/*
    *    Copyright 2012-2022 the original author or authors.
    *
    *    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
    *
    *       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 KIND, either express or implied.
   *    See the License for the specific language governing permissions and
   *    limitations under the License.
   */
  package org.mybatis.scripting.velocity;
  
  import java.io.IOException;
  import java.io.StringWriter;
  
  import org.apache.velocity.context.InternalContextAdapter;
  import org.apache.velocity.runtime.parser.node.ASTBlock;
  import org.apache.velocity.runtime.parser.node.Node;
  
  public class WhereDirective extends TrimDirective {
  
    @Override
    public String getName() {
      return "where";
    }
  
    @Override
    protected Params getParams(InternalContextAdapter context, Node node) throws IOException {
      final Params params = new Params();
      params.setPrefix("WHERE");
      params.setPrefixOverrides("AND |OR |AND\n|OR\n|AND\r|OR\r");
      if (node.jjtGetNumChildren() == 1) {
        final Node child = node.jjtGetChild(0);
        if (child instanceof ASTBlock) {
          StringWriter blockContent = new StringWriter();
          child.render(context, blockContent);
          params.setBody(blockContent.toString().trim());
          return params;
        }
      }
      return null;
    }
  
  }