| /* |
| * Copyright 2008 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.xml.client; |
| |
| import com.google.gwt.xml.client.impl.XMLParserImpl; |
| |
| import java.util.ArrayList; |
| import java.util.List; |
| |
| /** |
| * This class represents the client interface to XML parsing. |
| */ |
| public class XMLParser { |
| |
| private static final XMLParserImpl impl = XMLParserImpl.getInstance(); |
| |
| /** |
| * This method creates a new document, to be manipulated by the DOM API. |
| * |
| * @return the newly created document |
| */ |
| public static Document createDocument() { |
| return impl.createDocument(); |
| } |
| |
| /** |
| * This method parses a new document from the supplied string, throwing a |
| * <code>DOMParseException</code> if the parse fails. |
| * |
| * @param contents the String to be parsed into a <code>Document</code> |
| * @return the newly created <code>Document</code> |
| */ |
| public static Document parse(String contents) { |
| return impl.parse(contents); |
| } |
| |
| /** |
| * This method removes all <code>Text</code> nodes which are made up of only |
| * white space. |
| * |
| * @param n the node which is to have all of its whitespace descendents |
| * removed. |
| */ |
| public static void removeWhitespace(Node n) { |
| removeWhitespaceInner(n, null); |
| } |
| |
| /** |
| * This method determines whether the browser supports {@link CDATASection} |
| * as distinct entities from <code>Text</code> nodes. |
| * |
| * @return true if the browser supports {@link CDATASection}, otherwise |
| * <code>false</code>. |
| * @deprecated Always returns true |
| */ |
| @Deprecated |
| public static boolean supportsCDATASection() { |
| return true; |
| } |
| |
| /* |
| * The inner recursive method for removeWhitespace |
| */ |
| private static void removeWhitespaceInner(Node n, Node parent) { |
| // This n is removed from the parent if n is a whitespace node |
| if (parent != null && n instanceof Text && (!(n instanceof CDATASection))) { |
| Text t = (Text) n; |
| if (t.getData().matches("[ \t\n]*")) { |
| parent.removeChild(t); |
| } |
| } |
| if (n.hasChildNodes()) { |
| int length = n.getChildNodes().getLength(); |
| List<Node> toBeProcessed = new ArrayList<Node>(); |
| // We collect all the nodes to iterate as the child nodes will change |
| // upon removal |
| for (int i = 0; i < length; i++) { |
| toBeProcessed.add(n.getChildNodes().item(i)); |
| } |
| // This changes the child nodes, but the iterator of nodes never changes |
| // meaning that this is safe |
| for (Node childNode : toBeProcessed) { |
| removeWhitespaceInner(childNode, n); |
| } |
| } |
| } |
| |
| /** |
| * Not instantiable. |
| */ |
| private XMLParser() { |
| } |
| } |