/**
* 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.editor.util;
import org.waveprotocol.wave.client.editor.content.ContentElement;
import org.waveprotocol.wave.client.editor.content.ContentNode;
import org.waveprotocol.wave.model.util.Preconditions;
/**
* Document helper utilities that have some GWT dependency.
*
* @author danilatos@google.com (Daniel Danilatos)
*/
public class EditorDocHelper {
/**
* @param node
* @param tagName
* @return true if node is an element with tag name equal to the given one
*/
public static boolean isNamedElement(ContentNode node, String tagName) {
assert node != null;
return !node.isTextNode() && ((ContentElement) node).getTagName().equals(tagName);
}
/**
* Preconditions-style check to ensure a node is an element of a given tag
* name
*
* @param node
* @param tagName
* @param context debugging context (e.g. a method name). avoid runtime string
* computation.
*/
public static void checkNamedElement(ContentNode node, String tagName, String context) {
if (!isNamedElement(node, tagName)) {
Preconditions.illegalArgument(
context + ": expected element '" + tagName + "', got " +
(node.isTextNode() ? "a text node" : "element '" + node.asElement().getTagName() + "'"));
}
}
}