen.builder.BlockBuilder;
import org.jboss.errai.codegen.builder.ClassStructureBuilder;
import org.jboss.errai.codegen.builder.ContextualStatementBuilder;
import org.jboss.errai.codegen.meta.MetaClass;
import org.jboss.errai.codegen.meta.MetaClassFactory;
import org.jboss.errai.codegen.util.Bool;
import org.jboss.errai.codegen.util.If;
import org.jboss.errai.codegen.util.Stmt;
import org.jboss.errai.config.rebind.RebindUtils;
import org.jboss.errai.enterprise.client.jaxrs.api.ResponseCallback;
import org.jboss.errai.enterprise.client.jaxrs.api.ResponseException;
import org.jboss.errai.enterprise.client.jaxrs.api.interceptor.RestCallContext;
import com.google.gwt.http.client.Request;
import com.google.gwt.http.client.RequestBuilder;
import com.google.gwt.http.client.RequestCallback;
import com.google.gwt.http.client.RequestException;
import com.google.gwt.http.client.Response;
import com.google.gwt.http.client.URL;
import com.google.gwt.user.client.Cookies;
/**
* Generates a JAX-RS remote proxy method.
*
* @author Christian Sadilek <csadilek@redhat.com>
*/
public class JaxrsProxyMethodGenerator {
private static final String APPEND = "append";
private final MetaClass declaringClass;
private final JaxrsResourceMethod resourceMethod;
private final BlockBuilder<?> methodBlock;
private final List<Statement> parameters;
public JaxrsProxyMethodGenerator(ClassStructureBuilder<?> classBuilder, JaxrsResourceMethod resourceMethod) {
this.declaringClass = classBuilder.getClassDefinition();
this.resourceMethod = resourceMethod;
Parameter[] parms = DefParameters.from(resourceMethod.getMethod()).getParameters().toArray(new Parameter[0]);
Parameter[] finalParms = new Parameter[parms.length];
parameters = new ArrayList<Statement>();
for (int i = 0; i < parms.length; i++) {
finalParms[i] = Parameter.of(parms[i].getType(), parms[i].getName(), true);
parameters.add(Stmt.loadVariable(parms[i].getName()));
}
this.methodBlock = classBuilder.publicMethod(resourceMethod.getMethod().getReturnType(),
resourceMethod.getMethod().getName(), finalParms);
}
public void generate() {
if (resourceMethod.getHttpMethod() != null) {
JaxrsResourceMethodParameters jaxrsParams = resourceMethod.getParameters();
methodBlock.append(generateUrl(jaxrsParams));
methodBlock.append(generateRequestBuilder(jaxrsParams));
methodBlock.append(generateHeaders(jaxrsParams));
if (resourceMethod.getMethod().isAnnotationPresent(InterceptedCall.class) ||
resourceMethod.getMethod().getDeclaringClass().isAnnotationPresent(InterceptedCall.class)) {
methodBlock.append(generateInterceptorLogic());
}
else {
methodBlock.append(generateRequest());
}
}
generateReturnStatement();
}
private Statement generateUrl(JaxrsResourceMethodParameters params) {
BlockStatement block = new BlockStatement();
block.addStatement(Stmt.declareVariable("url", StringBuilder.class,
Stmt.newObject(StringBuilder.class, new StringStatement("getBaseUrl()"))));
// construct path using @PathParams and @MatrixParams
String path = resourceMethod.getPath();
ContextualStatementBuilder pathValue = Stmt.loadLiteral(path);
for (String pathParamName : JaxrsResourceMethodParameters.getPathParameterNames(path)) {
Statement pathParam = marshal(params.getPathParameter(pathParamName));
if (params.needsEncoding(pathParamName)) {
pathParam = encodePath(pathParam);
}
pathValue = pathValue.invoke("replace", "{" + pathParamName + "}", pathParam);
}
if (params.getMatrixParameters() != null) {
for (String matrixParamName : params.getMatrixParameters().keySet()) {
pathValue = pathValue.invoke("concat", ";" + matrixParamName + "=")
.invoke("concat", encodePath(marshal(params.getMatrixParameter(matrixParamName))));
}
}
ContextualStatementBuilder urlBuilder = Stmt.loadVariable("url").invoke(APPEND, pathValue);
// construct query using @QueryParams
if (params.getQueryParameters() != null) {
urlBuilder = urlBuilder.invoke(APPEND, "?");
