StringUtil.java

/**
 * 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.common.util;

/**
 * String functions.
 *
 */
public class StringUtil {

  /**
   * @param xml
   * @return XML-escaped string
   */
  public static String xmlEscape(String xml) {
    return xml
        .replaceAll("&", "&")
        .replaceAll("<", "<")
        .replaceAll(">", ">");
  }

  /**
   * Notice that this function only escape entity reference and not character reference.
   * @param xml
   * @return the unescaped xml string.
   */
  public static String xmlUnescape(String xml) {
    return  xml
        .replaceAll("<", "<")
        .replaceAll(">", ">")
        .replaceAll(""", "\"")
        .replaceAll("'", "'")
        .replaceAll("&", "&");
  }
}