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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
   *
   *    https://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
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   *  specific language governing permissions and limitations
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   ****************************************************************/
  
  package org.apache.cayenne.velocity;
  
  import java.io.IOException;
  import java.io.Writer;
  
  import org.apache.cayenne.access.translator.ParameterBinding;
  import org.apache.velocity.context.InternalContextAdapter;
  
  /**
   * A custom Velocity directive to create a PreparedStatement parameter text for "&lt;&gt;?".
   * If null value is encountered, generated text will look like "IS NOT NULL". Usage in
   * Velocity template is "WHERE SOME_COLUMN #bindNotEqual($xyz)".
   * 
   * @since 1.1
   */
  public class BindNotEqualDirective extends BindDirective {
  
      @Override
      public String getName() {
          return "bindNotEqual";
      }
  
      @Override
      protected void render(
              InternalContextAdapter context,
              Writer writer,
              ParameterBinding binding) throws IOException {
  
          if (binding.getValue() != null) {
              bind(context, binding);
              writer.write("<> ?");
          }
          else {
              writer.write("IS NOT NULL");
          }
      }
  }
  