code: /*
   * 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.predictionio.workflow;
  
  import com.google.gson.Gson;
  import com.google.gson.TypeAdapter;
  import com.google.gson.TypeAdapterFactory;
  import com.google.gson.reflect.TypeToken;
  import com.google.gson.stream.JsonReader;
  import com.google.gson.stream.JsonToken;
  import com.google.gson.stream.JsonWriter;
  
  import java.io.IOException;
  
  public class JavaQueryTypeAdapterFactory implements TypeAdapterFactory {
      @Override
      public <T> TypeAdapter<T> create(Gson gson, TypeToken<T> type) {
          if (type.getRawType().equals(JavaQuery.class)) {
              return (TypeAdapter<T>) new TypeAdapter<JavaQuery>() {
                  public void write(JsonWriter out, JavaQuery value) throws IOException {
                      if (value == null) {
                          out.nullValue();
                      } else {
                          out.beginObject();
                          out.name("q").value(value.getQ().toUpperCase());
                          out.endObject();
                      }
                  }
  
                  public JavaQuery read(JsonReader reader) throws IOException {
                      if (reader.peek() == JsonToken.NULL) {
                          reader.nextNull();
                          return null;
                      } else {
                          reader.beginObject();
                          reader.nextName();
                          String q = reader.nextString();
                          reader.endObject();
                          return new JavaQuery(q.toUpperCase());
                      }
                  }
              };
          } else {
              return null;
          }
      }
  }
  