com.google.gwt.junit.FakeSafeHtmlTemplatesMaker Maven / Gradle / Ivy
/*
* Copyright 2013 Google 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 com.google.gwt.junit;
import com.google.gwt.safehtml.client.SafeHtmlTemplates;
import com.google.gwt.safehtml.shared.SafeHtml;
import com.google.gwt.safehtml.shared.SafeHtmlUtils;
import java.lang.reflect.InvocationHandler;
import java.lang.reflect.Method;
import java.lang.reflect.Proxy;
import java.util.Arrays;
/**
* Helper to make a fake implementation of any {@link SafeHtmlTemplates}
* interface via reflection, for use in JUnit tests. (This will not work in
* GWTTestCase.) All calls to the returned object return the method name
* followed by the passed parameters as a list surrounded by [].
*
* Sample use:
*
*
interface MyTemplates extends SafeHtmlTemplates {
* @Template("{0}: {2}")
* SafeHtml messageWithLink(SafeHtml message, String url, String linkText,
* String style);
* }
*
* public void testWithArgs() {
* MyTemplates templates = FakeSafeHtmlTemplatesMaker.create(MyTemplates.class);
* SafeHtml message = SafeHtmlUtils.fromString("message");
* assertEquals("messageWithLink[message, url, link, style]",
* templates.messageWithLink(message, "url", "link", "style").asString());
* }
*
*/
public class FakeSafeHtmlTemplatesMaker implements InvocationHandler {
public static T create(Class templatesClass) {
return templatesClass.cast(Proxy.newProxyInstance(
FakeSafeHtmlTemplatesMaker.class.getClassLoader(),
new Class[] {templatesClass},
new FakeSafeHtmlTemplatesMaker()));
}
public Object invoke(Object proxy, Method method, Object[] args)
throws Throwable {
String name = method.getName();
if (args == null || args.length == 0) {
return SafeHtmlUtils.fromString(name);
}
// SafeHtml does not implement toString(), so use asString() instead.
for (int i = 0; i < args.length; i++) {
if (args[i] instanceof SafeHtml) {
args[i] = ((SafeHtml) args[i]).asString();
}
}
String result = name + Arrays.asList(args);
return SafeHtmlUtils.fromString(result);
}
}