/***
* Copyright (c) 2009 Caelum - www.caelum.com.br/opensource
* All rights reserved.
*
* 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 br.com.caelum.vraptor.view;
import java.lang.reflect.Method;
import java.util.Arrays;
import java.util.List;
import javax.enterprise.inject.Vetoed;
import javax.servlet.ServletContext;
import net.vidageek.mirror.dsl.Mirror;
import br.com.caelum.vraptor.http.route.Router;
@Vetoed
public class Linker {
private final Router router;
private final ServletContext context;
private final List<Object> args;
private final String methodName;
private final Class<?> controller;
public Linker(ServletContext context, Router router, Class<?> controller, String methodName, List<Object> args) {
this.router = router;
this.context = context;
this.controller = controller;
this.methodName = methodName;
this.args = args;
}
protected String getLink() {
Method method = getMethod();
return getPrefix() + router.urlFor(controller, method, getArgs(method));
}
protected String getPrefix() {
return context.getContextPath();
}
protected Method getMethod() {
Method method = null;
if (countMethodsWithSameName() > 1) {
method = new Mirror().on(controller).reflect().method(methodName).withArgs(getClasses(args));
if (method == null && args.isEmpty()) {
throw new IllegalArgumentException("Ambiguous method '" + methodName + "' on " + controller + ". Try to add some parameters to resolve ambiguity, or use different method names.");
}
} else {
method = findMethodWithName(controller, methodName);
}
if(method == null) {
throw new IllegalArgumentException(
String.format("There are no methods on %s named '%s' that receives args of types %s",
controller, methodName, Arrays.toString(getClasses(args))));
}
return method;
}
protected Object[] getArgs(Method method) {
int methodArity = method.getParameterTypes().length;
if (args.size() == methodArity) {
return args.toArray();
}
if (args.size() > methodArity) {
throw new IllegalArgumentException(String.format("linkTo param args must have the same or lower length as method param args. linkTo args: %d | method args: %d", args.size(), methodArity));
}
Object[] noMissingParamsArgs = new Object[methodArity];
System.arraycopy(args.toArray(), 0, noMissingParamsArgs, 0, args.size());
return noMissingParamsArgs;
}
protected Method findMethodWithName(Class<?> type, String name) {
for (Method method : type.getDeclaredMethods()) {
if (!method.isBridge() && method.getName().equals(name)) {
return method;
}
}
if (type.getSuperclass().equals(Object.class)) {
return null;
}
return findMethodWithName(type.getSuperclass(), name);
}
protected int countMethodsWithSameName() {
int amount = 0;
for (Method method : controller.getDeclaredMethods()) {
if (!method.isBridge() && method.getName().equals(methodName)) {
amount++;
}
}
return amount;
}
protected Class<?>[] getClasses(List<Object> params) {
Class<?>[] classes = new Class<?>[params.size()];
for(int i = 0; i < params.size(); i ++) {
classes[i] = params.get(i).getClass();
}
return classes;
}
}