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.solr.response;
  
  import java.io.Writer;
  import java.io.IOException;
  
  import org.apache.solr.common.util.NamedList;
  import org.apache.solr.request.SolrQueryRequest;
  
  public class RubyResponseWriter implements QueryResponseWriter {
    static String CONTENT_TYPE_RUBY_UTF8="text/x-ruby;charset=UTF-8";
  
    public void init(NamedList n) {
      /* NOOP */
    }
    
   public void write(Writer writer, SolrQueryRequest req, SolrQueryResponse rsp) throws IOException {
      RubyWriter w = new RubyWriter(writer, req, rsp);
      try {
        w.writeResponse();
      } finally {
        w.close();
      }
    }
  
    public String getContentType(SolrQueryRequest request, SolrQueryResponse response) {
      return CONTENT_TYPE_TEXT_UTF8;
    }
  }
  
  class RubyWriter extends NaNFloatWriter {
  
    @Override
    protected String getNaN() { return "(0.0/0.0)"; }
    @Override
    protected String getInf() { return "(1.0/0.0)"; }
  
    public RubyWriter(Writer writer, SolrQueryRequest req, SolrQueryResponse rsp) {
      super(writer, req, rsp);
    }
  
    @Override
    public void writeNull(String name) throws IOException {
      writer.write("nil");
    }
  
    @Override
    protected void writeKey(String fname, boolean needsEscaping) throws IOException {
      writeStr(null, fname, needsEscaping);
      writer.write('=');
      writer.write('>');
    }
  
    @Override
    public void writeStr(String name, String val, boolean needsEscaping) throws IOException {
      // Ruby doesn't do unicode escapes... so let the servlet container write raw UTF-8
      // bytes into the string.
      //
      // Use single quoted strings for safety since no evaluation is done within them.
      // Also, there are very few escapes recognized in a single quoted string, so
      // only escape the backslash and single quote.
      writer.write('\'');
      if (needsEscaping) {
        for (int i=0; i<val.length(); i++) {
          char ch = val.charAt(i);
          if (ch=='\'' || ch=='\\') {
            writer.write('\\');
          }
          writer.write(ch);
        }
      } else {
        writer.write(val);
      }
      writer.write('\'');
    }
  }
  