int i = 0;
for (String queryParamName : params.getQueryParameters().keySet()) {
for (Statement queryParam : params.getQueryParameters(queryParamName)) {
if (i++ > 0)
urlBuilder = urlBuilder.invoke(APPEND, "&");
urlBuilder = urlBuilder.invoke(APPEND, queryParamName).invoke(APPEND, "=")
.invoke(APPEND, encodeQuery(marshal(queryParam)));
}
}
}
if (urlBuilder != null)
block.addStatement(urlBuilder);
return block;
}
private Statement generateRequestBuilder(JaxrsResourceMethodParameters params) {
Statement requestBuilder =
Stmt.declareVariable("requestBuilder", RequestBuilder.class,
Stmt.newObject(RequestBuilder.class)
.withParameters(resourceMethod.getHttpMethod(), Stmt.loadVariable("url").invoke("toString")));
return requestBuilder;
}
private Statement generateHeaders(JaxrsResourceMethodParameters params) {
BlockStatement block = new BlockStatement();
// set headers based on method and class
for (String key : resourceMethod.getHeaders().keySet()) {
block.addStatement(Stmt.loadVariable("requestBuilder").invoke("setHeader", key,
resourceMethod.getHeaders().get(key)));
}
// set headers based on @HeaderParams
if (params.getHeaderParameters() != null) {
for (String headerParamName : params.getHeaderParameters().keySet()) {
ContextualStatementBuilder headerValueBuilder = Stmt.nestedCall(Stmt.newObject(StringBuilder.class));
int i = 0;
for (Statement headerParam : params.getHeaderParameters(headerParamName)) {
if (i++ > 0) {
headerValueBuilder = headerValueBuilder.invoke(APPEND, ",");
}
headerValueBuilder = headerValueBuilder.invoke(APPEND, marshal(headerParam));
}
block.addStatement(Stmt.loadVariable("requestBuilder").invoke("setHeader", headerParamName,
headerValueBuilder.invoke("toString")));
}
}
// set cookies based on @CookieParams
if (params.getCookieParameters() != null) {
for (String cookieName : params.getCookieParameters().keySet()) {
Statement cookieParam = params.getCookieParameters().get(cookieName).get(0);
ContextualStatementBuilder setCookie = (cookieParam instanceof Parameter) ?
Stmt.loadVariable(((Parameter) cookieParam).getName()) :
Stmt.nestedCall(cookieParam);
setCookie.if_(BooleanOperator.NotEquals, null)
.append(Stmt.invokeStatic(Cookies.class, "setCookie", cookieName, marshal(cookieParam)))
.finish();
block.addStatement(setCookie);
}
}
return block.isEmpty() ? null : block;
}
private Statement generateInterceptorLogic() {
JaxrsResourceMethodParameters jaxrsParams =
JaxrsResourceMethodParameters.fromMethod(resourceMethod.getMethod(), "parameters");
InterceptedCall interceptedCall = resourceMethod.getMethod().getAnnotation(InterceptedCall.class);
if (interceptedCall == null) {
interceptedCall = resourceMethod.getMethod().getDeclaringClass().getAnnotation(InterceptedCall.class);
}
Statement callContext =
RPCProxyUtil.generateProxyMethodCallContext(RestCallContext.class, declaringClass,
resourceMethod.getMethod(), generateInterceptedRequest(), interceptedCall)
.publicOverridesMethod("setParameters", Parameter.of(Object[].class, "parameters"))
.append(new StringStatement("super.setParameters(parameters)"))
.append(generateUrl(jaxrsParams))
.append(generateRequestBuilder(jaxrsParams))
.append(generateHeaders(jaxrsParams))
.append(new StringStatement("setRequestBuilder(requestBuilder)"))
.finish()
.finish();
return Stmt.try_()
.append(
Stmt.declareVariable(CallContextStatus.class).asFinal().named("status").initializeWith(
Stmt.newObject(CallContextStatus.class).withParameters((Object[]) interceptedCall.value())))
.append(
Stmt.declareVariable(RestCallContext.class).asFinal().named("callContext")
.initializeWith(callContext))
.append(
Stmt.loadVariable("callContext").invoke("setRequestBuilder", Variable.get("requestBuilder")))
.append(
Stmt.loadVariable("callContext").invoke("setParameters",
Stmt.newArray(Object.class).initialize(parameters.toArray())))
.append(
Stmt.loadVariable("callContext").invoke("proceed"))
