com.google.gwt.xml.client.XMLParser Maven / Gradle / Ivy
/*
* 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
* DOMParseException if the parse fails.
*
* @param contents the String to be parsed into a Document
* @return the newly created Document
*/
public static Document parse(String contents) {
return impl.parse(contents);
}
/**
* This method removes all Text 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 Text nodes.
*
* @return true if the browser supports {@link CDATASection}, otherwise
* false.
*/
public static boolean supportsCDATASection() {
return impl.supportsCDATASection();
}
/*
* 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 toBeProcessed = new ArrayList();
// 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() {
}
}