/*

  * 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.johnzon.core;

 import java.io.OutputStream;

 import java.io.OutputStreamWriter;

 import java.io.Serializable;

 import java.io.Writer;

 import java.nio.charset.Charset;

 import java.util.Collection;

 import java.util.Collections;

 import java.util.HashMap;

 import java.util.Map;

 import java.util.logging.Logger;

 import javax.json.JsonWriter;

 import javax.json.JsonWriterFactory;

 import javax.json.stream.JsonGenerator;

 import javax.json.stream.JsonGeneratorFactory;

 import static java.util.Arrays.asList;

 class JsonWriterFactoryImpl implements JsonWriterFactory, Serializable {

     private static final Logger LOGGER = Logger.getLogger(JsonWriterFactoryImpl.class.getName());

     private static final Charset UTF8_CHARSET = Charset.forName("UTF-8");

     private final Map<String, Object> internalConfig = new HashMap<String, Object>();

     private static final Collection<String> SUPPORTED_CONFIG_KEYS = asList(

         JsonGenerator.PRETTY_PRINTING

     );

     private final JsonGeneratorFactory factory;

     JsonWriterFactoryImpl(final Map<String, ?> config) {

         if (config != null) {

             for (final String configKey : config.keySet()) {

                 if (SUPPORTED_CONFIG_KEYS.contains(configKey)) {

                     internalConfig.put(configKey, config.get(configKey));

                 } else {

                     LOGGER.warning(configKey + " not supported by " + getClass().getName());

                 }

             }

             this.factory = new JsonGeneratorFactoryImpl(internalConfig);

         } else {

             this.factory = new JsonGeneratorFactoryImpl(null);

         }

     }

     @Override

     public JsonWriter createWriter(final Writer writer) {

         return new JsonWriterImpl(factory.createGenerator(writer));

     }

     @Override

     public JsonWriter createWriter(final OutputStream out) {

         return createWriter(new OutputStreamWriter(out, UTF8_CHARSET));

     }

     @Override

     public JsonWriter createWriter(final OutputStream out, final Charset charset) {

         return createWriter(new OutputStreamWriter(out, charset));

     }

     @Override

     public Map<String, ?> getConfigInUse() {

         return Collections.unmodifiableMap(internalConfig);

     }

 }