content: /*
   * 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.apache.ambari.server.utils;
  
  
  import java.io.ByteArrayInputStream;
  
  import javax.xml.parsers.DocumentBuilder;
  import javax.xml.parsers.DocumentBuilderFactory;
  
  import org.apache.commons.lang.StringUtils;
  
  /**
   * Static Helper methods for XML processing.
   */
  public class XmlUtils {
  
    public static boolean isValidXml(String input) {
      boolean result = true;
      try {
        if (StringUtils.isBlank(input)) {
          result = false;
        } else {
          DocumentBuilderFactory dbFactory = DocumentBuilderFactory.newInstance();
          // skip dtd references
          dbFactory.setFeature("http://apache.org/xml/features/nonvalidating/load-external-dtd", false);
          DocumentBuilder dBuilder = dbFactory.newDocumentBuilder();
          dBuilder.parse(new ByteArrayInputStream(input.getBytes("UTF-8")));
        }
      } catch (Exception e) {
        result = false;
      }
      return result;
    }
  
  }
  