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Apache Geode provides a database-like consistency model, reliable transaction processing and a shared-nothing architecture to maintain very low latency performance with high concurrency processing
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/*
 * 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.geode.internal.cache.xmlcache;

import javax.xml.XMLConstants;

import org.xml.sax.Attributes;
import org.xml.sax.ContentHandler;
import org.xml.sax.SAXException;
import org.xml.sax.helpers.AttributesImpl;

/**
 * Utilities for use in {@link XmlGenerator} implementation to provide common helper methods.
 * 
 *
 * @since GemFire 8.1
 */
// UnitTest XmlGeneratorUtilsTest
public final class XmlGeneratorUtils {

  private XmlGeneratorUtils() {
    // statics only
  }

  /**
   * Adds attribute with localName to attributes if value is not null.
   * Follows the same rules as
   * {@link AttributesImpl#addAttribute(String, String, String, String, String)} .
   * 
   * @param attributes to add to.
   * @param localName of attribute to add.
   * @param value to add to attribute.
   * @since GemFire 8.1
   */
  static public void addAttribute(final AttributesImpl attributes, final String localName,
      final Object value) {
    if (null != value) {
      attributes.addAttribute(XMLConstants.NULL_NS_URI, localName, localName, "", value.toString());
    }
  }

  /**
   * Adds attribute with prefix and localName to attributes
   * if value is not null. Follows the same rules as
   * {@link AttributesImpl#addAttribute(String, String, String, String, String)} .
   * 
   * @param attributes to add to.
   * @param prefix of the attribute.
   * @param localName of attribute to add.
   * @param value to add to attribute.
   * @since GemFire 8.1
   */
  static public void addAttribute(final AttributesImpl attributes, final String prefix,
      final String localName, final Object value) {
    if (null != value) {
      attributes.addAttribute(XMLConstants.NULL_NS_URI, localName, prefix + ":" + localName, "",
          value.toString());
    }
  }

  /**
   * Start new element on contentHandler with given prefix,
   * localName and attributes.
   * 
   * @param contentHandler to start element on.
   * @param prefix of element
   * @param localName of element
   * @param attributes of element
   * @throws SAXException if {@link ContentHandler#startElement(String, String, String, Attributes)}
   *         throws {@link SAXException}.
   * @since GemFire 8.1
   */
  static public void startElement(final ContentHandler contentHandler, final String prefix,
      final String localName, final AttributesImpl attributes) throws SAXException {
    contentHandler.startElement(XMLConstants.NULL_NS_URI, localName, prefix + ":" + localName,
        attributes);
  }

  /**
   * End element on contentHandler with given prefix and
   * localName.
   * 
   * @param contentHandler to start element on.
   * @param prefix of element
   * @param localName of element
   * @throws SAXException if {@link ContentHandler#endElement(String, String, String)} throws
   *         {@link SAXException}.
   * @since GemFire 8.1
   */
  static public void endElement(final ContentHandler contentHandler, final String prefix,
      final String localName) throws SAXException {
    contentHandler.endElement(XMLConstants.NULL_NS_URI, localName, prefix + ":" + localName);
  }

  /**
   * Creates new empty element on contentHandler with given prefix,
   * localName and attributes.
   * 
   * @param contentHandler to create empty element on.
   * @param prefix of element
   * @param localName of element
   * @param attributes of element
   * @throws SAXException if {@link ContentHandler#startElement(String, String, String, Attributes)}
   *         or {@link ContentHandler#endElement(String, String, String)} throws
   *         {@link SAXException}.
   * @since GemFire 8.1
   */
  static public void emptyElement(final ContentHandler contentHandler, final String prefix,
      final String localName, final AttributesImpl attributes) throws SAXException {
    startElement(contentHandler, prefix, localName, attributes);
    endElement(contentHandler, prefix, localName);
  }

}