/**
* Copyright 2010 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 org.waveprotocol.wave.client.uibuilder;
import org.waveprotocol.wave.client.common.safehtml.SafeHtml;
import org.waveprotocol.wave.client.common.safehtml.SafeHtmlBuilder;
/**
* A closure that outputs HTML rooted at a single element.
*
*/
public interface UiBuilder extends HtmlClosure {
/**
* {@inheritDoc}
*
* The output HTML has a single top-level element.
*/
@Override
void outputHtml(SafeHtmlBuilder out);
/** An empty UI builder that outputs nothing. */
UiBuilder EMPTY = new UiBuilder() {
@Override
public void outputHtml(SafeHtmlBuilder out) {
}
};
/**
* A UI builder that outputs a constant html string.
*/
final class Constant {
// Utility class
private Constant() {
}
public static UiBuilder of(final SafeHtml html) {
return new UiBuilder() {
@Override
public void outputHtml(SafeHtmlBuilder out) {
out.append(html);
}
};
}
}
}