.finish()
.catch_(Throwable.class, "throwable")
.append(errorHandling())
.finish();
}
private Statement generateInterceptedRequest() {
return generateRequest(Stmt.nestedCall(
new StringStatement("getRequestBuilder()", MetaClassFactory.get(RequestBuilder.class))));
}
private Statement generateRequest() {
return generateRequest(Stmt.loadVariable("requestBuilder"));
}
private Statement generateRequest(ContextualStatementBuilder requestBuilder) {
if (resourceMethod.getParameters().getEntityParameter() == null) {
requestBuilder = requestBuilder.invoke("sendRequest", null, createRequestCallback());
}
else {
Statement body = marshal(resourceMethod.getParameters().getEntityParameter(),
resourceMethod.getContentTypeHeader());
requestBuilder = requestBuilder.invoke("sendRequest", body, createRequestCallback());
}
return Stmt
.try_()
.append(requestBuilder)
.finish()
.catch_(RequestException.class, "throwable")
.append(errorHandling())
.finish();
}
private Statement createRequestCallback() {
Statement statusCode = Stmt.loadVariable("response").invoke("getStatusCode");
Statement requestCallback =
Stmt
.newObject(RequestCallback.class)
.extend()
.publicOverridesMethod("onError", Parameter.of(Request.class, "request"),
Parameter.of(Throwable.class, "throwable"))
.append(errorHandling())
.finish()
.publicOverridesMethod("onResponseReceived", Parameter.of(Request.class, "request"),
Parameter.of(Response.class, "response"))
.append(
Stmt.if_(
Bool.and(
Bool.or(
Bool.isNull(Stmt.loadStatic(declaringClass, "this").loadField("successCodes")),
Stmt.loadStatic(declaringClass, "this").loadField("successCodes").invoke("contains",
statusCode)
),
Bool.and(
Bool.greaterThanOrEqual(statusCode, 200),
Bool.lessThan(statusCode, 300))
)
)
.append(responseHandling())
.finish()
.else_()
.append(Stmt.declareVariable("throwable", ResponseException.class,
Stmt.newObject(ResponseException.class).withParameters(
Stmt.loadVariable("response").invoke("getStatusText"), Variable.get("response"))))
.append(responseErrorHandling())
.finish())
.finish()
.finish();
return requestCallback;
}
private Statement errorHandling() {
return Stmt.loadStatic(declaringClass, "this").invoke("handleError", Variable.get("throwable"), null);
}
private Statement responseErrorHandling() {
return Stmt.loadStatic(declaringClass, "this")
.invoke("handleError", Variable.get("throwable"), Variable.get("response"));
}
private Statement responseHandling() {
Statement handleResponse = Stmt.loadStatic(declaringClass, "this").loadField("remoteCallback")
.invoke("callback", Stmt.loadVariable("response"));
Statement result = null;
if (resourceMethod.getMethod().getReturnType().equals(MetaClassFactory.get(void.class))) {
result = Stmt.load(null);
}
else {
result = demarshal(resourceMethod.getMethod().getReturnType(),
Stmt.loadVariable("response").invoke("getText"), resourceMethod.getAcceptHeader());
}
Statement handleResult =
If.idEquals(Stmt.loadVariable("response").invoke("getStatusCode"), 204)
.append(
Stmt.loadStatic(declaringClass, "this").loadField("remoteCallback").invoke("callback", Stmt.load(null)))
.finish()
.else_()
.append(Stmt.loadStatic(declaringClass, "this").loadField("remoteCallback").invoke("callback", result))
.finish();
return
If.instanceOf(Stmt.loadStatic(declaringClass, "this").loadField("remoteCallback"), ResponseCallback.class)
.append(handleResponse)
.finish()
.else_()
.append(handleResult)
.finish();
}
private Statement encodePath(Statement s) {
return Stmt.invokeStatic(URL.class, "encodePathSegment", s);
}
private Statement encodeQuery(Statement s) {
return Stmt.invokeStatic(URL.class, "encodeQueryString", s);
}
private void generateReturnStatement() {
Statement returnStatement = RebindUtils.generateProxyMethodReturnStatement(resourceMethod.getMethod());
if (returnStatement != null) {
methodBlock.append(returnStatement);
}
methodBlock.finish();
}
}