/**
* Licensed to the Apache Software Foundation (ASF) under one
* or more contributor license agreements. See the NOTICE file
* distributed with this work for additional information
* regarding copyright ownership. The ASF licenses this file
* to you 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);
}
};
}
}
}