/**
* Copyright 2009 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.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() + "'"));
}
}
}